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| griddap | Subset | tabledap | Make A Graph | wms | files | Accessible | Title | Summary | FGDC | ISO 19115 | Info | Background Info | RSS | Institution | Dataset ID | |
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| log in | [Port Fourchon, LA twenty year temperature analysis] - Data and code from an analysis of twenty years of winter minimum temperature data near Port Fourchon, LA from 2002 to 2022 (CAREER: Integrating Seascapes and Energy Flow: learning and teaching about energy, biodiversity, and ecosystem function on the frontlines of climate change) | This dataset analyzes twenty years of winter minimum temperature data from the Louisiana Coast Wide Reference Monitoring Systems database using 11 stations of data closest to the sampling locations for the primary project. We downloaded monthly averaged data from 2002 to 2022 from each site and used these values to calculate our minimum temperature data. This dataset was published in Leavitt et al. (2024; pre-print DOI 10.22541/au.173090741.17018561/v1).\n\ncdm_data_type = Other\nVARIABLES:\nStation_id (unitless)\nlatitude (degrees_north)\nlongitude (degrees_east)\nmonth (unitless)\nyear (unitless)\navg_temperature (degrees Celsius)\nstd_deviation_water_temperature (degrees Celsius)\nmin_temperature (degrees Celsius)\nmax_temperature (degrees Celsius)\n | BCO-DMO | bcodmo_dataset_941490_v1 | ||||||||||||
| log in | [Thermalgravimetric analysis] - Photodegradation of macroplastics in the marine environment: Thermalgravimetric analysis (EAGER: Collaborative Research: NSF2026: Is Plastic Degradation Occurring in the Deep Ocean Water Column?) | The photodegradation of macroplastics in the marine environment remains poorly understood. Here, we investigated the weathering of commercially available plastics (tabs 1.3 × 4.4 × 0.16 cm), including high-density polyethylene, low-density polyethylene, polypropylene, polystyrene, and polycarbonate, in seawater under laboratory-simulated ultraviolet A radiation for 3–9 months, equivalent to 25–75 years of natural sunlight exposure without considering other confounding factors. After the exposure, the physical integrity and thermal stability of the tabs remained relatively intact, suggesting that the bulk polymer chains were not severely altered despite strong irradiation, likely due to their low specific surface area. In contrast, the surface layer (∼1 μm) of the tabs was highly oxidized and eroded after 9 months of accelerated weathering. Several antioxidant additives were identified in the plastics through low temperature pyrolysis coupled with gas chromatography/mass spectrometry (Pyr-GC/MS) analysis. The Pyr-GC/MS results also revealed many new oxygen-containing compounds formed during photodegradation, and these compounds indicated the dominance of chain scission reactions during weathering. These findings highlight the strong resistance of industrial macroplastics to weathering, emphasizing the need for a broader range of plastics with varying properties and sizes to accurately estimate plastic degradation in the marine environment.\n\ncdm_data_type = Other\nVARIABLES:\nPolymer_name (unitless)\nPolymer_acronym (unitless)\nIncubation_time (units)\nUnit_of_incubation_time (unitless)\nReplicate (unitless)\nOnset_Temperature (decimal degrees (°C))\nMax_Temperature (decimal degrees (°C))\nUnit_of_Temperature (unitless)\n | BCO-DMO | bcodmo_dataset_946726_v1 |