首页|Spatiotemporal variation of rainy season span and precipitation recorded by lacustrine laminated pollen in the Tibetan Plateau during the past two millennia

Spatiotemporal variation of rainy season span and precipitation recorded by lacustrine laminated pollen in the Tibetan Plateau during the past two millennia

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The quantitative reconstruction of the length of the rainy season and precipitation on the Tibetan Plateau(TP)is crucial for revealing the spatiotemporal evolution of the Westerlies and Asian summer monsoon,as well as its ecological and environmental effects.Accurately determining the start and end times of the rainy season on the Plateau remains challenging.This study determined the start and end times of the rainy season in different locations on the Plateau by identifying precipitation inflection points.We calculated the duration and precipitation amount of the rainy season and established a transfer function between the modem pollen assemblages and them.Then,we reconstructed the rainy season variations in Kusai Lake(northern TP)and Jiang Co(central TP)during the past two millennia.The results showed that,the rainy season precipitation in Kusai Lake recorded five periods of high precipitation:AD 580-680,1000-1100,1200-1450,1550-1780,and 1920-present,cor-responding to the stages with long rainy season.The rainy season precipitation sequence in Jiang Co recorded four periods of high precipitation:AD 80-500,800-950,1250-1450,and 1780-present,which is consistent with the long rainy season before AD 1000 but unclear afterward.Spatially,rainy season precipitation on the Plateau exhibited four patterns:"wet in both north and south"may be related to abnormally strong summer monsoons;"dry in both north and south"likely associated with weak Westerly wind and weak summer monsoon;"wet in the south and dry in the north"linked to strong summer monsoon and weak Westerly wind;and"dry in the south and wet in the north"connected to weak summer monsoon and strong Westerly wind.This study revealed the spatiotemporal evolution pattern of the rainy season onset and end,duration,and precipitation amount on the Plateau over the past two millennia.It provides natural background support for further understanding the coupling between Westerly wind and Asian summer monsoon.

Tibetan PlateauPast two millenniaRainy season lengthRainy season precipitationQuantitative reconstruction

Anning CUI、Houyuan LU、Juzhi HOU、Xingqi LIU、Deke XU

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Key Laboratory of Cenozoic Geology and Environment,Institute of Geology and Geophysics,Chinese Academy of Sciences,Beijing 100029,China

Innovation Academy for Earth Science,Chinese Academy of Sciences,Beijing 100029,China

College of Earth and Planetary Sciences,University of Chinese Academy of Sciences,Beijing 100049,China

Group of Alpine Paleoecology and Human Adaptation,State Key Laboratory of Tibetan Plateau Earth System,Resources and Environment,Institute of Tibetan Plateau Research,Chinese Academy of Sciences,Beijing 100101,China

University of Chinese Academy of Sciences,Beijing 100049,China

Capital Normal University College of Resource Environment and Tourism,Beijing 100048,China

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国家自然科学基金国家自然科学基金中国科学院战略规划重点项目中国博士后科学基金

4183032242202217 & T2192954XDA20070101032021M703195

2024

10.1007/s11430-023-1255-3

中国科学:地球科学(英文版)
中国科学院

中国科学:地球科学(英文版)

影响因子：1.002
ISSN：1674-7313
年,卷(期)：2024.67(3)
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