Universität zu Köln

Lauer, Melanie, Block, Karoline, Salzmann, Marc ORCID: 0000-0002-3987-2303 and Quaas, Johannes ORCID: 0000-0001-7057-194X (2020). CO2-forced changes of Arctic temperature lapse rates in CMIP5 models. Meteorol. Z., 29 (1). S. 79 - 94. STUTTGART: E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG. ISSN 1610-1227

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Abstract

Global climate models show that the lapse rate feedback is a key reason for Arctic amplificati n of global warming. However, a proper assessment of the underlying spatial and temporal structure of the vertically non-uniform temperature change is still lacking. In this study we use the output from several CMIP5 climate models to investigate the Arctic lapse rate change in the context of global warming forced by CO2. Comparisons between the perturbed and unperturbed states show that in the Arctic the temperature increases more near the surface than aloft, especially over ice-covered ocean and Arctic land. The bottom-heavy warming is most pronounced in boreal winter and is also seen in spring and autumn but to a lesser extent. The atmosphere over these areas is characterised by an inversion layer. We f nd that the inversion strength in the unperturbed climate and the change of the temperature lapse rate from unperturbed to perturbed state correlate to each other across the model ensemble over ice-covered ocean, open ocean and for sea ice retreat regions. However, the models simulate no correlation for the entire Arctic. Further investigation of the surface energy budget for models with weak and strong inversion strengths, respectively, show that the surface energy storage and the increase of turbulent heat f uxes which enhance the downward longwave radiation contribute most to the warming at the surface.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Lauer, Melanie UNSPECIFIED UNSPECIFIED UNSPECIFIED Block, Karoline UNSPECIFIED UNSPECIFIED UNSPECIFIED Salzmann, Marc UNSPECIFIED orcid.org/0000-0002-3987-2303 UNSPECIFIED Quaas, Johannes UNSPECIFIED orcid.org/0000-0001-7057-194X UNSPECIFIED
URN:	urn:nbn:de:hbz:38-351237
DOI:	10.1127/metz/2020/0975
Journal or Publication Title:	Meteorol. Z.
Volume:	29
Number:	1
Page Range:	S. 79 - 94
Date:	2020
Publisher:	E SCHWEIZERBARTSCHE VERLAGSBUCHHANDLUNG
Place of Publication:	STUTTGART
ISSN:	1610-1227
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language SEA-ICE LOSS; POLAR AMPLIFICATION; FEEDBACK PROCESSES; CLIMATE-CHANGE; CO2 CONCENTRATION; SEASONALITY; HEAT Multiple languages Meteorology & Atmospheric Sciences Multiple languages
URI:	http://kups.ub.uni-koeln.de/id/eprint/35123