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A 1D RCE Study of Factors Affecting the Tropical Tropopause Layer and Surface Climate

Dacie, Sally and Kluft, Lukas and Schmidt, Hauke and Stevens, Bjorn and Buehler, Stefan A and Nowack, Peer and Dietmüller, Simone and Abraham, N. Luke and Birner, Thomas (2019) A 1D RCE Study of Factors Affecting the Tropical Tropopause Layer and Surface Climate. Journal of Climate, 32, pp. 6769-6782. American Meteorological Society. DOI: 10.1175/JCLI-D-18-0778.1 ISSN 0894-8755

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Official URL: https://journals.ametsoc.org/doi/abs/10.1175/JCLI-D-18-0778.1

Abstract

There are discrepancies between global climate models regarding the evolution of the tropical tropopause layer (TTL) and also whether changes in ozone impact the surface under climate change. We use a 1D clear-sky radiative–convective equilibrium model to determine how a variety of factors can affect the TTL and how they influence surface climate. We develop a new method of convective adjustment, which relaxes the temperature profile toward the moist adiabat and allows for cooling above the level of neutral buoyancy. The TTL temperatures in our model are sensitive to CO2 concentration, ozone profile, the method of convective adjustment, and the upwelling velocity, which is used to calculate a dynamical cooling rate in the stratosphere. Moreover, the temperature response of the TTL to changes in each of the above factors sometimes depends on the others. The surface temperature response to changes in ozone and upwelling at and above the TTL is also strongly amplified by both stratospheric and tropospheric water vapor changes. With all these influencing factors, it is not surprising that global models disagree with regard to TTL structure and evolution and the influence of ozone changes on surface temperatures. On the other hand, the effect of doubling CO2 on the surface, including just radiative, water vapor, and lapse-rate feedbacks, is relatively robust to changes in convection, upwelling, or the applied ozone profile.

Item URL in elib:https://elib.dlr.de/129685/
Document Type:Article
Additional Information:NB: AMS Copyright policy detailed under https://www.ametsoc.org/ams/index.cfm/publications/ethical-guidelines-and-ams-policies/ams-copyright-policy/
Title:A 1D RCE Study of Factors Affecting the Tropical Tropopause Layer and Surface Climate
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Dacie, SallyMPI für Meteorologie, HamburgUNSPECIFIED
Kluft, LukasMPI für Meteorologie, HamburgUNSPECIFIED
Schmidt, HaukeMPI für Meteorologie, HamburgUNSPECIFIED
Stevens, BjornMPI für Meteorologie, HamburgUNSPECIFIED
Buehler, Stefan AUniv. Hamburghttps://orcid.org/0000-0001-6389-1160
Nowack, PeerGrantham Institute, Imperial College, London, UKUNSPECIFIED
Dietmüller, SimoneDLR, IPAUNSPECIFIED
Abraham, N. LukeUniv. of Cambridge, UKUNSPECIFIED
Birner, ThomasUniv. MünchenUNSPECIFIED
Date:19 June 2019
Journal or Publication Title:Journal of Climate
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:32
DOI :10.1175/JCLI-D-18-0778.1
Page Range:pp. 6769-6782
Publisher:American Meteorological Society
ISSN:0894-8755
Status:Published
Keywords:Radiative-convective equilibrium; Tropopause; Climate sensitivity; Ozone; Single column models
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Earth Observation
DLR - Research area:Raumfahrt
DLR - Program:R EO - Erdbeobachtung
DLR - Research theme (Project):R - Vorhaben Atmosphären- und Klimaforschung
Location: Oberpfaffenhofen
Institutes and Institutions:Institute of Atmospheric Physics > Earth System Modelling
Institute of Atmospheric Physics
Deposited By: Dietmüller, Simone
Deposited On:22 Oct 2019 12:35
Last Modified:22 Oct 2019 12:35

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