青藏高原感熱通量的變化及與江淮流域降水異常的關系

doi:10.3969/2014jms.0081

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青藏高原感熱通量的變化及與江淮流域降水異常的關系
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                        10.3969/2014jms.0081
                    
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基金項目:中國氣象局成都高原氣象研究所開放基金項目(LPM2009015);浙江省氣象科技計劃項目(2014ZD06-3);寧波市氣象科技計劃項目(NBQX2014010B)

Variability of sensible heat flux in Tibetan Plateau and its relation with precipitation anomaly in Changjiang-Huaihe River valley

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利用1979—2010年NCEP-R2再分析資料和全國586站降水資料, 對青藏高原感熱通量進行小波變換和EOF分析, 并研究了它與江淮流域降水的關系。結(jié)果發(fā)現(xiàn):高原感熱通量具有2 a和8 a的變化周期?？臻g分布上主要有東、西反相變化和南、北反相變化以及全區(qū)一致性變化3種形態(tài)。高原感熱通量與江淮流域降水異常的同期相關中, 1998年以來, 春季高原東部的感熱通量偏小, 其他地區(qū)偏大, 與此同期江淮流域降水偏少;夏季西藏西部的感熱通量偏小, 其他地區(qū)偏大, 與此同期江淮流域降水偏多。兩者超前相關中, 江淮流域降水對春季的感熱通量變化最敏感。1998年以來, 當春季高原東南部的感熱通量偏小, 其他地區(qū)偏大時, 江淮流域的夏季降水偏多, 秋季降水偏少;當春季高原感熱通量東部偏小, 西部偏大時, 江淮流域的冬季降水以長江為界南多北少, 次年春季降水偏少。

Abstract:

The NCEP-R2 reanalysis data and precipitation data from 586 stations in China during 1979-2010 were selected to apply wavelet transform and EOF analysis to the variability of the sensible heat flux in the Tibetan Plateau (TP) and its relation with the precipitation anomaly in the Changjiang-Huaihe River valley (CHRV). Results show that three variation patterns of sensible heat flux with principal variation periods of 2 years and 8 years exist in the TP:east-west inverted change, south-north inverted change and all region consistent change. The contemporaneous correlation between the variation of sensible heat flux in the TP and precipitation anomaly in the CHRV indicates that since 1998, when the sensible heat flux in eastern TP in spring belongs to a smaller value, but still assumes to be greater than that in other areas, the CHRV is drier at the same period; when the sensible heat flux in western Tibet in summer is smaller, but it is still bigger than that in other areas, the CHRV is wetter at the same period. The precipitation over the CHRV is more sensitive to the variation of sensible heat flux in spring in the leading correlation. Since 1998, when the sensible heat flux in southeastern TP in spring is smaller, but it is still bigger than that in other areas, the CHRV is wetter in summer but drier in autumn; when the sensible heat flux is smaller in eastern TP but bigger in west in spring, South Changjiang River is wetter and the north is drier in winter while the CHRV is drier in next spring.

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顧思南,房佳蓓,劉建勇.青藏高原感熱通量的變化及與江淮流域降水異常的關系.氣象科學,2015,35(3):305-311 GU Sinan, FANG Jiabei, LIU Jianyong. Variability of sensible heat flux in Tibetan Plateau and its relation with precipitation anomaly in Changjiang-Huaihe River valley. Journal of the Meteorological Sciences,2015,35(3):305-311

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收稿日期:2014-05-19
最后修改日期:2014-08-03
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在線發(fā)布日期: 2015-07-03
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