Universität zu Köln

Reyers, Mark, Boehm, Christoph, Knarr, Leon, Shao, Yaping and Crewell, Susanne ORCID: 0000-0003-1251-5805 (2021). Synoptic-to-Regional-Scale Analysis of Rainfall in the Atacama Desert (18 degrees-26 degrees S) Using a Long-Term Simulation with WRF. Mon. Weather Rev., 149 (1). S. 91 - 113. BOSTON: AMER METEOROLOGICAL SOC. ISSN 1520-0493

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Abstract

In this study, reanalysis data and a long-term simulation with the regional climate model WRF (1982-2017; 10 km resolution) is used to analyze synoptic and regional processes associated with rainfall events in the Atacama Desert. Five composites, each with 10 WRF-simulated rainfall events, are studied. They are selected based on a clustering and comprise the top winter events in SouthAtacama (23 degrees-26 degrees S), SoutheastAtacama, and North Atacama (18 degrees-23 degrees S), and the top summer events in North Atacama and Northeast Atacama. Winter rainfall events in South Atacama are mostly associated with strong low pressure systems over the southeast Pacific and atmospheric rivers at their foreside, while cutoff lows occurring anomalously far north facilitate strong rainfall inNorthAtacama. Accordingly, tropical continental areas and the remote tropical and subtropical Pacific are identified as primarymoisture sources, and moisture transport toward theAtacamaDesertmainly takes place in the free troposphere (above 800 hPa). Strong summer rainfall events in North Atacama and Northeast Atacama are associated with a southward displaced Bolivian high. During rainfall events in North Atacama the high is shifted westward when compared to the Northeast Atacama events. Consequently, northern Chile is located at the northern periphery of the Bolivian high and the resulting strong easterlies may push strong convective systems from the Altiplano, toward the Atacama coast. Detailed analyses of individual rainfall events reveal that the most important synoptic patterns associated with rainfall not only control the synoptic-scale moisture transport into the Atacama Desert, but also decisively influence the regional atmospheric circulation.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Reyers, Mark UNSPECIFIED UNSPECIFIED UNSPECIFIED Boehm, Christoph UNSPECIFIED UNSPECIFIED UNSPECIFIED Knarr, Leon UNSPECIFIED UNSPECIFIED UNSPECIFIED Shao, Yaping UNSPECIFIED UNSPECIFIED UNSPECIFIED Crewell, Susanne UNSPECIFIED orcid.org/0000-0003-1251-5805 UNSPECIFIED
URN:	urn:nbn:de:hbz:38-565423
DOI:	10.1175/MWR-D-20-0038.1
Journal or Publication Title:	Mon. Weather Rev.
Volume:	149
Number:	1
Page Range:	S. 91 - 113
Date:	2021
Publisher:	AMER METEOROLOGICAL SOC
Place of Publication:	BOSTON
ISSN:	1520-0493
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ATMOSPHERIC RIVERS; CENTRAL CHILE; WINTER STORM; PRECIPITATION; VARIABILITY; EVENTS; IMPACT; COAST Multiple languages Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/56542