Seasonal cycle of CO2 from the sea ice edge to island blooms in the Scotia Sea, Southern Ocean
Seasonal cycle of CO2 from the sea ice edge to island blooms in the Scotia Sea, Southern Ocean
复制标题
南大洋斯科舍海从海冰边缘到岛屿水华的二氧化碳季节性循环
DOI：
10.1016/j.marchem.2015.06.031
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发表时间：
2015
期刊：
影响因子：
3
通讯作者：
N. Hardman
中科院分区：
文献类型：
--
作者：
E. Jones;D. Bakker;H. Venables;N. Hardman
斯科舍海地区拥有南大洋最富饶的沃茨。它也是一个通过深水与大气相互作用的动态区域。我们提出了第一个季节性解决的时间序列的逸度的CO2（fCO 2）从2006年春季，2008年夏季，2009年秋季和冬季（潜在温度最低）沿着1000公里的横断面从浮冰到极锋，以量化生物和温度对oceanicfCO 2的影响。春季和夏季海面fCO 2大量减少发生在浮游植物水华中，浮游植物水华在南格鲁吉亚岛（54-55°S，36-38°W）下游（北部）天然含铁沃茨和海冰融化后（在季节性冰区）发展。最大的季节性fCO 2振幅（Δ fCO 2）为− 159 μatm，出现在南格鲁吉亚水华。在这一区域，生物碳吸收占主导地位的季节性信号，减少冬季最大的海洋fCO 2由257 μatm的夏季。在威德尔-斯科舍汇流区，南部边缘的斯科舍海，从冬季的二氧化碳丰富的条件下，在冰覆盖的沃茨的CO2不饱和的春季开花期间和海冰融化后，在oceanicfCO 2产生强烈的季节性变化。温度对海洋fCO 2的影响范围从季节性冰区的Δ fCO 2 sstof ~ 55 μatm到南格鲁吉亚下游的几乎两倍（98 μatm）。表层水fCO 2的季节循环在高营养低叶绿素区域的中央斯科舍海有最弱的生物控制和最低的季节性。全流域生物过程对海洋fCO 2的季节控制占主导地位（Δ fCO 2 bioof 159 μatm），部分（43%）被中等温度控制（Δ fCO 2 sstof 68 μatm）所补偿。整个斯科舍海的生产力拼凑在一起，形成了南大洋季节性强烈的二氧化碳生物吸收区。
The Scotia Sea region contains some of the most productive waters of the Southern Ocean. It is also a dynamic region through the interaction of deep water masses with the atmosphere. We present a first seasonally-resolved time series of the fugacity of CO2(fCO2) from spring 2006, summer 2008, autumn 2009 and winter (potential temperature minimum) along a 1000 km transect from the pack ice to the Polar Front to quantify the effects of biology and temperature on oceanicfCO2. Substantial spring and summer decreases in sea surfacefCO2occurred in phytoplankton blooms that developed in the naturally iron-fertilised waters downstream (north) of South Georgia island (54–55°S, 36–38°W) and following sea ice melt (in the seasonal ice zone). The largest seasonalfCO2amplitude (ΔfCO2) of − 159 μatm was found in the South Georgia bloom. In this region, biological carbon uptake dominated the seasonal signal, reducing the winter maxima in oceanicfCO2by 257 μatm by the summer. In the Weddell–Scotia Confluence, the southern fringe of the Scotia Sea, the shift from wintertime CO2-rich conditions in ice covered waters to CO2undersaturation in the spring blooms during and upon sea ice melt created strong seasonality in oceanicfCO2. Temperature effects on oceanicfCO2ranged from ΔfCO2 sstof ~ 55 μatm in the seasonal ice zone to almost double that downstream of South Georgia (98 μatm). The seasonal cycle of surface waterfCO2in the high-nutrient low-chlorophyll region of the central Scotia Sea had the weakest biological control and lowest seasonality. Basin-wide biological processes dominated the seasonal control on oceanicfCO2(ΔfCO2 bioof 159 μatm), partially compensated (43%) by moderate temperature control (ΔfCO2 sstof 68 μatm). The patchwork of productivity across the Scotia Sea creates regions of seasonally strong biological uptake of CO2in the Southern Ocean.
影响因子：
3.6
作者：
Boehme, L.;Meredith, M. P.;Fedak, M.
通讯作者：
Fedak, M.