气候变化领域集成服务门户(CCPortal): High-Elevation Monsoon Precipitation Processes in the Central Andes of Peru

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DOI	10.1029/2020JD032947
	High-Elevation Monsoon Precipitation Processes in the Central Andes of Peru
	Chavez S.P.; Silva Y.; Barros A.P.
发表日期	2020
ISSN	2169897X
卷号	125 期号:24
英文摘要	Measurements at the high-elevation Lamar Observatory in the Mantaro Valley (MV) in the Central Andes of Peru demonstrate a diurnal cycle of precipitation characterized by convective rainfall during the afternoon and nighttime stratiform rainfall with embedded convection. Wet season data (2016–2018) reveal long-duration (6–12 hr) shallow precipitating systems (LDPS) that produced about 17% of monsoon rainfall in 2016 and 2018 associated with El Niño and La Niña, respectively. The LPDS fraction of monsoon rainfall doubles to 35% with weekly recurrence in 2017 under El Niño Costero (coastal) conditions. LDPS occur under favorable moisture conditions dictated by the South America (SA) Low-Level Jet (SALLJ) and Cold Air Intrusions (CAIs). Backward trajectory analysis shows that precipitable water sustains >80% of seasonal precipitation and ties the LPDS to particular moisture source regions in the eastern Andes foothills 1–2 days in advance, enhanced by increased moisture supply in the midtroposphere. Higher frequency of CAIs and enhanced midlevel moisture convergence along CAI fronts explain the increased LDPS frequency during the 2017 El Niño Costero. These findings highlight the functional role of the Andes morphology in organizing moisture supply to high-elevation precipitation systems on the orographic envelope. Analysis of the Global Precipitation Measurement (GPM) mission satellite-based radar observations points to challenges to precipitation detection and estimation in this region as the GPM clutter-free height (~1–2 km AGL) exceeds the depth of shallow precipitation systems in the MV. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	Amazon; Andes; ENSO; microphysics; orographic precipitation; precipitation radar
语种	英语
来源期刊	Journal of Geophysical Research: Atmospheres
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/185569
作者单位	Department of Civil and Environmental Engineering, Duke University, Durham, NC, United States; Peruvian Geophysical Institute, Ate, Peru
推荐引用方式 GB/T 7714	Chavez S.P.,Silva Y.,Barros A.P.. High-Elevation Monsoon Precipitation Processes in the Central Andes of Peru[J],2020,125(24).
APA	Chavez S.P.,Silva Y.,&Barros A.P..(2020).High-Elevation Monsoon Precipitation Processes in the Central Andes of Peru.Journal of Geophysical Research: Atmospheres,125(24).
MLA	Chavez S.P.,et al."High-Elevation Monsoon Precipitation Processes in the Central Andes of Peru".Journal of Geophysical Research: Atmospheres 125.24(2020).