| 基于拉格朗日方法评估青藏高原若尔盖地区水汽输送特征 |
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| 引用本文： | 刘煜,刘蓉,王欣,王作亮.基于拉格朗日方法评估青藏高原若尔盖地区水汽输送特征[J].高原气象,2022,41(1):58-67. |
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| 作者姓名： | 刘煜 刘蓉 王欣 王作亮 |
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| 作者单位： | 中国科学院西北生态环境资源研究院/中国科学院寒旱区陆面过程与气候变化重点实验室,甘肃兰州 730000;中国科学院大学,北京 100049,中国科学院西北生态环境资源研究院/中国科学院寒旱区陆面过程与气候变化重点实验室,甘肃兰州 730000 |
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| 基金项目： | 国家自然科学基金项目（42075065,42175107,42105089）；;兰州大学半干旱气候变化教育部重点实验室开放基金（lzujbky-2021-kb02）； |
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| 摘 要： | 干旱指数一直以来是评估一个地区地表干湿状态的有效标准.为了认识青藏高原若尔盖地区在极端干旱和湿润条件下的水汽空间分布格局,本文基于地面观测资料计算月尺度的标准化降水蒸散指数,提取2000-2017年青藏高原若尔盖地区的极端干旱和湿润状况,利用拉格朗日后向轨迹模型模拟该地区极端干湿条件下的水汽输送路径,并评估潜在水汽源地...
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| 关 键 词： | 标准化降水蒸散指数 水汽输送 干湿演变 拉格朗日后向轨迹模型 干旱事件 |
The Characteristics of Water Vapor Transport Based on Lagrangian Method in the Zoige,Qinghai-Xizang Plateau |
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| LIU Yu,LIU Rong,WANG Xin,WANG Zuoliang.The Characteristics of Water Vapor Transport Based on Lagrangian Method in the Zoige,Qinghai-Xizang Plateau[J].Plateau Meteorology,2022,41(1):58-67. |
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| Authors: | LIU Yu LIU Rong WANG Xin WANG Zuoliang |
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| Institution: | (Key Laboratory of Land Surface Process and Climate Change in Cold and Arid Regions,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,Gansu,China;University of Chinese academy of sciences,Beijing 100049,China) |
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| Abstract: | The drought index has always been a practical standard for assessing a specific region’s dry and wet state.In order to better understand the spatial distribution pattern of water vapor transport in the Zoige region of the Qinghai-Xizang Plateau under extreme dry and wet conditions,this paper calculates the monthly standardized precipitation evapotranspiration index based on the ground observation data.It extracts the extreme drought and wet conditions in the Zoige region of the Qinghai-Xizang Plateau from 2000 to 2017.The Lagrangian backward trajectory model is used to simulate the water vapor transport path under extreme dry and wet conditions and evaluate the location of potential evapotranspiration water vapor sources and their contributions to the water vapor transport in the study area.The results show that the main water vapor transport path is concentrated in the south branch transport path affected by the southwest monsoon during the wet period.The route originates from the Arabian Sea and the Bay of Bengal and finally arrives at the Zoige from the western and southern flank of the Qinghai-Xizang Plateau.Moreover,the water vapor transport pathway during the drought period is mainly affected by the westerlies.The dominant path starts from North America and the North Atlantic,spreads from west to east,the mid-latitude Eurasian continent,and finally reaches the north of the Qinghai-Xizang Plateau.The main water vapor sources appeared in the Qinghai-Xizang Plateau,Sichuan Basin,Bay of Bengal,Arabian Sea,and other regions.Affected by the water vapor transmission path in different periods,these water vapor sources show different characteristics.In the wet period,the water vapor source is mainly distributed around the south of the Qinghai-Xizang Plateau(the contribution rate is 35.98%).In contrast,the primary water vapor source during the drought period appears in the northern Qinghai-Xizang Plateau(the contribution rate is 28.35%).In addition,the contribution rate of water vapor sources from the Arabian Sea and the Bay of Bengal is higher in the wet period.In contrast,the contribution rate of water vapor in the local Zoige area and Sichuan is higher in the drought period.The analysis results will help to understand the formation mechanism of water vapor during extreme drought and wet states,how the water vapor sources work,and the contribution rate of the water vapor sources.This research can deepen the understanding of the mechanism of drought and flood disasters. |
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| Keywords: | Standardized Precipitation Evapotranspiration Index water vapor transport wet and drought evolution Lagrangian backward trajectory model drought event |
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