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Title Sum-
Institution Dataset ID
   set  data   graph     files  public CTD cast data from 45 R/V Alpha Helix and R/V Wecoma Long-Term Observation Program (LTOP)
cruises to the Coastal Gulf of Alaska from 1997-2004 as part of the U.S. GLOBEC program (NEP
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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 Progress Report: April 1999
Project Title: The Gulf of Alaska GLOBEC LTOP Program
Investigators: Thomas Weingartner (PI), A. J. Paul (PI), Ken Coyle (PI), Lew
Haldorson (PI), Dean Stockwell (PI), Terry Whitledge (PI), Jennifer Boldt,
Seth Danielson, Alexei Pinchuk, and Amy Ruehs (All at University of Alaska),
and Tom Royer (PI; Old Dominion Univ.)

The LTOP monitoring in the Gulf of Alaska completed its first year of sampling
which included week-long cruises using the Alpha Helix in October 1997, and
March, April, May, July, October, and December 1998. Sampling on all cruises
included occupying stations along the Seward Line, which extends from the
inner shelf to the edge of the continental slope. At each station CTD profiles
and water samples for nutrients, chlorophyll and zooplankton nauplii were
collected. Additional sampling includes MOCNESS tows at each of these stations
with the tow depths chosen on the basis of backscatter from a 4- frequency,
split-beam towed transducer array. The MOCNESS samples allow verification of
the acoustical results and provide samples for species identification and
additional analyses. The transducer is towed continually along the line and in
conjunction with underway measurements of sea surface temperature, salinity,
fluorescence and ADCP data provide data at very high spatial resolution. This
standard sampling was supplemented during the July and October cruises with
coincidental trawls from a charterd fishing vessel and surface gill nets from
the Alpha Helix. We have also provided samples and/or sampling opportunities
to other scientists for measurements of stable isotope composition of biota,
dissolved carbon, bacteria, microzooplankton, seabird and marine mammal, and

The data suggest that the shelf is organized into three distinct dynamic and
biological regimes. The innermost portion of the shelf consists of the Alaska
Coastal Current, which is a high speed, persistent, dilute coastal current
which is generally low in nutrients and chlorophyll. The inner shelf is
segregated from the midshelf region by a salinity front. Nutrient
concentrations, chlorophyll biomass, zooplankton, fish and seabird abundances
appear to be consistently high just offshore of this front. However, it is not
clear if this region of locally high biological productivity is associated
with frontal processes or with the locally complicated bathymetry and
coastline curvature. Over the midshelf region the circulation is weak and
variable and biological abundances appear to be patchy in time and space. This
region of the shelf often contains eddies having a diamter of ~50km. A third
regime straddles the shelfbreak salinity front. Flow here is also swift (and
often reflects shoreward movement of the Alaskan Stream) and nutrient,
chlorophyll and zooplankton conentrations tend to be relatively high. Fish,
seabird, and mammal abundances are also relatively high in this region. There
is some suggestion that the vertebrate community structure here differs from
that of the inner shelf.

