Contrasting effects of temperature and winter mixing on the seasonal and inter-annual variability of the carbonate system in the Northeast Atlantic Ocean
Contrasting effects of temperature and winter mixing on the seasonal and inter-annual variability of the carbonate system in the Northeast Atlantic Ocean
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DOI：
10.5194/bg-7-1481-2010
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发表时间：
2010-01-01
期刊：
影响因子：
4.9
通讯作者：
Hydes, D. J.
中科院分区：
文献类型：
--
作者：
Dumousseaud, C.;Achterberg, E. P.;Hydes, D. J.
由于大气CO2浓度增加而引起的未来气候变化预计将对海洋产生强烈影响，在低纬度和中纬度海洋区域，冬季混合变浅，初级生产随之减少，海洋碳减少。在这里，我们测试这一假设，通过研究2005年和2007年之间的东北大西洋的表面沃茨的碳酸盐系统上的冷，暖冬的影响。每月的意见之间的英吉利海峡和比斯开湾使用船舶的机会计划。在2005/2006年较冷的冬季，混合层的最大深度达到比斯开湾650米，而在2006/2007年较暖的冬季（2.6 +/- 0.5 A摄氏度）的混合层深度仅达到300米。冬末硝酸盐浓度（2.8 +/- 1.1 μ mol l（-1））和溶解无机碳浓度（22 +/- 6 μ mol kg（-1））的年际差异，在较冷的冬季（2005/2006年）结束时浓度较高，导致随后生长季节溶解氧异常和叶绿素α荧光数据的差异。与模式预测相反，计算的海气CO2通量（范围为+3.7至-4.8 mmol m（-2）d（-1））显示，在2006/2007年暖冬之后，比斯开湾的海洋CO2吸收增加，与风速和海面温度差异有关。
Future climate change as a result of increasing atmospheric CO2 concentrations is expected to strongly affect the oceans, with shallower winter mixing and consequent reduction in primary production and oceanic carbon drawdown in low and mid-latitudinal oceanic regions. Here we test this hypothesis by examining the effects of cold and warm winters on the carbonate system in the surface waters of the Northeast Atlantic Ocean for the period between 2005 and 2007. Monthly observations were made between the English Channel and the Bay of Biscay using a ship of opportunity program. During the colder winter of 2005/2006, the maximum depth of the mixed layer reached up to 650 m in the Bay of Biscay, whilst during the warmer (by 2.6 +/- 0.5 A degrees C) winter of 2006/2007 the mixed layer depth reached only 300 m. The inter-annual differences in late winter concentrations of nitrate (2.8 +/- 1.1 mu mol l(-1)) and dissolved inorganic carbon (22 +/- 6 mu mol kg(-1), with higher concentrations at the end of the colder winter (2005/2006), led to differences in the dissolved oxygen anomaly and the chlorophyll alpha-fluorescence data for the subsequent growing season. In contrast to model predictions, the calculated air-sea CO2 fluxes (ranging from +3.7 to -4.8 mmol m(-2) d(-1)) showed an increased oceanic CO2 uptake in the Bay of Biscay following the warmer winter of 2006/2007 associated with wind speed and sea surface temperature differences.