Global S&T Development Trend Analysis Platform of Resources and Environment
DOI | 10.1029/2019JD031817 |
Exploring Impacts of Size-Dependent Evaporation and Entrainment in a Global Model | |
Karset, I. H. H.1; Gettelman, A.2; Storelvmo, T.1; Alterskjaer, K.3; Berntsen, T. K.1,3 | |
2020-02-27 | |
发表期刊 | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES
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ISSN | 2169-897X |
EISSN | 2169-8996 |
出版年 | 2020 |
卷号 | 125期号:4 |
文章类型 | Article |
语种 | 英语 |
国家 | Norway; USA |
英文摘要 | While most observations indicate well-buffered clouds to aerosol perturbations, global models do not. Among the suggested mechanisms for this discrepancy is the models' lack of connections between cloud droplet size and two processes that can contribute to reduced cloudiness when droplets become more numerous and smaller: evaporation and entrainment. In this study, we explore different implementations of size-dependent evaporation and entrainment in the global atmospheric model CAM5.3-Oslo. We study their impact on the preindustrial-to-present day change in liquid water path (LWPPD-PI) and the corresponding aerosol indirect effect (AIE(PD-PI)). Impacts of the 2014-2015 fissure eruption in Holuhraun, Iceland, are also presented. Our entrainment modifications only have a moderate effect on AIE(PD-PI) (changes from -1.07 W m(-2) to -0.98 W m(-2)), and a small impact on the signal from the Holuhraun eruption compared to other suggested compensating mechanisms. Simulations with added size-dependent evaporation in the top of the stratiform clouds also show small evaporation differences between PI and PD. Moderate changes in AIE(PD-PI) were achieved when also including an entrainment feedback to the evaporation changes, mixing air between the cloudtop layer and the layer above. These changes were not associated with the size dependency, but changes in the cloud susceptibility to aerosols in both PI and PD when adding evaporation. We find that increased evaporation of smaller droplets at stratiform cloud tops can reduce LWP, but can increase LWP in some areas due to enhanced shallow convection caused by destabilization. |
领域 | 气候变化 |
收录类别 | SCI-E |
WOS记录号 | WOS:000519227000007 |
WOS关键词 | COMMUNITY ATMOSPHERE MODEL ; AEROSOL-CLOUD INTERACTIONS ; DROPLET EFFECTIVE RADIUS ; CLIMATE SIMULATIONS ; MICROPHYSICS SCHEME ; TECHNICAL NOTE ; PARAMETERIZATION ; TURBULENCE ; PRECIPITATION ; SENSITIVITY |
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/280069 |
专题 | 气候变化 |
作者单位 | 1.Univ Oslo, Dept Geosci, Sect Meteorol & Oceanog, Oslo, Norway; 2.Natl Ctr Atmospher Res, POB 3000, Boulder, CO 80307 USA; 3.CICERO Ctr Int Climate Res, Oslo, Norway |
推荐引用方式 GB/T 7714 | Karset, I. H. H.,Gettelman, A.,Storelvmo, T.,et al. Exploring Impacts of Size-Dependent Evaporation and Entrainment in a Global Model[J]. JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,2020,125(4). |
APA | Karset, I. H. H.,Gettelman, A.,Storelvmo, T.,Alterskjaer, K.,&Berntsen, T. K..(2020).Exploring Impacts of Size-Dependent Evaporation and Entrainment in a Global Model.JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES,125(4). |
MLA | Karset, I. H. H.,et al."Exploring Impacts of Size-Dependent Evaporation and Entrainment in a Global Model".JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES 125.4(2020). |
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