Space-Based Analysis of the Cloud Thermodynamic Phase Transition for Varying Microphysical and Meteorological Regimes - Archive ouverte HAL Access content directly
Journal Articles Geophysical Research Letters Year : 2020

Space-Based Analysis of the Cloud Thermodynamic Phase Transition for Varying Microphysical and Meteorological Regimes

(1) , (1) , ,
1

Abstract

Phase transitions leading to cloud glaciation occur at temperatures that vary between -38°C and 0°C depending on aerosol types and concentrations, the meteorology, and cloud microphysical and macrophysical parameters, although the relationships remain poorly understood. Here, we statistically retrieve a cloud glaciation temperature from two passive space-based instruments that are part of the NASA/CNES A-Train, the POLarization and Directionality of the Earth's Reflectances (POLDER) and the MODerate resolution Imaging Spectroradiometer (MODIS). We compare the glaciation temperature for varying bins of cloud droplet effective radius, latitude, and large-scale vertical pressure velocity and specific humidity at 700 hPa. Cloud droplet size has the strongest influence on glaciation temperature: For cloud droplets larger than 21 μm, the glaciation temperature is 6°C higher than for cloud droplets smaller than 9 μm. Stronger updrafts are also associated with lower glaciation temperatures.
Fichier principal
Vignette du fichier
Geophysical Research Letters - 2020 - Coopman - Space%u2010Based Analysis of the Cloud Thermodynamic Phase Transition for.pdf (972.45 Ko) Télécharger le fichier
Origin : Publisher files allowed on an open archive

Dates and versions

insu-03686303 , version 1 (03-06-2022)

Licence

Attribution - CC BY 4.0

Identifiers

Cite

Q. Coopman, J. Riedi, S. Zeng, T. J. Garrett. Space-Based Analysis of the Cloud Thermodynamic Phase Transition for Varying Microphysical and Meteorological Regimes. Geophysical Research Letters, 2020, 47, ⟨10.1029/2020GL087122⟩. ⟨insu-03686303⟩
14 View
6 Download

Altmetric

Share

Gmail Facebook Twitter LinkedIn More