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     data   graph     files  public Float park phase data collected at depth in the Sargasso Sea from 2013-2014.    ?     I   M   background (external link) RSS BCO-DMO bcodmo_dataset_728335

The Dataset's Variables and Attributes

Row Type Variable Name Attribute Name Data Type Value
attribute NC_GLOBAL access_formats String .htmlTable,.csv,.json,.mat,.nc,.tsv,.esriCsv,.geoJson
attribute NC_GLOBAL acquisition_description String Multiple deployments of two Sea-Bird Scientific Navis BGCi floats (numbers
F033 and F034) equipped with CTDs, transmissometers, O2 optodes,
backscattering (700 nm), fluorescence (chlorophyll, colored dissolved organic
matter), and tilt sensors were conducted between July 2013 and November 2014
in conjunction with Bermuda Atlantic Time-series Study cruises. Short-term
deployments (1.5 \u2013 3 days) followed by recovery of the floats were
conducted during four monthly BATS cruises in July \u2013 October 2013 and one
cruise in March 2014. Both floats were deployed during the July and August
2013 cruises and float F034 was deployed for the remaining cruises. Each float
collected one profile per cruise with the exception of the August 2013 cruise,
during which the two floats together collected 13 profiles. During short-term
deployments, floats first completed an initial descent and ascent without
parking, then completed 1 or 2 more profile cycles with different, consecutive
target depths. Following the initial descent/ascent described above, the
short-term profile cycles were structured as described below for long-term
deployments. In addition to the short-term cruise deployments, F033 profiled
continuously from October 2013 until early April 2014, yielding 77 profiles,
and F034 profiled continuously from March 2014 until late November 2014,
yielding 139 profiles. During these long-term deployments, a typical cycle
consisted of 1) the descent to the target park depth, 2) a park phase at the
target depth lasting 1.5 \u2013 2.5 days during which measurements are made
every 15 minutes, 3) a descent to 1000 dbar, 4) an ascent to the surface
during which measurements are made, and 5) a surface telemetry phase, during
which a GPS fix is obtained, data are uploaded via Iridium, and instructions
for the next cycle are downloaded. During long-term deployments, floats cycled
through park phases at 150/200, 300, 500, and 1000 dbar every 7 days, spending
2.5 days at 1000 dbar and 1.5 days at the shallower depths. The sequence of
park phase depth at the three shallowest depths was varied between each 7-day
cycle over a 21-day period to avoid aliasing in particle flux profiles.

A float firmware error early in the project prevented collection of upper
water column data in some of the short-term deployments. This was remedied
before long-term deployment of the floats commenced. The floats occasionally
performed a reboot during ascent profiles. The affected profiles are missing
data for some pressure bins. Colored dissolved organic matter data are not
available for float F034 profiles from cruises B295 and B296 due to sensor
malfunction.

Park Data were acquired during the park phase at the target depth at a
sampling rate of 15 minutes.
attribute NC_GLOBAL awards_0_award_nid String 644826
attribute NC_GLOBAL awards_0_award_number String OCE-1406552
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=1406552 (external link)
attribute NC_GLOBAL awards_0_funder_name String NSF Division of Ocean Sciences
attribute NC_GLOBAL awards_0_funding_acronym String NSF OCE
attribute NC_GLOBAL awards_0_funding_source_nid String 355
attribute NC_GLOBAL awards_0_program_manager String Dr Henrietta N Edmonds
attribute NC_GLOBAL awards_0_program_manager_nid String 51517
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String Park Phase Data
M. Estapa and K. Buesseler, PIs
Version 17 April 2018
attribute NC_GLOBAL Conventions String COARDS, CF-1.6, ACDD-1.3
attribute NC_GLOBAL creator_email String info at bco-dmo.org
attribute NC_GLOBAL creator_name String BCO-DMO
attribute NC_GLOBAL creator_type String institution
attribute NC_GLOBAL creator_url String https://www.bco-dmo.org/ (external link)
attribute NC_GLOBAL data_source String extract_data_as_tsv version 2.2d 13 Jun 2019
attribute NC_GLOBAL date_created String 2018-02-26T20:19:34Z
attribute NC_GLOBAL date_modified String 2018-09-19T20:02:21Z
attribute NC_GLOBAL defaultDataQuery String &time
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.734334
attribute NC_GLOBAL Easternmost_Easting double -61.3763
attribute NC_GLOBAL geospatial_lat_max double 34.5731
attribute NC_GLOBAL geospatial_lat_min double 28.4094
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -61.3763
attribute NC_GLOBAL geospatial_lon_min double -69.025
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/728335 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String CTD Sea-Bird
attribute NC_GLOBAL instruments_0_dataset_instrument_description String Used for sampling
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 728342
attribute NC_GLOBAL instruments_0_description String Conductivity, Temperature, Depth (CTD) sensor package from SeaBird Electronics, no specific unit identified. This instrument designation is used when specific make and model are not known. See also other SeaBird instruments listed under CTD. More information from Sea-Bird Electronics.
