Seasonal variation in the correlation between anomalies of sea 1 level and chlorophyll in the Antarctic Circumpolar Current 2 region
Seasonal variation in the correlation between anomalies of sea 1 level and chlorophyll in the Antarctic Circumpolar Current 2 region
复制标题
南极绕极流2区域海平面1异常与叶绿素相关性的季节变化
DOI：
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发表时间：
2017
期刊：
影响因子：
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通讯作者：
McGillicuddy
中科院分区：
文献类型：
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作者：
Hajoon Song;M. Long;P. Gaube;I. Frenger;J. Marshall;J. Dennis;McGillicuddy
20我们分析了卫星观测和一个涡旋丰富的海洋模型，结果表明，中尺度现象，如锋面和涡旋，强烈影响南大洋的叶绿素（CHL）浓度，导致冬季CHL异常与夏季相反。在南半球冬季，正海面高度（SSH）异常24所在的较深混合层减少了光的可用性，导致CHL浓度异常低。然而，在光照充足的南方25夏季，SSH正异常26处的铁浓度较高，CHL浓度也较高。模式的收支分析表明，与中尺度相关的异常垂直混合使得夏季混合层的铁供应量不同。具有负SSH异常的特征表现出相反的趋势：29冬季CHL浓度较高，冬季较低。我们的研究结果表明，铁供应，光的可用性和垂直混合的中尺度过程的调制在引起初级生产力的系统变化中起着重要的作用。32
20 We analyze satellite observations and an eddy-rich ocean model to show that mesoscale 21 phenomena, such as fronts and eddies, strongly influence chlorophyll (CHL) concentra22 tions in the Southern Ocean, driving CHL anomalies of opposite sign in winter versus 23 summer. In austral winter, deeper mixed layers in positive sea surface height (SSH) anoma24 lies reduce light availability, leading to anomalously low CHL concentration. In austral 25 summer with abundant light, however, higher iron concentration in positive SSH anoma26 lies yields higher CHL concentrations. The budget analysis of the model shows that anoma27 lous vertical mixing associated with the mesoscale makes iron supply to the summertime 28 mixed layer differ. Features with a negative SSH anomaly exhibit the opposite tendencies: 29 higher CHL concentration in winter and lower in winter. Our results suggest that modula30 tion of iron supply, light availability and vertical mixing by mesoscale processes plays an 31 important role in causing systematic variations in primary productivity. 32