Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0079.1 |
Modeling the Transient Response of Tropical Convection to Mesoscale SST Variations | |
Skyllingstad, Eric D.; 39;Neill, Larry W. | |
2019-05-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:5页码:1227-1244 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A cloud-resolving model coupled to a mixed layer ocean with an initial 500-km-wide, +3-K sea surface temperature (SST) patch is used to demonstrate the relationship between tropical mesoscale SST gradients and convection under different wind speeds. On these scales, boundary layer convergence toward hydrostatic low surface pressure is partially responsible for triggering convection, but convection subsequently organizes into cells and squall lines that propagate away from the patch. For strong wind (12 m s(-1)), enhanced convection is shifted downstream from the patch and consists of relatively small cells that are enhanced from increased moist static energy (MSE) flux over the patch. Convection for weak wind (6 m s(-1)) develops directly over the patch, merging in larger-scale coherent squall-line systems that propagate away from the patch. Squall lines decay after approximately 1 day, and convection redevelops over the patch region after 2 days. Decreasing patch SST from ocean mixing in the coupled simulations affects the overall strength of the convection, but does not qualitatively alter the convective behavior in comparison with cases with a fixed 3-K SST anomaly. In all cases, increased fluxes of heat and moisture, along with latent heating from shallow convection, initially generate lower pressure over the patch and convergence of the boundary layer winds. Within about 1 day, secondary convective circulations, such as surface cold pools, act to spread the effects of the convection over the model domain and overwhelm the effect of low pressure. SST anomalies (1 and 0.5 K) generate enhanced convection only for winds below 6 m s(-1). |
英文关键词 | Atmosphere-ocean interaction Convective storms systems Convective-scale processes Deep convection Mesoscale processes |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000466358900002 |
WOS关键词 | SEA-SURFACE TEMPERATURE ; LARGE-EDDY SIMULATION ; SIGNIFICANT TOPOGRAPHY ; ISLAND CONVECTION ; DIURNAL CYCLE ; PART II ; WINDS ; CONVERGENCE ; GRADIENTS ; RAINFALL |
WOS类目 | Meteorology & Atmospheric Sciences |
WOS研究方向 | Meteorology & Atmospheric Sciences |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/183017 |
专题 | 地球科学 |
作者单位 | Oregon State Univ, Coll Earth Ocean & Atmospher Sci, Corvallis, OR 97331 USA |
推荐引用方式 GB/T 7714 | Skyllingstad, Eric D.,39;Neill, Larry W.. Modeling the Transient Response of Tropical Convection to Mesoscale SST Variations[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(5):1227-1244. |
APA | Skyllingstad, Eric D.,&39;Neill, Larry W..(2019).Modeling the Transient Response of Tropical Convection to Mesoscale SST Variations.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(5),1227-1244. |
MLA | Skyllingstad, Eric D.,et al."Modeling the Transient Response of Tropical Convection to Mesoscale SST Variations".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.5(2019):1227-1244. |
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