气候变化领域集成服务门户(CCPortal): Examination of Global Midlatitude Atmospheric River Lifecycles Using an Object-Oriented Methodology

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DOI	10.1029/2020JD033425
	Examination of Global Midlatitude Atmospheric River Lifecycles Using an Object-Oriented Methodology
	Shearer E.J.; Nguyen P.; Sellars S.L.; Analui B.; Kawzenuk B.; Hsu K.-L.; Sorooshian S.
发表日期	2020
ISSN	2169897X
卷号	125 期号:22
英文摘要	Tracking atmospheric rivers (ARs) across their lifecycles is a field of recent interest with a multitude of emerging methodologies. The CONNected-objECT (CONNECT) algorithm is adapted for the tracking of global midlatitude AR lifecycles and associated precipitation by implementing a seeded region growing segmentation algorithm, creating the AR-CONNECT algorithm. To facilitate the permissiveness of the methodology, AR-CONNECT is without hard-coded geometric criteria yet is still shown to extract synoptic-scale elongated objects >99.99% of the time. One of the consequences of the methodology is the ability to occasionally track atmospheric water vapor anomalies before evolving into AR geometries, effectively tracking AR genesis further back than other studies. With the aid of subdaily satellite-derived rain data, we investigate the climatology, trends, and patterns of AR lifecycles from 1983–2016 and compare with other AR tracking studies. We find that AR frequency, genesis, and terminus locations are in generally good agreement with other AR tracking methodologies, though with key differences, and that AR frequencies in each hemisphere are determined by the number of AR hotspots. Furthermore, we uncover evidence that certain AR characteristics, such as frequency, areal extent, and duration, show evidence of increasing trends. Midlatitude precipitation uncovered by AR-CONNECT shows contributions up to 50% over land and 65% over the ocean. Trend analysis of AR precipitation shows an increase in precipitation associated with ARs propagated by the Southern Jet Stream and ARs that traverse over the Sahara Desert, among others, but is determined not to be a driver of changes in global precipitation. ©2020. American Geophysical Union. All Rights Reserved.
英文关键词	atmospheric river tracking; atmospheric rivers; hydroclimate; hydrometeorology; object-oriented analysis; synoptic-scale meteorology
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/185633
作者单位	Center for Hydrometeorology and Remote Sensing (CHRS), Department of Civil and Environmental Engineering, Henry Samueli School of Engineering, University of California, Irvine, Irvine, CA, United States; Qualcomm Institute, California Institute of Telecommunications and Information Technology (Calit2), University of California, San Diego, San Diego, CA, United States; Center for Western Weather and Water Extremes (CW3E), Scripps Institute of Oceanography, University of California, San Diego, San Diego, CA, United States; Department of Earth Systems Science, University of California, Irvine, Irvine, CA, United States
推荐引用方式 GB/T 7714	Shearer E.J.,Nguyen P.,Sellars S.L.,et al. Examination of Global Midlatitude Atmospheric River Lifecycles Using an Object-Oriented Methodology[J],2020,125(22).
APA	Shearer E.J..,Nguyen P..,Sellars S.L..,Analui B..,Kawzenuk B..,...&Sorooshian S..(2020).Examination of Global Midlatitude Atmospheric River Lifecycles Using an Object-Oriented Methodology.Journal of Geophysical Research: Atmospheres,125(22).
MLA	Shearer E.J.,et al."Examination of Global Midlatitude Atmospheric River Lifecycles Using an Object-Oriented Methodology".Journal of Geophysical Research: Atmospheres 125.22(2020).