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首页> 外文期刊>Tellus, Series B. Chemical and Physical Meteorology >Interannual and decadal variability of the oceanic carbon sink in the North Atlantic subpolar gyre
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Interannual and decadal variability of the oceanic carbon sink in the North Atlantic subpolar gyre

机译:北大西洋亚极回旋区海洋碳汇的年际和年代际变化

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The evaluation of interannual and decadal variations of air-sea CO2 fluxes represents important step for understanding the changes in the global carbon cycle. In this study we analyse the variations of sea surface dissolved inorganic carbon (DIC) and total alkalinity (TA) in the North Atlantic over the period 1993-2003 (SURATLANT Program). The analysis focuses on the subpolar gyre (53 degrees N-62 degrees N/45 degrees W-20 degrees W). Large interannual variability of DIC and air-sea CO2 fluxes is observed mostly during summer. In the extreme case, this region was a CO2 source in 2003 explained by a dramatic warming and the absence of late-summer bloom. At the decadal scale, DIC and TA concentrations appeared stable indicating a complex balance between primary production, vertical mixing, horizontal transport and anthropogenic CO2. We also found that winter fCO(2) has increased at a rate of +2.8 mu atm yr(-1) between 1993 and 2003, due to strong surface warming (1.5 degrees C over 10 yr) particularly since winter 1995 when the North Atlantic Oscillation index moved into a negative phase. This resulted in a decrease of carbon uptake in the North Atlantic subpolar gyre, a trend also suggested for the period 1972-1989 but not captured by current class atmospheric inverse models.
机译:评估海气CO2通量的年际和年代际变化是了解全球碳循环变化的重要一步。在这项研究中,我们分析了北大西洋在1993-2003年期间海表溶解的无机碳(DIC)和总碱度(TA)的变化(SURATLANT计划)。分析着重于亚极回旋(53度N-62度N / 45度W-20度W)。 DIC和气海CO2通量的年际变化很大,主要是在夏季。在极端情况下,该地区是2003年的CO2排放源,其原因是剧烈的变暖和没有夏末盛开。在十年尺度上,DIC和TA浓度似乎稳定,表明初级生产,垂直混合,水平运输和人为CO2之间存在复杂的平衡。我们还发现,1993年至2003年之间,冬季fCO(2)以+2.8μatm yr(-1)的速度增加,这是由于强烈的地表暖化(10年间温度为1.5摄氏度),尤其是自1995年冬季北大西洋以来振荡指数进入负相位。这导致北大西洋亚极回旋流的碳吸收减少,这种趋势在1972年至1989年期间也有暗示,但目前的大气逆模型没有反映出来。

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