Time permitting we augment the sampling along the Seward Line with additional
alongshore transects. While these are relatively few in number they suggest
that biological production is highly patchy owing perhaps to very complicated

The first year of sampling occurred during an El Nino year and the physical
effects of this phenomenom included unusually warm (~1-2C above normal) and
fresh (.15 psu) waters over the uper 200 m of the shelf. By summer, deep water
temperatures were returning to normal and deep water salinities were above
normal. The reason for the latter is not known but it implies either
abnormally high upwelling rates or changes in the the composition of the
offshore water masses that annually flow inshore. Higher salinities imply
higher nutrient concentrations. However, it is not clear that changes in deep
nutrient concentrations in the deep water on the shelf affect surface

Additional information about the GLOBEC LTOP in the Coastal Gulf of Alaska,
including plots of cruise results, station locations, etc., can be obtained
at: [http://www.ims.uaf.edu/GLOBEC/](\\"http://www.ims.uaf.edu/GLOBEC/\\")
attribute NC_GLOBAL awards_0_award_nid String 54767
attribute NC_GLOBAL awards_0_award_number String OCE-0109078
attribute NC_GLOBAL awards_0_data_url String http://www.nsf.gov/awardsearch/showAward.do?AwardNumber=0109078 (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 Phillip R. Taylor
attribute NC_GLOBAL awards_0_program_manager_nid String 50451
attribute NC_GLOBAL awards_1_award_nid String 55044
attribute NC_GLOBAL awards_1_award_number String unknown NEP NOAA
attribute NC_GLOBAL awards_1_funder_name String National Oceanic and Atmospheric Administration
attribute NC_GLOBAL awards_1_funding_acronym String NOAA
attribute NC_GLOBAL awards_1_funding_source_nid String 352
attribute NC_GLOBAL cdm_data_type String Other
attribute NC_GLOBAL comment String ctd_lev1 datafile: CTD_HX201.dat
ctd_lev2 datafile: CTD_HX201_1.dat
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 2.3 19 Dec 2019
attribute NC_GLOBAL date_created String 2009-11-29T11:22:08Z
attribute NC_GLOBAL date_modified String 2019-11-28T15:08:27Z
attribute NC_GLOBAL defaultDataQuery String &time<now
attribute NC_GLOBAL doi String 10.1575/1912/bco-dmo.2470.1
attribute NC_GLOBAL Easternmost_Easting double -143.6689
attribute NC_GLOBAL geospatial_lat_max double 61.2601
attribute NC_GLOBAL geospatial_lat_min double 57.7995
attribute NC_GLOBAL geospatial_lat_units String degrees_north
attribute NC_GLOBAL geospatial_lon_max double -143.6689
attribute NC_GLOBAL geospatial_lon_min double -150.9358
attribute NC_GLOBAL geospatial_lon_units String degrees_east
attribute NC_GLOBAL geospatial_vertical_max double 8.83
attribute NC_GLOBAL geospatial_vertical_min double -999.0
attribute NC_GLOBAL geospatial_vertical_positive String down
attribute NC_GLOBAL geospatial_vertical_units String m
attribute NC_GLOBAL infoUrl String https://www.bco-dmo.org/dataset/2470 (external link)
attribute NC_GLOBAL institution String BCO-DMO
attribute NC_GLOBAL instruments_0_acronym String CTD
attribute NC_GLOBAL instruments_0_dataset_instrument_description String CTD measurements taken, CTD unit unidentified
attribute NC_GLOBAL instruments_0_dataset_instrument_nid String 4145
attribute NC_GLOBAL instruments_0_description String The Conductivity, Temperature, Depth (CTD) unit is an integrated instrument package designed to measure the conductivity, temperature, and pressure (depth) of the water column. The instrument is lowered via cable through the water column and permits scientists observe the physical properties in real time via a conducting cable connecting the CTD to a deck unit and computer on the ship. The CTD is often configured with additional optional sensors including fluorometers, transmissometers and/or radiometers. It is often combined with a Rosette of water sampling bottles (e.g. Niskin, GO-FLO) for collecting discrete water samples during the cast. This instrument designation is used when specific make and model are not known.
