期刊
DEEP-SEA RESEARCH PART II-TOPICAL STUDIES IN OCEANOGRAPHY
卷 139, 期 -, 页码 89-102出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr2.2016.07.016
关键词
Net community production; Carbon sink; Ice melt; Iron; Climate change
类别
资金
- Natural Environment Research Council
- National Science Foundation Graduate Research Fellowship [1106401]
- NSF [OPP-1043339, PLR-1344502, 1440435, ANT-0838995]
- LTER Program of the US National Science Foundation [ANT-0823101]
- NERC [bas0100033] Funding Source: UKRI
- Natural Environment Research Council [bas0100033] Funding Source: researchfish
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1341647] Funding Source: National Science Foundation
- Directorate For Geosciences
- Office of Polar Programs (OPP) [1142250] Funding Source: National Science Foundation
The Western Antarctic Peninsula (WAP) is a highly productive marine environment that is undergoing rapid change, with consequences for productivity and total ecosystem carbon cycling. We present continuous underway O-2/Ar estimates of net community production (NCPO2Ar) in austral summer 2012, 2013 and 2014 at sub-kilometer horizontal resolution within the Palmer Long-Term Ecological Research (PalLTER) grid region of the WAP. Substantial spatial variability is observed with NCPO2Ar ranging from 0 to 790 mmol O-2 m(-2) d(-1) and considerable interannual variability with mean values in the grid region of 54.4 +/- 48.5, 44.6 +/- 40.5, and 85.6 +/- 75.9 mmol O-2 m(-2) d(-1) in 2012, 2013 and 2014 respectively. Based on a strong correlation (r(2)=0.83) between residence time integrated NCPO2Ar, and NCPDIC derived from seasonal DIC drawdown, we find the observed NCPO2Ar spatial and interannual variability to be consistent with the December-January NCPDIC magnitude. Seeking to explain the mechanistic drivers of NCP in the WAP, we observe a linear relationship between NCPO2Ar and meteoric water content derived from 5180 and salinity. This correlation may be due to Fe supply from glacial melt and/or strengthening of stratification and relief of light limitation. Elevated surface Fe availability, as indicated by F-v/F-m, and measurements of surface water dissolved Fe and Mn (a rough proxy for recent potential Fe availability), and shallower, more stable mixed layers are present where meteoric water and/or sea ice melt is high near the coast. Light limitation is evident in the WAP when mixed layer depths are greater than similar to 40 m. Additionally we document hotspots of NCP associated with submarine canyons along the WAP. While it is difficult to predict how the physical-biological system might evolve under changing climatic conditions, it is evident that NCP, and potentially carbon flux out of the mixed layer, along the WAP will be sensitive to shifts in meltwater input and timing. (C) 2016 Elsevier Ltd. All rights reserved.
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