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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Interannual variability in atmospheric CO_2uptake on the northeastU.S. continental shelf
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Interannual variability in atmospheric CO_2uptake on the northeastU.S. continental shelf

机译：美国东北部大气CO_2吸收的年际变化陆架

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摘要

Continental shelf systems are thought to play an important role in the exchange ofcarbon dioxide (CO_2) between the atmosphere and ocean. Currently, our ability toquantify the air-sea flux of CO_2on continental shelves is limited due to large spatial andtemporal variability coupled with historically sparse oceanographic measurements (e.g., ofsurface water pCO_2). Here we use the Regional Ocean Modeling System (ROMS) toquantify the air-sea flux of CO_2and its interannual variability on the northeast U.S.continental shelf, which includes the Middle Atlantic Bight (MAB) and Gulf of Maine(GOM). Two years marked by opposite phases of the North Atlantic Oscillation (NAO)are considered in the study. A novel analysis method, second-order Taylor seriesdecomposition, is used to identify the important processes responsible for producingNAO-related changes in the CO_2air-sea flux. On the northeast U.S. shelf, atmosphericCO2 uptake as simulated by ROMS decreases from 2.4 Mt C yr~(-1)in 1985 (low NAO)to 1.8 Mt C yr~(-1)in 1990 (high NAO), with most of this decrease (0.5 Mt C yr~(- )1)occurring in the MAB. In the MAB the difference in annual air-sea flux of CO_2is duemainly to changes in near-surface wind speed, while the flux difference in the GOM iscontrolled primarily by surface water pCO_2(CO_2partial pressure) changes resulting fromchanges in sea surface temperature and new production. The large magnitude ofinterannual variability in the air-sea flux of CO_2simulated here suggests the potential foreven more significant flux changes in the future as climate change accelerates.
机译：大陆架系统被认为在大气与海洋之间的二氧化碳（CO_2）交换中起着重要作用。当前，由于大的时空变化以及历史上稀疏的海洋学测量结果（例如，地表水pCO_2），我们对大陆架上CO_2的海海通量进行量化的能力受到限制。在这里，我们使用区域海洋建模系统（ROMS）量化了美国东北部陆架（包括中大西洋海岸线（MAB）和缅因州海湾（GOM））上的CO_2的海气通量及其年际变化。在研究中考虑了以北大西洋涛动（NAO）的相反阶段为标志的两年。一种新颖的分析方法，即二阶泰勒级数分解法，用于确定导致CO_2-海气通量与NAO相关变化的重要过程。在ROM模拟的美国东北陆架，大气CO2吸收量从1985年的2.4 Mt Cyr〜（-1）（低NAO）下降到1990年的1.8 Mt Cyr〜（-1）（高NAO），其中大部分MAB发生减少（0.5 Mt C yr〜（-）1）。在MAB中，CO_2的年度海气通量差异主要是由于近地表风速的变化，而GOM中的通量差异主要由地表水pCO_2（CO_2分压）的变化控制，这是由于海表温度变化和新生产而引起的。 。此处模拟的CO_2气海通量的年际变化很大，这表明随着气候变化的加速，未来通量的潜在变化甚至更大。

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