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DOI | 10.1175/JAS-D-18-0351.1 |
Probing the Response of Tropical Deep Convection to Aerosol Perturbations Using Idealized Cloud-Resolving Simulations with Parameterized Large-Scale Dynamics | |
Anber, Usama M.1; Wang, Shuguang2; Gentine, Pierre3; Jensen, Michael P.1 | |
2019-09-01 | |
发表期刊 | JOURNAL OF THE ATMOSPHERIC SCIENCES |
ISSN | 0022-4928 |
EISSN | 1520-0469 |
出版年 | 2019 |
卷号 | 76期号:9页码:2885-2897 |
文章类型 | Article |
语种 | 英语 |
国家 | USA |
英文摘要 | A framework is introduced to investigate the indirect effect of aerosol loading on tropical deep convection using three-dimensional limited-domain idealized cloud-system-resolving model simulations coupled with large-scale dynamics over fixed sea surface temperature. The large-scale circulation is parameterized using the spectral weak temperature gradient (WTG) approximation that utilizes the dominant balance between adiabatic cooling and diabatic heating in the tropics. The aerosol loading effect is examined by varying the number of cloud condensation nuclei (CCN) available to form cloud droplets in the two-moment bulk microphysics scheme over a wide range of environments from 30 to 5000 cm(-3). The radiative heating is held at a constant prescribed rate in order to isolate the microphysical effects. Analyses are performed over the period after equilibrium is achieved between convection and the large-scale environment. Mean precipitation is found to decrease modestly and monotonically when the aerosol number concentration increases as convection gets weaker, despite the increase in cloud liquid water in the warm-rain region and ice crystals aloft. This reduction is traced down to the reduction in surface enthalpy fluxes as an energy source to the atmospheric column induced by the coupling of the large-scale motion, though the gross moist stability remains constant. Increasing CCN concentration leads to 1) a cooler free troposphere because of a reduction in the diabatic heating and 2) a warmer boundary layer because of suppressed evaporative cooling. This dipole temperature structure is associated with anomalously descending large-scale vertical motion above the boundary layer and ascending motion at lower levels. Sensitivity tests suggest that changes in convection and mean precipitation are unlikely to be caused by the impact of aerosols on cloud droplets and microphysical properties but rather by accounting for the feedback from convective adjustment with the large-scale dynamics. Furthermore, a simple scaling argument is derived based on the vertically integrated moist static energy budget, which enables estimation of changes in precipitation given known changes in surfaces enthalpy fluxes and the constant gross moist stability. The impact on cloud hydrometeors and microphysical properties is also examined, and it is consistent with the macrophysical picture. |
英文关键词 | Deep convection Convective-scale processes |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000484501400001 |
WOS关键词 | ATMOSPHERIC CONVECTION ; PART II ; MICROPHYSICS PARAMETERIZATION ; VERTICAL DIFFUSION ; MODEL SIMULATIONS ; PRECIPITATION ; TEMPERATURE ; LAYER ; CONDENSATION ; EQUILIBRIUM |
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/186803 |
专题 | 地球科学 |
作者单位 | 1.Brookhaven Natl Lab, Environm & Climate Sci Dept, Upton, NY 11973 USA; 2.Columbia Univ, Dept Appl Phys & Appl Math, New York, NY USA; 3.Columbia Univ, Dept Earth & Environm Engn, New York, NY USA |
推荐引用方式 GB/T 7714 | Anber, Usama M.,Wang, Shuguang,Gentine, Pierre,et al. Probing the Response of Tropical Deep Convection to Aerosol Perturbations Using Idealized Cloud-Resolving Simulations with Parameterized Large-Scale Dynamics[J]. JOURNAL OF THE ATMOSPHERIC SCIENCES,2019,76(9):2885-2897. |
APA | Anber, Usama M.,Wang, Shuguang,Gentine, Pierre,&Jensen, Michael P..(2019).Probing the Response of Tropical Deep Convection to Aerosol Perturbations Using Idealized Cloud-Resolving Simulations with Parameterized Large-Scale Dynamics.JOURNAL OF THE ATMOSPHERIC SCIENCES,76(9),2885-2897. |
MLA | Anber, Usama M.,et al."Probing the Response of Tropical Deep Convection to Aerosol Perturbations Using Idealized Cloud-Resolving Simulations with Parameterized Large-Scale Dynamics".JOURNAL OF THE ATMOSPHERIC SCIENCES 76.9(2019):2885-2897. |
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