气候变化领域集成服务门户(CCPortal): Kinematics and dynamics of the stratocumulus average diurnal dissipation process at Atacama Desert

CCPortal

DOI	10.1016/j.atmosres.2021.105523
	Kinematics and dynamics of the stratocumulus average diurnal dissipation process at Atacama Desert
	Luccini E.; Rivas M.
发表日期	2021
ISSN	0169-8095
卷号	255
英文摘要	Stratocumulus-type clouds constitute a stable system over the Southeast Pacific Ocean. Their phenomenology is well known particularly over the ocean, but a quantitative analysis of their diurnal cycle over the Pacific continental coastal desert strip of South America remained unaddressed. In this work, the stratocumulus average morning dissipation process at two sites in the Atacama Desert is documented through simple empirical mathematical equations. Based on the change rate analysis of the visible cloud optical depth (COD) inferred from solar irradiance measurements, the kinematics and the dynamics of the stratocumulus dissipation process is established, showing that it develops at an average constant “acceleration of dissipation” (d2COD/dt2) of about −3.3 h−2, equivalent to a cloud geometrical vertical thickness change at an average constant “acceleration of thinning” of about −40 m/h2. Towards the end of the dissipation process when cloudiness vanishes, the average “velocity of dissipation” (dCOD/dt) and “velocity of thinning” round −16 h−1 and −175 m/h, respectively. A simple plane-parallel optical and geometrical model explains the average behavior of the phenomenon in the region on a wholly radiative base, with an absorbed fraction of solar irradiance acting as exclusive driver of the average dissipation process. About 13 kJ/m2 of net irradiation is needed to change the COD of the stratocumulus deck by one unit. The progressive morning cloud dissipation from the land on the east towards the sea on the west is evidenced. The analysis of the cloud effective transmittance and a full set of checks, including test of robustness, support these results and their interpretation. © 2021 Elsevier B.V.
英文关键词	Atacama; Diurnal dissipation process; Dynamics; Kinematics; Solar radiation; Stratocumulus
来源期刊	Atmospheric Research
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/236797
作者单位	Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Centro de Excelencia en Productos y Procesos de Córdoba (CEPROCOR), Pabellón Ceprocor (X5164), Sede Santa María de Punilla, Córdoba, Argentina; Pontificia Universidad Católica Argentina, Facultad de Química e Ingeniería del Rosario, Av. Pellegrini 3314 (2000), Rosario, Santa Fe, Argentina; Laboratorio de Radiación Solar Ultravioleta, Departamento de Física, Facultad de Ciencias, Universidad de Tarapacá, Casilla 7-D, Arica, Chile
推荐引用方式 GB/T 7714	Luccini E.,Rivas M.. Kinematics and dynamics of the stratocumulus average diurnal dissipation process at Atacama Desert[J],2021,255.
APA	Luccini E.,&Rivas M..(2021).Kinematics and dynamics of the stratocumulus average diurnal dissipation process at Atacama Desert.Atmospheric Research,255.
MLA	Luccini E.,et al."Kinematics and dynamics of the stratocumulus average diurnal dissipation process at Atacama Desert".Atmospheric Research 255(2021).