attribute NC_GLOBAL instruments_0_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/130/ (external link)
attribute NC_GLOBAL instruments_0_instrument_name String CTD Sea-Bird
attribute NC_GLOBAL instruments_0_instrument_nid String 447
attribute NC_GLOBAL instruments_0_supplied_name String SBE 41CP CTD
attribute NC_GLOBAL instruments_1_acronym String Fluorometer
attribute NC_GLOBAL instruments_1_dataset_instrument_description String Used for sampling
attribute NC_GLOBAL instruments_1_dataset_instrument_nid String 733225
attribute NC_GLOBAL instruments_1_description String A fluorometer or fluorimeter is a device used to measure parameters of fluorescence: its intensity and wavelength distribution of emission spectrum after excitation by a certain spectrum of light. The instrument is designed to measure the amount of stimulated electromagnetic radiation produced by pulses of electromagnetic radiation emitted into a water sample or in situ.
attribute NC_GLOBAL instruments_1_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/113/ (external link)
attribute NC_GLOBAL instruments_1_instrument_name String Fluorometer
attribute NC_GLOBAL instruments_1_instrument_nid String 484
attribute NC_GLOBAL instruments_1_supplied_name String WET Labs MCOMS Chlorophyll Fluorometer
attribute NC_GLOBAL instruments_2_acronym String Transmissometer
attribute NC_GLOBAL instruments_2_dataset_instrument_description String Equipped on�Sea-Bird Scientific Navis BGCi floats (numbers F033 and F034)�
attribute NC_GLOBAL instruments_2_dataset_instrument_nid String 729419
attribute NC_GLOBAL instruments_2_description String A transmissometer measures the beam attenuation coefficient of the lightsource over the instrument's path-length. This instrument designation is used when specific manufacturer, make and model are not known.
attribute NC_GLOBAL instruments_2_instrument_external_identifier String https://vocab.nerc.ac.uk/collection/L05/current/124/ (external link)
attribute NC_GLOBAL instruments_2_instrument_name String Transmissometer
attribute NC_GLOBAL instruments_2_instrument_nid String 491
attribute NC_GLOBAL instruments_2_supplied_name String Transmissometers
attribute NC_GLOBAL instruments_3_acronym String Dissolved Oxygen Sensor
attribute NC_GLOBAL instruments_3_dataset_instrument_description String Used to sample dissolved oxygen,�Sea-Bird Scientific Navis BGCi floats (numbers F033 and F034)�
attribute NC_GLOBAL instruments_3_dataset_instrument_nid String 728343
attribute NC_GLOBAL instruments_3_description String An electronic device that measures the proportion of oxygen (O2) in the gas or liquid being analyzed
attribute NC_GLOBAL instruments_3_instrument_name String Dissolved Oxygen Sensor
attribute NC_GLOBAL instruments_3_instrument_nid String 705
attribute NC_GLOBAL instruments_3_supplied_name String O2 optode
attribute NC_GLOBAL instruments_4_acronym String OBS
attribute NC_GLOBAL instruments_4_dataset_instrument_description String Used to measure backscatter
attribute NC_GLOBAL instruments_4_dataset_instrument_nid String 733227
attribute NC_GLOBAL instruments_4_instrument_name String Optical Backscatter Sensor
attribute NC_GLOBAL instruments_4_instrument_nid String 686843
attribute NC_GLOBAL instruments_4_supplied_name String WET Labs MCOMS Scattering Meter
attribute NC_GLOBAL keywords String altimetry, azimuth, bbp, bbp700, bbp700_corr, bco, bco-dmo, beam, beam_c, biological, cal, cdom, chemical, chl, chl_cal, chl_corr, chlorophyll, chromophoric, color, colored, corr, counts, data, dataset, date, deployment, dissolved, dissolved o2, dmo, erddap, float, float_id, identifier, laboratory, latitude, longitude, management, material, matter, num, O2, ocean, ocean color, oceanography, office, optode, optode_temp, optode_therm_v, organic, oxy, oxy_phase, oxygen, oxygen_cal, phase, poc, POC_bbp, preliminary, pres, pressure, prof, prof_num, sal, satellite, temperature, therm, tilt, time, time2, trans, trans_counts, v
