DOI: 10.1002/2017MS001218
Scopus记录号: 2-s2.0-85045299854
论文题名: Nonrotating Convective Self-Aggregation in a Limited Area AGCM
作者: Arnold N ; P ; , Putman W ; M
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2018
语种: 英语
英文关键词: Atmospheric humidity
; Boundary layers
; Budget control
; Clouds
; Cluster analysis
; Feedback
; Oceanography
; Parameterization
; Surface waters
; Wind
; Atmospheric general circulation models
; Boundary layer temperature
; Goddard earth observing systems
; Horizontal grid spacing
; Long-wave radiation
; Moist static energy
; Sea surface temperature (SST)
; Tropospheric humidity
; Agglomeration
英文摘要: We present nonrotating simulations with the Goddard Earth Observing System (GEOS) atmospheric general circulation model (AGCM) in a square limited area domain over uniform sea surface temperature. As in previous studies, convection spontaneously aggregates into humid clusters, driven by a combination of radiative and moisture-convective feedbacks. The aggregation is qualitatively independent of resolution, with horizontal grid spacing from 3 to 110 km, with both explicit and parameterized deep convection. A budget for the spatial variance of column moist static energy suggests that longwave radiative and surface flux feedbacks help establish aggregation, while the shortwave feedback contributes to its maintenance. Mechanism-denial experiments confirm that aggregation does not occur without interactive longwave radiation. Ice cloud radiative effects help support the humid convecting regions but are not essential for aggregation, while liquid clouds have a negligible effect. Removing the dependence of parameterized convection on tropospheric humidity reduces the intensity of aggregation but does not prevent the formation of dry regions. In domain sizes less than (5,000 km)2, the aggregation forms a single cluster, while larger domains develop multiple clusters. Larger domains initialized with a single large cluster are unable to maintain them, suggesting an upper size limit. Surface wind speed increases with domain size, implying that maintenance of the boundary layer winds may limit cluster size. As cluster size increases, large boundary layer temperature anomalies develop to maintain the surface pressure gradient, leading to an increase in the depth of parameterized convective heating and an increase in gross moist stability. © 2018. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75672
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: Goddard Earth Sciences Technology and ResearchUniversities Space Research AssociationColumbia, MD USA; Global Modeling and Assimilation OfficeNASA Goddard Space Flight CenterGreenbelt, MD USA
Recommended Citation:
Arnold N,P,, Putman W,et al. Nonrotating Convective Self-Aggregation in a Limited Area AGCM[J]. Journal of Advances in Modeling Earth Systems,2018-01-01