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(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

bserved and Simulated Variability of Droplet Spectral Dispersion in Convective Clouds Over the Amazo

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Autor(es):
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Pardo, Lianet Hernandez [1, 2] ; Machado, Luiz A. T. [1, 2] ; Morrison, Hugh [3] ; Cecchini, Micael A. [4] ; Andreae, Meinrat O. [5, 2, 6] ; Poehlker, Christopher [2] ; Poeschl, Ulrich [2] ; Rosenfeld, Daniel [7] ; Vendrasco, Eder P. [1] ; Voigt, Christiane [8, 9] ; Wendisch, Manfred [10] ; Poehlker, Mira L. [2]
Número total de Autores: 12
Afiliação do(s) autor(es):
[1] Inst Nacl Pesquisas Espaciais, Ctr Previsao Tempo & Estudos Climat, Cachoeira Paulista - Brazil
[2] Max Planck Inst Chem, Multiphase Chem Dept, Mainz - Germany
[3] Natl Ctr Atmospher Res, Mesoscale & Microscale Meteorol Lab, POB 3000, Boulder, CO 80307 - USA
[4] Univ Sao Paulo, Inst Phys, Sao Paulo - Brazil
[5] Univ Calif San Diego, Scripps Inst Oceanog, La Jolla, CA 92093 - USA
[6] King Saud Univ, Dept Geol & Geophys, Riyadh - Saudi Arabia
[7] Hebrew Univ Jerusalem, Inst Earth Sci, Jerusalem - Israel
[8] Johannes Gutenberg Univ Mainz, Inst Phys Atmosphare, Mainz - Germany
[9] Deutsch Zentrum Luft & Raumfahrt, Inst Phys Atmosphare, Wessling - Germany
[10] Univ Leipzig, Leipziger Inst Meteorol, Leipzig - Germany
Número total de Afiliações: 10
Tipo de documento: Artigo Científico
Fonte: JOURNAL OF GEOPHYSICAL RESEARCH-ATMOSPHERES; v. 126, n. 20 OCT 27 2021.
Citações Web of Science: 2
Resumo

In this study, the variability of the spectral dispersion of droplet size distributions (DSDs) in convective clouds is investigated. Analyses are based on aircraft measurements of growing cumuli near the Amazon basin, and on numerical simulations of an idealized ice-free cumulus. In cleaner clouds, the relative dispersion epsilon, defined as the ratio of the standard deviation to the mean value of the droplet diameter, is negatively correlated with the ratio of the cloud water content (q(c)) to the adiabatic liquid water content (q(a)), while no strong correlation between epsilon and q(c)/q(a) is seen in polluted clouds. Bin microphysics numerical simulations suggest that these contrasting behaviors are associated with the effect of collision-coalescence in cleaner clouds, and secondary droplet activation in polluted clouds, in addition to the turbulent mixing of parcels that experienced different paths within the cloud. Collision-coalescence simultaneously broadens the DSDs and decreases q(c), explaining the inverse relationship between epsilon and q(c)/q(a) in cleaner clouds. Secondary droplet activation broadens the DSDs but has little direct impact on q(c). The combination of a rather modest DSD broadening due to weak collision-coalescence with enhanced droplet activation in both diluted and highly undiluted cloud regions may contribute to maintain a relatively uniform epsilon within polluted clouds. These findings can be useful for parameterizing the shape parameter (mu) of gamma DSDs in bulk microphysics cloud-resolving models. It is shown that emulating the observed mu-q(c)/q(a) relationship improves the estimation of the collision-coalescence rate in bulk microphysics simulations compared to the bin simulations. (AU)

Processo FAPESP: 16/24562-6 - Combinando observações e modelagem numérica para melhorar a descrição dos processos microfísicos das tempestades
Beneficiário:Lianet Hernández Pardo
Linha de fomento: Bolsas no Brasil - Doutorado
Processo FAPESP: 20/13273-9 - Anatomia de nuvens convectivas sobre a Amazônia (ACCA)
Beneficiário:Micael Amore Cecchini
Linha de fomento: Bolsas no Brasil - Pós-Doutorado
Processo FAPESP: 19/06988-4 - Análise das causas do alargamento das DSDs em simulações LES com parametrizações de microfísica bin.
Beneficiário:Lianet Hernández Pardo
Linha de fomento: Bolsas no Exterior - Estágio de Pesquisa - Doutorado