青藏高原雪盖的季节内变化及其影响  

Intraseasonal variability of Tibetan Plateau snow cover and its influence

作　　者：李文铠 郭维栋[2] LI Wenkai;GUO Weidong(Collaborative Innovation Center on Forecast and Evaluation of Meteorological Disasters(CIC-FEMD)/Joint International Research Laboratory of Climate and Environment Change(ILCEC)/Key Laboratory of Meteorological Disaster,Ministry of Education(KLME),Nanjing University of Information Science and Technology,Nanjing 210044,China;School of Atmospheric Sciences,Nanjing University,Nanjing 210023,China)

机构地区：[1]南京信息工程大学气象灾害预报预警与评估协同创新中心/气候与环境变化国际合作联合实验室/气象灾害教育部重点实验室,江苏南京210044 [2]南京大学大气科学学院,江苏南京210023

出　　处：《大气科学学报》2022年第1期1-13,共13页Transactions of Atmospheric Sciences

基　　金：国家自然科学基金资助项目(41905074);第二次青藏高原综合科学考察研究专项(2019QZKK0103);江苏省自然科学基金资助项目(BK20190782)。

摘　　要：回顾了青藏高原雪盖的季节内变化及其影响研究的新进展。高原大部分地区雪盖不稳定且持续时间短,导致高原雪盖具有显著的季节内快速变化特征。局地气温和降水的季节内变化是控制高原雪盖季节内变化的直接原因,这种直接关系是区域大气环流季节内活动的结果。高原雪盖季节内变化还与大尺度大气环流的季节内活动有关,热带季节内振荡、北极涛动和北大西洋涛动引起的大气季节内过程可解释部分高原雪盖季节内变率。高原雪盖季节内变化通过雪-反照率效应迅速对大气施加影响,雪盖造成的冷异常通过大气平流过程影响高原及其下游地区,造成东亚高空急流和东亚大槽增强。由于高原雪盖季节内变化的重要影响,数值预报中高原雪盖的初始场和预报场会影响次季节预报技巧。This paper reviews recent progresses in the study on intraseasonal variability of Tibetan Plateau snow cover(TPSC)and its influence.TPSC is unstable and frequently in short duration.Such unique characteristics may lead to fast variation in TPSC within a seasonal period.Surface air temperature(SAT)and precipitation are factors governing TPSC variation on the intraseasonal time scale.The direct relationships of TPSC with SAT and precipitation are the result of intraseasonal variation in regional atmospheric circulation.The intraseasonal variation of TPSC is also related to the large-scale atmospheric circulation.The Madden-Julian Oscillation,the Arctic Oscillation and the North Atlantic Oscillation can explain some of the intraseasonal variability of TPSC.The atmospheric response to intraseasonal variability of TPSC is rapidly through snow-albedo effect.The intraseasonal variability of TPSC influences regional and downstream atmospheres,which leads to changes in East Asian trough and westerly jet.Such variations of atmosphere result from anomalous thermal advection from the Tibetan Plateau forced by TPSC.Due to the significant influence of intraseasonal variability of TPSC,better TPSC initialization and forecast can improve subseasonal forecast.

关 键 词：陆气相互作用 青藏高原 雪盖 大气季节内变化 次季节预报 

分 类 号：P461[天文地球—大气科学及气象学]