Impacts of permafrost degradation on streamflow in the northern Himalayas

扫码查看

原文链接

万方数据
维普

外文摘要：The Himalayan water tower provides crucial water resources for Asia.Permafrost degradation is deemed to exert important impacts on streamflow in the Himalayan rivers.Yet,the magnitudes of such impacts remain poorly quantified.Here,we established a robust hydrological model that incorporated active layer deepening and ground ice melt for the drainage basin of the largest river in the northern Himalayas-the Yarlung Zangbo River(YZR).We estimated that permafrost degradation led to～0.65 km3/yr decrease in surface runoff and～0.35 km3/yr increase in baseflow and ground ice melt contributed～0.25％to the annual streamflow in the YZR for the period 2001-2022.The"fill-and-spill"mechanism helps explain the seeming contradiction of observed increasing versus decreasing baseflow in different permafrost regions worldwide.We propose that the dilution of riverine dissolved organic carbon(DOC)concentrations by baseflow may lead to the riverine DOC hysteresis patterns.This study not only lays solid scientific basis for water resources management in the Himalayas,but also yields new insights into how to interpret measured river discharge and nutrient flux in permafrost regions over the globe.

外文关键词：

Permafrost degradationHydrologyStreamflowSurface runoffGroundwaterHimalayas

作者：

Linfeng FAN、Fang JI、Xingxing KUANG、Zhilin GUO、Rui ZHANG、Chunmiao ZHENG

展开 >

作者单位：

State Key Laboratory of Mountain Hazards and Engineering Resilience,Institute of Mountain Hazards and Environment,Chinese Academy of Sciences,Chengdu 610299,China

Yangtze Institute for Conservation and Development,Hohai University,Nanjing 210024,China

School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China

Eastern Institute for Advanced Study,Ningbo 315200,China

School of Environmental Science and Engineering,Southern University of Science and Technology,Shenzhen 518055,China

展开 >

基金：

National Natural Science Foundation of ChinaHundred Talents Program of the Chinese Academy of SciencesScience and Technology Research Program of the Institute of Mountain Hazards and Environment,Chinese Academy of Sciences

项目编号：

92047202IMHE-ZDRW-03

出版年：

2024

DOI：

10.1007/s11430-023-1297-4

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(6)