期刊
DEEP-SEA RESEARCH PART I-OCEANOGRAPHIC RESEARCH PAPERS
卷 64, 期 -, 页码 157-174出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.dsr.2012.01.012
关键词
North Atlantic; Spring bloom; Lagrangian float; Net community production; Carbon export; Sensors
类别
资金
- National Science Foundation [OCE0628379, OCE0628107]
- NASA [NNX08AL92G]
- Royal Society Wolfson Research Merit [WM05263]
- NASA [NNX08AL92G, 98293] Funding Source: Federal RePORTER
Budgets of nitrate, dissolved oxygen, and particulate organic carbon (POC) were constructed from data collected on-board a Lagrangian, profiling float deployed between April 4 and May 25, 2008, as part of the North Atlantic Bloom Experiment. These measurements were used to estimate net community production (NCP) and apparent export of POC along the float trajectory. A storm resulting in deep mixing and temporary suspension of net production separated the bloom into early (April 23-27) and main (May 6-13) periods over which similar to 264 and similar to 805 mmol C m(-2) were produced, respectively. Subtraction of the total POC production from the NCP yielded maximum estimates of apparent POC export amounting to similar to 92 and 574 mmol C m(-2) during the early and main blooms, respectively. The bloom terminated the following day and similar to 282 mmol C m(-2) were lost due to net respiration (70%) and apparent export (30%). Thus, the majority of the apparent export of POC occurred continuously during the main bloom and a large respiration event occurred during bloom Termination. A comparison of the POC flux during the main bloom period with independent estimates at greater depth suggest a rapid rate of remineralization between 60 and 100 m. We suggest the high rates of remineralization in the upper layers could explain the apparent lack of carbon overconsumption (C:N > 6.6) in the North Atlantic during the spring bloom. Published by Elsevier Ltd.
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