Journal of East China Normal University(Natural Sc ›› 2018, Vol. 2018 ›› Issue (1): 146-153,170.doi: 10.3969/j.issn.1000-5641.2018.01.014

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Analysis of characteristics of the cold water patch off the Jiangsu coast in summer 2016

HE Zhan-yuan1, ZHANG Wen-jing2, ZHU Shou-xian1, CHEN Yang1, ZHENG Hou-jun1   

  1. 1. College of Oceanography, Hohai University, Nanjing 210098, China;
    2. College of Meteorology and Oceanography, National University of Defense Technology, Nanjing 211101, China
  • Received:2017-02-27 Online:2018-01-25 Published:2018-01-11

Abstract: In this paper, the analysis of characteristics of a cold water patch (CWP) off the Jiangsu coast is carried out based on in-situ oceanographic observations using CTD and remote sensing data made by the Advanced Very High Resolution Radiometer (AVHRR)in the period of summer 2016 from June to Augst. Analysis of the CTD data demonstrates that relatively cold waters occurred at different depths from the sea surface to 30 m over the study region in summer 2016, with the center of the cold waters leaning to the east at deeper depth. This confirms the transportation of cold subsurface waters from the bottom of the Yellow Sea to the Jiangsu coast. The distributions of monthly averaged AVHRR Sea Surface Temperature (SST) demonstrate the existence of CWP, the radius of which varies from 67.9 km to 85.8 km, the intensity from 0.5℃ to 1.2℃, the temperature difference between the CWP center and the coast at the same latitude from 1.9℃ to 2.9℃. The daily distribution of SST indicates that there are 78 days existing CWP, among which the maximum radius is 161.8 km, the maximum intensity is 2.8℃, the maximum temperature difference is 5.9℃. The daily position of CWP center ranges in a large area, the longest distance between two adjacent days is 125.4 km. The effect of the surface wind forcing on the cold water area is also examined using a correlation analysis of the estimated radius and intensity of the CWP with surface winds, which came to a conclusion the southerly wind plays an important role in developing the CWP.

Key words: Jiangsu coast, cold water patch, observation, AVHRR, wind field

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