中全新世全球极端温度响应:基于MPI-ESM-P模拟试验  

Response of global temperature extremes in mid-Holocene:results from MPI-ESM-P experiments

作　　者：任鑫 石正国[1,3] REN Xin;SHI Zhengguo(State Key Laboratory of Loess and Quaternary Geology,Institute of Earth Environment,Chinese Academy of Sciences,Xi’an 710061,China;University of Chinese Academy of Sciences,Beijing 100049,China;CAS Center for Excellence in Quaternary Science and Global Change,Xi’an 710061,China)

机构地区：[1]中国科学院地球环境研究所黄土与第四纪地质国家重点实验室,西安710061 [2]中国科学院大学,北京100049 [3]中国科学院第四纪科学与全球变化卓越创新中心,西安710061

出　　处：《地球环境学报》2019年第5期465-478,共14页Journal of Earth Environment

基　　金：国家自然科学基金项目(41690115);中国科学院战略性先导科技专项（XDA20070103）;中国科学院青年创新促进会~~

摘　　要：中全新世是北半球轨道时间尺度距今最近的温暖期,是当前全球变暖的历史相似型之一,研究该阶段极端温度的变化有助于理解典型温暖期极端温度的响应和机制。利用MPI-ESM-P海气耦合模式中全新世暖期试验与工业革命前试验数据,分析中全新世暖期全球极端温度的响应。结果表明:由于北半球夏季轨道日射量的增加,与工业革命前相比,中全新世平均温度在极地海洋以及夏季北半球中高纬度陆地地区升高,其余区域温度降低;平均温度升高的区域,极端高温与极端低温也将上升,暖事件频率增加;陆地区域日最高温相关指标比日最低温相关指标的变化幅度更大;相对于极端高温事件的响应,极地海洋地区极端低温事件的响应更为显著,冷事件频率显著减少,全年高于0℃的天数显著增加。Background,aim,and scope Compared to the modern warming period,mid-Holocene is the most recent warm period during summer over north hemisphere on the orbital time scale,which is resulted from higher orbital insolation.To evaluate the response of temperature extremes in mid-Holocene will help to better understand how temperature extremes change in future warming scenarios.This paper aims to evaluate the response of temperature extremes in mid-Holocene by numerical experiments under the Coupled Model Intercomparison Project 5(CMIP5)framework.Materials and methods We adopt the outputs of mid-Holocene experiment and pre-industrial experiment by the coupled climate model MPI-ESM-P in this paper.Indices based on daily mean temperature,daily maximum temperature(Tmax)and daily minimum temperature(Tmin)are analyzed,respectively.Extreme temperature indices are defined by the Expert Team on Climate Change Detection and Indices(ETCCDI).Results In mid-Holocene,summer extreme temperature increases over boreal continents and polar oceans but decreases over the tropic.Warm events and cold events become more frequent over extratropical continents.Cold events decrease significantly over polar oceans especially where close to the mainland.Discussion In mid-Holocene,responses of extreme temperature indices show features that are different from greenhouse gases-induced warming.Extreme temperature indices based on Tmax changes more than indices based on Tmin over continents,because insolation heats the globe in the daytime but greenhouse gas heats it more during the night.However,over the polar oceans,monthly minimum temperature changes faster than monthly maximum temperature,which is consistent with the response under greenhouse gases-induced warming.Both warm events and cold events become more frequent over extratropical continents,which leads to high seasonal temperature variance.Conclusions Extreme temperature increases(decreases)and extreme warm(cold)events become more frequent in summer(winter)over extratropical continent,and te

关 键 词：中全新世 极端温度 轨道日射 数值模拟 

分 类 号：G63[文化科学—教育学]