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Natural interdecadal weakening of East Asian summer monsoon in the late 20th century

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Science Bulletin 2005年第17期 109-115页

作者： jiang dabang1, 2 & wang huijun1 1. nansen-zhu international research center, institute of atmospheric physics, chinese academy of sciences, beijing 100029, china 2. Key Laboratory of Regional Climate-Environment research for Tem-perate East Asia, chinese academy of sciences, beijing 100029, china

Based on the reanalysis data throughout 1948―2002 as derived from the United States National centers for Environmental Prediction and National center for Atmos-pheric research, it is revealed that East Asian summer mon-soon (EASM) intensity weakens on an interdecadal timescale since the mid-1960s, and twice interdecadal jumps are re-corded in the EASM intensity index series in the late 20th century, respectively occurring in the mid-1960s and mid- to late 1970s. Six globally coupled atmosphere-ocean models’ outputs under the SRES A2 greenhouse gas and aerosol emission scenario, provided by the IPCC Data Distribution center and the Hadley center for Climate Prediction and research, are then systematically examined. It follows that the above EASM weakening is not closely related to synchro-nizing anthropogenic global warming, and, therefore, it should be qualitatively natural change process. Over the 21st century, the EASM intensity is likely increased slightly by continually intensified greenhouse effect relative to the late 20th century.

关键词： East Asian summer monsoon interdecadal weakening global warming natural change.

Simulation of sea surface temperature changes in the Middle Pliocene warm period and comparison with reconstructions

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Science Bulletin 2011年第9期56卷 892-901页

作者： YAN Qing1,2*, ZHANG ZhongShi3,1*, wang huijun1,4, jiang dabang1,4,5 & ZHENG WeiPeng6 1 nansen-zhu international research Centre, institute of atmospheric physics, chinese academy of sciences, beijing 100029, china 2 Graduate University of chinese academy of sciences, beijing 100049, china 3 Bjerknes Centre for Climate research, Uniresearch, Bergen N-5007, Norway 4 Climate Change research center, chinese academy of sciences, beijing 100029, china 5 Key Laboratory of Regional Climate-Environment research for Temperate East Asia, chinese academy of sciences, beijing 100029, china 6 National Key Laboratory of Numerical Modeling for atmospheric sciences and Geophysical Fluid Dynamics, institute of atmospheric physics, chinese academy of sciences, beijing 100029, china nansen-zhu international research Centre Institute of Atmospheric Physics Chinese Academy of Sciences Graduate University of chinese academy of sciences Bjerknes Centre for Climate research UniResearch Climate Change research center Chinese Academy

The Middle Pliocene (ca 3.12–2.97 Ma) is a recent warm period in the Earth’s history. In many respects, the warmth of the Middle Pliocene is similar to the probable warm situation of the late 21st century predicted by climate models. Understanding the Middle Pliocene climate is important in predicting the future climate with global warming. Here, we used the latest reconstructions for the Middle Pliocene—Pliocene research Interpretation and Synoptic Mapping (PRISM) version 3—to simulate the Middle Pliocene climate with a fully coupled model Fast Ocean Atmosphere Model. From comparison of the results of simulations with reconstructions, we considered two important scientific topics of Middle Pliocene climate modeling: extreme warming in the subpolar North Atlantic and a permanent El Ni?o in the tropical Pacific. Our simulations illustrate that the global annual mean sea surface temperature (SST) in the Middle Pliocene was about 2.3°C higher than that in the pre-industrial era. The warming was stronger at midand high latitudes than at low latitudes. The simulated SST changes agree with SST reconstructions in PRISM3 data, especially for the North Atlantic, North Pacific and west coast of South America. However, there were still discrepancies between the simulation of the SST and reconstructions for the subpolar North Atlantic and tropical Pacific. In the case of the Atlantic, the weakened meridional overturning circulation in the simulation did not support the reconstruction of the extremely warm condition in the subpolar North Atlantic. In the case of the tropical Pacific, the whole ocean warmed, especially the eastern tropical Pacific, which did not support the permanent El Ni?o suggested by the reconstruction. From evaluation of the modeling and reconstruction, we suggest that the above discrepancies were due to uncertainties in reconstructions, difficulties in paleoclimate modeling and deficiencies of climate models. The discrepancies should be reduced through cons

关键词： Middle Pliocene sea surface temperature permanent El Ni?o numerical modeling extreme warming

Influence of October Eurasian Snow on Winter Temperature over Northeast china

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Advances in atmospheric sciences 2017年第1期34卷 116-126页

作者： Huanlian LI huijun wang dabang jiang china Meteorological Administration Training Centre Beijing 100081China nansen-zhu international research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Climate Change research center Chinese Academy of SciencesBeijing 100029China

This paper addresses the interannual variation of winter air temperature over Northeast china and its connection to preceding Eurasian snow cover. The results show that there is a significant negative correlation between October Eurasian snow cover and following-winter air temperature over Northeast china. The snow cover located in eastern Siberia and to the northeast of Lake Baikal plays an important role in the winter air temperature anomaly. More （less） eastern Siberia snow in October can cause an atmospheric circulation anomaly pattern in which the atmospheric pressure is higher （lower） than normal in the polar region and lower （higher） in the northern mid-high latitudes. Due to the persistence of the eastern Siberia snow from October to the following winter, the winter atmospheric anomaly is favorable （unfavorable） to the widespread movement of cold air masses from the polar region toward the northern mid-high latitudes and, hence, lower （higher） temperature over Northeast china. Simultaneously, when the October snow cover is more （less）, the SST in the northwestern Pacific is continuously lower （higher） as a whole; then, the Aleutian low and the East Asia trough are reinforced （weakened）, favoring the lower （higher） temperature over Northeast china.

