气候变化领域集成服务门户(CCPortal): Dryline characteristics in North America’s historical and future climates

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DOI	10.1007/s00382-021-05800-1
	Dryline characteristics in North America’s historical and future climates
	Scaff L.; Prein A.F.; Li Y.; Clark A.J.; Krogh S.A.; Taylor N.; Liu C.; Rasmussen R.M.; Ikeda K.; Li Z.
发表日期	2021
ISSN	0930-7575
起始页码	245
结束页码	257
英文摘要	Drylines are atmospheric boundaries separating dry from moist air that can initiate convection. Potential changes in the location, frequency, and characteristics of drylines in future climates are unknown. This study applies a multi-parametric algorithm to objectively identify and characterize the dryline in North America using convection-permitting regional climate model simulations with 4-km horizontal grid spacing for 13-years under a historical and a pseudo-global warming climate projection by the end of the century. The dryline identification is successfully achieved with a set of standardized algorithm parameters across the lee side of the Rocky Mountains from the Canadian Rockies to the Sierra Madres in Mexico. The dryline is present 27% of the days at 00 UTC between April and September in the current climate, with a mean humidity gradient magnitude of 0.16 g−1 kg−1 km−1. The seasonal cycle of drylines peak around April and May in the southern Plains, and in June and July in the northern Plains. In the future climate, the magnitude and frequency of drylines increase 5% and 13%, correspondingly, with a stronger intensification southward. Future drylines strengthen during their peak intensity in the afternoon in the Southern U.S. and Northeast Mexico. Drylines also show increasing intensities in the morning with future magnitudes that are comparable to peak intensities found in the afternoon in the historical climate. Furthermore, an extension of the seasonality of intense drylines could produce end-of-summer drylines that are as strong as mid-summer drylines in the current climate. This might affect the seasonality and the diurnal cycle of convective activity in future climates, challenging weather forecasting and agricultural planning. © 2021, The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature.
英文关键词	Convection-permitting modeling; Dryline; Pseudo global warming; Rocky mountains
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/183439
作者单位	Global Institute for Water Security, University of Saskatchewan, 11 Innovation Blvd, Saskatoon, SK S7N 3H5, Canada; NCAR National Center for Atmospheric Research, 3090 Center Green Drive, Boulder, CO 80301, United States; NOAA/OAR/National Severe Storms Laboratory, National Weather Center, Norman, OK 73072, United States; School of Meteorology, University of Oklahoma, Norman, OK 73072, United States; Departamento de Recursos Hídricos, Facultad de Ingeniería Agrícola, Universidad de Concepción, Chillán, 3812120, Chile; Department of Natural Resources and Environmental Science, University of Nevada, Reno, NV 89557, United States; National Lab-West, Meteorological Service of Canada, Environment and Climate Change Canada, Edmonton, AB T6B 1K5, Canada
推荐引用方式 GB/T 7714	Scaff L.,Prein A.F.,Li Y.,等. Dryline characteristics in North America’s historical and future climates[J],2021.
APA	Scaff L..,Prein A.F..,Li Y..,Clark A.J..,Krogh S.A..,...&Li Z..(2021).Dryline characteristics in North America’s historical and future climates.Climate Dynamics.
MLA	Scaff L.,et al."Dryline characteristics in North America’s historical and future climates".Climate Dynamics (2021).