Interdecadal change in the relationship between the NAO and summer rainfall in Northern Central Asia

IF 4.4 2区 地球科学 Q1 METEOROLOGY & ATMOSPHERIC SCIENCES
Yichen Yang , Yong Zhao , Lixia Meng , Ruibo Zhang
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引用次数: 0

Abstract

Based on the Climate Research Unit (CRU) monthly rainfall data and the NationalCenters for Environment Prediction (NCEP)/National Center for Atmospheric Research (NCAR) reanalysis atmospheric circulation data during 1961–2020, we examine the interdecadal change in the relationship between the North Atlantic Oscillation (NAO) and summer rainfall in northern Central Asia (CA). Results show that the NAO negatively (positively) correlates with summer rainfall in northern CA during 1969–1989 (1990–2010), but it becomes obviously closer in the second period, indicating their relationship has experienced a significant interdecadal change over the past 60 years. The varying relationship between the NAO and summer rainfall in northern CA is caused by the interdecadal change in the NAO-related large-scale circulation anomalies. The positive NAOI is well related to the strengthening subtropical westerly jet over CA, an anomalous cyclone over west of CA and southerly wind prevailing over northern CA and convergences of water vapor occupying the whole northern CA, so the relationship between the NAO and summer rainfall in northern CA has become stronger during 1990–2010. Furthermore analysis suggests that the intensity of subtropical westerly jet over CA plays an important role in linking the NAO and summer rainfall in northern CA. In the first period, the atmospheric teleconnection pattern triggered by the NAO only has weak effects on the subtropical westerly jet over CA, but in the second period it can strongly modulate the change in the intensity of subtropical westerly jet over CA.
NAO与中亚北部夏季降水关系的年代际变化
基于1961-2020年气候研究中心(CRU)月降水资料和美国国家环境预测中心(NCEP)/国家大气研究中心(NCAR)大气环流再分析资料,研究了北大西洋涛动(NAO)与中亚北部夏季降水的年代际变化。结果表明:1969—1989年(1990—2010年)NAO与中国北部夏季降水呈负(正)相关,但在第二期(1990—2010年)NAO与夏季降水呈显著的负(正)相关,表明二者的关系在过去60年经历了显著的年代际变化。NAO与中国北部夏季降水的变化关系是由NAO相关大尺度环流异常的年代际变化引起的。正的NAOI与副热带西风急流在中国大陆上空的增强、在中国大陆西部的一个异常气旋、在中国大陆北部盛行的偏南风以及水汽辐合占据整个中国大陆北部有关,因此1990-2010年NAO与中国大陆北部夏季降水的关系变得更强。在第1期,NAO触发的大气遥相关型对副热带西风急流的影响较弱,而在第2期,副热带西风急流对副热带西风急流的强度变化具有强烈的调节作用。
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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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