Upwelling in the Taiwan Strait during the summer monsoon detected by satellite and shipboard measurements
Upwelling in the Taiwan Strait during the summer monsoon detected by satellite and shipboard measurements
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DOI：
10.1016/s0034-4257(02)00062-7
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发表时间：
2002-12
影响因子：
13.5
通讯作者：
D. Tang;D. R. Kester;I. Ni;H. Kawamura;H. Hong
中科院分区：
文献类型：
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作者：
D. Tang;D. R. Kester;I. Ni;H. Kawamura;H. Hong
台湾海峡位于西太平洋东中国海和南中国海的交汇处。台湾海峡的几个上升区以渔业产量高而闻名；过去十年来，人们对这些上升区进行了研究，但由于只有很短时间的有限现场观测，我们没有这些上升区的大小和时间变化的总体情况。本文利用NOAA卫星遥感海表面温度(SST)和SeaWiFS叶绿素a(Chl-a)卫星遥感资料和船载观测资料，对1998年夏季台湾海峡的上升流进行了研究。结果表明：(1)平潭岛附近的沿岸上升流(PTU)，(2)湄洲至厦门之间的沿岸上升流(MXU)，(3)东山岛附近的大上升流(DSU)，有时延伸到近海，(4)澎湖岛附近的小而偶然的上升流(PhU)，(5)台湾浅滩(TBU)的强烈上升流。1998年夏天，人们对TBU进行了广泛的研究。结果显示，台湾浅滩南缘的热带气旋形似香蕉，东南缘则加强。TBU大小约2500~3000 km2，平均2796 km2。8月上旬，上升区与非上升区之间的温差约为2.5~3.5℃，7~10月平均为2.3℃。一系列图像显示了总有机碳的短期变化，并表明高Chl-a浓度区(高达0.8mgm−3)与低海表温度区(25-26℃)在位置、时间和形状上是一致的。这些上升流带随着大小和强度中心的变化而变化。1998年现场测量的水温、盐度和Chl-a与卫星测量结果一致。
The Taiwan Strait is located at the confluence of the East China Sea and the South China Sea in the west Pacific Ocean. Several upwelling zones in the Taiwan Strait are noted for their high fisheries production; these upwelling zones have been studied in the past decade, but we have no overall picture on the size and temporal changes of these upwelling zones due to only limited in situ observation over short periods of time. The present paper investigates upwelling in the Taiwan Strait with satellite remote sensing data of NOAA-derived Sea Surface Temperature (SST) and SeaWiFS-derived Chlorophyll-a (Chl-a) and shipboard measurements during summer 1998. Results reveal five upwelling zones: (1) coastal upwelling near Pingtan Island (PTU), (2) coastal upwelling between Meizhou and Xiaman (MXU), (3) big coastal upwelling near Dongshan Island (DSU), sometimes extending to offshore, (4) small occasional upwelling near the Penghu Island (PHU) and (5) an intensive upwelling in the Taiwan Bank (TBU). TBU was extensively studied over summer 1998. Results showed that the TBU looks like a banana in shape in the southern edge of the Taiwan Bank; it intensifies in its southeastern edge. The size of TBU was about 2500–3000 km2, with a mean value of 2796 km2. The temperature difference between the upwelling and non-upwelling areas was about 2.5–3.5 °C for early August with a mean value of 2.3 °C on July to October. Series of images indicated a short-term variation of TBU and showed that high Chl-a concentrations (up to 0.8–2 mg m−3) zones coincided with low SST (25–26 °C) zones in terms of location, time, and shape. These upwelling zones change with size and intensity center from time to time. Field measurements of water temperature, salinity, and Chl-a in 1998 are consistent with satellite measurements.