气候变化领域集成服务门户(CCPortal): Modeling coarse and giant desert dust particles

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DOI	10.5194/acp-22-12727-2022
	Modeling coarse and giant desert dust particles
	Drakaki, Eleni; Amiridis, Vassilis; Tsekeri, Alexandra; Gkikas, Antonis; Proestakis, Emmanouil; Mallios, Sotirios; Solomos, Stavros; Spyrou, Christos; Marinou, Eleni; Ryder, Claire L.; Bouris, Demetri; Katsafados, Petros
发表日期	2022
ISSN	1680-7316
EISSN	1680-7324
起始页码	12727
结束页码	12748
卷号	22 期号:18 页码:22
英文摘要	Dust particles larger than 20 mu m in diameter have been regularly observed to remain airborne during long-range transport. In this work, we modify the parameterization of the mineral dust cycle in the GOCART-AFWA dust scheme of WRFV4.2.1 to also include such coarse and giant particles, and we further discuss the underlying misrepresented physical mechanisms which hamper the model in reproducing adequately the transport of the coarse and giant mineral particles. The initial particle size distribution is constrained by observations over desert dust sources. Furthermore, the Stokes drag coefficient has been updated to account for realistic dust particle sizes (Re < 10(5)). The new code was applied to simulate dust transport over Cabo Verde in August 2015 (AER-D campaign). Model results are evaluated against airborne dust measurements and the CALIPSO-LIVAS pure dust product. The results show that the modeled lifetimes of the coarser particles are shorter than those observed. Several sensitivity runs are performed by reducing artificially the particles' settling velocities in order to compensate underrepresented mechanisms, such as the non-spherical aerodynamics, in the relevant parameterization schemes. Our simulations reveal that particles with diameters of 5.5-17 and 40-100 mu m are better represented under the assumption of an 80 % reduction in the settling velocity (UR80), while particles with sizes ranging between 17 and 40 mu m are better represented in a 60 % reduction in settling velocity (UR60) scenario. The overall statistical analysis indicates that the best agreement with airborne in situ measurements downwind (Cabo Verde) is achieved with a 40 % reduction in settling velocity (UR40). Moreover, the UR80 experiment improves the representation of the vertical structure of the dust layers as those are captured by the CALIPSO-LIVAS vertically resolved pure dust observations. The current study highlights the necessity of upgrading the existing model parameterization schemes of the dust life-cycle components towards improving the assessment of the dust-related impacts within the Earth-atmosphere system.
学科领域	Environmental Sciences; Meteorology & Atmospheric Sciences
语种	英语
WOS研究方向	Environmental Sciences & Ecology ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000861476300001
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/273608
作者单位	National Observatory of Athens; Academy of Athens; Helmholtz Association; German Aerospace Centre (DLR); University of Reading; National Technical University of Athens
推荐引用方式 GB/T 7714	Drakaki, Eleni,Amiridis, Vassilis,Tsekeri, Alexandra,et al. Modeling coarse and giant desert dust particles[J],2022,22(18):22.
APA	Drakaki, Eleni.,Amiridis, Vassilis.,Tsekeri, Alexandra.,Gkikas, Antonis.,Proestakis, Emmanouil.,...&Katsafados, Petros.(2022).Modeling coarse and giant desert dust particles.ATMOSPHERIC CHEMISTRY AND PHYSICS,22(18),22.
MLA	Drakaki, Eleni,et al."Modeling coarse and giant desert dust particles".ATMOSPHERIC CHEMISTRY AND PHYSICS 22.18(2022):22.