IMHE OpenIR  > 山地表生过程与生态调控重点实验室
Stable isotope variations of precipitation and streamflow reveal the young water fraction of a permafrost watershed
Song, Chunlin1,2; Wang, Genxu1; Liu, Guangsheng3; Mao, Tianxu1; Sun, Xiangyang1; Chen, Xiaopeng1,2
Corresponding Author王根绪
2017
Source PublicationHYDROLOGICAL PROCESSES
ISSN0885-6087
EISSN1099-1085
Volume31Issue:4Pages:935-947
SubtypeArticle
Abstract

The streamflow age is an essential descriptor of catchment functioning that controls runoff generation, biogeochemical cycling, and contaminant transport. The young water fraction (Fyw) of streamflow, which can be accurately estimated with tracer data, is effective at characterizing the water age proportions of heterogeneous catchments. However, the Fyw values of permafrost catchments are not known. We selected a watershed in the permafrost region of the Qinghai-Tibet Plateau (QTP) as our study area. Daily interval stable isotopes (deuterium and oxygen-18) of precipitation and streamflow were studied during the 2009 thawing season. The results show that the stable isotope compositions of precipitation and stream water have significant spatial and temporal variations. HYSPLIT backwards trajectory results demonstrate that the moisture in the study area mainly derived from the westerlies and southern monsoons. Thawing processes in the active layer of the permafrost significantly altered the stable isotope compositions of the stream water. The soil temperature, soil moisture, and air temperature are the main drivers of the stable isotope variations in the stream water. We estimated the young water fractions of the five catchments in the study area, which were the first estimates of the Fyw in permafrost catchments in the QTP. The results show that an average of 15% of the streamflow is younger than 43 days. Additional analyses show that the vegetation cover significantly controls the young water fraction of the streamflow. These results will improve our understanding of permafrost hydrological processes and water resource utilization and protection.

; The streamflow age is an essential descriptor of catchment functioning that controls runoff generation, biogeochemical cycling, and contaminant transport. The young water fraction (Fyw) of streamflow, which can be accurately estimated with tracer data, is effective at characterizing the water age proportions of heterogeneous catchments. However, the Fyw values of permafrost catchments are not known. We selected a watershed in the permafrost region of the Qinghai-Tibet Plateau (QTP) as our study area. Daily interval stable isotopes (deuterium and oxygen-18) of precipitation and streamflow were studied during the 2009 thawing season. The results show that the stable isotope compositions of precipitation and stream water have significant spatial and temporal variations. HYSPLIT backwards trajectory results demonstrate that the moisture in the study area mainly derived from the westerlies and southern monsoons. Thawing processes in the active layer of the permafrost significantly altered the stable isotope compositions of the stream water. The soil temperature, soil moisture, and air temperature are the main drivers of the stable isotope variations in the stream water. We estimated the young water fractions of the five catchments in the study area, which were the first estimates of the Fyw in permafrost catchments in the QTP. The results show that an average of 15% of the streamflow is younger than 43 days. Additional analyses show that the vegetation cover significantly controls the young water fraction of the streamflow. These results will improve our understanding of permafrost hydrological processes and water resource utilization and protection.
KeywordPermafrost Hydrology Qinghai-tibet Plateau Stable Isotopes Watershed Hydrology Young Water Fraction
Subject Area水文学
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1002/hyp.11077
URL查看原文
WOS Subject ExtendedWater Resources
Indexed BySCI
WOS KeywordMEAN TRANSIT TIMES ; TIBETAN PLATEAU ; HYDROLOGICAL PROCESSES ; ENVIRONMENTAL SYSTEMS ; MESOSCALE CATCHMENT ; VEGETATION COVER ; RESIDENCE TIMES ; SURFACE RUNOFF ; LAKE BASIN ; MOISTURE
Language英语
Quartile2区
TOP
WOS SubjectWater Resources
WOS IDWOS:000393560800016
Funding OrganizationNational Natural Science Foundation of China(91547203 ; National Basic Research Program of China(2013CBA01807) ; 41401044)
Accession numberAccession number:20165203187129
Citation statistics
Cited Times:28[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.imde.ac.cn/handle/131551/18287
Collection山地表生过程与生态调控重点实验室
Affiliation1.Chinese Acad Sci, Inst Mt Hazards & Environm, Chengdu 610041, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Xiamen Univ Technol, Coll Environm Sci & Engn, Xiamen 361024, Peoples R China
First Author Affilication中国科学院水利部成都山地灾害与环境研究所
Recommended Citation
GB/T 7714
Song, Chunlin,Wang, Genxu,Liu, Guangsheng,et al. Stable isotope variations of precipitation and streamflow reveal the young water fraction of a permafrost watershed[J]. HYDROLOGICAL PROCESSES,2017,31(4):935-947.
APA Song, Chunlin,Wang, Genxu,Liu, Guangsheng,Mao, Tianxu,Sun, Xiangyang,&Chen, Xiaopeng.(2017).Stable isotope variations of precipitation and streamflow reveal the young water fraction of a permafrost watershed.HYDROLOGICAL PROCESSES,31(4),935-947.
MLA Song, Chunlin,et al."Stable isotope variations of precipitation and streamflow reveal the young water fraction of a permafrost watershed".HYDROLOGICAL PROCESSES 31.4(2017):935-947.
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