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Atmospheric blocking in a high resolution climate model: influences of mean state, orography and eddy forcing
Atmospheric science letters, 2013-01, Vol.14 (1), p.34-40
Berckmans, Julie
Woollings, Tim
Demory, Marie‐Estelle
Vidale, Pier‐Luigi
Roberts, Malcolm
2013
Volltextzugriff (PDF)
Details
Autor(en) / Beteiligte
Berckmans, Julie
Woollings, Tim
Demory, Marie‐Estelle
Vidale, Pier‐Luigi
Roberts, Malcolm
Titel
Atmospheric blocking in a high resolution climate model: influences of mean state, orography and eddy forcing
Ist Teil von
Atmospheric science letters, 2013-01, Vol.14 (1), p.34-40
Ort / Verlag
Chichester, UK: John Wiley & Sons, Ltd
Erscheinungsjahr
2013
Quelle
Wiley Online Library - AutoHoldings Journals
Beschreibungen/Notizen
An underestimate of atmospheric blocking occurrence is a well‐known limitation of many climate models. This article presents an analysis of Northern Hemisphere winter blocking in an atmospheric model with increased horizontal resolution. European blocking frequency increases with model resolution, and this results from an improvement in the atmospheric patterns of variability as well as a simple improvement in the mean state. There is some evidence that the transient eddy momentum forcing of European blocks is increased at high resolution, which could account for this. However, it is also shown that the increase in resolution of the orography is needed to realise the improvement in blocking, consistent with the increase in height of the Rocky Mountains acting to increase the tilt of the Atlantic jet stream and giving higher mean geopotential heights over northern Europe. Blocking frequencies in the Pacific sector are also increased with atmospheric resolution, but in this case the improvement in orography actually leads to a decrease in blocking Copyright © 2012 Royal Meteorological Society and British Crown copyright, Met Office.
Sprache
Englisch
Identifikatoren
ISSN: 1530-261X
eISSN: 1530-261X
DOI: 10.1002/asl2.412
Titel-ID: cdi_wageningen_narcis_oai_library_wur_nl_wurpubs_442466
Format
–
Schlagworte
Atmospheric blocking
,
Atmospheric models
,
Atmospheric sciences
,
Climate
,
Climate models
,
Dynamic height
,
eddies
,
flow
,
Geopotential
,
Geopotential height
,
High resolution
,
Jet stream
,
Jet streams (meteorology)
,
mean state
,
Momentum
,
Mountains
,
Northern Hemisphere
,
Orography
,
patterns
,
project
,
propagation
,
Resolution
,
simulations
,
transient eddies
,
Vortices
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