DOI: 10.1002/2017MS001157
Scopus记录号: 2-s2.0-85044945097
论文题名: The Role of Convective Gustiness in Reducing Seasonal Precipitation Biases in the Tropical West Pacific
作者: Harrop B ; E ; , Ma P ; -L ; , Rasch P ; J ; , Neale R ; B ; , Hannay C
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2018
语种: 英语
英文关键词: Evaporation
; Tropics
; Convective precipitation
; General circulation model
; Model parameterization
; Northern Hemispheres
; Seasonal precipitations
; Surface evaporation
; Surface wind fields
; Tropical precipitation
; Climate models
英文摘要: Precipitation is an important climate quantity that is critically relevant to society. In spite of intense efforts, significant precipitation biases remain in most climate models. One pervasive and persistent bias found in many general circulation models occurs in the Tropical West Pacific where northern hemisphere summer-time precipitation is often underestimated compared to observations. Using the DOE-E3SM model, the inclusion of a missing process, convective gustiness, is shown to reduce those biases through a net increase in surface evaporation. Gustiness in surface wind fields is assumed to arise empirically in proportion to the intensity of convective precipitation. The increased evaporation can be treated as an increase in the moist static energy forcing into the atmosphere. A Normalized Gross Moist Stability (NGMS) framework (which characterizes the relationship between convective forcing and convective response) is used to explore the processes responsible for the precipitation bias, and the impact of the gustiness parameterization in reducing that bias. Because the NGMS of the Tropical West Pacific is less than unity in the E3SMv1 model, the increase in energy forcing amplifies the increase in precipitation to exceed that of the evaporative flux. Convective gustiness favors increased precipitation in regions where the resolved surface winds are weak and convection is present. © 2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75665
Appears in Collections: 影响、适应和脆弱性 气候变化与战略
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作者单位: Atmospheric Sciences and Global Change DivisionPacific Northwest National LaboratoryRichland, Washington USA; National Center for Atmospheric ResearchBoulder, Colorado USA
Recommended Citation:
Harrop B,E,, Ma P,et al. The Role of Convective Gustiness in Reducing Seasonal Precipitation Biases in the Tropical West Pacific[J]. Journal of Advances in Modeling Earth Systems,2018-01-01