Influences of the Great Whirl on surface chlorophyll a concentration off the Somali Coast in 2017
Influences of the Great Whirl on surface chlorophyll a concentration off the Somali Coast in 2017
复制标题
2017年大旋风对索马里海岸表面叶绿素a浓度的影响
DOI：
10.1007/s13131-021-1740-3
复制
发表时间：
2021
影响因子：
1.4
通讯作者：
Yan Du
中科院分区：
文献类型：
--
作者：
Lingxing Dai;Bing Han;Shilin Tang;Chuqun Chen;Yan Du
利用卫星资料和模式输出资料研究了2017年索马里近海大漩涡的基本特征及其对叶绿素a浓度的影响。结果表明，6月13日在北纬7°，东经53°处发生的GW周期为153d，平均振幅为16 cm，平均半径为205公里。在GW形成后，除7月上旬和10月中旬外，GW内部Chla的浓度在整个生活史中均呈下降趋势。7月上旬，GW内部的Chl a水华是三个过程共同作用的结果。它们分别是涡旋水平输送、季风和涡旋泵送引起的混合层加深、涡流诱导的Ekman泵送引起的营养盐向上输送。在10月份，Chl a花可能是由于GW减弱所致。在此期间，涡旋之间的水交换更加频繁，浮游植物被输入到GW的内部。
The general features of the Great Whirl (GW) off the Somali Coast in 2017 and its influences on chlorophyll a (Chl a) concentration were studied by using satellite data and model outputs. Results show that GW, which initiated at 7°N, 53°E on June 13, had a lifetime of 153 d with an average amplitude of 16 cm and an average radius of 205 km. After the formation of GW, the concentration of Chl a in the interior of GW showed a downward trend throughout its life cycle, except in early July and mid-October. In early July, the Chl a blooms in the interior of GW were attributed to the combined effect of three processes. They are eddy horizontal transportation, the deepening of the mixed layer caused by the monsoon and eddy pumping, and the upward transportation of nutrients caused by eddy-induced Ekman pumping. In October, the Chl a blooms were probably due to the weakening of GW. During the period, water exchange occurred more frequently across the eddy, thus phytoplanktons were imported into the interior of GW.