Simulation of paleoclimate over East Asia at 6 ka BP and 21 ka BP by a regional climate model
Simulation of paleoclimate over East Asia at 6 ka BP and 21 ka BP by a regional climate model
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DOI：
10.1007/s00382-004-0452-7
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发表时间：
2004-08
期刊：
影响因子：
4.6
通讯作者：
Yiqun Zheng;Yiqun Zheng;Gui Yu;Sumin Wang;Bin Xue;D. Q. Zhuo;Xin-Min Zeng;H. Liu
中科院分区：
文献类型：
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作者：
Yiqun Zheng;Yiqun Zheng;Gui Yu;Sumin Wang;Bin Xue;D. Q. Zhuo;Xin-Min Zeng;H. Liu
利用一个包含详细陆面过程的区域气候模式（RegCM2），分别采用指定植被和古植被模式模拟了6ákaBP和21ákaBP的东亚季风气候，以探讨陆面对东亚气候系统的影响及其可能的气候变化机制。分辨率为120 × 120km2的RegCM2模拟了6kaBP高纬度地区太阳辐射季节循环的扩大、全年气温的上升和常年积雪的减少。模拟结果表明，东亚夏季风加强，降水量和P-E增加，季风雨带西移、北移。模拟中考虑的古植被影响降低了地面温度，使冬季气温升高，导致冬季中国大陆冷高压减弱。结果表明，模拟温度的季节变化特征与地质记录吻合较好，是对PMIP（Paleocimate Modeling Intercomparison Project）模拟结果的改进。RegCM2模拟了21万年前的气候，全年气温降低，东亚大部分地区降水减少（但青藏高原和中亚地区降水增加）。东亚地区的低温导致东亚冬季风的加强和夏季风的萎缩。实验中考虑的古植被效应扩大了东亚冰川气候的影响，比直接由太阳辐射、冰川作用和低CO2浓度驱动的PMIP模拟更接近地质资料。
Using a regional climate model with detailed land surface processes (RegCM2), East Asian monsoon climates at 6áka BP and 21áka BP are simulated by prescribing vegetation and employing paleovegetation respectively in order to examine land surface effects on East Asian climate system and the potential mechanisms for climate change. The RegCM2 with a 120 Î 120ákm2resolution has simulated the enlargement of the seasonal cycle of insolation, the temperature rising the whole year, and the reduction of perpetual snow in high latitudes at 6áka BP. The simulation shows the East Asian summer monsoon strengthening, precipitation andP–Eincreasing, and the monsoon rain belt shifting westwards and northwards. Effect of paleovegetation included in the modeling reduced surface albedo and caused an increase in the winter temperature, which led to weakening of the winter continental cold anticyclone over China. The results make the seasonal characteristics of simulated temperature changes in better agreement with the geological records, and are an improvement over previous simulations of Paleoclimate Modeling Intercomparison Project (PMIP). The RegCM2 simulated the 21áka BP climate with lowered temperature throughout the year, and with precipitation reduced in most areas of East Asia (but increased in both the Tibetan Plateau and Central Asia). Low temperature over East Asia led to the strengthening of the East Asian winter monsoon and the shrinking of the summer monsoon. The effect of paleovegetation included in the experiment has enlarged the glacial climate influence in East Asia, which is closer to geological data than the PMIP simulations directly driven by insolation, glaciation and low CO2concentration.