attribute NC_GLOBAL license String The data may be used and redistributed for free but is not intended
for legal use, since it may contain inaccuracies. Neither the data
Contributor, ERD, NOAA, nor the United States Government, nor any
of their employees or contractors, makes any warranty, express or
implied, including warranties of merchantability and fitness for a
particular purpose, or assumes any legal liability for the accuracy,
completeness, or usefulness, of this information.
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/728335 (external link)
attribute NC_GLOBAL Northernmost_Northing double 34.5731
attribute NC_GLOBAL param_mapping String {'728335': {'lat': 'master - latitude', 'lon': 'master - longitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/728335/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String Skidmore College
attribute NC_GLOBAL people_0_person_name String Dr Margaret L. Estapa
attribute NC_GLOBAL people_0_person_nid String 644830
attribute NC_GLOBAL people_0_role String Principal Investigator
attribute NC_GLOBAL people_0_role_type String originator
attribute NC_GLOBAL people_1_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_1_affiliation_acronym String WHOI
attribute NC_GLOBAL people_1_person_name String Dr Kenneth O. Buesseler
attribute NC_GLOBAL people_1_person_nid String 50522
attribute NC_GLOBAL people_1_role String Co-Principal Investigator
attribute NC_GLOBAL people_1_role_type String originator
attribute NC_GLOBAL people_2_affiliation String Skidmore College
attribute NC_GLOBAL people_2_person_name String Dr Margaret L. Estapa
attribute NC_GLOBAL people_2_person_nid String 644830
attribute NC_GLOBAL people_2_role String Contact
attribute NC_GLOBAL people_2_role_type String related
attribute NC_GLOBAL people_3_affiliation String Woods Hole Oceanographic Institution
attribute NC_GLOBAL people_3_affiliation_acronym String WHOI BCO-DMO
attribute NC_GLOBAL people_3_person_name String Hannah Ake
attribute NC_GLOBAL people_3_person_nid String 650173
attribute NC_GLOBAL people_3_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_3_role_type String related
attribute NC_GLOBAL project String Rapid, Autonomous Particle Flux Observations in the Oligotrophic Ocean
attribute NC_GLOBAL projects_0_acronym String RapAutParticleFlux
attribute NC_GLOBAL projects_0_description String Particles settling into the deep ocean remove carbon and biologically-important trace elements from sunlit, productive surface waters and from contact with the atmosphere over short timescales.�A shifting balance among physical, chemical, and biological processes determines the ultimate fate of most particles at depths between 100 and 1,000 m, where fluxes are hardest to measure.�Our challenge is to expand the number of particle flux observations in the critical "twilight zone", something that has proven elusive with ship-based “snapshots” that have lengths of, at most, a few weeks.�Here, we propose an optical, transmissometer-based method to make particle flux observations from autonomous, biogeochemical profiling floats.�Novel developments in data interpretation, sensor operation, and platform control now allow flux measurements at hourly resolution and give us observational access to the water-column processes driving particle flux over short timescales.�The sensors and float platforms that we propose to use are simple, robust, and commercially-available, making them immediately compatible with community-scale efforts to implement other float-based biogeochemical measurements.
