GSTDTAP  > 地球科学
DOI10.5194/acp-17-297-2017
Particle settling and vertical mixing in the Saharan Air Layer as seen from an integrated model, lidar, and in situ perspective
Gasteiger, Josef1,2; Gross, Silke3; Sauer, Daniel3; Haarig, Moritz4; Ansmann, Albert4; Weinzierl, Bernadett2
2017-01-05
发表期刊ATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN1680-7316
EISSN1680-7324
出版年2017
卷号17期号:1
文章类型Article
语种英语
国家Germany; Austria
英文摘要

Long-range transport of aerosol in the Saharan Air Layer (SAL) across the Atlantic plays an important role for weather, climate, and ocean fertilization. However, processes occurring within the SAL and their effects on aerosol properties are still unclear. In this work we study particle settling and vertical mixing within the SAL based on measured and modeled vertical aerosol profiles in the upper 1 km of the transported SAL. We use ground-based lidar measurements and airborne particle counter measurements over the western Atlantic, collected during the SALTRACE campaign, as well as space-based CALIOP lidar measurements from Africa to the western Atlantic in the summer season. In our model we take account of the optical properties and the Stokes gravitational settling of irregularly shaped Saharan dust particles.


We test two hypotheses about the occurrence of vertical mixing within the SAL over the Atlantic to explain the aerosol profiles observed by the lidars and the particle counter. Our first hypothesis (H1) assumes that no mixing occurs in the SAL leading to a settling-induced separation of particle sizes. The second hypothesis (H2) assumes that vertical mixing occurs in the SAL allowing large super-micron dust particles to stay airborne longer than without mixing.


The uncertainties of the particle linear depolarization ratio (delta(l)) profiles measured by the ground-based lidars are comparable to the modeled differences between H1 and H2 and do not allow us to conclude which hypothesis fits better. The SALTRACE in situ data on size-resolved particle number concentrations show a presence of large particles near the SAL top that is inconsistent with H1. The analysis of the CALIOP measurements also reveals that the average delta(l) profile over the western Atlantic is inconsistent with H1. Furthermore, it was found that the average delta(l) profile in the upper 1 km of the SAL does not change along its transport path over the Atlantic. These findings give evidence that vertical mixing within the SAL is a common phenomenon with significant consequences for the evolution of the size distribution of super-micron dust particles during transport over the Atlantic. Further research is needed to precisely characterize the processes that are relevant for this phenomenon.


领域地球科学
收录类别SCI-E
WOS记录号WOS:000392404400003
WOS关键词LINEAR DEPOLARIZATION RATIO ; MINERAL DUST AEROSOL ; OPTICAL-PROPERTIES ; SIZE DISTRIBUTION ; TRANSPORT ; CLOUD ; SHAPE ; AIRBORNE ; SAMUM-1 ; STATE
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/23870
专题地球科学
作者单位1.Ludwig Maximilians Univ Munchen, Meteorol Inst, Munich, Germany;
2.Univ Vienna, Fac Phys, Vienna, Austria;
3.Deutsch Zentrum Luft & Raumfahrt, Inst Phys Atmosphare, Oberpfaffenhofen, Germany;
4.Leibniz Inst Tropospher Res, Leipzig, Germany
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GB/T 7714
Gasteiger, Josef,Gross, Silke,Sauer, Daniel,et al. Particle settling and vertical mixing in the Saharan Air Layer as seen from an integrated model, lidar, and in situ perspective[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2017,17(1).
APA Gasteiger, Josef,Gross, Silke,Sauer, Daniel,Haarig, Moritz,Ansmann, Albert,&Weinzierl, Bernadett.(2017).Particle settling and vertical mixing in the Saharan Air Layer as seen from an integrated model, lidar, and in situ perspective.ATMOSPHERIC CHEMISTRY AND PHYSICS,17(1).
MLA Gasteiger, Josef,et al."Particle settling and vertical mixing in the Saharan Air Layer as seen from an integrated model, lidar, and in situ perspective".ATMOSPHERIC CHEMISTRY AND PHYSICS 17.1(2017).
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