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Pollen-inferred vegetation and environmental changes in the central Tibetan Plateau since 8200 yr BP

Science China Earth Sciences 2009年第8期52卷 1104-1114页

作者： LIU Kam-Biu carrie morrill Jonathan T. OVERPECK Julia E. COLE Department of Oceanography and Coastal Sciences School of the Coast and Environment Louisiana State University NOAA Paleoclimatology Program and Cooperative Institute for Research in Environmental Sciences (CIRES) Institute for the Study of Planet Earth and Department of Geosciences University of Arizona

The ecotone between alpine steppe and meadow in the central Tibetan Plateau is sensitive to climate changes. Here we used the pollen records from three lakes in this region to reconstruct the evolution of local vegetation and climate since 8200 cal. yr BP. The history of temperature and precipitation was reconstructed quantitatively with multi-bioclimatic indexes and a transfer function from pollen records. Results show that the steppe/meadow dominated during the period of 8200―6500 cal. yr BP, especially 8200―7200 cal. yr BP, indicating the central Tibetan Plateau was controlled by strong monsoon. The steppe dominated during the periods of 6000―4900, 4400―3900, and 2800―2400 cal. yr BP. The steppe decreased gradually and the meadow expanded during the period of 4900―4400 cal. yr BP. Three century-scale drought events occurred during 5800―4900, 4400―3900 and 2800 cal. yr BP, respectively. The first time when the regional climate shifted to the present level was at 6500 cal. yr BP in the central Plateau. Since 3000 cal. yr BP, the temperature and precipitation have decreased gradually to the present level. However, the cold climate between 700―300 cal. yr BP likely corresponds to the Little Ice Age.

关键词： the meadow-steppe ecotone (MSE) pollen record bioclimatic index central Tibetan Plateau

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多种代用资料和模型模拟得到的亚洲季风在8.2ka显著气候影响的证据（英文）

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地球环境学报 2011年第3期2卷 426-441页

作者： morrill carrie WAGNER Amy J OTTO-BLIESNER Bette L ROSENBLOOM Nan Cooperative Institute for Research in Environmental Sciences University of Colorado NOAA's National Climatic Data Center Paleoclimatology Branch Climate and Global Dynamics Division National Center for Atmospheric Research

Given the likelihood of future reductions in the strength of the Atlantic Meridional Overturning Circulation(AMOC),it is important to document how changes in the AMOC have altered climate patterns in the past and to assess the skill of coupled climate models in reproducing these *** past abrupt changes in the AMOC,the 8.2 ka event provides a particularly useful case study because its duration,magnitude of AMOC reduction and background climate state are closest to conditions expected in the *** this research,we present an expanded proxy synthesis of the 8.2 ka event in monsoonal Asia,including new high-resolution lake and bog records,more sites from the East Asia monsoon region and proxies of winter monsoon *** compare proxy evidence with a new simulation of the 8.2 ka event using the Community Climate System Model version 3(CCSM3) and prescribing North Atlantic freshwater forcing according to the latest *** find clear and objectively-determined evidence for 8.2 ka climate anomalies at nearly all of the fourteen proxy sites,emphasizing the strong and widespread impacts of the event in monsoonal Asia during both summer and winter *** model simulation corroborates that these anomalies,described generally as a weakening of the summer monsoon and strengthening of the winter monsoon,were likely caused by a reduction of the *** of regional anomalies in East Asia reveals some spatial heterogeneity,however,that in the model simulation is caused by contraction of the seasonal migration of the subtropical monsoon *** duration of climate anomalies at 8.2 ka in monsoonal Asia,both in proxy records and the model simulation,generally matches the duration of the event in Greenland ice core δ^(18)O,further supporting a tight connection to the North Atlantic.

关键词： abrupt climate change coupled climate model Atlantic Meridional Overturning Circulation freshwater forcing Holocene

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青藏高原中部中全新世以来草甸—草原生态群落的迁移与干旱事件

青藏高原中部中全新世以来草甸—草原生态群落的迁移与干旱事件

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中国植物学会七十五周年年会

作者：唐领余沈才明李春海彭金兰刘惠 Kam-Biu Liu carrie morrill Jonathan.T.Overpeck Jonathan.E.Cole 杨保中国科学院南京地质古生物研究所 Atmospheric Sciences Research Center State University of New YorkAlbanyNew York 12203 USA 中国科学院南京地理与湖泊研究所湖泊与环境国家重点实验室安徽师范大学生命科学院 Department of Geography and Anthropology Louisiana State UniversityBaton RougeLouisiana 70803 USA

错那是一个大型淡水湖,它位于在青藏高原中部的草甸.草原生态群落(MSE)中心。由该湖钻孔岩心的孢粉记录,依据判别分析和花粉-气候转换函数定量恢复的植被可以显示 MSE 的迁移历史以及西南季风气候变化事件。研究结果表明,在6000～4900 *...

错那是一个大型淡水湖,它位于在青藏高原中部的草甸.草原生态群落(MSE)中心。由该湖钻孔岩心的孢粉记录,依据判别分析和花粉-气候转换函数定量恢复的植被可以显示 MSE 的迁移历史以及西南季风气候变化事件。研究结果表明,在6000～4900 *** 期间

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