We have two main goals:� First, we will quantify particulate organic carbon (POC) flux using float-based optical measurements by validating our observations against fluxes measured directly with neutrally-buoyant, drifting sediment traps. Second, we will evaluate the contribution of rapid export events to total POC fluxes in the oligotrophic ocean by using a biogeochemical profiling float to collect nearly-continuous, depth-resolved flux measurements and coupled, water-column bio-optical profiles.�
To achieve these goals, we will implement a work plan consisting of 1) a set of laboratory-based sensor calibration experiments to determine detection limits and evaluate sensitivity to particle size; 2) a series of four sediment trap and biogeochemical float co-deployments during which we will collect POC flux and field calibration data; and 3) a long-term sampling and analysis period (approximately 1 year) during which data will be returned by satellite from the biogeochemical float.�We will conduct calibration fieldwork in conjunction with monthly Bermuda Atlantic Time-series Study (BATS) cruises, taking advantage of the timeseries measurements and the context provided by the 25-year record of POC flux at that site.�The data returned by the float will comprise the first quantitative particle flux observations made at high-enough temporal resolution to interpret in the context of short-term, upper-ocean production events.
attribute NC_GLOBAL projects_0_end_date String 2014-11
attribute NC_GLOBAL projects_0_geolocation String Sargasso Sea
attribute NC_GLOBAL projects_0_name String Rapid, Autonomous Particle Flux Observations in the Oligotrophic Ocean
attribute NC_GLOBAL projects_0_project_nid String 644827
attribute NC_GLOBAL projects_0_start_date String 2013-07
attribute NC_GLOBAL publisher_name String Hannah Ake
attribute NC_GLOBAL publisher_role String BCO-DMO Data Manager(s)
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 28.4094
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v29
attribute NC_GLOBAL summary String Optical proxy measurements of sinking particle flux and water-column bio-optical profiles were obtained from profiling floats in the Sargasso Sea to expand the number of particle flux observations in the critical and under-sampled \u201ctwilight zone\u201d. Particulate organic carbon flux derived from float-based optical sediment trap measurements was validated against fluxes measured directly with co-deployed, drifting neutrally-buoyant, sediment traps during a series of five short cruises before floats were deployed for approximately one year. The data returned by the floats comprise quantitative particle flux observations made at high-enough temporal resolution to interpret in the context of short-term, upper-ocean production events.
attribute NC_GLOBAL title String Float park phase data collected at depth in the Sargasso Sea from 2013-2014.
attribute NC_GLOBAL version String 2
attribute NC_GLOBAL Westernmost_Easting double -69.025
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.5-beta
variable deployment   String  
attribute deployment description String For short-term deployments (1.5-3 days), the BATS cruise number from which the float was deployed. For long-term deployments, the serial number of the float (F033 or F034).
attribute deployment ioos_category String Unknown
attribute deployment long_name String Deployment
attribute deployment units String unitless
variable float_id   byte  
attribute float_id _FillValue byte 127
attribute float_id actual_range byte 33, 34
attribute float_id description String The serial number of the float (F033 or F034).
attribute float_id ioos_category String Identifier
attribute float_id long_name String Float Id
attribute float_id units String unitless
variable prof_num   short  
attribute prof_num _FillValue short 32767
attribute prof_num actual_range short 1, 139
attribute prof_num description String Number of float park cycle.
attribute prof_num ioos_category String Unknown
attribute prof_num long_name String Prof Num
attribute prof_num units String unitless
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 28.4094, 34.5731
attribute latitude axis String Y
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude description String Latitude
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude standard_name String latitude
attribute latitude units String degrees_north
variable longitude   double  
attribute longitude _CoordinateAxisType String Lon
attribute longitude _FillValue double NaN
attribute longitude actual_range double -69.025, -61.3763
attribute longitude axis String X
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude description String Longitude
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable date   String  
attribute date description String The UTC date of each 15-minute park phase observation; yyyy/mm/dd
attribute date ioos_category String Time
attribute date long_name String Date
attribute date source_name String date
attribute date units String unitless
variable time2   double  
attribute time2 _FillValue double NaN
attribute time2 actual_range double 9.26E-5, 0.999965278
attribute time2 description String The UTC time of each 15-minute park phase observation; HH:MM
attribute time2 ioos_category String Time
attribute time2 long_name String Time
attribute time2 units String unitless
variable pres   float  
attribute pres _FillValue float NaN
attribute pres actual_range float 0.6, 1113.6
attribute pres description String Pressure acquired with Sea-Bird Scientific SBE 41CP CTD. This is reported as the instrument output with the factory calibration applied.
