气候变化领域集成服务门户(CCPortal): Changes in convective available potential energy and convective inhibition under global warming

CCPortal

DOI	10.1175/JCLI-D-19-0461.1
	Changes in convective available potential energy and convective inhibition under global warming
	Chen J.; Dai A.; Zhang Y.; Rasmussen K.L.
发表日期	2020
ISSN	0894-8755
起始页码	2025
结束页码	2050
卷号	33 期号:6
英文摘要	Atmospheric convective available potential energy (CAPE) is expected to increase under greenhouse gas–induced global warming, but a recent regional study also suggests enhanced convective inhibition (CIN) over land although its cause is not well understood. In this study, a global climate model is first evaluated by comparing its CAPE and CIN with reanalysis data, and then their future changes and the underlying causes are examined. The climate model reasonably captures the present-day CAPE and CIN patterns seen in the reanalysis, and projects increased CAPE almost everywhere and stronger CIN over most land under global warming. Over land, the cases or times with medium to strong CAPE or CIN would increase while cases with weak CAPE or CIN would decrease, leading to an overall strengthening in their mean values. These projected changes are confirmed by convection-permitting 4-km model simulations over the United States. The CAPE increase results mainly from increased low-level specific humidity, which leads to more latent heating and buoyancy for a lifted parcel above the level of free convection (LFC) and also a higher level of neutral buoyancy. The enhanced CIN over most land results mainly from reduced low-level relative humidity (RH), which leads to a higher lifting condensation level and a higher LFC and thus more negative buoyancy. Over tropical oceans, the near-surface RH increases slightly, leading to slight weakening of CIN. Over the subtropical eastern Pacific and Atlantic Ocean, the impact of reduced low-level atmospheric lapse rates overshadows the effect of increased specific humidity, leading to decreased CAPE. © 2020 American Meteorological Society.
英文关键词	Buoyancy; Climate models; Global warming; Greenhouse gases; Molecular physics; Potential energy; Tropics; Convective available potential energies; Convective inhibition; Global climate model; Lifting condensation levels; Model simulation; Neutral buoyancy; Specific humidity; Underlying cause; Atmospheric humidity; atmospheric convection; climate effect; climate modeling; global warming; humidity; potential energy; relative humidity; Atlantic Ocean; Atlantic Ocean (East); Pacific Ocean; Pacific Ocean (East); United States
语种	英语
来源期刊	Journal of Climate
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/171410
作者单位	School of Atmospheric Sciences, Nanjing University, Nanjing, China; Department of Atmospheric and Environmental Sciences, University at Albany, State University of New York, Albany, NY, United States; Department of Atmospheric Science, Colorado State University, Fort Collins, CO, United States
推荐引用方式 GB/T 7714	Chen J.,Dai A.,Zhang Y.,et al. Changes in convective available potential energy and convective inhibition under global warming[J],2020,33(6).
APA	Chen J.,Dai A.,Zhang Y.,&Rasmussen K.L..(2020).Changes in convective available potential energy and convective inhibition under global warming.Journal of Climate,33(6).
MLA	Chen J.,et al."Changes in convective available potential energy and convective inhibition under global warming".Journal of Climate 33.6(2020).