基于卫星降水产品的华北北纬38°带降水氢氧同位素时空特征及水汽来源

doi:10.13287/j.1001-9332.202106.026

应用生态学报 ›› 2021, Vol. 32 ›› Issue (6): 1951-1962.doi: 10.13287/j.1001-9332.202106.026

• 稳定同位素生态学专栏 • 上一篇下一篇

基于卫星降水产品的华北北纬38°带降水氢氧同位素时空特征及水汽来源

檀康达^1,2, 王仕琴^1,2, 郑文波¹

¹中国科学院遗传与发育生物学研究所农业资源研究中心/中国科学院农业水资源重点实验室/河北省节水农业重点实验室, 石家庄 050022;
²中国科学院大学, 北京 100049

收稿日期:2020-12-21 接受日期:2021-04-01 发布日期:2021-12-15
通讯作者: * E-mail: sqwang@sjziam.ac.cn
作者简介:檀康达, 男, 1995年生, 硕士研究生。主要从事降水氢氧同位素研究。E-mail: tankangda@ms.sjziam.ac.cn
基金资助:
国家重点研发计划项目(2018YFC0406502,2016YFD0800100)和国家自然科学基金重点项目(41530859)资助

Spatial and temporal variations of hydrogen and oxygen isotopes and sources of water vapour indicated from satellite precipitation products along the transection of 38°north latitude in North China

TAN Kang-da^1,2, WANG Shi-qin^1,2, ZHENG Wen-bo¹

¹Center for Agricultural Resources Research, Institute of Genetics and Developmental Biology, Chinese Academy of Sciences/Key Laboratory of Agricultural Water Resources, Chinese Academy of Sciences/Hebei Key Laboratory of Water-Saving Agriculture, Shijiazhuang 050022, China;
²University of Chinese Academy of Sciences, Beijing 100049, China

Received:2020-12-21 Accepted:2021-04-01 Published:2021-12-15
Contact: * E-mail: sqwang@sjziam.ac.cn
Supported by:
National Key R&D Program of China (2018YFC0406502, 2016YFD0800100) and the National Natural Science Foundation of China (41530859).

摘要/Abstract

摘要： 降水氢氧同位素的变化程度对反演降水水汽来源和认识蒸发作用的强弱有重要作用;结合高时间分辨率的卫星降水产品能够提高反演水汽来源的准确性,更清晰地说明水汽团的运移路径。本研究以位于华北北纬38°带的中国科学院太行山站(山区)、栾城站(山前平原)和南皮站(滨海低平原)2015—2018年降水氢氧同位素为对象,分析该区域降水水汽来源和极端降水对氢氧同位素的影响。结果表明: 华北北纬38°带降水氢氧同位素在年内呈雨季富集、旱季贫化的特征,雨季降水氢氧同位素表现出随降水量增加而贫化的趋势;华北山前平原大气降水氢氧同位素拟合关系斜率和截距最小,说明山前平原降水受二次蒸发作用的影响最显著,蒸发作用也使得平原区枯水年同位素变幅最大,而山区雨量效应造成丰水年同位素变幅最大。利用卫星产品揭示降水的水汽来源,华北北纬38°带全年主导水汽为西北和内陆方向水汽,而雨季为西南和近缘海洋性水汽。由于水汽来源的变化,同时,山区和平原区分别受雨量效应和二次蒸发的影响,使得降水氢氧同位素在丰水年(2016)存在显著差异。用HYSPLIT模型模拟2016年“7·19”极端降水的路径,西南水汽是山区和平原区极端降水的主要水汽来源,而低平原区混合了东南向水汽。说明水汽源的差异及蒸发过程主导华北北纬38°带极端降水氢氧同位素的时空分布特征。

关键词: 华北北纬38°带, 降水氢氧同位素, 极端降水, CMORPH卫星降水产品, HYSPLIT模型

Abstract: The variations of hydrogen and oxygen isotopes in rainfall are critical for understanding the sources of rainfall and the influence of local evaporation. Satellite precipitation products with high time resolution (for instance 1 h) could be helpful for testifying the accuracy of water sources, as it can clearly illustrate the route of cloud movement. In this study, we analyzed the composition of hydrogen and oxygen isotopes in different rainfall events in three stations from 2015 to 2018 along the transection of 38° N latitude from Taihang Mountains to the coastal region in North China, Taihang Mountain Station (mountainous area), Luancheng Station (pre-mountain plain) and Nanpi Station (coastal low plain). By selecting typical rainfall events, water vapor sources and its influence rainfall on hydrogen and oxygen isotopes were analyzed with hourly available CMORPH satellite precipitation products. Results showed that the hydrogen and oxygen isotopes of precipitation were cha-racterized by enrichment in the rainy season and depletion in the dry season. The hydrogen and oxygen isotopes in the rainy season showed a tendency of depletion with the increases of precipitation. The slope and intercept of the fitted relationship of hydrogen and oxygen isotopes in the piedmont region of the mountains were the lowest, indicating that precipitation in the piedmont plain was significantly affected by secondary evaporation fractionation. The effect of evaporation resulted in the largest variations of isotope ratio in the dry year. In the mountainous station, due to the heavy rainfall, large isotopic variation was found in rich precipitation year. Based on the route analysis of sate-llite precipitation products, dominant water vapor in the region was inland and northwest-oriented water vapor, while water vapor in the rainy season was from southwest and from the Pacific Ocean. There was a significant difference in the hydrogen and oxygen isotopes of precipitation in the mountainous and plain stations in 2016, owing to water vapor sources and effects of rainfall for the mountainous and evaporation for plain. The results from HYSPLIT model showed that during the rainstorm on 19th July in 2016, water vapor at the mountainous station was mainly from the southwest, while that in the coastal plain was a mixture of southwest and southeast sources. Overall, our results showed that spatial and temporal variations of hydrogen and oxygen isotopes were controlled by both water sources and evaporation processes along the transection of 38° north latitude in North China.

Key words: the transection of 38° north latitude in North China, hydrogen and oxygen isotopes in rainfall, heavy rainstorm event, CMORPH Satellite Precipitation Products, HYSPLIT model

檀康达, 王仕琴, 郑文波. 基于卫星降水产品的华北北纬38°带降水氢氧同位素时空特征及水汽来源[J]. 应用生态学报, 2021, 32(6): 1951-1962.

TAN Kang-da, WANG Shi-qin, ZHENG Wen-bo. Spatial and temporal variations of hydrogen and oxygen isotopes and sources of water vapour indicated from satellite precipitation products along the transection of 38°north latitude in North China[J]. Chinese Journal of Applied Ecology, 2021, 32(6): 1951-1962.

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基于卫星降水产品的华北北纬38°带降水氢氧同位素时空特征及水汽来源

Spatial and temporal variations of hydrogen and oxygen isotopes and sources of water vapour indicated from satellite precipitation products along the transection of 38°north latitude in North China

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