Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1175/JAS-D-18-0346.1 |
Boundary Layer Quasi-Equilibrium Limits Convective Intensity Enhancement from the Diurnal Cycle in Surface Heating | |
Hansen, Zachary R.1,2; Back, Larissa E.1; Zhou, Peigen1 | |
2020 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES
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ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2020 |
卷号 | 77期号:1页码:217-237 |
文章类型 | Article |
语种 | 英语 |
国家 | USA; Peoples R China |
英文摘要 | A combination of cloud-permitting model (CPM) simulations, satellite, and reanalysis data are used to test whether the diurnal cycle in surface temperature has a significant impact on the intensity of deep convection as measured by high-percentile updraft velocities, lightning, and CAPE. The land-ocean contrast in lightning activity shows that convective intensity varies between land and ocean independently from convective quantity. Thus, a mechanism that explains the land-ocean contrast must be able to do so even after controlling for precipitation variations. Motivated by the land-ocean contrast, we use idealized CPM simulations to test the impact of the diurnal cycle on high-percentile updrafts. In simulations, updrafts are somewhat enhanced due to large-scale precipitation enhancement by the diurnal cycle. To control for large-scale precipitation, we use statistical sampling techniques. After controlling for precipitation enhancement, the diurnal cycle does not affect convective intensities. To explain why sampled updrafts are not enhanced, we note that CAPE is also not increased, likely due to boundary layer quasi equilibrium (BLQE) occurring over our land area. Analysis of BLQE in terms of net positive and negative mass flux finds that boundary layer entrainment, and even more importantly downdrafts, account for most of the moist static energy (MSE) sink that is balancing surface fluxes. Using ERA-Interim data, we also find qualitative evidence for BLQE over land in the real world, as high percentiles of CAPE are not greater over land than over ocean. |
英文关键词 | CAPE Convective storms Heat budgets fluxes Statistical techniques Cloud resolving models |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000502851700004 |
WOS关键词 | RADAR REFLECTIVITY ; DEEP CONVECTION ; MODEL ; PRECIPITATION ; VELOCITY ; PARAMETERIZATION ; VARIABILITY ; AEROSOLS ; CONTRAST ; UPDRAFT |
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/280256 |
专题 | 地球科学 |
作者单位 | 1.Univ Wisconsin, Madison, WI USA; 2.Nanjing Univ, Sch Atmospher Sci, Nanjing, Jiangsu, Peoples R China |
推荐引用方式 GB/T 7714 | Hansen, Zachary R.,Back, Larissa E.,Zhou, Peigen. Boundary Layer Quasi-Equilibrium Limits Convective Intensity Enhancement from the Diurnal Cycle in Surface Heating[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2020,77(1):217-237. |
APA | Hansen, Zachary R.,Back, Larissa E.,&Zhou, Peigen.(2020).Boundary Layer Quasi-Equilibrium Limits Convective Intensity Enhancement from the Diurnal Cycle in Surface Heating.JOURNAL OF THE ATMOSPHERIC SCIENCES,77(1),217-237. |
MLA | Hansen, Zachary R.,et al."Boundary Layer Quasi-Equilibrium Limits Convective Intensity Enhancement from the Diurnal Cycle in Surface Heating".JOURNAL OF THE ATMOSPHERIC SCIENCES 77.1(2020):217-237. |
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