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Lanzhou University (2021)

Characteristics and Formation Mechanism of Summer Extreme Precipitation in the Qaidam Basin

吕春艳

Titre : Characteristics and Formation Mechanism of Summer Extreme Precipitation in the Qaidam Basin

Auteur : 吕春艳

Grade : Master 2021

Université : Lanzhou University

Résumé partiel
The Qaidam Basin(QB),as the largest alpine arid inland basin in China,lies in the northeastern Tibetan Plateau and the northwest China.It is not only a sensitive area for climate change but also a fragile zone for ecological environment.The frequency of precipitation and extreme precipitation events here occurs rarely compared with eastern China,however,understanding the local characteristics and physical processes of extreme precipitation in the QB is full of meaning to the natural ecosystem and economic construction in the arid region.This paper focuses on the study of the temporal-spatial distribution characteristics of summer extreme precipitation in the QB and corresponding characteristics of atmospheric circulation and water vapor transport during 1981~2017.And quantitatively analyzes the changes of key weather systems and water vapor transport at the four boundaries of the basin during extreme precipitation.In addition,the physical mechanisms of the atmospheric apparent heat source affecting extreme precipitation in the QB is investigated.Finally,the impact of the synoptic-scale transient eddy activity on the formation and evolution of blocking circulation is investigated through two types of typical blocking high events associated with summer extreme precipitation in the QB,and the possible relationship between the synoptic-scale transient eddy activity and the summer extreme precipitation in the QB is discussed further.

Mots clés : Qaidam Basin ;summer extreme precipitation ;water vapor transport ;atmospheric apparent heat source ;synoptic-scale transient eddies ;

Présentation (CNKI)

Page publiée le 12 mars 2022