Manning, Cara C M; Zheng, Zhiyin; Fenwick, Lindsay; McCulloch, Ross D; Damm, Ellen; Izett, Robert W; Williams, William J; Zimmermann, Sarah; Vagle, Svein; Tortell, Philippe Daniel (2022): Methane and nitrous oxide sea-air fluxes calculated from samples collected in the North American Arctic Ocean (2015–2018) [dataset]. PANGAEA, https://doi.org/10.1594/PANGAEA.941199, In: Manning, CCM et al. (2022): Methane and nitrous oxide dissolved gas concentrations and sea-air fluxes from rivers and seawater in the North American Arctic (2015–2019) [dataset bundled publication]. PANGAEA, https://doi.org/10.1594/PANGAEA.941201
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Abstract:
This dataset contains methane and nitrous oxide dissolved gas concentration, dissolved methane carbon isotope, and ancillary hydrographic data from research cruises in the North American Arctic Ocean between 2015-2018. Ocean samples for methane and nitrous oxide analysis were collected from Niskin bottles mounted on a CTD rosette. Water was collected into glass serum bottles and allowed to overflow three times before preserving with mercuric chloride and sealing with with butyl rubber stoppers and aluminum crimp seals. Gas concentrations were determined using a purge and trap system coupled to a gas chromatograph/mass spectrometer, following the method of Capelle et al. (2015). Equilibrium dry atmospheric concentrations were 328.25, 329.14, 330.11, and 330.96 ppb for N2O and 1919.64, 1933.67, 1934.92, and 1933.50 ppb for CH4 in 2015, 2016, 2017, and 2018, respectively. Equilibrium dissolved concentrations were calculated from the measured temperature and salinity following Wiesenburg and Guinasso (1979) for CH4 and Weiss and Price (1980) for N2O. Equilibrium concentrations were calculated based on sample temperature and salinity and the atmospheric N2O or CH4 concentrations measured at Barrow, Alaska by the NOAA Earth System Research Laboratory Global Monitoring Division (Dlugokencky et al., 2020a,b), with corrections to local sea level pressure and 100% humidity. Oxygen concentration was determined using an oxygen sensor mounted on the Niskin rosette, calibrated with discrete samples analyzed by Winkler titration. The mixed layer depth was defined based on a potential density difference criterion of 0.125 kg/m³ relative to the density at 5 m depth, using CTD profiles binned to 1 m. The mixed layer depth was set to 5 m as a minimum. The instantaneous gas transfer velocities and fluxes are based on the instantaneous wind speed at the time of sampling. The 30-day weighted gas transfer velocities and fluxes are integrated over the residence time of the gas in the mixed layer, using up to the prior 30 days of observations, following the method of Teeter et al. (2018) as described in the main manuscript of Manning et al. (2022). The 60-day weighted gas transfer velocities and fluxes are integrated over the residence time of the gas in the mixed layer, using the prior 60 days of observations, following the method of Teeter et al. (2018) as described in the main manuscript of Manning et al. (2022). Atmospheric sea level pressure was obtained from the NCEP/NCAR reanalysis product, which is provided by the NOAA-ESRL Physical Sciences Laboratory (https://psl.noaa.gov/data/gridded). Fractional ice cover was obtained from the EUMETSAT Ocean and Sea Ice Satellite Application Facility (https://osi-saf.eumetsat.int). Sea ice concentration product AMSR-2 (identifier OSI-408) was used in 2017–2018 and SSMIS (identifier OSI-401-b) was used in 2015–2016.
