GSTDTAP  > 资源环境科学
DOI10.1029/2019WR024771
Contrasting Evaporative Responses of Ecosystems to Heatwaves Traced to the Opposing Roles of Vapor Pressure Deficit and Surface Resistance
Wang, Peng1,2; Li, Dan2; Liao, Weilin3; Rigden, Angela4; Wang, Wen1
2019-06-01
发表期刊WATER RESOURCES RESEARCH
ISSN0043-1397
EISSN1944-7973
出版年2019
卷号55期号:6页码:4550-4563
文章类型Article
语种英语
国家Peoples R China; USA
英文摘要

Understanding the evaporative response of ecosystems to heatwaves is critical for managing ecosystem services and water resources, especially under a changing climate. In this study, we examine the land-atmosphere exchange of water and heat fluxes under heatwave and nonheatwave conditions across five different land cover types, including grasslands, shrublands, croplands, deciduous broadleaf forests, and evergreen needleleaf forests, using data from eddy covariance towers. Results show that net radiation and sensible heat flux increase from nonheatwave to heatwave conditions across all five land cover types but latent heat flux shows contrasting responses to heatwaves. An attribution analysis further demonstrates that heatwave-induced changes in evaporative fraction are mainly caused by changes in vapor pressure deficit (positive contribution) and changes in surface resistance (negative contribution). The imbalance between the positive and negative contributions varies across the five land cover types and is responsible for their contrasting evaporative responses to heatwaves.


Plain Language Summary A heatwave is a period of extremely hot weather. Under a warming climate, heatwaves are expected to become more frequent, stronger, and longer lasting. Heatwaves are amongst the deadliest natural disasters. Within such contexts, key questions that need to be addressed include how different ecosystems respond to heatwaves differently and, more importantly, what factors control such contrasting responses. In this study, we employ an analytical attribution framework and combine it with observational data to explore the responses of evaporative fraction, a key indicator of the partition between sensible and latent heat fluxes, to heatwaves over five major land cover types. We quantify the contributions of various land surface and atmospheric factors in controlling changes in the evaporative fraction under heatwaves. Our analysis indicates that the vapor pressure deficit and surface resistance are the dominant factors but play opposing roles, with changes in the vapor pressure deficit enhancing the evaporative fraction but changes in the surface resistance reducing the evaporative fraction. Their relative contributions vary across land cover types, thereby explaining the contrasting ecosystem responses to heatwaves. By identifying the key factors controlling the ecosystem responses to heatwaves, our results provide novel insights into how to manage ecosystem services and water resources.


英文关键词evaporative fraction heatwaves ecosystem vapor pressure deficit surface resistance
领域资源环境
收录类别SCI-E
WOS记录号WOS:000477616900003
WOS关键词CONTINENTAL UNITED-STATES ; GRASSLAND ENERGY-EXCHANGE ; HEAT WAVES ; STOMATAL CONDUCTANCE ; ATMOSPHERE INTERACTIONS ; SOIL-MOISTURE ; LAND-COVER ; WATER ; DROUGHT ; FOREST
WOS类目Environmental Sciences ; Limnology ; Water Resources
WOS研究方向Environmental Sciences & Ecology ; Marine & Freshwater Biology ; Water Resources
引用统计
文献类型期刊论文
条目标识符http://119.78.100.173/C666/handle/2XK7JSWQ/183957
专题资源环境科学
作者单位1.Hohai Univ, State Key Lab Hydrol Water Resources & Hydraul En, Nanjing, Jiangsu, Peoples R China;
2.Boston Univ, Dept Earth & Environm, Boston, MA 02215 USA;
3.Sun Yat Sen Univ, Sch Geog & Planning, Guangzhou, Guangdong, Peoples R China;
4.Harvard Univ, Dept Earth & Planetary Sci, Boston, MA 02115 USA
推荐引用方式
GB/T 7714
Wang, Peng,Li, Dan,Liao, Weilin,et al. Contrasting Evaporative Responses of Ecosystems to Heatwaves Traced to the Opposing Roles of Vapor Pressure Deficit and Surface Resistance[J]. WATER RESOURCES RESEARCH,2019,55(6):4550-4563.
APA Wang, Peng,Li, Dan,Liao, Weilin,Rigden, Angela,&Wang, Wen.(2019).Contrasting Evaporative Responses of Ecosystems to Heatwaves Traced to the Opposing Roles of Vapor Pressure Deficit and Surface Resistance.WATER RESOURCES RESEARCH,55(6),4550-4563.
MLA Wang, Peng,et al."Contrasting Evaporative Responses of Ecosystems to Heatwaves Traced to the Opposing Roles of Vapor Pressure Deficit and Surface Resistance".WATER RESOURCES RESEARCH 55.6(2019):4550-4563.
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