2026-04-17T01:00:39Zhttps://recercat.cat/oai/requestoai:recercat.cat:10256/208072024-06-18T11:51:28Zcom_2072_452955com_2072_2054col_2072_453063
RECERCAT
author
Jahani, Babak
author
Andersen, Hendrik
author
Calbó Angrill, Josep
author
González Gutiérrez, Josep Abel
author
Cermak, Jan
2024-06-18T11:51:28Z
2024-06-18T11:51:28Z
2022-01-31
http://hdl.handle.net/10256/20807
This study presents an approach for the quantification of cloud–aerosol transition-zone broadband
longwave radiative effects at the top of the atmosphere (TOA) during daytime over the ocean, based on satellite
observations and radiative transfer simulation. Specifically, we used several products from MODIS (MODerate
Resolution Imaging Spectroradiometer) and CERES (Clouds and the Earth’s Radiant Energy System) sensors
for the identification and selection of CERES footprints with a horizontally homogeneous transition-zone and
clear-sky conditions. For the selected transition-zone footprints, radiative effect was calculated as the difference
between the instantaneous CERES TOA upwelling broadband longwave radiance observations and corresponding clear-sky radiance simulations. The clear-sky radiances were simulated using the Santa Barbara DISORT
(DIScrete Ordinates Radiative Transfer program for a multi-Layered plane-parallel medium) Atmospheric Radiative Transfer model fed by the hourly ERA5 reanalysis (fifth generation ECMWF ReAnalysis) atmospheric
and surface data. The CERES radiance observations corresponding to the clear-sky footprints detected were also
used for validating the simulated clear-sky radiances. We tested this approach using the radiative measurements
made by the MODIS and CERES instruments on board the Aqua platform over the southeastern Atlantic Ocean
during August 2010. For the studied period and domain, transition-zone radiative effect (given in flux units) is
on average equal to 8.0 ± 3.7 W m−2
(heating effect; median: 5.4 W m−2
), although cases with radiative effects
as large as 50 W m−2 were foundThis research has been supported by the Ministerio de Ciencia e Innovación (grant no. PID2019-105901RB-I00) and the Generalitat de Catalunya (grant no. 2018FI_B_00830).
Attribution 4.0 International http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess
Radiació -- Mesurament
Radiation -- Measurement
Radiació atmosfèrica
Atmospheric radiation
Longwave radiative effect of the cloud–aerosol transition zone based on CERES observations
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion peer-reviewed