Effects of the ground surface temperature anomalies over the Tibetan Plateau on the rainfall over northwestern China and western Mongolia in July

Effects of the ground surface temperature anomalies over the Tibetan Plateau on the rainfall over northwestern China and western Mongolia in July
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青藏高原地表温度异常对西北地区和蒙古西部7月份降水的影响

DOI:
10.1007/s00704-017-2298-z
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发表时间:
2018-10
期刊:
Theor Appl Climatol
影响因子:
--
通讯作者:
Jiang Jing
Jiang Jing
中科院分区:
其他
文献类型:
--
作者:
Zhou Yang;Yang Ben;Zhao Yong;Jiang Jing

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利用1980-2012年7月中国气象站资料、GPCP降水资料和ERA-Interim再分析资料,分析了青藏高原地面温度与中国西北部和蒙古西部降水之间的年际负相关关系。利用RegCM4.1在1982-2011年期间进行的模型敏感性实验验证了这一关系。RegCM4.1在TP上的两个关键区域添加了三个不同量级的正/负GTS强迫。其中一个关键区域包括TP的中部和东部(表示为TPC)。另一个覆盖TP的北方和北坡(称为TPN)。模式结果表明,当两个关键区域的GTS距平为负(正)时,西北-西部地区的降水距平为正(负),这与观测结果一致。此外,西北-西部地区的降水异常对TPN地区的GTS异常比TP南部地区的更敏感。模式结果还表明,TPN区的负(正)GTS距平主要导致与降水有关的潜热释放(地面感热)的减少(增加)和下降(上升),而在40° ~ 50° N之间,TPN区北部则上升(下降)。此外,在40°和50° N之间的比湿度增加(减少)。因此,比湿的增加(减少)和40° ~ 50° N的上升(下降)是造成西北偏西地区降水增加(减少)的主要原因。
A significantly negative interannual relationship is identified between the ground surface temperature (GTS) over the Tibetan Plateau (TP) and the rainfall over northwestern China and western Mongolia (NWC-WM) through analyzing the Chinese weather station data, GPCP precipitation, and ERA-Interim reanalysis in July during 1980–2012. This relationship is verified by the model sensitivity experiments carried out by using RegCM4.1 during 1982–2011. The positive/negative GTS forcing of three different magnitudes is added in two key regions over the TP in RegCM4.1. One of the key regions covers the central and eastern TP (denoted as TPC). The other covers the northern and north slope of the TP (denoted as TPN). The model results suggest that when the GTS anomalies in either of the two key regions are negative (positive), the rainfall anomalies over NWC-WM are positive (negative), which is consistent with observations. Furthermore, rainfall anomalies over NWC-WM are more sensitive to the GTS anomalies over the TPN region than those over the southern TP. The model results also reveal that the negative (positive) GTS anomalies over region TPN mainly cause the decrease (increase) of the latent heat release related to rainfall (surface sensible heat) and descent (ascent) over the TPN region but ascent (descent) to the north of the TP between 40° and 50° N. In addition, the specific humidity between 40° and 50° N is increased (decreased). Therefore, the increase (decrease) in specific humidity and the ascent (descent) between 40° and 50° N cause the increase (decrease) in the rainfall over NWC-WM.
DOI: 10.1002/2015jd024591
发表时间: 2016
影响因子: 4.4
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影响因子: 4.9
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