Climatological Characteristics of Summertime Moisture Budget over the Southeast Part of Tibetan Plateau with Their Impacts

Shi Xiaoying; Shi Xiaohui

Vol.19, NO.1, 2008

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Shi Xiaoying, Shi Xiaohui. Climatological characteristics of summertime moisture budget over the southeast part of Tibetan Plateau with their impacts. J Appl Meteor Sci, 2008, 19(1): 41-46.

Citation:

Shi Xiaoying, Shi Xiaohui. Climatological characteristics of summertime moisture budget over the southeast part of Tibetan Plateau with their impacts. J Appl Meteor Sci, 2008, 19(1): 41-46.

Shi Xiaoying, Shi Xiaohui. Climatological characteristics of summertime moisture budget over the southeast part of Tibetan Plateau with their impacts. J Appl Meteor Sci, 2008, 19(1): 41-46.

Citation:

Shi Xiaoying, Shi Xiaohui. Climatological characteristics of summertime moisture budget over the southeast part of Tibetan Plateau with their impacts. J Appl Meteor Sci, 2008, 19(1): 41-46.

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Climatological Characteristics of Summertime Moisture Budget over the Southeast Part of Tibetan Plateau with Their Impacts

Shi Xiaoying^1,2,
Shi Xiaohui¹

1.
State Key Laboratory of Severe Weather, Chinese Academy of Meteorological Sciences, Beijing 100081
2.
Graduate University of Chinese Academy of Sciences, Beijing 100039

Received Date: 2007-02-09
Rev Recd Date: 2007-08-02
Publish Date: 2008-02-29

Abstract

Abstract

Climatological characteristics of water vapor budget over the southeast part of Tibetan Plateau and their impacts on ambient areas in summer are investigated based on NCEP/NCAR reanalysis data for the period from 1961 to 2005. The result shows that the southeast part of Tibetan Plateau is a moisture sink, under the seasonal average of summer condition, the water vapor net budget is 39.9×10⁶ kg/s. The establishment and advance of Asian summer monsoon play an important role in the incoming water vapor of the southeast part of Tibetan Plateau, and the outgoing moisture is closely associated with the advance and retreat of rain belt of East China. The southeast part of Tibetan Plateau, as the moisture transport channel to the east of Northwest China and mid-lower reaches of the Yangtze River, plays a great role in the moisture budget around it. The southeast part of Tibetan Plateau, as a transferring station, is one of the key factors to the flooding anom alies of precipitation in mid-lower reaches of the Yangtze River and the drought anomalies in North China. By power spectrum analysis, it is found that there is quasi-biennial oscillation in the interannual variations of moisture budgets at east/north boundary over the southeast part of Tibetan Plateau and summer precipitation of mid-lower reaches of the Yang tze River/eastern part of Northwest China. An in-phase inter-annual variation are shown by the moisture budgets at east boundary over the southeast part of Tibetan Plateau and the summer precipitation of mid-lower reaches of the Yangtze River, and the same to moisture budgets at north boundary and the summer precipitation of eastern part of Northwest China.It shows that the quasi-biennial oscillation of moisture budgets at east boundary is closely association with that of precipitation in mid-lower reaches of the Yangtze River, and the quasi-biennial oscillation of moisture budgets at north boundary is closely association with that of precipitation of the eastern part of Northwest China.
- the southeast part of Tibetan Plateau;
- water vapor budget;
- summer precipitation

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References(22)

Figures and Tables

图 1 高原东南部、长江中下游、西北地区东部区域示意图

Fig. 1 Schematic diagram of the southeast part of Tibetan Plateau, mid-lower reaches of the Yangtze River and the eastern part of Northwest China

DownLoad: Full-Size Img PowerPoint

图 2 高原东南部气候平均4—8月逐候水汽收支演变

Fig. 2 Duration curves of climatological mean water vapor budget over the southeast part of Tibetan Plateau from April to August

DownLoad: Full-Size Img PowerPoint

图 3 长江中下游旱涝年合成500 hPa差值风场分布 (单位: m/s)

Fig. 3 Difference of composed 500 hPa winds for flooding years from those for drought years of the mid-lower reaches of the Yangtze River (unit:m/s)

DownLoad: Full-Size Img PowerPoint

图 4 高原东南部东边界 (a) 及北边界 (b) 水汽收支与我国夏季降水的相关分布

(浅、深阴影分别为超过90%信度检验的负、正相关区域)

Fig. 4 Correlation fields of moisture budget at east (a) and north (b) boundary over the southeast part of Tibetan Plateau with precipitation of China in summer

(negative/positive correlations over 90% level are lightly/heavily shaded, respectively)

DownLoad: Full-Size Img PowerPoint

图 5 夏季高原东南部东边界 (a) 和北边界 (b) 水汽收支的功率谱

(虚线为α=0.05的白噪音标准谱)

Fig. 5 Power spectrum of moisture budget at east (a) and north (b) boundary over southeast part of Tibetan Plateau in summer

(dashed line denotes the standard spectrum of white noise at α=0.05)

DownLoad: Full-Size Img PowerPoint

表 1 高原东南部、长江中下游以及西北地区东部侧边界水汽收支及区域总收支 (单位:10⁶ kg·s^-1)

Table 1 Budgets of four boundaries and the corresponding regional total budgets over the southeast part of Tibetan Plateau, mid-lower reaches of Yangtze River and the eastern part of Northwest China (unit:10⁶ kg·s^-1)

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