Study of Cryosphere, Atmosphere, Ocean Interaction in the Global Climate System

全球气候系统中冰冻圈、大气、海洋相互作用研究

基本信息

批准号：
01460055
负责人：
YASUNARI Tetsuzo
金额：
$ 2.18万
依托单位：
Institute of Geoscience, University of Tsukuba
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1989
资助国家：
日本
起止时间：
1989 至 1991
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-01460055/
关键词：
Monsoon Enso Q^<13>O Climate System Atmosphere Ocean Interaction Cryosphere Interaction El Nino ENSO 大気・海洋担互作用雪氷大気海洋 ABO 担互作用 QBO

项目摘要

The role of the Asian summer monsoon on the interannual variability of the global climate system particularly relevant to the ENSO time scales is discussed, by examining the statistical and dynamical links between the Asian summer monsoon, the atmosphere/ocean system in the tropics and the westerly flow regimes in the extratropics.The Asian monsoon, the ocean and the atmosphere in the tropical Pacific are tightly linked together as one climate system, named here as the MAOS (Monsoon and the Coupled Atmosphere/Ocean System). The MAOS prominently shows the biennial oscillatory nature which tends to have anomalous states starting in the northern summer monsoon season and persisting for about one year (Yasunari, 1990a : 1991).The anomalous state of the MAOS produces the anomalous atmospheric circulation over the subtropics and the extratropics of the north Pacific during summer through the early winter, through the modulation of the subtropical high and the stationary Rossby wave propagati … More on mechanism. In the mid winter, this anomalous circulation over the north Pacific is evolved to the hemispheric winter anomalous circulation with wavenumber-one and/or-two structure.The anomalous circulation over Eurasia associated with this hemispheric anomalous flow regime seems to provide a favorable condition for the extensive (or diminished) snow cover area over central Asia, which in turn is responsible for the reversed anomalous state of the next Asian summer monsoon and the MAOS. That is, the biennial nature of the climate system in the northern hemisphere may be due, at least partly, to this two-way interactions between the tropics and the extratropics. In these, processes, the Asian monsoon plays a key role as a transmitter of climate signals between the tropics and the extratropics through the land/atmosphere/ocean interaction in the seasonal cycle.In addition, it is strongly suggested that the North Atlantic Oscillation (NAO), in reality, plays a crucial role in the timing of the occurrence of the ENSO event, by stochastically amplifying or damping the biennial oscillation of this coupled climate system. That is, the more or less irregular ENSO cycle may result from this interaction between the MAOS and the NAO, where the former seems to have the nature of an almost-intransitive climate system, while the latter seems to represent the more chaotic nature of the westerly flow regime. Less

通过研究亚洲夏季风、热带和西风的大气/海洋系统之间的统计和动力联系，讨论了亚洲夏季风对全球气候系统年际变化的作用，特别是与 ENSO 时间尺度相关的作用。亚洲季风、热带太平洋的海洋和大气紧密相连，形成一个气候系统，这里命名为 MAOS（季风与耦合） MAOS 显着地表现出两年一次的振荡性质，这种性质倾向于从北部夏季季风季节开始出现异常状态并持续约一年（Yasunari，1990a：1991）。MAOS 的异常状态产生了异常状态。夏季到初冬期间北太平洋副热带和温带地区的大气环流，通过调节副热带高压和静止罗斯贝波传播机制隆冬季节，北太平洋上空的异常环流演化为半球冬季一波和/或二波结构的异常环流。与欧亚大陆上空的异常环流有关。这种半球异常流态似乎为中亚地区广泛（或减少）的积雪提供了有利的条件，这反过来又导致了南半球的异常状态的逆转。也就是说，北半球气候系统的两年性质可能至少部分归因于热带和温带之间的这种双向相互作用。季风通过季节周期中的陆地/大气/海洋相互作用，在热带和温带之间的气候信号传递中发挥着关键作用。此外，强烈建议北大西洋涛动实际上，通过随机放大或抑制这个耦合气候系统的两年一次振荡，NAO 在 ENSO 事件发生的时间中发挥着至关重要的作用。也就是说，或多或少不规则的 ENSO 周期可能由此产生。 MAOS 和 NAO 之间的相互作用，前者似乎具有几乎不过渡的气候系统的性质，而后者似乎代表了西风流状况的更混乱的性质。