气候变化领域集成服务门户(CCPortal): Trends in seasonal precipitation extremes and associated temperatures along continental Chile

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DOI	10.1007/s00382-024-07127-z
	Trends in seasonal precipitation extremes and associated temperatures along continental Chile
	Lagos-Zuniga, Miguel; Mendoza, Pablo A.; Campos, Diego; Rondanelli, Roberto
发表日期	2024
ISSN	0930-7575
EISSN	1432-0894
英文摘要	We characterize trends in maximum seasonal daily precipitation (seasonal Rx1day), minimum (Tn), and maximum (Tx) daily temperatures during days with precipitation over continental Chile for the period 1979-2017, using surface stations and the AgERA5 gridded product derived from the ERA5 reanalysis dataset. We also examine seasonal trends of Sea Surface Temperature (SST), Precipitable Water (PW), Convective Available Potential Energy (CAPE), Eddy Kinetic Energy (EKE), Atmospheric Rivers (ARs) frequency, and upper air observations to seek possible mechanisms that explain precipitation trends. Our results show an increase in seasonal Rx1day during fall in the south part of Northern Chile (15-30 degrees S) and during fall and winter in Austral Chile (45-57 degrees S), and mostly negative trends in Central Chile (30-36 degrees S), where a few locations with positive trends along the coast during summer. Temperature trends presented cooling patterns north of 33 degrees S in almost all the seasons (< -2 degrees C/dec), while warming trends prevail south of 38 degrees S (> 1 degrees C/dec). The highest values in Tn trends are obtained on the western slopes of the Andes around 30 degrees S. We also explore temperature scaling in surface stations, finding strong positive super Clausius Clapeyron with Tn, especially between fall and spring in the 33-40 degrees S region. Sounding observations in five stations across Chile suggest warming trends at 23.5 degrees, 33 degrees S, and 53 degrees S, with a stabilization effect by enhanced warming in the upper troposphere, while presenting cooling trends in Puerto Montt (41.5 degrees S). Seasonal trends in PW reveal moistening along southern Peru and northern Chile during spring and summer. Positive trends in CAPE are observed over 35-40 degrees S (austral summer and fall) and the north Altiplano (autumn). SST analyses reveal strong cooling around 30 degrees S in winter, which may explain the negative trends in seasonal Rx1day in central Chile. A warming spot on the northern Peruvian coast during fall may be responsible for humidification in front of Northern Chile, particularly during summer and fall. Positive EKE trends are detected south of 40 degrees S, being stronger and reaching almost all of the coast during spring. ARs frequency unveils negative trends up to -5 days/dec during summer and positive trends of 1 day/dec in 40 degrees- 50 degrees S coastal regions during spring. More generally, the results presented here shed light on the main large-scale processes driving recent trends in precipitation extremes across continental Chile.
英文关键词	Seasonal maximum daily precipitation; Freezing level; Warm precipitation; Trends
语种	英语
WOS研究方向	Meteorology & Atmospheric Sciences
WOS类目	Meteorology & Atmospheric Sciences
WOS记录号	WOS:001153723600001
来源期刊	CLIMATE DYNAMICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/306445
作者单位	Universidad de Chile; Universidad de Chile; Universidad de Chile; Universitat Politecnica de Catalunya; Barcelona Supercomputer Center (BSC-CNS); Universidad de Chile
推荐引用方式 GB/T 7714	Lagos-Zuniga, Miguel,Mendoza, Pablo A.,Campos, Diego,et al. Trends in seasonal precipitation extremes and associated temperatures along continental Chile[J],2024.
APA	Lagos-Zuniga, Miguel,Mendoza, Pablo A.,Campos, Diego,&Rondanelli, Roberto.(2024).Trends in seasonal precipitation extremes and associated temperatures along continental Chile.CLIMATE DYNAMICS.
MLA	Lagos-Zuniga, Miguel,et al."Trends in seasonal precipitation extremes and associated temperatures along continental Chile".CLIMATE DYNAMICS (2024).