高级检索
李亚云, 杨莲梅, 成巍, 等. 2024. 1979~2017年冬季新疆北部各区域型暴雪日水汽输送特征分析[J]. 大气科学, 48(2): 1−12. doi: 10.3878/j.issn.1006-9895.2204.21137
引用本文: 李亚云, 杨莲梅, 成巍, 等. 2024. 1979~2017年冬季新疆北部各区域型暴雪日水汽输送特征分析[J]. 大气科学, 48(2): 1−12. doi: 10.3878/j.issn.1006-9895.2204.21137
LI Yayun, YANG Lianmei, CHENG Wei, et al. 2024. A Diagnostic Study of Water Vapor Transport and Budget during Wintertime Snowstorm Days over Different Regions of Northern Xinjiang during 1979–2017 [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 48(2): 1−12. doi: 10.3878/j.issn.1006-9895.2204.21137
Citation: LI Yayun, YANG Lianmei, CHENG Wei, et al. 2024. A Diagnostic Study of Water Vapor Transport and Budget during Wintertime Snowstorm Days over Different Regions of Northern Xinjiang during 1979–2017 [J]. Chinese Journal of Atmospheric Sciences (in Chinese), 48(2): 1−12. doi: 10.3878/j.issn.1006-9895.2204.21137

1979~2017年冬季新疆北部各区域型暴雪日水汽输送特征分析

A Diagnostic Study of Water Vapor Transport and Budget during Wintertime Snowstorm Days over Different Regions of Northern Xinjiang during 1979–2017

  • 摘要: 北疆地处内陆干旱半干旱区,降水的多少对其影响十分巨大。尤其在全球变暖背景下,北疆地区的降水异常增多。本研究利用1979~2017年北疆40个站点冬季降水资料、ECMWF ERA-Interim和NCEP/NCAR再分析资料,基于HYSPLIT v4.9模式讨论北疆4个区域型暴雪日的水汽输送特征及可能影响机制。研究发现:(1)各区域型水汽以西边界输入为主,但西天山型有少量水汽从北边界输入,天山型有部分水汽从南边界高层输入;(2)北部型、西部型和西天山型的水汽通道均位于中纬西风带,但具体位置有所差异。北部型以地中海和黑海水汽输送为主,贡献率为58.8%;西部型以里海西南侧水汽输送为主,贡献率为70.8%;西天山型以黑海和里海东南侧水汽输送为主,总贡献率为72.9%;天山型的水汽源地主要位于印度、伊朗附近,贡献率为64.2%;(3)各区域型位势高度的距平南北均呈现“正—负”分布,西东均呈现“负—正—负”分布,但中心强度、位置及范围有所不同,这种差异导致影响区域的不同。

     

    Abstract: China’s northern Xinjiang is located in a typical inland arid and semiarid area where anomalous precipitation plays a significant role. In recent years, anomalous precipitation events have increased with the increase in global temperatures. In this study, the interdecadal variability of wintertime precipitation in northern Xinjiang is investigated using the observational rainfall data of 40 stations and the ECMWF ERA-Interim and NCEP/NCAR reanalysis datasets for 1979–2017. This study discusses the water vapor transport characteristics of wintertime snowstorm days and the possible mechanisms in four regions based on the HYSPLIT v4.9 model. Our main results are as follows: (1) The west boundary input of water vapor is mainly in each region, but a small amount of water vapor is imported from the northern boundary in western Tianshan, and some water vapor is imported from the southern boundary in the upper part of Tianshan. (2) The water vapor passages are mainly located in Eurasia, with the mid-latitude westerlies in the north, west, and western Tianshan; however, their exact locations are different. The water vapor transport mainly comes from the Mediterranean and the Black Sea in the north, with a contribution ratio of 58.8%; southwest of the Caspian Sea in the west, with a contribution ratio of 70.8%; the Black Sea and the southeast of the Caspian Sea in western Tianshan, with a contribution ratio of 72.9%; and India and Iran, with a contribution ratio of 64.2%. (3) The geopotential height anomaly shifts from “+” to “−” from south to north and from “−” to “+” and back to “−” from west to east in the different regions; however, the intensity, range, and location of the anomaly center are different, leading to differences in the influential regions.

     

/

返回文章
返回