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Comparative Analysis of Extreme High Temperature Weather in the Summers of 2013 and 2003

机译：2013年与2003年夏季极端高温天气的对比分析

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摘要

The characteristics of regional high temperature (HT) weather in 2013 and 2003 and their causes were studied using daily maximum temperature data, National Center for Environmental Prediction (NCEP) re-analysis data, and outgoing longwave radiation (OLR) data. For these two years of HT weather, there were many similar characteristics, such as their long duration, wide range, high intensity, and severe influence. However, there were also three obvious differences: firstly, in 2013, the major area where HT weather occurred was farther north than in 2003; secondly, the HT weather in South China and the southeast area of Jiangnan in 2013 lasted fewer days than in 2003, but in other areas it lasted for more days than in 2003; thirdly, the intensity of the HT weather in 2013 was also stronger in the north and weaker in the south, similar to that of the duration. A strong and stable western Pacific subtropical high (WPSH), a continental warm high, and the distribution of the warm center in the lower troposphere played important roles in the HT weather formation. Several probable causes for the differences are that the cold air was weaker, the WPSH was farther north, and the tropical convective systems were stronger in 2013 than in 2003. Finally, a preliminary cause analysis of the WPSH anomaly was presented.
机译：使用每日最高温度数据，国家环境预测中心（NCEP）重新分析数据和外向长波辐射（OLR）数据，研究了2013年和2003年区域高温（HT）天气的特征及其成因。在这两年的高温天气中，有许多相似的特征，如持续时间长，范围广，强度大和影响严重。但是，这里也存在三个明显的差异：首先，2013年，高温天气发生的主要地区比2003年更北。其次，2013年华南和江南东南地区的高温天气持续时间少于2003年，而其他地区的高温天气持续时间则比2003年更长。第三，2013年高温天气的强度在北部也较强，在南部较弱，与历时相似。西太平洋副热带高压（WPSH）的强而稳定，大陆性的暖高以及对流层低层暖中心的分布在高温天气形成中起着重要作用。造成这种差异的几种可能原因是，2013年的冷空气较弱，WPSH偏北，热带对流系统的强度比2003年强。最后，对WPSH异常进行了初步原因分析。

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