Universität zu Köln

Knudsen, Erlend M. and Walsh, John E. (2016). Northern Hemisphere storminess in the Norwegian Earth System Model (NorESM1-M). Geosci. Model Dev., 9 (7). S. 2335 - 2356. GOTTINGEN: COPERNICUS GESELLSCHAFT MBH. ISSN 1991-9603

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Abstract

Metrics of storm activity in Northern Hemisphere high and midlatitudes are evaluated from historical output and future projections by the Norwegian Earth System Model (NorESM1-M) coupled global climate model. The European Re-Analysis Interim (ERA-Interim) and the Community Climate System Model (CCSM4), a global climate model of the same vintage as NorESM1-M, provide benchmarks for comparison. The focus is on the autumn and early winter (September through December) - the period when the ongoing and projected Arctic sea ice retreat is the greatest. Storm tracks derived from a vorticity-based algorithm for storm identification are reproduced well by NorESM1-M, although the tracks are somewhat better resolved in the higher-resolution ERA-Interim and CCSM4. The tracks show indications of shifting polewards in the future as climate changes under the Representative Concentration Pathway (RCP) forcing scenarios. Cyclones are projected to become generally more intense in the high latitudes, especially over the Alaskan region, although in some other areas the intensity is projected to decrease. While projected changes in track density are less coherent, there is a general tendency towards less frequent storms in midlatitudes and more frequent storms in high latitudes, especially the Baffin Bay/Davis Strait region in September. Autumn precipitation is projected to increase significantly across the entire high latitudes. Together with the projected loss of sea ice and increases in storm intensity and sea level, this increase in precipitation implies a greater vulnerability to coastal flooding and erosion, especially in the Alaskan region. The projected changes in storm intensity and precipitation (as well as sea ice and sea level pressure) scale generally linearly with the RCP value of the forcing and with time through the 21st century.

Item Type:	Journal Article
Creators:	Creators Email ORCID ORCID Put Code Knudsen, Erlend M. UNSPECIFIED UNSPECIFIED UNSPECIFIED Walsh, John E. UNSPECIFIED UNSPECIFIED UNSPECIFIED
URN:	urn:nbn:de:hbz:38-289577
DOI:	10.5194/gmd-9-2335-2016
Journal or Publication Title:	Geosci. Model Dev.
Volume:	9
Number:	7
Page Range:	S. 2335 - 2356
Date:	2016
Publisher:	COPERNICUS GESELLSCHAFT MBH
Place of Publication:	GOTTINGEN
ISSN:	1991-9603
Language:	English
Faculty:	Unspecified
Divisions:	Unspecified
Subjects:	no entry
Uncontrolled Keywords:	Keywords Language ARCTIC SEA-ICE; ATMOSPHERIC CIRCULATION; CYCLONE ACTIVITY; FEATURE TRACKING; CLIMATE MODEL; POLAR LOWS; CMIP5; VARIABILITY; AMPLIFICATION; REANALYSIS Multiple languages Geosciences, Multidisciplinary Multiple languages
Refereed:	Yes
URI:	http://kups.ub.uni-koeln.de/id/eprint/28957