气候变化领域集成服务门户(CCPortal): The relationship between precipitation and precipitable water in CMIP6 simulations and implications for tropical climatology and change

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DOI	10.1175/JCLI-D-20-0211.1
	The relationship between precipitation and precipitable water in CMIP6 simulations and implications for tropical climatology and change
	Hagos S.M.; Leung L.R.; Garuba O.A.; Demott C.; Harrop B.; Lu J.; Ahn M.-S.
发表日期	2021
ISSN	0894-8755
起始页码	1587
结束页码	1600
卷号	34 期号:5
英文摘要	It is well documented that over the tropical oceans, column-integrated precipitable water (pw) and precipitation (P) have a nonlinear relationship. In this study moisture budget analysis is used to examine this P–pw relationship in a normalized precipitable water framework. It is shown that the parameters of the nonlinear relationship depend on the vertical structure of moisture convergence. Specifically, the precipitable water values at which precipitation is balanced independently by evaporation versus by moisture convergence define a critical normalized precipitable water, pwnc. This is a measure of convective inhibition that separates tropical precipitation into two regimes: a local evaporation-controlled regime with widespread drizzle and a precipitable water–controlled regime. Most of the 17 CMIP6 historical simulations examined here have higher pwnc compared to ERA5, and more frequently they operate in the drizzle regime. When compared to observations, they overestimate precipitation over the high-evaporation oceanic regions off the equator, thereby producing a ‘‘double ITCZ’’ feature, while underestimating precipitation over the large tropical landmasses and over the climatologically moist oceanic regions near the equator. The responses to warming under the SSP585 scenario are also examined using the normalized precipitable water framework. It is shown that the critical normalized precipitable water value at which evaporation versus moisture convergence balance precipitation decreases as a result of the competing dynamic and thermodynamic responses to warming, resulting in an increase in drizzle and total precipitation. Statistically significant historical trends corresponding to the thermodynamic and dynamic changes are detected in ERA5 and in low-intensity drizzle precipitation in the PERSIANN precipitation dataset. Ó 2021 American Meteorological Society. For information regarding reuse of this content and general copyright information, consult the AMS Copyright Policy
英文关键词	Budget control; Evaporation; Moisture; Oceanography; Tropics; American meteorological societies; Convective inhibition; Copyright informations; Historical simulation; Moisture convergence; Non-linear relationships; Tropical precipitation; Vertical structures; Water conservation
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/170919
作者单位	Pacific Northwest National Laboratory, Richland, WA, United States; Colorado State University, Fort Collins, CO, United States; University of Washington, Seattle, WA, United States
推荐引用方式 GB/T 7714	Hagos S.M.,Leung L.R.,Garuba O.A.,et al. The relationship between precipitation and precipitable water in CMIP6 simulations and implications for tropical climatology and change[J],2021,34(5).
APA	Hagos S.M..,Leung L.R..,Garuba O.A..,Demott C..,Harrop B..,...&Ahn M.-S..(2021).The relationship between precipitation and precipitable water in CMIP6 simulations and implications for tropical climatology and change.Journal of Climate,34(5).
MLA	Hagos S.M.,et al."The relationship between precipitation and precipitable water in CMIP6 simulations and implications for tropical climatology and change".Journal of Climate 34.5(2021).