Current characteristics and vertical variations during summer and autumn in the southern East China Sea were investigated by measuring current profile, tide, wind, and wave data for 90 d from July 28 to October 25, 20...Current characteristics and vertical variations during summer and autumn in the southern East China Sea were investigated by measuring current profile, tide, wind, and wave data for 90 d from July 28 to October 25, 2015. Our results are:(1) The current was mainly a(clockwise) rotating flow, displaying reciprocating flow characteristics,and vertically the current directions were the same throughout the vertical profile.(2) The horizontal current speed was strongest during August(summer) with an average speed of 51.8 cm/s. The average current speeds during spring tides were highest in August and weakest in September, with speeds of 59.9 and 42.8 cm/s,respectively.(3) Considerable differences exist in average current speeds in different layers and seasons. The highest average current speeds were found in the middle–upper layers in August and in the middle–lower layers in September and October.(4) The residual current speed was highest in August, when the speed was 12.5–47.1 cm/s,whereas the vertical average current speed was 34.3 cm/s. The depth-averaged residual current speeds in September and October were only 50% of that in August, and the residual current direction gradually rotated in a counter-clockwise direction from the lower to surface layers.(5) Typhoon waves had a significant influence on the currents, and even affected the middle and lower water layers at depths of >70.0 m. Our results showed that the currents are controlled by the dynamic interplay of the Taiwan Warm Current, incursion of the Kuroshio Current onto the continental shelf, and monsoonal changes.展开更多
利用常规气象观测资料和再分析资料,采用中尺度分析和物理量诊断方法,对2014年9月持续13 d的连阴雨天气成因进行分析。结果表明,500 h Pa中高纬度大气环流不断经向发展,脊前的西北气流为连阴雨提供了冷空气,副高和台风"海鸥"...利用常规气象观测资料和再分析资料,采用中尺度分析和物理量诊断方法,对2014年9月持续13 d的连阴雨天气成因进行分析。结果表明,500 h Pa中高纬度大气环流不断经向发展,脊前的西北气流为连阴雨提供了冷空气,副高和台风"海鸥"相继为四川盆地输送暖湿空气;中低层出现西南涡和切变线,有利于降水产生;前期由副高边缘提供水汽输送,动力热力条件较好,产生较强的不稳定性降水;后期由台风外围云系输送水汽,水汽条件相当,但动力热力条件较差,产生较弱的稳定性降水。展开更多
基金The National Key Research and Development Program of China under contract No. 2016YFC1401207the National Natural Science Foundation of China under contract No. 41625021the Natural Science Foundation of Jiangsu Province under contract No. BK20170953.
文摘Current characteristics and vertical variations during summer and autumn in the southern East China Sea were investigated by measuring current profile, tide, wind, and wave data for 90 d from July 28 to October 25, 2015. Our results are:(1) The current was mainly a(clockwise) rotating flow, displaying reciprocating flow characteristics,and vertically the current directions were the same throughout the vertical profile.(2) The horizontal current speed was strongest during August(summer) with an average speed of 51.8 cm/s. The average current speeds during spring tides were highest in August and weakest in September, with speeds of 59.9 and 42.8 cm/s,respectively.(3) Considerable differences exist in average current speeds in different layers and seasons. The highest average current speeds were found in the middle–upper layers in August and in the middle–lower layers in September and October.(4) The residual current speed was highest in August, when the speed was 12.5–47.1 cm/s,whereas the vertical average current speed was 34.3 cm/s. The depth-averaged residual current speeds in September and October were only 50% of that in August, and the residual current direction gradually rotated in a counter-clockwise direction from the lower to surface layers.(5) Typhoon waves had a significant influence on the currents, and even affected the middle and lower water layers at depths of >70.0 m. Our results showed that the currents are controlled by the dynamic interplay of the Taiwan Warm Current, incursion of the Kuroshio Current onto the continental shelf, and monsoonal changes.
文摘利用常规气象观测资料和再分析资料,采用中尺度分析和物理量诊断方法,对2014年9月持续13 d的连阴雨天气成因进行分析。结果表明,500 h Pa中高纬度大气环流不断经向发展,脊前的西北气流为连阴雨提供了冷空气,副高和台风"海鸥"相继为四川盆地输送暖湿空气;中低层出现西南涡和切变线,有利于降水产生;前期由副高边缘提供水汽输送,动力热力条件较好,产生较强的不稳定性降水;后期由台风外围云系输送水汽,水汽条件相当,但动力热力条件较差,产生较弱的稳定性降水。