| Full text | |
| Author(s): |
Zhang, Kai
[1]
;
Fu, Rong
[1, 2]
;
Shaikh, Muhammad J.
[1]
;
Ghan, Steven
[3]
;
Wang, Minghuai
[4, 5, 6]
;
Leung, L. Ruby
[3]
;
Dickinson, Robert E.
[1]
;
Marengo, Jose
[7]
Total Authors: 8
|
| Affiliation: | [1] Univ Texas Austin, Jackson Sch Geosci, Austin, TX 78712 - USA
[2] Univ Calif Los Angeles, Dept Atmospher & Ocean Sci, Los Angeles, CA - USA
[3] Pacific Northwest Natl Lab, Richland, WA 99352 - USA
[4] Nanjing Univ, Inst Climate & Global Change Res, Nanjing, Jiangsu - Peoples R China
[5] Nanjing Univ, Sch Atmospher Sci, Nanjing, Jiangsu - Peoples R China
[6] Collaborat Innovat Ctr Climate Change, Nanjing, Jiangsu - Peoples R China
[7] Ctr Nacl Monitoramento & Alertas Desastres Nat, Sao Jose Dos Campos - Brazil
Total Affiliations: 7
|
| Document type: | Journal article |
| Source: | JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES; v. 122, n. 18, p. 9879-9902, SEP 27 2017. |
| Web of Science Citations: | 4 |
| Abstract | |
We evaluate the Community Atmosphere Model Version 5 (CAM5) with a higher-order turbulence closure scheme, named Cloud Layers Unified By Binomials (CLUBB), and a Multiscale Modeling Framework, referred to as the ``superparameterization{''} (SP) with two different microphysics configurations to investigate their influences on rainfall simulations over southern Amazonia. The two different microphysics configurations in SP are the one-moment cloud microphysics without aerosol treatment (SP1) and two-moment cloud microphysics coupled with aerosol treatment (SP2). Results show that both SP2 and CLUBB effectively reduce the low biases of rainfall, mainly during the wet season, and reduce low biases of humidity in the lower troposphere with further reduced shallow clouds and increased surface solar flux. These changes increase moist static energy in the lower atmosphere and contribute to stronger convection and more rainfall. SP2 appears to realistically capture the observed increase of relative humidity prior to deep convection, and it significantly increases rainfall in the afternoon; CLUBB significantly delays the afternoon peak rainfall and produces more precipitation in the early morning, due to more gradual transition between shallow and deep convection. In CAM5 and CAM5 with CLUBB, occurrence of more deep convection appears to be a result of stronger heating rather than higher relative humidity. (AU) | |
| FAPESP's process: | 13/50538-7 - Understanding the causes of the biases that determine the onset of the rainy season in Amazonia in climate models using GoAmazon-CHUVA measurements |
| Grantee: | Jose Antonio Marengo Orsini |
| Support Opportunities: | Regular Research Grants |