中亚塔里木盆地春季降水异常的主要模式和环流特征

IF 4.5 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Dilinuer Tuoliewubieke , Junqiang Yao , Weiyi Mao , Ping Chen , Liyun Ma , Jing Chen , Shujuan Li
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引用次数: 0

摘要

近来,生态环境脆弱的塔里木盆地极端降水频发,引起了广泛关注。本研究利用1980-2021年春季塔里木盆地42个站点的日降水量观测资料和欧洲中期天气预报中心再分析V5版的月环流再分析资料,以及统计分析和物理诊断方法,研究了大气环流的异常模式和演变特征及差异。结果表明,塔里木盆地的春季降水异常可分为两种独立的降水模式:第一种(EOF1)是整个区域均匀的降水模式,第二种(EOF2)是东西向的反向模式。因此,造成盆地春季异常降水模式的大气环流特征存在明显差异。当整个盆地降水持续过多时,500 hPa 的位势高度受到北大西洋涛动相关环流负相的影响,500 hPa 的异常负位势高度和 700 hPa 的异常气旋控制着整个塔里木盆地,有利于异常上升运动,以及西部和西南部的水汽输送。这使得塔里木盆地的水汽预算为净水汽,大气可降水量异常高。当整个盆地的降水量持续低于正常水平时,就会出现相反的情况。当出现自西向东的降水梯度时,塔里木盆地西部受到异常气旋的影响,而东部则受到异常反气旋的影响,从而导致东西差异。塔里木盆地西部地区以上升气流为主,而东部地区则以下降气流为主,这就为西向东的降水梯度提供了动态条件。在来自西南的异常水汽输送和水汽辐合的影响下,会出现有利于降水的水汽条件。盆地内的净水汽也呈现出异常的西向东输送模式。此外,在塔里木盆地的 EOF2 大气降水模式下,大气可降水量呈现反相分布。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Dominant spring precipitation anomaly modes and circulation characteristics in the Tarim Basin, Central Asia
Recently, extreme precipitation has occurred frequently in the Tarim Basin, which has a fragile ecological environment, arousing widespread concern. Using daily precipitation observations from 42 stations in the Tarim Basin during the spring of 1980–2021 and monthly circulation reanalysis data from the European Center for Medium-Range Weather Forecasts Reanalysis v5, as well as statistical analyses and physical diagnostic methods, this study investigated the abnormal modes and the evolution characteristics and differences in atmospheric circulation. The results show that the spring precipitation anomalies in the Tarim Basin can be divided into two independent precipitation modes: the first (EOF1) is a precipitation pattern that is uniform throughout the region and the second (EOF2) is an east–west inverse pattern. Thus, there are distinct differences in the atmospheric circulation characteristics responsible for abnormal spring precipitation modes in the basin. When the precipitation across the entire basin is consistently excessive, the 500 hPa geopotential height is affected by the negative phase of the North Atlantic Oscillation related circulation, and anomalous negative geopotential height at 500 hPa and anomalous cyclone at 700 hPa control the entire Tarim Basin, favoring anomalous upward motion, and western and southwestern water vapor transport. This leaves the Tarim Basin with a net water vapor budget and abnormally high atmospheric precipitable water. The opposite situation occurs when the precipitation across the entire basin is consistently lower than normal. When there is a west-to-east precipitation gradient,  the western part of the Tarim Basin is affected by the anomalous cyclone while the eastern part is affected by the amomalous anticyclone, leading to the east-west discrepancy. The western region of the Tarim Basin is dominated by upward airflow, whereas the eastern region is dominated by downward airflow, providing dynamic conditions for the west-to-east precipitation gradient. Under the influence of anomalous water vapor transport from the southwest and water vapor convergence, water vapor conditions favorable for precipitation can occur. The net water vapor in the basin also exhibited an abnormal west-to-east transport pattern. Moreover, the atmospheric precipitable water demonstrated an inverse phase distribution under the EOF2 atmospheric precipitation mode in the Tarim Basin.
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来源期刊
Atmospheric Research
Atmospheric Research 地学-气象与大气科学
CiteScore
9.40
自引率
10.90%
发文量
460
审稿时长
47 days
期刊介绍: The journal publishes scientific papers (research papers, review articles, letters and notes) dealing with the part of the atmosphere where meteorological events occur. Attention is given to all processes extending from the earth surface to the tropopause, but special emphasis continues to be devoted to the physics of clouds, mesoscale meteorology and air pollution, i.e. atmospheric aerosols; microphysical processes; cloud dynamics and thermodynamics; numerical simulation, climatology, climate change and weather modification.
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