Deutsch
 
Hilfe Datenschutzhinweis Impressum
  DetailsucheBrowse

Datensatz

DATENSATZ AKTIONENEXPORT
Zur Ablage hinzufügen
 Lokale TagsFreigabegeschichteDetailsÜbersicht
  Ocean-atmosphere interactions on decadal timescales

Venzke, S. (1999). Ocean-atmosphere interactions on decadal timescales. PhD Thesis, University of Hamburg, Hamburg.

Item is

 

einblenden: alle ausblenden: alle

Basisdaten

einblenden: ausblenden:
Datensatz-Permalink: https://hdl.handle.net/21.11116/0000-0005-D571-B Versions-Permalink: https://hdl.handle.net/21.11116/0000-0005-D572-A
Genre: Hochschulschrift

Dateien

einblenden: Dateien
ausblenden: Dateien
:
63_examensarbeit.pdf (Verlagsversion), 7MB
Öffnen   Speichern
Datei-Permalink:
https://hdl.handle.net/21.11116/0000-0005-D573-9
Name:
63_examensarbeit.pdf
Beschreibung:
Retrodigitalisat
OA-Status:
Sichtbarkeit:
Öffentlich
MIME-Typ / Prüfsumme:
application/pdf / [MD5]
Technische Metadaten:
Öffnen
Copyright Datum:
-
Copyright Info:
The author
Lizenz:
-

Externe Referenzen

einblenden:

Urheber

einblenden:
ausblenden:
 Urheber:
Venzke, Stephan1, Autor
Affiliations:
1MPI for Meteorology, Max Planck Society, Bundesstraße 53, 20146 Hamburg, DE, ou_913545              

Inhalt

einblenden:
ausblenden:
Schlagwörter: -
 Zusammenfassung: In this thesis, different processes that might contribute to the generation of decadal
climate variability were investigated using general circulation models (GCMs) of
the atmosphere and the ocean. First, the sensitivity of the atmospheric circulation
to decadal changes in the underlying sea surface temperatures (SSTs) was esti-
mated from an ensemble of six integrations of the Hadley Centre atmospheric GCM
HadAMl, all forced by observed SSTs and sea-ice extents for the period 1949-93.
Using a novel approach to estimate the 'true' SST-forced atmospheric response in
the presence of spatially correlated internal atmospheric variability, the decadal at-
mospheric variability was studied over the North Atlantic and North Pacific regions.
After filtering out the atmospheric circulation changes associated with the El Niño -
Southern Oscillation (ENSO) phenomenon, the dominant mode of forced variability
over the North Atlantic exhibits a meridional dipole in the mean sea level pressure
(MSLP) field and is related to a tripole in the anomalous North Atlantic SSTs. Over
large parts of the North Atlantic region, however, the atmospheric response is not
consistent enough to provide feedbacks to the underlying ocean that could cause
self-sustained decadal oscillations. Over the North Pacific the atmospheric response
is dominated by ENSO. In addition to the ENSO-related response an independent
decadal atmospheric signal was detected. It consistently involves iarge-scaie wind
stress curl anomalies over the North Pacific region. The effect of such wind stress
curl anomalies on the ocean was studied in the second part of this thesis using the
Hamburg Ocean Primitive Equation model (HOPE). It is shown how the adjust-
ment of the North Pacific gyre circulation to large-scale wind stress curl anomalies
determines the decadal timescale and how it may be exploited for predictions of
decadal upper-ocean temperature changes in the central North Pacific. The HOPE
model was also used to investigate a mechanism for the generation of decadal cli-
mate variability in the tropical Pacific which relies on subduction of midlatitudinal
North Pacific SST anomalies and their equatorward propagation within the oceanic
thermocline. It is demonstrated that such a mechanism is unlikely to cause decadal
climate variability in the tropical Pacific.

Details

einblenden:
ausblenden:
Sprache(n): eng - English
 Datum: 1999-01-071999
 Publikationsstatus: Erschienen
 Seiten: 99
 Ort, Verlag, Ausgabe: Hamburg : University of Hamburg
 Inhaltsverzeichnis: -
 Art der Begutachtung: -
 Identifikatoren: -
 Art des Abschluß: Doktorarbeit

Veranstaltung

einblenden:

Entscheidung

einblenden:

Projektinformation

einblenden:

Quelle 1

einblenden:
ausblenden:
Titel: Examensarbeit / Max-Planck-Institut für Meteorologie
Genre der Quelle: Reihe
 Urheber:
Affiliations:
Ort, Verlag, Ausgabe: Hamburg : MPI für Meteorologie
Seiten: - Band / Heft: 63 Artikelnummer: - Start- / Endseite: - Identifikator: ISSN: 0938-5177