Supplement to:
Manning, Cara C M; Zheng, Zhiyin; Fenwick, Lindsay; McCulloch, Ross D; Damm, Ellen; Izett, Robert W; Williams, William J; Zimmermann, Sarah; Vagle, Svein; Tortell, Philippe Daniel (2022): Interannual variability in methane and nitrous oxide concentrations and sea‐air fluxes across the North American Arctic Ocean (2015–2019). Global Biogeochemical Cycles, 36, e2021GB007185, https://doi.org/10.1029/2021GB007185
Further details:
Capelle, David W; Dacey, John W; Tortell, Philippe Daniel (2015): An automated, high through-put method for accurate and precise measurements of dissolved nitrous-oxide and methane concentrations in natural waters. Limnology and Oceanography-Methods, 13(7), 345-355, https://doi.org/10.1002/lom3.10029
Dlugokencky, Edward J; Crotwell, Andy; Mund, John; Crotwell, Molly; Thoning, Kirk W (2020): Atmospheric Methane Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 1983-2019, Version: 2020-07. NOAA ESRL GML CCGG Group, https://doi.org/10.15138/VNCZ-M766
Dlugokencky, Edward J; Crotwell, Andy; Mund, John; Crotwell, Molly; Thoning, Kirk W (2020): Atmospheric Nitrous Oxide Dry Air Mole Fractions from the NOAA GML Carbon Cycle Cooperative Global Air Sampling Network, 1997-2019, Version: 2020-07. NOAA ESRL GML CCGG Group, https://doi.org/10.15138/53g1-x417
Manning, Cara C M; Nicholson, David P (2022): dnicholson/gas_toolbox: MATLAB code for calculating gas fluxes (Version v1.0.6). Zenodo, https://doi.org/10.5281/zenodo.6126685
Teeter, Lianna; Hamme, Roberta C; Ianson, Debby; Bianucci, Laura (2018): Accurate Estimation of Net Community Production From O2/Ar Measurements. Global Biogeochemical Cycles, 32(8), 1163-1181, https://doi.org/10.1029/2017GB005874
Weiss, Ray F; Price, B A (1980): Nitrous oxide solubility in water and seawater. Marine Chemistry, 8(4), 347-359, https://doi.org/10.1016/0304-4203(80)90024-9
Wiesenburg, Denis A; Guinasso Jr., Norman L (1979): Equilibrium solubilities of methane, carbon monoxide, and hydrogen in water and sea water. Journal of Chemical and Engineering Data, 24(4), 356-360, https://doi.org/10.1021/je60083a006
Project(s):
Coverage:
Median Latitude: 69.584016 * Median Longitude: -132.885534 * South-bound Latitude: 55.387300 * West-bound Longitude: -175.063167 * North-bound Latitude: 78.328300 * East-bound Longitude: -48.458733
Date/Time Start: 2015-07-14T14:18:29 * Date/Time End: 2018-09-29T12:07:02
Minimum DEPTH, water: 1.06 m * Maximum DEPTH, water: 11.46 m
Event(s):
AMD15_2_312-1 (312) * Latitude: 69.164867 * Longitude: -100.696683 * Date/Time: 2015-08-17T20:41:00 * Location: Arctic Ocean * Campaign: AMD15_2 (LEG 2 GEOTRACES/ARCTICNET) * Basis: CCGS Amundsen * Method/Device: CTD/Rosette (CTD-RO)
AMD15_2_314-1 (314) * Latitude: 68.968883 * Longitude: -105.461617 * Date/Time: 2015-08-18T16:13:00 * Location: Arctic Ocean * Campaign: AMD15_2 (LEG 2 GEOTRACES/ARCTICNET) * Basis: CCGS Amundsen * Method/Device: CTD/Rosette (CTD-RO)
AMD15_2_325-1 (325) * Latitude: 73.818667 * Longitude: -80.489417 * Date/Time: 2015-08-11T23:53:00 * Location: Arctic Ocean * Campaign: AMD15_2 (LEG 2 GEOTRACES/ARCTICNET) * Basis: CCGS Amundsen * Method/Device: CTD/Rosette (CTD-RO)
Parameter(s):
License:
Creative Commons Attribution 4.0 International (CC-BY-4.0)
Status:
Curation Level: Enhanced curation (CurationLevelC)
Size:
6776 data points
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