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浙江沿岸水对“魔蝎”台风的响应
陶宇
浙江海测科技有限公司
摘要:
台风“魔蝎”于2018年8月12日夜晚登陆浙江温岭,登陆前后带来了浙江近海海水物理特性的诸多变化。台风登陆时的最大风速27.5m/s,且正值天文大潮期间,引起了超过0.30m的沿岸增水,增水持续了3~4天。在台风登陆前的7小时内,锚系点水温降幅超过1℃,海气热交换引起的海水热量损失是水温降低的主要因素,而海水垂向混合带来的海水降温幅度有限。降温在水平区域分布上具有不对称性,降温中心呈现明显的右偏性,台风路径右侧的水温降幅明显强于路径左侧。长江口外至苏南外海水温降幅最为明显,最大降温接近3℃,舟山东南方向海域和温岭东南方向海域最大降温分别超过1.6℃和1.2℃,而在台风路径左侧海域,水温降幅普遍小于1℃。在台风登陆前的7小时内,海水盐度降低了1.2,台风带来的强降雨是海水盐度降低的主要因素。
关键词:  浙江沿岸水  台风  风暴潮增水  SST  锚系观测
DOI:10.11759/hykx20191015001
分类号:
基金项目:
Response of Zhejiang coastal water to typhoon
TAO Yu
Zhejiang Ocean Surveying and Mapping Technology Co., Ltd.
Abstract:
Typhoon "Yagi" landed in Wenling, Zhejiang Province on the night of August 12, 2018. Before and after landing, it brought many changes in the physical characteristics of the coastal waters of Zhejiang Province. As the typhoon landing, the maximum wind speed was 27.5m/s, and meeting the period of spring tide, caused the coastal water increase of more than 0.30m, which lasted for 3-4 days. Within seven hours before the typhoon landed, the temperature of the mooring point dropped by more than 1℃. The heat loss of sea water caused by air-sea heat exchange was the main factor for the decrease of water temperature, while the cooling of sea water caused by vertical mixing was limited. The horizontal distribution of water cooling was asymmetric, showed obvious right-side deviation. The temperature drop on the right side of the typhoon track was obviously stronger than that on the left side of the track. The maximum temperature drop from the Yangtze Estuary to the south of Jiangsu Province was close to 3 C. The maximum temperature drop in the south of Zhoushan Mountains and southeast of Wenling exceeded 1.6℃ and 1.2℃, respectively. In the left side of the typhoon track, the water temperature drop was generally less than 1℃. In the seven hours before typhoon landing, the salinity of sea water decreased by 1.2. The heavy rainfall caused by typhoon is the main factor of the salinity reduction of sea water.
Key words:  Zhejiang coastal water  typhoon  storm surge water enhancement  SST  mooring observation
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