attribute pres ioos_category String Pressure
attribute pres long_name String Pressure
attribute pres units String dbar
variable temp   float  
attribute temp _FillValue float NaN
attribute temp actual_range float 5.974, 22.686
attribute temp description String Temperature acquired with Sea-Bird Scientific SBE 41CP CTD. This is reported as the instrument output with the factory calibration applied.
attribute temp ioos_category String Temperature
attribute temp long_name String Temperature
attribute temp units String Celsius
variable sal   float  
attribute sal _FillValue float NaN
attribute sal actual_range float 21.718, 36.652
attribute sal description String Salinity acquired with Sea-Bird Scientific SBE 41CP CTD. This is reported as the instrument output with the factory calibration applied.
attribute sal ioos_category String Unknown
attribute sal long_name String Sal
attribute sal units String PSU
variable optode_therm_v   float  
attribute optode_therm_v _FillValue float NaN
attribute optode_therm_v actual_range float 0.59454, 1.00125
attribute optode_therm_v description String Oxygen sensor thermistor raw voltage; Acquired with Sea-Bird Scientific SBE 63 Optical Dissolved Oxygen Sensor. This is the raw sensor output.
attribute optode_therm_v ioos_category String Unknown
attribute optode_therm_v long_name String Optode Therm V
attribute optode_therm_v units String volts
variable optode_temp   float  
attribute optode_temp _FillValue float NaN
attribute optode_temp actual_range float 5.973, 22.684
attribute optode_temp description String Temperature at dissolved oxygen sensor; Acquired with Sea-Bird Scientific SBE 63 Optical Dissolved Oxygen Sensor. Temperature at the dissolved oxygen sensor was calculated from the raw SBE 63 thermistor voltage by applying the factory calibration:
L = ln (100000 * thermistor voltage / (3.3 - thermistor voltage)) Temperature [ deg C] = 1 / (TA0 + TA1*L + TA2*L2 + TA3*L3) - 273.15
See�https://www.bco-dmo.org/dataset/728371 for calibration coefficients.
attribute optode_temp ioos_category String Unknown
attribute optode_temp long_name String Optode Temp
attribute optode_temp units String Celsius
variable oxy_phase   float  
attribute oxy_phase _FillValue float NaN
attribute oxy_phase actual_range float 16.335, 23.606
attribute oxy_phase description String Oxygen sensor raw phase; Acquired with Sea-Bird Scientific SBE 63 Optical Dissolved Oxygen Sensor. This is the raw sensor output.
attribute oxy_phase ioos_category String Unknown
attribute oxy_phase long_name String Oxy Phase
attribute oxy_phase units String usec
variable oxygen   float  
attribute oxygen _FillValue float NaN
attribute oxygen actual_range float 145.6, 244.73
attribute oxygen description String Dissolved oxygen; Acquired with Sea-Bird Scientific SBE 63 Optical Dissolved Oxygen Sensor. Dissolved oxygen concentration [umol/kg] was calculated and corrected for salinity and pressure effects according to the 2016 Argo recommendations for processing of dissolved oxygen data (Thierry et al. 2016). As per these recommendations, an initial pressure correction was made to the raw measured oxygen phase delay Phi�[usec] according to Bittig et al. 2015:
����������������� Phi adj�= Phi raw�+ Pcoef1�* P / 1000
where Pcoef1�= 0.115 usec and P [dbar] is the collocated SBE 41CP CTD pressure measurement. The adjusted oxygen phase delay [usec] was then converted to voltage by applying the factory conversion:
����������������� V = Phiadj�/ 39.457071
Uncorrected dissolved oxygen concentration [mL/L] was calculated by applying the factory calibration:
����������������� Oxygen_uncorr [mL/L] = {(A0 + A1*T + A2*V2) / (B0 + B1*V) - 1.0} / (C0 + C1*T + C2*T2)
where T is SBE 63 temperature [deg C] and V is adjusted SBE 63 phase delay [V]. The oxygen calibration coefficients (A0, A1, A2, B0, B1, C0, C1, C2) are provided in Table 1. Dissolved oxygen concentration [mL/L] was then corrected for salinity and pressure effects according to the 2016 Argo recommendations.