关键词： winter air temperature Northeast china Eurasian snow cover physical mechanism atmospheric circulationanomaly

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Impact of Topography and Land-Sea Distribution on East Asian Paleoenvironmental Patterns

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Impact of Topography and Land-Sea Distribution on East Asian...

Simulation of sea surface temperature changes in the Middle Pliocene warm period and comparison with reconstructions

中国科学院地质与地球物理研究所2006学术年会

作者： ZHANG Zhongshi~(1,2),wang huijun~2,GUO Zhengtang~(3,1),and jiang dabang~2 1 institute of Geology and Geophysics,chinese academy of sciences,beijing 100029 2 nansen-zhu international research center,institute of atmospheric physics, chinese academy of sciences,beijing 100029 3 State Key Laboratory of Loess and Quaternary Geology,institute of Earth Environment, chinese academy of sciences,Xi’an 710075

Much geological research has illustrated the transition of paleoenvironmental patterns during the Cenozoic from a planetary-wind-dominant type to a monsoon-dominant type, indicating the initiation of the East Asian monsoon and inland-type ***,there is a dispute about the causes and mechanisms of the transition,especially about the impact of the Himalayan/Tibetan Plateau uplift and the Paratethys Sea *** numerical sensitivity experiments under dirent land-sea distributions and Himalayan/Tibetan Plateau topography conditions are performed here to simulate the evolution of climate belts with emphasis on changes in the rain band,and these are compared with the changes in the paleoenvironmental patterns during the Cenozoic recovered by geological *** consistency between simulations and the geological evidence indicates that both the Tibetan Plateau uplift and the Paratethys Sea retreat play important roles in the formation of the monsoon-dominant environmental pattern. Furthermore,the simulations show the monsoon-dominant environmental pattern comes into being when the Himalayan/Tibetan Plateau reaches 1000-2000 m high and the Paratethys Sea retreats to the Turan Plate.

关键词： Paratethys Sea retreat Himalayan/Tibetan Plateau uplift paleoenvironmental pattern precipitation field Turan Plate

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chinese Science Bulletin 2011年第9期56卷 890-899页

作者： YAN Qing ZHANG ZhongShi wang huijun jiang dabang ZHENG WeiPeng nansen-zhu international research Centre Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China Graduate University of chinese academy of sciences Beijing 100049China Bjerknes Centre for Climate research UniResearchBergen N-5007Norway Climate Change research center Chinese Academy of SciencesBeijing 100029China Key Laboratory of Regional Climate-Environment research for Temperate East Asia Chinese Academy of SciencesBeijing 100029China National Key Laboratory of Numerical Modeling for atmospheric sciences and Geophysical Fluid Dynamics Institute of Atmospheric PhysicsChinese Academy of SciencesBeijing 100029China

关键词：上新世中东温度变化未来气候变化热带太平洋气候模拟北大西洋仿真

Considerable Model–Data Mismatch in Temperature over china during the Mid-Holocene: Results of PMIP Simulations

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Considerable Model–Data Mismatch in Temperature over China ...

Influence of October Eurasian Snow on Winter Temperature over Northeast china

第八届全国优秀青年气象科技工作者学术研讨会

作者： dabang jiang xianmei lang ZHIPING TIAN TAO wang nansen-zhu international research Centre Institute of Atmospheric Physics and Key Laboratory of Regional Climate-Environment Research for Temperate East Asia and Climate Change Research Center Chinese Academy of Sciences international center for Climate and Environment sciences Institute of Atmospheric Physics Chinese Academy of Sciences nansen-zhu international research Centre Institute of Atmospheric Physics and Graduate University of Chinese Academy of Sciences nansen-zhu international research Centre Institute of Atmospheric Physics Chinese Academy of Sciences

Using the experiments undertaken by 36 climate models participating in the Paleoclimate Modeling Intercomparison Project（PMIP）, this study examines annual and seasonal surface temperatures over china during the mid-Holocene. Compared to the present or preindustrial climate, 35 out of the 36 PMIP models reproduced colder-than-baseline annual temperature, with an average cooling of 0.4 K, during that *** temperature change followed closely the change in incoming solar radiation at the top of the atmosphere over china during the mid-Holocene. Temperature was reduced（elevated） in boreal winter and spring（summer） in all of the PMIP models, with an average of 1.4 K（1.0 K） at the national scale. Colder（warmer）-than-baseline temperatures were derived from 14 of the 16 atmosphere-only（18 of the 20 coupled）models during the mid-Holocene boreal autumn. Interactive ocean was found to lead to a warming effect on annual（0.3 K）, boreal winter（0.5 K）, and boreal autumn（0.7 K） temperatures, with reference to the atmosphere-only models. Interactive vegetation had little impact in terms of six pairs of coupled models with and without vegetation effects. The above results are in stark contrast to warmer-than-present annual and winter climate conditions as derived from multiproxy data for the mid-Holocene. Coupled models generally perform better than atmosphere-only models.

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Influence of October Eurasian Snow on Winter Temperature ove...