Influence of the Subcloud Layer on the Development of a Deep Convective Ensemble

被引:123
作者
Boing, Steven J. [1 ]
Jonker, Harm J. J. [1 ]
Siebesma, A. Pier [1 ,2 ]
Grabowski, Wojciech W. [3 ]
机构
[1] Delft Univ Technol, Delft, Netherlands
[2] Royal Netherlands Meteorol Inst KNMI, De Bilt, Netherlands
[3] Natl Ctr Atmospher Res, Boulder, CO 80307 USA
关键词
HIGH-RESOLUTION SIMULATION; VERTICAL WIND SHEARS; DIURNAL CYCLE; TROPICAL CONVECTION; SHALLOW CUMULUS; PART I; CLOUD; INITIATION; MODEL; ORGANIZATION;
D O I
10.1175/JAS-D-11-0317.1
中图分类号
P4 [大气科学(气象学)];
学科分类号
0706 ; 070601 ;
摘要
The rapid transition from shallow to deep convection is investigated using large-eddy simulations. The role of cold pools, which occur due to the evaporation of rainfall, is explored using a series of experiments in which their formation is suppressed. A positive feedback occurs: the presence of cold pools promotes deeper, wider, and more buoyant clouds with higher precipitation rates, which in turn lead to stronger cold pools. To assess the influence of the subcloud layer on the development of deep convection, the coupling between the cloud layer and the subcloud layer is explored using Lagrangian particle trajectories. As shown in previous studies, particles that enter clouds have properties that deviate significantly from the mean state. However, the differences between particles that enter shallow and deep clouds are remarkably small in the subcloud layer, and become larger in the cloud layer, indicating different entrainment rates. The particles that enter the deepest clouds also correspond to the widest cloud bases, which points to the importance of convective organization within the subcloud layer.
引用
收藏
页码:2682 / 2698
页数:17
相关论文
共 73 条
[1]  
Bechtold P., 2006, Q J ROY METEOR SOC, V130, P3119
[2]   Evaluation of the diurnal cycle of precipitation, surface thermodynamics, and surface fluxes in the ECMWF model using LBA data [J].
Betts, AK ;
Jakob, C .
JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES, 2002, 107 (D20) :LBA12-1
[3]  
Bryan GH, 2004, MON WEATHER REV, V132, P2421, DOI 10.1175/1520-0493(2004)132<2421:AROIWP>2.0.CO
[4]  
2
[5]  
Bryan GH, 2003, MON WEATHER REV, V131, P2394, DOI 10.1175/1520-0493(2003)131<2394:RRFTSO>2.0.CO
[6]  
2
[7]  
Carbone RE, 2000, MON WEATHER REV, V128, P3459, DOI 10.1175/1520-0493(2000)128<3459:TICITA>2.0.CO
[8]  
2
[9]  
Dawe J., 2011, ATMOS CHEM PHYS DISC, V11, P23231, DOI [10.5194/acpd-11-23231-2011, DOI 10.5194/ACPD-11-23231-2011]
[10]   The Role of Entrainment in the Diurnal Cycle of Continental Convection [J].
Del Genio, Anthony D. ;
Wu, Jingbo .
JOURNAL OF CLIMATE, 2010, 23 (10) :2722-2738