DOI: 10.1002/2015GL065693
论文题名: Long-range transport across the Atlantic in summertime does not enhance the hygroscopicity of African mineral dust
作者: Denjean C. ; Caquineau S. ; Desboeufs K. ; Laurent B. ; Maille M. ; Quiñones Rosado M. ; Vallejo P. ; Mayol-Bracero O.L. ; Formenti P.
刊名: Geophysical Research Letters
ISSN: 0094-9394
EISSN: 1944-9125
出版年: 2015
卷: 42, 期: 18 起始页码: 7835
结束页码: 7843
语种: 英语
英文关键词: hygroscopicity
; long-range transport
; mineral dust
; mixing state
; optical properties
; particle shape
Scopus关键词: Agglomeration
; Aggregates
; Chloride minerals
; Minerals
; Mixing
; Optical properties
; hygroscopicity
; Long range transport
; Mineral dust
; Mixing state
; Particle shape
; Dust
; chemical composition
; chloride
; dust
; extinction
; hygroscopicity
; long range transport
; mineral
; optical property
; particulate matter
; relative humidity
; sea salt
; sulfate
; Africa
; Atlantic Ocean
; Caribbean Islands
英文摘要: We present the first direct evidence that the hygroscopic properties of super micron (>1-μm) African dust particles did not change despite undergoing long-range transport across the Atlantic toward the Caribbean. Concurrent measurements of chemical composition show that most of mineral dust was chemically unprocessed and externally mixed. A minor portion of mineral dust was internally mixed with sulfate and chloride (~13-24% by number) or aggregated with sea-salt particles (~3-6%). Only dust particles aggregated with sea salt showed significant hygroscopic growth above 75% relative humidity (RH), resulting in a decrease in extinction mass efficiency by up to a factor 2.2. All other dust particles did not take up significant amounts of water when exposed to up to 94% RH. These results demonstrate that the direct radiative effect of African dust in this region remained independent of RH and an external mixing state could be considered for evaluating the climate effects of dust. © 2015 American Geophysical Union. All Rights Reserved. URL: https://www.scopus.com/inward/record.uri?eid=2-s2.0-84945219209&doi=10.1002%2f2015GL065693&partnerID=40&md5=dc843a4331da2dcadb8253f57356e4fe
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/9009
Appears in Collections: 科学计划与规划 气候变化与战略
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作者单位: Laboratoire Interuniversitaire des Systèmes Atmosphériques, UMR-CNRS 7583, Université Paris-Est-Créteil et Université Paris Diderot, Institut Pierre-Simon Laplace, Créteil, France
Recommended Citation:
Denjean C.,Caquineau S.,Desboeufs K.,et al. Long-range transport across the Atlantic in summertime does not enhance the hygroscopicity of African mineral dust[J]. Geophysical Research Letters,2015-01-01,42(18).