Moran, S Bradley; Lomas, Michael W; Kelly, R P; Gradinger, Rolf; Iken, K; Mathis, Jeremy T (2012): Net primary productivity, POC export, Th234 and U238 activities and abundance of autotrophs during U.S.C.G.C. Healy cruises HLY0802 and HLY0803 [dataset publication series]. PANGAEA, https://doi.org/10.1594/PANGAEA.817088, Supplement to: Moran, SB et al. (2012): Seasonal succession of net primary productivity, particulate organic carbon export, and autotrophic community composition in the eastern Bering Sea. Deep Sea Research Part II: Topical Studies in Oceanography, 65-70, 84-97, https://doi.org/10.1016/j.dsr2.2012.02.011
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Abstract:
Seasonal patterns in the partitioning of phytoplankton carbon during receding sea ice conditions in the eastern Bering Sea water column are presented using rates of 14C net primary productivity (NPP), phototrophic plankton carbon content, and POC export fluxes from shelf and slope waters in the spring (March 30-May 6) and summer (July 3-30) of 2008. At ice-covered and marginal ice zone (MIZ) stations on the inner and middle shelf in spring, NPP averaged 76 ± 93 mmol C/m**2/d, and in ice-free waters on the outer shelf NPP averaged 102 ± 137 mmol C/m**2/d. In summer, rates of NPP were more uniform across the entire shelf and averaged 43 ± 23 mmol C/m**2/d over the entire shelf. A concomitant shift was observed in the phototrophic pico-, nano-, and microplankton community in the chlorophyll maximum, from a diatom dominated system (80 ± 12% autotrophic C) in ice covered and MIZ waters in spring, to a microflagellate dominated system (71 ± 31% autotrophic C) in summer. Sediment trap POC fluxes near the 1% PAR depth in ice-free slope waters increased by 70% from spring to summer, from 10 ± 7 mmol C/m**2/d to 17 ± 5 mmol C/m**2/d, respectively. Over the shelf, under-ice trap fluxes at 20 m were higher, averaging 43 ± 17 mmol C/m**2/d POC export over the shelf and slope estimated from 234Th deficits averaged 11 ± 5 mmol C/m**2/d in spring and 10 ± 2 mmol C/m**2/d in summer. Average e-ratios calculated on a station-by-station basis decreased by ~ 30% from spring to summer, from 0.46 ± 0.48 in ice-covered and MIZ waters, to 0.33 ± 0.26 in summer, though the high uncertainty prevents a statistical differentiation of these data.
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Coverage:
Median Latitude: 58.495417 * Median Longitude: -171.241389 * South-bound Latitude: 54.419030 * West-bound Longitude: -179.426000 * North-bound Latitude: 62.260000 * East-bound Longitude: -163.899300
Date/Time Start: 2008-03-30T00:00:00 * Date/Time End: 2008-07-28T15:46:00
Comment:
Data extracted in the frame of a joint ICSTI/PANGAEA IPY effort, see http://doi.pangaea.de/10.1594/PANGAEA.150150
License:
Creative Commons Attribution 3.0 Unported (CC-BY-3.0)
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3 datasets
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Datasets listed in this publication series
- Moran, SB; Lomas, MW; Kelly, RP et al. (2013): (Table 2) Autotrophic group-specific carbon biomass and abundance during U.S.C.G.C. Healy cruises HLY0802 and HLY0803 in the Bering Sea. https://doi.org/10.1594/PANGAEA.817087
- Moran, SB; Lomas, MW; Kelly, RP et al. (2013): (Table 1) Net primary productivity, 234Th and POC flux, and e-ratios during U.S.C.G.C. Healy cruises HLY0802 and HLY0803 in the Bering Sea. https://doi.org/10.1594/PANGAEA.817086
- Moran, SB; Lomas, MW; Kelly, RP et al. (2013): (Table A1) Thorium 234 and uranium 238 activities during U.S.C.G.C. Healy cruises HLY0802 and HLY0803 in the Bering Sea. https://doi.org/10.1594/PANGAEA.817085