Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.5194/acp-18-17225-2018 |
Coarse-mode mineral dust size distributions, composition and optical properties from AER-D aircraft measurements over the tropical eastern Atlantic | |
Ryder, Claire L.1; Marenco, Franco2; Brooke, Jennifer K.2; Estelles, Victor3; Cotton, Richard2; Formenti, Paola4,5; McQuaid, James B.6; Price, Hannah C.7; Liu, Dantong8; Ausset, Patrick4,5; Rosenberg, Phil D.6,9; Taylor, Jonathan W.8; Choularton, Tom8; Bower, Keith8; Coe, Hugh8; Gallagher, Martin8; Crosier, Jonathan8,10; Lloyd, Gary8; Highwood, Eleanor J.1; Murray, Benjamin J.6 | |
2018-12-06 | |
发表期刊 | ATMOSPHERIC CHEMISTRY AND PHYSICS
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ISSN | 1680-7316 |
EISSN | 1680-7324 |
出版年 | 2018 |
卷号 | 18期号:23页码:17225-17257 |
文章类型 | Article |
语种 | 英语 |
国家 | England; Spain; France |
英文摘要 | Mineral dust is an important component of the climate system, affecting the radiation balance, cloud properties, biogeochemical cycles, regional circulation and precipitation, as well as having negative effects on aviation, solar energy generation and human health. Dust size and composition has an impact on all these processes. However, changes in dust size distribution and composition during transport, particularly for coarse particles, are poorly understood and poorly represented in climate models. Here we present new in situ airborne observations of dust in the Saharan Air Layer (SAL) and the marine boundary layer (MBL) at the beginning of its transatlantic transport pathway, from the AERosol Properties - Dust (AER-D) fieldwork in August 2015, within the peak season of North African dust export. This study focuses on coarse-mode dust properties, including size distribution, mass loading, shape, composition, refractive indices and optical properties. Size distributions from 0.1 to 100 mu m diameter (d) are presented, fully incorporating the coarse and giant modes of dust. Within the MBL, mean effective diameter (d(eff)) and volume median diameter (VMD) were 4.6 and 6.0 pm respectively, giant particles with a mode at 20-30 pm were observed, and composition was dominated by quartz and alumino-silicates at d > 1 mu m. Within the SAL, particles larger than 20 mu m diameter were always present up to 5 km altitude, in concentrations over 10(-5) cm(-3), constituting up to 40 % of total dust mass. Mean d(eff) and VMD were 4.0 and 5.5 mu m respectively. Larger particles were detected in the SAL than can be explained by sedimentation theory alone. Coarse-mode composition was dominated by quartz and alumino-silicates; the accumulation mode showed a strong contribution from sulfate-rich and sea salt particles. In the SAL, measured single scattering albedos (SSAs) at 550 nm representing d < 2.5 mu m were 0.93 to 0.98 (mean 0.97). Optical properties calculated for the full size distribution (0.1 < d < 100 mu m) resulted in lower SSAs of 0.91-0.98 (mean 0.95) and mass extinction coefficients of 0.27-0.35 m(2) g(-1) (mean 0.32 m(2) g(-1)). Variability in SSA was mainly controlled by variability in dust composition (principally iron) rather than by variations in the size distribution, in contrast with previous observations over the Sahara where size is the dominant influence. It is important that models are able to capture the variability and evolution of both dust composition and size distribution with transport in order to accurately represent the impacts of dust on climate. These results provide a new SAL dust dataset, fully representing coarse and giant particles, to aid model validation and development. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000452383600001 |
WOS关键词 | FILTER-BASED MEASUREMENTS ; VISIBLE-LIGHT ABSORPTION ; IN-SITU MEASUREMENTS ; COLD POOL OUTFLOWS ; SAHARAN HEAT LOW ; REFRACTIVE-INDEX ; AFRICAN DUST ; DESERT DUST ; NORTH-ATLANTIC ; CAPE-VERDE |
WOS类目 | Environmental Sciences ; Meteorology & Atmospheric Sciences |
WOS研究方向 | Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences |
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/22807 |
专题 | 地球科学 |
作者单位 | 1.Univ Reading, Dept Meteorol, Reading RG6 6BB, Berks, England; 2.Met Off, Exeter, Devon, England; 3.Univ Valencia, Dept Fis Terra & Termodinam, E-46100 Burjassot, Spain; 4.Univ Paris Est Creteil, UMR CNRS 7583, LISA, Creteil, France; 5.Univ Paris Diderot, Inst Pierre Simon Lapl, Creteil, France; 6.Univ Leeds, Sch Earth & Environm, Woodhouse Lane, Leeds LS2 9JT, W Yorkshire, England; 7.Facil Atmospher Airborne Measurements, Cranfield, Beds, England; 8.Univ Manchester, Sch Earth & Environm Sci, Ctr Atmospher Sci, Manchester, Lancs, England; 9.Natl Ctr Atmospher Sci, Fairbairn House,71-75 Clarendon Rd, Leeds LS2 9PH, W Yorkshire, England; 10.Univ Manchester, Natl Ctr Atmospher Sci, Manchester, Lancs, England |
推荐引用方式 GB/T 7714 | Ryder, Claire L.,Marenco, Franco,Brooke, Jennifer K.,et al. Coarse-mode mineral dust size distributions, composition and optical properties from AER-D aircraft measurements over the tropical eastern Atlantic[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2018,18(23):17225-17257. |
APA | Ryder, Claire L..,Marenco, Franco.,Brooke, Jennifer K..,Estelles, Victor.,Cotton, Richard.,...&Murray, Benjamin J..(2018).Coarse-mode mineral dust size distributions, composition and optical properties from AER-D aircraft measurements over the tropical eastern Atlantic.ATMOSPHERIC CHEMISTRY AND PHYSICS,18(23),17225-17257. |
MLA | Ryder, Claire L.,et al."Coarse-mode mineral dust size distributions, composition and optical properties from AER-D aircraft measurements over the tropical eastern Atlantic".ATMOSPHERIC CHEMISTRY AND PHYSICS 18.23(2018):17225-17257. |
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