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 profiler
attribute NC_GLOBAL instruments_0_instrument_nid String 417
attribute NC_GLOBAL instruments_0_supplied_name String Conductivity, Temperature, Depth
attribute NC_GLOBAL keywords String ac3, ac3_fluor, active, available, bco, bco-dmo, biological, chemical, code, cruiseid, data, dataset, day, day_gmt, density, depth, depth_to_bottom, depth_w, dmo, downwelling, downwelling_photosynthetic_photon_radiance_in_sea_water, dyn, dyn_height, earth, Earth Science > Oceans > Ocean Optics > Photosynthetically Active Radiation, Earth Science > Oceans > Ocean Optics > Radiance, Earth Science > Oceans > Salinity/Density > Salinity, erddap, fluor, height, interp, interp_code, latitude, longitude, management, max, min, month, month_gmt, ocean, oceanography, oceans, office, optics, PAR, photon, photosynthetic, photosynthetically, practical, preliminary, press, press_max, press_min, radiance, radiation, salinity, science, sea, sea_water_practical_salinity, seawater, ship, sigma, sigma_t, station, stn, stn_id, temperature, time, time_gmt, trans, water, year
attribute NC_GLOBAL keywords_vocabulary String GCMD Science Keywords
attribute NC_GLOBAL license String https://www.bco-dmo.org/dataset/2470/license (external link)
attribute NC_GLOBAL metadata_source String https://www.bco-dmo.org/api/dataset/2470 (external link)
attribute NC_GLOBAL Northernmost_Northing double 61.2601
attribute NC_GLOBAL param_mapping String {'2470': {'lat': 'flag - latitude', 'depth_to_bottom': 'flag - depth', 'lon': 'flag - longitude'}}
attribute NC_GLOBAL parameter_source String https://www.bco-dmo.org/mapserver/dataset/2470/parameters (external link)
attribute NC_GLOBAL people_0_affiliation String University of Alaska Fairbanks
attribute NC_GLOBAL people_0_affiliation_acronym String UAF
attribute NC_GLOBAL people_0_person_name String Dr Thomas J. Weingartner
attribute NC_GLOBAL people_0_person_nid String 50468
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 BCO-DMO
attribute NC_GLOBAL people_1_person_name String Ms Dicky Allison
attribute NC_GLOBAL people_1_person_nid String 50382
attribute NC_GLOBAL people_1_role String BCO-DMO Data Manager
attribute NC_GLOBAL people_1_role_type String related
attribute NC_GLOBAL project String NEP
attribute NC_GLOBAL projects_0_acronym String NEP
attribute NC_GLOBAL projects_0_description String Program in a Nutshell
Goal: To understand the effects of climate variability and climate change on the distribution, abundance and production of marine animals (including commercially important living marine resources) in the eastern North Pacific. To embody this understanding in diagnostic and prognostic ecosystem models, capable of capturing the ecosystem response to major climatic fluctuations.
Approach: To study the effects of past and present climate variability on the population ecology and population dynamics of marine biota and living marine resources, and to use this information as a proxy for how the ecosystems of the eastern North Pacific may respond to future global climate change. The strong temporal variability in the physical and biological signals of the NEP will be used to examine the biophysical mechanisms through which zooplankton and salmon populations respond to physical forcing and biological interactions in the coastal regions of the two gyres. Annual and interannual variability will be studied directly through long-term observations and detailed process studies; variability at longer time scales will be examined through retrospective analysis of directly measured and proxy data. Coupled biophysical models of the ecosystems of these regions will be developed and tested using the process studies and data collected from the long-term observation programs, then further tested and improved by hindcasting selected retrospective data series.
attribute NC_GLOBAL projects_0_geolocation String Northeast Pacific Ocean, Gulf of Alaska
attribute NC_GLOBAL projects_0_name String U.S. GLOBEC Northeast Pacific
attribute NC_GLOBAL projects_0_project_nid String 2038
attribute NC_GLOBAL projects_0_project_website String http://nepglobec.bco-dmo.org (external link)
attribute NC_GLOBAL projects_0_start_date String 1997-01
attribute NC_GLOBAL publisher_name String Biological and Chemical Oceanographic Data Management Office (BCO-DMO)
attribute NC_GLOBAL publisher_type String institution
attribute NC_GLOBAL sourceUrl String (local files)
attribute NC_GLOBAL Southernmost_Northing double 57.7995
attribute NC_GLOBAL standard_name_vocabulary String CF Standard Name Table v55
attribute NC_GLOBAL subsetVariables String press_min
attribute NC_GLOBAL summary String CTD cast data from 45 R/V Alpha Helix and R/V Wecoma Long-Term Observation Program (LTOP) cruises to the Coastal Gulf of Alaska from 1997-2004 as part of the U.S. GLOBEC program (NEP project)
attribute NC_GLOBAL title String CTD cast data from 45 R/V Alpha Helix and R/V Wecoma Long-Term Observation Program (LTOP) cruises to the Coastal Gulf of Alaska from 1997-2004 as part of the U.S. GLOBEC program (NEP project)
attribute NC_GLOBAL version String 1
attribute NC_GLOBAL Westernmost_Easting double -150.9358
attribute NC_GLOBAL xml_source String osprey2erddap.update_xml() v1.3
variable cruiseid   String  
attribute cruiseid bcodmo_name String cruiseid
attribute cruiseid description String Cruise identifier, e.g. HX217 represents R/V Alpha Helix cruise number 217.
