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中国科学院东亚区域气候-环境重点实验室是经中国科学院批准,在原中国科学院大气物理研究所全球变化东亚区域研究中心基础上成立的开放实验室。研究领域包括东亚区域环境、气候变化等全球变化研究的诸多方面,多学科交叉研究是本实验室的基本特色。同时,实验室还承...
【学术报告】Prof. Xiaogu ZHENG,National Institute of Water and Atmospheric Research, New Zealand

报告题目:  年代际方差分解方法及其在北半球大气环流场年代际可预报性研究中的应用

    :   郑小谷 教授

        位:National Institute of Water and Atmospheric Research, New Zealand

        间:2016428日(周四)上午10:00

        点:大气所40号楼319会议室

 

A decadal variance decomposition method is applied to the Northern Hemisphere (NH)

500-hPa geopotential height (GPH) and the sea level pressure (SLP) taken from the

Last Millennium (850-1850 AD) experiment with the coupled climate model CCSM4,

to estimate the contribution of the intra-decadal variability to the inter-decadal variability.

By removing the intra-decadal variability from the total inter-decadal variability, the residual

variability is more likely to be associated with slowly varying external forcings and slow-

decadal climate processesand therefore is referred to as slow-decadal variability. The

results show that the (multi-)decadal changes of the NH 500-hPa GPH are primarily

dominated by slow-decadal variability, whereas the NH SLP field is primarily dominated

by the intra-decadal variability. At both pressure levels, the leading intra-decadal modes

each have features related to the El Niño-Southern Oscillation (ENSO), the intra-decadal

variability of the Pacific Decadal Oscillation (PDO) and the Arctic Oscillation (AO); while

the leading slow-decadal modes are associated with external radiative forcing (mostly with

volcanic aerosol loadings),the Atlantic Multi-decadal Oscillation (AMO) and the slow-decadal

variability of AO and PDO. Moreover, the radiative forcing has much weaker effect to the

SLP than that to the 500-hPa GPH.

 

 

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