气候变化领域集成服务门户(CCPortal): Using Observational and Reanalysis Data to Explore the Southern Gulf of California Boundary Layer During the North American Monsoon Onset

CCPortal

DOI	10.1029/2020JD033508
	Using Observational and Reanalysis Data to Explore the Southern Gulf of California Boundary Layer During the North American Monsoon Onset
	Fonseca-Hernandez M.; Turrent C.; Mayor Y.G.; Tereshchenko I.
发表日期	2021
ISSN	2169897X
卷号	126 期号:7
英文摘要	This paper uses rawinsondes and pilot balloon data from the 2004 North American Monsoon (NAM) Experiment, as well as satellite-based products and reanalysis datasets that span 1982–2018, to analyze the mixing mechanisms responsible for the temporal and spatial variations of the Gulf of California (GoC) boundary layer during the NAM onset in the core monsoon region. We show that the regional diurnal cycle is strongly affected by low-level convergence and divergence associated with local land-sea breezes and by the presence of a thermal inversion over the gulf. Earlier starting monsoons have less moisture available for precipitation than those starting later in the calendar year. Therefore, early onset monsoons have less rainfall during their first month, which is a result that is in contrast with previous studies that have analyzed the timing of the NAM but only reported seasonal precipitation totals. The GoC boundary layer height at the time of monsoon onset, found to be controlled by the gulf’s surface temperature, has a significant impact on the precipitation over Sonora, Sinaloa, and southern Arizona. After the erosion of the thermal inversion over the GoC that coincides with the NAM onset, wind shear produced by the region’s unique geographic and topographic features is the largest source of turbulence for the mixing of the boundary layer. Our results suggest that a numerical model used to forecast or analyze NAM precipitation must have enough spatial resolution to adequately reproduce the effects that the GoC’s features have on its complex diurnal circulation systems. © 2021. American Geophysical Union. All Rights Reserved.
英文关键词	Boundary layer mixing; Gulf of California; North American Monsoon onset
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/185371
作者单位	Department of Physical Oceanography, CICESE, Ensenada, BC, Mexico; Physics Department, University of Guadalajara, Guadalajara, JA, Mexico
推荐引用方式 GB/T 7714	Fonseca-Hernandez M.,Turrent C.,Mayor Y.G.,et al. Using Observational and Reanalysis Data to Explore the Southern Gulf of California Boundary Layer During the North American Monsoon Onset[J],2021,126(7).
APA	Fonseca-Hernandez M.,Turrent C.,Mayor Y.G.,&Tereshchenko I..(2021).Using Observational and Reanalysis Data to Explore the Southern Gulf of California Boundary Layer During the North American Monsoon Onset.Journal of Geophysical Research: Atmospheres,126(7).
MLA	Fonseca-Hernandez M.,et al."Using Observational and Reanalysis Data to Explore the Southern Gulf of California Boundary Layer During the North American Monsoon Onset".Journal of Geophysical Research: Atmospheres 126.7(2021).