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The role of precipitation in aerosol-induced changes in northern hemisphere wintertime stationary waves
SMHI, Forskningsavdelningen, Meteorologi.ORCID-id: 0000-0003-0524-6440
2013 (Engelska)Ingår i: Climate Dynamics, ISSN 0930-7575, E-ISSN 1432-0894, Vol. 41, nr 3-4, s. 647-661Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

The coupled climate model EC-Earth2 is used to investigate the impact of direct radiative effects of aerosols on stationary waves in the northern hemisphere wintertime circulation. The direct effect of aerosols is simulated by introducing prescribed mixing ratios of different aerosol compounds representing pre-industrial and present-day conditions, no indirect effects are included. In the EC-Earth2 results, the surface temperature response is uncorrelated with the highly asymmetric aerosol radiative forcing pattern. Instead, the anomalous extratropical temperature field bears a strong resemblance to the aerosol-induced changes in the stationary-wave pattern. It is demonstrated that the main features of the wave pattern of EC-Earth2 can be replicated by a linear, baroclinic model forced with latent heat changes corresponding to the anomalous convective precipitation generated by EC-Earth2. The tropical latent heat release is an effective means of generating stationary wave trains that propagate into the extratropics. Hence, the results of the present study indicate that aerosol-induced convective precipitation anomalies govern the extratropical wave-field changes, and that the far-field temperature response dominates over local effects of aerosol radiative forcing.

Ort, förlag, år, upplaga, sidor
2013. Vol. 41, nr 3-4, s. 647-661
Nyckelord [en]
Aerosol, Stationary waves, Convective precipitation, EC-Earth
Nationell ämneskategori
Meteorologi och atmosfärforskning
Forskningsämne
Meteorologi
Identifikatorer
URN: urn:nbn:se:smhi:diva-357DOI: 10.1007/s00382-012-1622-7ISI: 000322619500007OAI: oai:DiVA.org:smhi-357DiVA, id: diva2:802025
Tillgänglig från: 2015-04-10 Skapad: 2015-03-31 Senast uppdaterad: 2017-12-04Bibliografiskt granskad

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