����������������� Oxygen_corr [mL/L] = Oxygenun corr�[mL/L] * Scorr�* Pcorr
where
����������������� Scorr�= A(T,S,Spreset)�* exp(S*(SolB0�+ SolB1*Ts�+ SolB2*Ts2�+ SolB3*Ts3) + SolC0*S2)
����������������� A(T,S,Spreset)�= (1013.25 -�pH2O(T,Spreset)) / (1013.25 -�pH2O(T,S))
������������������pH2O = 1013.25 * exp(D0�+ D1*(100 / (T + 273.15)) + D2*ln((T + 273.15) / 100) + D3*S)
����������������� Spreset�= 0
����������������� TS�=�ln�[(298.15 - T) / (273.15 + T)]
T and S are the collocated temperature and salinity measurements from the SBE 41CP CTD, respectively. Salinity correction coefficients are from Benson and Krause 1984 (SolB0�= -6.24523e-3, SolB1�= -7.37614e-3, SolB2�= -1.03410e-3, SolB3�= -8.17083e-3, SolC0�= -4.88682e-7) and�pH2O coefficients are from Weiss and Price 1980 (D0�= 24.4543, D1�= -67.4509, D2�= -4.8489, D3�= -5.44e-4). The pressure correction factor Pcorr�is calculated as outlined in Bittig et al. 2015 as
����������������� Pcorr�= 1 + (Pcoef2�* T + Pcoef3) * P / 1000
with Pcoef2�= 0.00022 and Pcoef3�= 0.0419. Dissolved oxygen concentration [mL/L] was converted to dissolved oxygen concentration [umol/kg]:
����������������� Oxygen [umol/kg] = Oxygen [mL/L] * (44.6596 umol/mL) / (ρTheta/1000)
where ρθ�is the potential density of seawater [kg/m3] at zero pressure and the potential temperature calculated from collocated SBE 41CP CTD salinity, temperature, and pressure measurements using the pden function in the SEAWATER Matlab library (Morgan and Pender 1993). The value of 44.6596 umol/mL is derived from the molar volume of oxygen gas at standard temperature and pressure, 22.3916 L/mole (e.g., Garc�a and Gordon 1992).
See https://www.bco-dmo.org/dataset/728371 for calibration coefficients.
attribute oxygen ioos_category String Dissolved O2
attribute oxygen long_name String Oxygen
attribute oxygen units String umol/kg
variable oxygen_cal   float  
attribute oxygen_cal _FillValue float NaN
attribute oxygen_cal actual_range float 143.42, 245.83
attribute oxygen_cal description String Calibrated dissolved oxygen; The dissolved oxygen concentrations calculated above were corrected to dissolved oxygen concentrations measured by Winkler titration of bottle samples collected during concurrent Bermuda Atlantic Time-series Study cruises (available at https://www.bco-dmo.org/project/2124 or http://bats.bios.edu).
Linear regression yields the relationship:�
oxygen_cal [umol/kg] = oxygen [umol/kg] * 1.0331 – 6.9976; R2 = 0.97.�
See�https://www.bco-dmo.org/dataset/728371�for bottle calibration data.
