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Radiative energy balance of Venus: An approach to parameterize thermal cooling and solar heating rates

Haus, Rainer and Kappel, David and Arnold, Gabriele (2017) Radiative energy balance of Venus: An approach to parameterize thermal cooling and solar heating rates. Icarus, 284, pp. 216-232. Elsevier. DOI: 10.1016/j.icarus.2016.11.025 ISSN 0019-1035

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Official URL: http://dx.doi.org/10.1016/j.icarus.2016.11.025

Abstract

Thermal cooling rates QC and solar heating rates QH in the atmosphere of Venus at altitudes between 0 and 100 km are investigated using the radiative transfer and radiative balance simulation techniques described by Haus et al. (2015b, 2016). QC strongly responds to temperature profile and cloud parameter changes, while QH is less sensitive to these parameters. The latter mainly depends on solar insolation conditions and the unknown UV absorber distribution. A parameterization approach is developed that permits a fast and reliable calculation of temperature change rates Q for different atmospheric model parameters and that can be applied in General Circulation Models to investigate atmospheric dynamics. A separation of temperature, cloud parameter, and unknown UV absorber influences is performed. The temperature response parameterization relies on a specific altitude and latitude-dependent cloud model. It is based on an algorithm that characterizes Q responses to a broad range of temperature perturbations at each level of the atmosphere using the Venus International Reference Atmosphere (VIRA) as basis temperature model. The cloud response parameterization considers different temperature conditions and a range of individual cloud mode factors that additionally change cloud optical depths as determined by the initial latitude-dependent model. A QH response parameterization for abundance changes of the unknown UV absorber is also included. Deviations between accurate calculation and parameterization results are in the order of a few tenths of K/day at altitudes below 90 km. The parameterization approach is used to investigate atmospheric radiative equilibrium (RE) conditions. Polar mesospheric RE temperatures above the cloud top are up to 70 K lower and equatorial temperatures up to 10 K higher than observed values. This radiative forcing field is balanced by dynamical processes that maintain the observed thermal structure.

Item URL in elib:https://elib.dlr.de/109285/
Document Type:Article
Title:Radiative energy balance of Venus: An approach to parameterize thermal cooling and solar heating rates
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Haus, RainerWestfälische Wilhelms-Universität MünsterUNSPECIFIED
Kappel, DavidDavid.Kappel (at) dlr.deUNSPECIFIED
Arnold, GabrieleGabriele.Arnold (at) dlr.deUNSPECIFIED
Date:1 March 2017
Journal or Publication Title:Icarus
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:284
DOI :10.1016/j.icarus.2016.11.025
Page Range:pp. 216-232
Publisher:Elsevier
ISSN:0019-1035
Status:Published
Keywords:Venus; Atmospheres, structure; Radiative transfer; Infrared observations
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research
Institute of Planetary Research > Leitungsbereich PF
Deposited By: Kappel, David
Deposited On:15 Dec 2016 08:57
Last Modified:06 Sep 2019 15:26

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