厄加勒斯洄流区东移对其南侧叶绿素 a 水华的影响。
Effects of an eastward shift in the Agulhas retroflection region on chlorophyll-a bloom on its south flank.
机构信息
Jiangsu Key Laboratory of Marine Bioresources and Environment /Jiangsu Key Laboratory of Marine Biotechnology, Jiangsu Ocean University, Lianyungang, Jiangsu Province, China.
Lianyungang Meteorological Bureau, Lianyungang, Jiangsu Province, China.
出版信息
PLoS One. 2023 Mar 27;18(3):e0281766. doi: 10.1371/journal.pone.0281766. eCollection 2023.
As observed by remote sensing images in December 2013 and January 2014, chlorophyll-a (Chl-a) bloom occurred on the south side of the Agulhas Current (38°S-45°S). The dynamic mechanisms of Chl-a bloom were studied by satellite remote sensing data, reanalysis data and Argo data. The periodic shedding of the Agulhas ring led to a significant eastward shift of the Agulhas retroflection from December 2013 to January 2014, without the obstruction of flowing complex eddies and with increased current flow. Then, the horizontal transfer of Chl-a occurred along the south side of the Agulhas Current (38°S-45°S). Nitrate concentrations reached 10-15 μmol·L-1 on the south side of the Agulhas Current, where a deepened mixed layer and upwelling and the vertical transport of nutrients contributed to the Chl-a bloom. In addition, sufficient light and suitable precipitation provide good conditions for Chl-a bloom on the south side of the Agulhas Current.
根据 2013 年 12 月和 2014 年 1 月的遥感图像观测，在南设得兰群岛海域（38°S-45°S）发现有叶绿素-a（Chl-a）爆发。利用卫星遥感数据、再分析数据和 Argo 数据研究了 Chl-a 爆发的动力机制。由于阿古拉斯环的周期性脱落，2013 年 12 月至 2014 年 1 月，阿古拉斯逆流发生了显著的东向移动，没有流动复杂漩涡的阻碍，且流速增加。随后，Chl-a 沿着阿古拉斯洋流的南侧（38°S-45°S）发生水平转移。阿古拉斯洋流南侧的硝酸盐浓度达到 10-15μmol·L-1，由于混合层加深、上升流以及营养物质的垂直输运，导致 Chl-a 爆发。此外，充足的光照和适宜的降水为阿古拉斯洋流南侧的 Chl-a 爆发提供了良好的条件。
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