attribute cruiseid long_name String Cruiseid
attribute cruiseid units String no units
variable ship   String  
attribute ship bcodmo_name String ship
attribute ship description String name of the ship or vessel (See also platform.)
attribute ship long_name String Ship
attribute ship units String no units
variable year   short  
attribute year _FillValue short 32767
attribute year actual_range short 1997, 2004
attribute year bcodmo_name String year
attribute year description String year, e.g. 1997
attribute year long_name String Year
attribute year nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/YEARXXXX/ (external link)
attribute year units String no units
variable station   short  
attribute station _FillValue short 32767
attribute station actual_range short 1, 143
attribute station bcodmo_name String station
attribute station description String consecutive station number
attribute station long_name String Station
attribute station units String no units
variable stn_id   String  
attribute stn_id bcodmo_name String station
attribute stn_id description String station identification code
attribute stn_id long_name String Stn Id
attribute stn_id units String no units
variable latitude   double  
attribute latitude _CoordinateAxisType String Lat
attribute latitude _FillValue double NaN
attribute latitude actual_range double 57.7995, 61.2601
attribute latitude axis String Y
attribute latitude bcodmo_name String latitude
attribute latitude colorBarMaximum double 90.0
attribute latitude colorBarMinimum double -90.0
attribute latitude description String latitude, in decimal degrees, north is positive
attribute latitude ioos_category String Location
attribute latitude long_name String Latitude
attribute latitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LATX/ (external link)
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 -150.9358, -143.6689
attribute longitude axis String X
attribute longitude bcodmo_name String longitude
attribute longitude colorBarMaximum double 180.0
attribute longitude colorBarMinimum double -180.0
attribute longitude description String longitude, in decimal degrees, east is positive
attribute longitude ioos_category String Location
attribute longitude long_name String Longitude
attribute longitude nerc_identifier String https://vocab.nerc.ac.uk/collection/P09/current/LONX/ (external link)
attribute longitude standard_name String longitude
attribute longitude units String degrees_east
variable depth_w   short  
attribute depth_w _FillValue short 32767
attribute depth_w actual_range short 0, 4200
attribute depth_w bcodmo_name String depth_w
attribute depth_w colorBarMaximum double 8000.0
attribute depth_w colorBarMinimum double -8000.0
attribute depth_w colorBarPalette String TopographyDepth
attribute depth_w description String water depth, in meters
attribute depth_w long_name String Depth
attribute depth_w standard_name String depth
attribute depth_w units String meters
variable press_min   byte  
attribute press_min _FillValue byte 127
attribute press_min actual_range byte 0, 0
attribute press_min bcodmo_name String press_bar
attribute press_min description String minimum pressure during cast
attribute press_min long_name String Press Min
attribute press_min units String millibars
variable press_max   short  
attribute press_max _FillValue short 32767
attribute press_max actual_range short 3, 1783
attribute press_max bcodmo_name String press_bar
attribute press_max description String maximum pressure during cast
attribute press_max long_name String Press Max
attribute press_max units String millibars
variable month_gmt   String  
attribute month_gmt bcodmo_name String month_gmt
attribute month_gmt description String Month of year, GMT time , i.e. 01-12.
attribute month_gmt long_name String Month Gmt
attribute month_gmt units String no units
variable day_gmt   String  
attribute day_gmt bcodmo_name String day_gmt
attribute day_gmt description String Day, GMT time e.g. 22.
attribute day_gmt long_name String Day Gmt
attribute day_gmt units String no units
variable time_gmt   String  
attribute time_gmt bcodmo_name String time_gmt
attribute time_gmt description String time of day, reported in GMT time, 24 hour clock
attribute time_gmt long_name String Time Gmt
attribute time_gmt units String hhmm
variable press   short  
attribute press _FillValue short 32767
attribute press actual_range short 0, 1783
attribute press bcodmo_name String press_bar
attribute press description String pressure at ctd sampling point
attribute press long_name String Press
attribute press units String millibars
variable temp   float  
attribute temp _FillValue float NaN
attribute temp actual_range float 1.592, 17.206
attribute temp bcodmo_name String temp2
attribute temp description String water temperature, as observed by a CTD unit
attribute temp long_name String Temperature
attribute temp nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/TEMPS601/ (external link)
attribute temp units String degrees Celsius
variable salinity   float  
attribute salinity _FillValue float NaN
attribute salinity actual_range float 15.493, 34.558
attribute salinity bcodmo_name String sal
attribute salinity colorBarMaximum double 37.0
attribute salinity colorBarMinimum double 32.0
attribute salinity description String salinity, calculated from the CTD 'primary sensors' of conductivity and temperature.
