DOI: 10.1002/2016MS000865
Scopus记录号: 2-s2.0-85021211205
论文题名: Imprint of the convective parameterization and sea-surface temperature on large-scale convective self-aggregation
作者: Becker T ; , Stevens B ; , Hohenegger C
刊名: Journal of Advances in Modeling Earth Systems
ISSN: 19422466
出版年: 2017
卷: 9, 期: 2 起始页码: 1488
结束页码: 1505
语种: 英语
英文关键词: Aggregates
; Atmospheric temperature
; Buoyancy
; Heat convection
; Moisture
; Oceanography
; Parameterization
; Submarine geophysics
; Surface properties
; Convective parameterization
; Entrainment rates
; Large-scale circulation
; Radiative-convective equilibrium
; Self aggregation
; Agglomeration
; air-sea interaction
; atmospheric convection
; entrainment
; general circulation model
; global climate
; parameterization
; sea surface temperature
; updraft
英文摘要: Radiative-convective equilibrium simulations with the general circulation model ECHAM6 are used to explore to what extent the dependence of large-scale convective self-aggregation on sea-surface temperature (SST) is driven by the convective parameterization. Within the convective parameterization, we concentrate on the entrainment parameter and show that large-scale convective self-aggregation is independent of SST when the entrainment rate for deep convection is set to zero or when the convective parameterization is removed from the model. In the former case, convection always aggregates very weakly, whereas in the latter case, convection always aggregates very strongly. With a nontrivial representation of convective entrainment, large-scale convective self-aggregation depends nonmonotonically on SST. For SSTs below 295 K, convection is more aggregated the smaller the SST because large-scale moisture convergence is relatively small, constraining convective activity to regions with high wind-induced surface moisture fluxes. For SSTs above 295 K, convection is more aggregated the higher the SST because entrainment is most efficient in decreasing updraft buoyancy at high SSTs, amplifying the moisture-convection feedback. When halving the entrainment rate, convection is less efficient in reducing updraft buoyancy, and convection is less aggregated, in particular at high SSTs. Despite most early work on self-aggregation highlighted the role of nonconvective processes, we conclude that convective self-aggregation and the global climate state are sensitive to the convective parameterization. © 2017. The Authors. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/75799
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: Max Planck Institute for Meteorology, Hamburg, Germany
Recommended Citation:
Becker T,, Stevens B,, Hohenegger C. Imprint of the convective parameterization and sea-surface temperature on large-scale convective self-aggregation[J]. Journal of Advances in Modeling Earth Systems,2017-01-01,9(2)