attribute oxygen_cal ioos_category String Dissolved O2
attribute oxygen_cal long_name String Oxygen Cal
attribute oxygen_cal units String umol/kg
variable chl   float  
attribute chl _FillValue float NaN
attribute chl actual_range float -0.0199, 1.8106
attribute chl description String Chlorophyll-a; Acquired with WET Labs MCOMS Chlorophyll Fluorometer (excitation 470 nm/emission 695 nm). A dark offset was subtracted from the raw sensor counts and the result was multiplied by a factory-determined scale factor to obtain fluorometric chlorophyll-a concentration [ug/L]. The dark offset was computed separately for each sensor as the mean of the deep-water minima measured during all profiles between July and September 2013 at BATS (https://www.bco-dmo.org/dataset/728371).�Chl [ug/L] = Scale Factor * (Output - Dark Counts)
attribute chl ioos_category String Unknown
attribute chl long_name String CHL
attribute chl units String ug/L
variable chl_corr   float  
attribute chl_corr _FillValue float NaN
attribute chl_corr actual_range float -0.0255, 1.8047
attribute chl_corr description String Corrected chlorophyll-a; The fluorometric chlorophyll-a values derived above were further corrected by removing the deep-water dependence of chlorophyll fluorescence on fluorescent colored dissolved organic matter (CDOM; see below) and a small residual deep-water sensor offset. The method of Xing et al. (2017) was applied. Briefly chlorophyll fluorescence in deep water was assumed to originate entirely from a combination of the above factors the dependence of the measured chlorophyll fluorescence on CDOM was determined through linear regression and the regression parameters were used to correct the entire chlorophyll profile. Profiles shallower than 200 m were corrected using the regression parameters of the subsequent float profile.
attribute chl_corr ioos_category String Unknown
attribute chl_corr long_name String Chl Corr
attribute chl_corr units String ug/L
variable chl_cal   float  
attribute chl_cal _FillValue float NaN
attribute chl_cal actual_range float -0.0057, 0.8647
attribute chl_cal description String Calibrated chlorophyll-a; Corrected fluorometric chlorophyll-a concentrations (chl_corr derived above) were calibrated to chlorophyll-a concentrations measured by HPLC of bottle samples collected during concurrent Bermuda Atlantic Time-series Study cruises (available at https://www.bco-dmo.org/project/2124 or http://bats.bios.edu).
Linear regression yields the relationship:
chl_cal [�=ug/L] = chl [ug/L] * 0.4756 + 0.0064; R2 = 0.92.
See https://www.bco-dmo.org/dataset/728371 for bottle calibration data.
attribute chl_cal ioos_category String Unknown
attribute chl_cal long_name String Chl Cal
attribute chl_cal units String ug/L
variable bbp700   float  
attribute bbp700 _FillValue float NaN
attribute bbp700 actual_range float -2.22E-4, 0.052367
attribute bbp700 description String Particulate backscattering coefficient bbp (700nm); Acquired with WET Labs MCOMS Scattering Meter with 700-nm wavelength and in-water centroid angle of 150 deg. See Table 3 in paper.
The particulate volume scattering coefficient βp was calculated as
��������������� βp(150 deg,700 nm) [m-1 sr-1] = Scale Factor * (Output – Dark Counts)
using a factory-determined scale factor and a dark offset, computed separately for each sensor as the mean of the deep-water minima measured during all profiles between July and September 2013 at BATS (https://www.bco-dmo.org/dataset/728371). Particulate backscattering coefficient, bbp(λ) [m-1], is estimated as
��������������� bbp = 2πχβp(150 deg)
��������������� χ = 1.13 for 150 deg (from Boss and Pegau 2001).
attribute bbp700 ioos_category String Unknown
attribute bbp700 long_name String BBP700
attribute bbp700 units String m -1
variable bbp700_corr   float  
attribute bbp700_corr _FillValue float NaN
attribute bbp700_corr actual_range float -1.8E-5, 0.052572
attribute bbp700_corr description String Corrected particulate backscattering coefficient bbp (700nm); Depth profiles of particulate backscattering coefficient bbp(700 nm) were despiked using a running median filter (Briggs et al. 2011). Due to the size of the median filter window the initial and final six data points in each profile could not be despiked and appear as NaN. Park phase bbp(700 nm) data were not despiked because they were collected at a nominally constant depth. Despiked profile phase bbp(700 nm) and raw park phase bbp(700 nm) were further corrected by a float-specific deep-water offset. The minimum bbp(700 nm) measured during the long-term deployments was determined for each float (-2.0488e-04 m-1 for F033; -1.1139e-04 m-1 for F034) and subtracted from the bbp(700 nm) values derived above.
