2013年浙江夏季异常高温及环流特征分析
Analysis on Characteristic and Cause of Abnormal High Temperature in Summer of 2013 in Zhejiang
中文摘要：
利用NCEP/NCAR再分析格点资料、NOAA海温资料、浙江省常规气象观测资料等，对浙江省高温天气气候特点及2013年异常高温情况进行研究分析，以期为今后的高温预报服务提供科学依据和理论基础。结果表明：浙江省高温日数以7月最多、8月次之；空间分布上呈西多东少、内陆多沿海少的特点；2013年盛夏浙江省出现近60余年最严重的高温热浪少雨天气，高温日数异常偏多（7、8月分别比常年多出7和6d），部分市县极端最高气温屡破历史纪录；在2013年浙江盛夏高温期间，北半球大气环流明显异常、极地低涡受阻不能南下、西太平洋副热带高压稳定偏强、冷空气过程时间短强度弱、台风北上活动影响少、中低层有深厚的暖脊并盛行强的下沉气流。
中文关键词：
高温，副热带高压，暖脊，下沉气流，环流特征
KeyWords：
high temperature, subtropical high, the warm ridge, the downdraft, characteristics of atmospheric circulation
Abstract：
Based on the datasets from the NCEP/NCAR reanalysis, NOAA-SST dataset, the Zhejiang conventional observation data, the climate characteristics high temperature weather and the high temperature physical cause of 2013 in Zhejiang were explored in this study. The results show that high temperature days of Zhejiang appeared most frequently in July, followed by August. There were more high temperature days in the west region and less ones in the east coast. In the summer of 2013, large sections of Zhejiang Province were hit by heat wave and less rain. It’s the worst heat wave in recent 60 years. The high temperature days of Zhejiang in the summer of 2013 were much more than those in the summer of the perennial average. The history records of extreme maximum temperature were broken in few cities and countries frequently. Further evidence shows that the Northern Hemisphere atmospheric circulation anomaly, polar low eddy blocked in the polar region, Northwest Pacific subtropical high remained so stable and so long, the weak cold advent that those processes tended to be short duration and limited strengthness, the less influence by northward landfall typhoon, the warm-deeply ridge, the downdraft at middle and low layer during the period of the summer continuous high temperature in 2013.