Short-term variability of phytoplankton blooms associated with a cold eddy in the northwestern Arabian Sea
Short-term variability of phytoplankton blooms associated with a cold eddy in the northwestern Arabian Sea
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DOI：
10.1016/s0034-4257(01)00334-0
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发表时间：
2002-07
影响因子：
13.5
通讯作者：
D. Tang;H. Kawamura;A. J. Luis
中科院分区：
文献类型：
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作者：
D. Tang;H. Kawamura;A. J. Luis
阿拉伯海北部是一个初级生产力较高的半封闭海域，由多个涡流组成的复杂流型。本文报道了1996年11月阿拉伯海北部与冷涡有关的浮游植物水华，由海洋颜色和温度扫描仪(OCTS)和海景广域视场传感器(SeaWiFS)提取的叶绿素a(以下简称Chl-a)、AVHRR海表面温度(SST)和其他现有的海洋学数据推断出来的。水华出现在阿曼湾(60.5°E，24.5°N)两侧100公里处，水深约3000m，Chl-a浓度斑块最早出现在11月2日，4周后(1996年12月3日)衰减。此次水华的平均Chl-a浓度为6.8mgm−3，并伴随着一个反气旋涡旋的另一个特征，即西南方(61.5°E，22.5°N)有一个反气旋涡旋。海温下降发生在11月14日左右，与由NSCAT得出的风应力得出的垂直抽水速度的峰值重合。1998年11月和1999年11月获得的两幅由SeaWiFS获取的Chl-a图像表明，这些图像的位置和特征与通过海洋海洋观测系统观测到的上述图像非常吻合。对这一新发现的Chl-a补丁的可能机制进行了讨论。
The northern Arabian Sea is a semienclosed sea with high primary productivity and a complicated flow pattern consisting of several eddies. This paper reports on phytoplankton blooms, which were associated with a cold eddy in the northern Arabian Sea during November 1996, inferred from Ocean Color and Temperature Scanner (OCTS) and Sea-view Wide Field-of-view Sensor (SeaWiFS)-derived chlorophyll a (Chl-a hereafter), AVHRR sea surface temperature (SST), and other available oceanography data. The blooms emerged at 100 km from both coasts in the Gulf of Oman (60.5°E, 24.5°N) where the depth is about 3000 m. The Chl-a concentrations patch first appeared on November 2 and decayed after about 4 weeks (December 3, 1996). The high Chl-a concentrations patch was about 100 km in diameter and it was located at 60.3–61.3°E, 23.5–24.5°N. The bloom, having a mean Chl-a concentration of 6.8 mg m−3on November 6, was located in a cold SST eddy, which was accompanied by another feature, an anticyclone eddy (of 100 km in diameter) with high SST and low Chl-a concentrations to the southwest (61.5°E, 22.5°N). An SST drop occurred around November 14, which coincides with a peak of the vertical pumping velocity derived from NSCAT-derived wind stress. Two SeaWiFS-derived Chl-a images obtained in November 1998 and 1999 show good agreement in terms of the locations and features with those described above through the OCTS observations. The possible mechanism for this newly identified Chl-a patch is discussed.