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孙力, 马梁臣, 沈柏竹, 董伟, 隋波. 2010年7~8月东北地区暴雨过程的水汽输送特征分析[J]. 大气科学, 2016, 40(3): 630-646. DOI: 10.3878/j.issn.1006-9895.1506.15101
引用本文: 孙力, 马梁臣, 沈柏竹, 董伟, 隋波. 2010年7~8月东北地区暴雨过程的水汽输送特征分析[J]. 大气科学, 2016, 40(3): 630-646. DOI: 10.3878/j.issn.1006-9895.1506.15101
SUN Li, MA Liangchen, SHEN Baizhu, DONG Wei, SUI Bo. A Diagnostic Study of Water Vapor Transport and Budget of Heavy Rainfall over Northeast China during July to August 2010[J]. Chinese Journal of Atmospheric Sciences, 2016, 40(3): 630-646. DOI: 10.3878/j.issn.1006-9895.1506.15101
Citation: SUN Li, MA Liangchen, SHEN Baizhu, DONG Wei, SUI Bo. A Diagnostic Study of Water Vapor Transport and Budget of Heavy Rainfall over Northeast China during July to August 2010[J]. Chinese Journal of Atmospheric Sciences, 2016, 40(3): 630-646. DOI: 10.3878/j.issn.1006-9895.1506.15101

2010年7~8月东北地区暴雨过程的水汽输送特征分析

A Diagnostic Study of Water Vapor Transport and Budget of Heavy Rainfall over Northeast China during July to August 2010

  • 摘要: 本文根据影响天气系统和雨带位置的不同将2010年7~8月东北地区出现的22个暴雨日划分成了三类暴雨,在以欧拉方法分析了各类暴雨的水汽输送和收支的基础上,利用基于拉格朗日方法的轨迹模式(HYSPLIT v4.9),模拟计算了各类暴雨的水汽输送轨迹、主要通道以及不同源地的水汽贡献。结果表明,影响暴雨的水汽输送通道有三支,一支是沿西太平洋副高边缘东南气流的水汽输送,另一支是起源于南海北部向北偏东气流的水汽输送,第三支是西风带西北气流的水汽输送。第一类暴雨中,来自于西太平洋通道和南海通道的水汽输送大体相当,均很重要,两者可以占总水汽输送的87.4%。第二类暴雨中,水汽输送路径偏东,西太平洋通道的水汽输送贡献可达近70%。第三类暴雨中,虽然西太平洋通道水汽输送仍占主导地位,但北方通道的水汽输送也变得不可忽视。西太平洋通道的水汽沿途损失较小,并主要被输送到东北地区850 hPa及以下的大气之中,而南海通道的水汽沿途损失较多,与北方通道的水汽一样,主要被输送到东北地区850 hPa以上的大气之中。

     

    Abstract: The 22 heavy rain days that occurred over Northeast China during July-August 2010 were divided into three types according to their differences in synoptic system and precipitation area. Based on an analysis of the water vapor transport and budget using a Eulerian method, the characteristics of the major water vapor passages and their contribution ratios to water vapor transportation were studied using NCEP/NCAR reanalysis data and the HYSPLIT v4. 9 model. The results showed that there are three major water vapor passages that act to affect heavy rain over Northeast China. One is the water vapor transport of the southeast moisture current along the edge of the western Pacific subtropical high. Another is the water vapor transport of the southwest moisture current that originates from the north of the South China Sea. And the third is the water vapor transport of the northwest flow, which originates from the westerlies. During the first type of heavy rain, there is little difference in value between the transportation coming from the western Pacific Ocean passage and that from the South China Sea passage;they are both important, and can each account for up to 87. 4% of the total moisture transport. During the second type of heavy rain, the moisture transport path is shifted slightly to the east compared with that of the other types of heavy rain. The water vapor transport of the western Pacific Ocean passage can account for close to 70% of the total transportation. During the third type of heavy rain, the water vapor transport of the northern passage becomes prominent, although the moisture transport of the western Pacific Ocean passage also plays a leading role in the total transportation. The moisture of the western Pacific Ocean passage has smaller losses during transportation and is mainly transported to levels beneath 850 hPa. The moisture of the South China Sea passage has larger losses during transportation and is mainly transported to levels above 850 hPa, as is the moisture of the northern passage.

     

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