DOI: 10.1029/2018JD028806
Scopus记录号: 2-s2.0-85052247976
论文题名: Wet Dust Deposition Across Texas During the 2012 Drought: An Overlooked Pathway for Elemental Flux to Ecosystems
作者: Ponette-González A.G. ; Collins J.D. ; Manuel J.E. ; Byers T.A. ; Glass G.A. ; Weathers K.C. ; Gill T.E.
刊名: Journal of Geophysical Research: Atmospheres
ISSN: 2169897X
出版年: 2018
卷: 123, 期: 15 起始页码: 8238
结束页码: 8254
语种: 英语
英文关键词: drought
; dust-in-rain
; elemental fluxes
; proton-induced X-ray emission
; rainwater chemistry
; Texas
英文摘要: Airborne dust can alter ecosystem productivity and biogeochemical cycling by enhancing atmospheric nutrient and pollutant deposition. Wet dust deposition (dust-in-rain) is less frequently quantified than dry deposition but represents a potentially significant flux to ecosystems. We quantified dust-in-rain event frequency, dust influence on rainwater ionic and elemental composition, and wet dissolved and particulate deposition during weeks affected by dust-in-rain and all other weeks (background samples) at two sites across Texas (one arid, Guadalupe Mountains, and one humid, Gulf coastal prairie) during the centennial-scale 2012 drought. Although dust-in-rain was sporadic, a clear dust signature was evident in rainwater. Compared to background samples, crustal species (Fe and Mn) were more prevalent than anthropogenic species (Cu and Zn) in dust-in-rain. Volume-weighted mean rainwater concentrations of K+, Na+, and Cl− and of all particulate elements were also significantly greater in dust-in-rain than in background samples. In the Guadalupe Mountains, West Texas, dust-in-rain contributed nearly 50% of annual wet dissolved Na+ and Cl− and 22–35% of dissolved Ca2+, Mg2+, K+, and PO4 3− deposition. In the Gulf coastal prairie, East Texas, dust-in-rain delivered 19%, 13%, and 9% of annual wet dissolved PO4 3−, Ca2+, and K+ deposition, respectively. A major proportion of annual wet particulate deposition (>56% in Guadalupe Mountains and ~30% in Gulf coastal prairie) similarly occurred with dust-in-rain. Our findings show that infrequent dust-in-rain events constitute an important but overlooked pathway for elemental flux to ecosystems in arid source and humid receptor sites during severe drought. Quantifying these fluxes is crucial to determine dust impacts on ecosystem processes. ©2018. American Geophysical Union. All Rights Reserved. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/113284
Appears in Collections: 气候减缓与适应
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作者单位: Department of Geography and the Environment, University of North Texas, Denton, TX, United States; Department of Geosciences, Middle Tennessee State University, Murfreesboro, TN, United States; Ion Beam Modification and Analysis Laboratory, Department of Physics, University of North Texas, Denton, TX, United States; Cary Institute of Ecosystem Studies, Millbrook, NY, United States; Department of Geological Sciences and Environmental Science and Engineering Program, University of Texas at El Paso, El Paso, TX, United States
Recommended Citation:
Ponette-González A.G.,Collins J.D.,Manuel J.E.,et al. Wet Dust Deposition Across Texas During the 2012 Drought: An Overlooked Pathway for Elemental Flux to Ecosystems[J]. Journal of Geophysical Research: Atmospheres,2018-01-01,123(15)