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Dynamically forced increase of tropical upwelling in the lower stratosphere

Garny, Hella und Dameris, Martin und Randel, William und Bodeker, Greg und Deckert, Rudolf (2011) Dynamically forced increase of tropical upwelling in the lower stratosphere. Journal of the Atmospheric Sciences, 68, Seiten 1214-1233. DOI: 10.1175/2011JAS3701.1. ISSN 0022-4928.

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Offizielle URL: http://journals.ametsoc.org/doi/abs/10.1175/2011JAS3701.1


Drivers of upwelling in the tropical lower stratosphere are investigated using the E39C-A chemistry– climate model. The climatological annual cycle in upwelling and its wave forcing are compared to the interim ECMWF Re-Analysis (ERA-Interim). The strength in tropical upwelling and its annual cycle can be largely explained by local resolved wave forcing. The climatological mean forcing is due to both stationary planetaryscale waves that originate in the tropics and extratropical transient synoptic-scale waves that are refracted equatorward. Increases in atmospheric greenhouse gas (GHG) concentrations to 2050 force a year-round positive trend in tropical upwelling, which maximizes in the lowermost stratosphere. Tropical ascent is balanced by downwelling between 208 and 408. Strengthening of tropical upwelling can be explained by stronger local forcing by resolved wave flux convergence, which is driven in turn by processes initiated by increases in tropical sea surface temperatures (SSTs). Higher tropical SSTs cause a strengthening of the subtropical jets and modification of deep convection affecting latent heat release. While the former can modify wave propagation and dissipation, the latter affects tropical wave generation. The dominant mechanism leading to enhanced vertical wave propagation into the lower stratosphere is an upward shift of the easterly shear zone due to the strengthening and upward shift of the subtropical jets.

Titel:Dynamically forced increase of tropical upwelling in the lower stratosphere
AutorenInstitution oder E-Mail-Adresse der Autoren
Garny, HellaDLR, IPA
Dameris, MartinDLR, IPA
Randel, WilliamNCAR Boulder, CO, USA
Bodeker, GregBodeker Scientific, Alexandra, NZ
Deckert, RudolfDLR, IPA
Erschienen in:Journal of the Atmospheric Sciences
Referierte Publikation:Ja
In ISI Web of Science:Ja
DOI :10.1175/2011JAS3701.1
Seitenbereich:Seiten 1214-1233
Stichwörter:Brewer-Dobson circulation, numerical modelling, chemistry-climate model
HGF - Forschungsbereich:Luftfahrt, Raumfahrt und Verkehr
HGF - Programm:Raumfahrt
HGF - Programmthema:Erdbeobachtung
DLR - Schwerpunkt:Raumfahrt
DLR - Forschungsgebiet:R EO - Erdbeobachtung
DLR - Teilgebiet (Projekt, Vorhaben):R - Vorhaben Atmosphären- und Klimaforschung
Standort: Oberpfaffenhofen
Institute & Einrichtungen:Institut für Physik der Atmosphäre > Dynamik der Atmosphäre
Hinterlegt von: Prof. Dr. rer. nat. Martin Dameris
Hinterlegt am:18 Nov 2011 15:38
Letzte Änderung:09 Jul 2015 12:07

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