attribute salinity long_name String Sea Water Practical Salinity
attribute salinity nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/PSALST01/ (external link)
attribute salinity units String Practical salinity scale, dimensionless
variable sigma_t   float  
attribute sigma_t _FillValue float NaN
attribute sigma_t actual_range float 11.353, 27.614
attribute sigma_t bcodmo_name String sigma-t
attribute sigma_t description String sigma-theta density
attribute sigma_t long_name String Sigma T
attribute sigma_t nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/SIGTEQST/ (external link)
attribute sigma_t units String kilograms per meters cubed - 1000
variable dyn_height   float  
attribute dyn_height _FillValue float NaN
attribute dyn_height actual_range float 0.0, 3.47374
attribute dyn_height bcodmo_name String dynh_0
attribute dyn_height description String dynamic height, referenced to surface
attribute dyn_height long_name String Dyn Height
attribute dyn_height units String meters
variable fluor   float  
attribute fluor _FillValue float NaN
attribute fluor actual_range float -999.0, 5.278
attribute fluor bcodmo_name String fluorescence
attribute fluor description String fluorescence
attribute fluor long_name String Fluor
attribute fluor missing_value float NaN
attribute fluor nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/ (external link)
attribute fluor units String ?
variable ac3_fluor   float  
attribute ac3_fluor _FillValue float NaN
attribute ac3_fluor actual_range float 0.0, 4.99
attribute ac3_fluor bcodmo_name String fluorescence
attribute ac3_fluor description String fluorescence
attribute ac3_fluor long_name String Ac3 Fluor
attribute ac3_fluor nerc_identifier String https://vocab.nerc.ac.uk/collection/P01/current/CPHLPM01/ (external link)
attribute ac3_fluor units String ?
variable trans   float  
attribute trans _FillValue float NaN
attribute trans actual_range float -3.28, 5.02
attribute trans bcodmo_name String trans_v
attribute trans description String light transmission
attribute trans long_name String Trans
attribute trans units String volts
variable PAR   float  
attribute PAR _FillValue float NaN
attribute PAR actual_range float -999.0, 5.0
attribute PAR bcodmo_name String PAR
attribute PAR colorBarMaximum double 70.0
attribute PAR colorBarMinimum double 0.0
attribute PAR description String downwell Photosynthetically Available Radiation
attribute PAR long_name String Downwelling Photosynthetic Photon Radiance In Sea Water
attribute PAR missing_value float NaN
attribute PAR units String uE/cm2/sec
variable depth   double  
attribute depth _CoordinateAxisType String Height
attribute depth _CoordinateZisPositive String down
attribute depth _FillValue double NaN
attribute depth actual_range double -999.0, 8.83
attribute depth axis String Z
attribute depth bcodmo_name String unknown
attribute depth colorBarMaximum double 8000.0
attribute depth colorBarMinimum double -8000.0
attribute depth colorBarPalette String TopographyDepth
attribute depth description String depth from instrument to bottom
attribute depth ioos_category String Location
attribute depth long_name String Depth
attribute depth missing_value double NaN
attribute depth positive String down
attribute depth standard_name String depth
attribute depth units String m
variable interp_code   byte  
attribute interp_code _FillValue byte 127
attribute interp_code actual_range byte 0, 3
attribute interp_code bcodmo_name String unknown
attribute interp_code description String ?
attribute interp_code long_name String Interp Code
attribute interp_code units String ?

The information in the table above is also available in other file formats (.csv, .htmlTable, .itx, .json, .jsonlCSV1, .jsonlCSV, .jsonlKVP, .mat, .nc, .nccsv, .tsv, .xhtml) via a RESTful web service.

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