attribute bbp700_corr ioos_category String Unknown
attribute bbp700_corr long_name String Bbp700 Corr
attribute bbp700_corr units String m -1
variable POC_bbp   double  
attribute POC_bbp _FillValue double NaN
attribute POC_bbp actual_range double -0.2657, 1683.6505
attribute POC_bbp description String Particulate organic carbon derived from bbp (700 nm); The relationship between corrected bbp(700 nm) measured by the float backscatter sensor (bbp700_corr derived above) and POC concentrations measured in bottle samples collected during concurrent Bermuda Atlantic Time-series Study cruises (available at https://www.bco-dmo.org/project/2124 or http://bats.bios.edu) was utilized to predict POC concentration from corrected bbp(700 nm) for all float samples.
Linear regression yields the relationship:
POC [mg/m3] = bbp(700 nm) [m-1] * 32020.0874 + 0.2973; R2 = 0.86.
See�https://www.bco-dmo.org/dataset/728371 for bottle calibration data.
attribute POC_bbp ioos_category String Ocean Color
attribute POC_bbp long_name String POC Bbp
attribute POC_bbp units String mg/meters cubed
variable cdom   float  
attribute cdom _FillValue float NaN
attribute cdom actual_range float -0.4362, 1.8625
attribute cdom description String Colored dissolved organic matter; Acquired with WET Labs MCOMS CDOM Fluorometer (excitation 370 nm/emission 460 nm). A dark offset was subtracted from the raw sensor counts and the result was multiplied by a factory-determined scale factor to obtain colored dissolved organic matter concentration [ppb].
The dark offset was computed separately for each sensor as the mean of the surface minima (0 – 20 dbar) measured during all profiles between July and September 2013 at BATS (https://www.bco-dmo.org/dataset/728371).
attribute cdom ioos_category String Ocean Color
attribute cdom long_name String Chromophoric Dissolved Organic Material
attribute cdom units String ppb
variable trans_counts   short  
attribute trans_counts _FillValue short 32767
attribute trans_counts actual_range short 6590, 15664
attribute trans_counts description String Transmissometer raw counts; Acquired with WET Labs c-ROVER 2000 transmissometer with 650-nm wavelength and 0.25-m pathlength. This is reported as the raw sensor output in counts.
attribute trans_counts ioos_category String Unknown
attribute trans_counts long_name String Trans Counts
attribute trans_counts units String count
variable beam_c   float  
attribute beam_c _FillValue float NaN
attribute beam_c actual_range float -0.0113, 3.3804
attribute beam_c description String Uncorrected particulate beam attenuation coefficient cp (650 nm); Acquired with WET Labs c-ROVER 2000 transmissometer with 650-nm wavelength and 0.25-m pathlength.
Transmittance is calculated as:
��������������� Transmittance = (Signal - Dark) / (Cal Signal - Dark)
��������������� Signal = raw output in counts
��������������� Dark = counts with beam blocked, factory supplied
��������������� Cal Signal = counts with Milli-Q water in sensor path, acquired prior to deployment (https://www.bco-dmo.org/dataset/728371)
The beam attenuation coefficient is calculated as:
��������������� cp,uncorr(650 nm) = -ln (transmittance) / pathlength [m]
No correction for drift of the sensor over time (for instance, due to bio-fouling, see Estapa et al. 2013) has been applied.
attribute beam_c ioos_category String Unknown
attribute beam_c long_name String Beam C
attribute beam_c units String m -1
variable tilt   float  
attribute tilt _FillValue float NaN
attribute tilt actual_range float 0.1, 9.4
attribute tilt description String The maximum tilt value recorded during each sampling interval.
attribute tilt ioos_category String Unknown
attribute tilt long_name String Tilt
attribute tilt units String degrees
variable azimuth   short  
attribute azimuth _FillValue short 32767
attribute azimuth actual_range short 0, 360
attribute azimuth description String The uncalibrated compass heading of the float.
attribute azimuth ioos_category String Unknown
attribute azimuth long_name String Azimuth
attribute azimuth units String degrees

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