The Role of Ocean-Atmosphere Interaction over the Gulf Stream SST-front in North Atlantic Sector Climate
This work deals with various aspects of the atmospheric response to mid-latitude SST fronts, in particular in the Gulf Stream region. It consists of three parts: In the first part the effect of enhanced model resolution on the correct representation of the processes in the frontal region is discusse...
Main Author: | |
---|---|
Other Authors: | , |
Format: | Doctoral or Postdoctoral Thesis |
Language: | English |
Published: |
2015
|
Subjects: | |
Online Access: | https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-165046 https://macau.uni-kiel.de/receive/diss_mods_00016504 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00005962/dissertation_hand.pdf |
id |
ftunivkiel:oai:macau.uni-kiel.de:diss_mods_00016504 |
---|---|
record_format |
openpolar |
spelling |
ftunivkiel:oai:macau.uni-kiel.de:diss_mods_00016504 2024-06-23T07:54:58+00:00 The Role of Ocean-Atmosphere Interaction over the Gulf Stream SST-front in North Atlantic Sector Climate Hand, Ralf Keenlyside, Noel S. Greatbatch, Richard J. 2015 https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-165046 https://macau.uni-kiel.de/receive/diss_mods_00016504 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00005962/dissertation_hand.pdf eng eng https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-165046 https://macau.uni-kiel.de/receive/diss_mods_00016504 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00005962/dissertation_hand.pdf https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess thesis ddc:550 climate variability climate modelling ocean-atmosphere interaction SST fronts North Atlantic Klimavariabilität Klimamodellierung Ozean-Atmosphären Wechselwirkungen SST-Fronten Nordatlantik dissertation Text doc-type:PhDThesis 2015 ftunivkiel 2024-06-12T14:20:04Z This work deals with various aspects of the atmospheric response to mid-latitude SST fronts, in particular in the Gulf Stream region. It consists of three parts: In the first part the effect of enhanced model resolution on the correct representation of the processes in the frontal region is discussed, based on analysis of a set of experiments using the atmospheric general circulation model ECHAM5. Precipitation shows sensitivity to resolution, but most other quantities that we analysed do not. Therefore, this sensitivity is likely caused by the parameterisation of atmospheric convection. In winter, also the representation of the North Atlantic storm track seems to benefit from higher model resolution. The second part focuses on the question of whether or not SST variability in the Gulf Stream region in general has an influence on the atmospheric processes related to the SST front. A transient ECHAM5 ensemble run, shows that convective precipitation has a high sensitivity to atmospheric boundary conditions in the region of the SST front and that local SSTs and convective precipitation are highly correlated there. In summer the so-called pressure adjustment mechanism, which has been identified in the climatological mean state, is enhanced when warm SST anomalies occur. In winter the enhanced precipitation is likely related to atmospheric fronts. Their frequency is not enhanced significantly, but the amount of precipitation per front is effected. The last part of this work deals with ocean-atmosphere interactions in a warming climate, based on a long-term integration with the Earth System Model MPI-ESM. The objective was to assess to what extend SST changes in the North Atlantic contribute to the global warming signal in the atmosphere, locally as well as on larger spatial scales. For the region of the historical Gulf Stream SST-front - a region were the historical run shows a local maximum in precipitation - the model projection shows a decrease in winter-time precipitation that is connected to a weakening of the ... Doctoral or Postdoctoral Thesis North Atlantic MACAU: Open Access Repository of Kiel University |
institution |
Open Polar |
collection |
MACAU: Open Access Repository of Kiel University |
op_collection_id |
ftunivkiel |
language |
English |
topic |
thesis ddc:550 climate variability climate modelling ocean-atmosphere interaction SST fronts North Atlantic Klimavariabilität Klimamodellierung Ozean-Atmosphären Wechselwirkungen SST-Fronten Nordatlantik |
spellingShingle |
thesis ddc:550 climate variability climate modelling ocean-atmosphere interaction SST fronts North Atlantic Klimavariabilität Klimamodellierung Ozean-Atmosphären Wechselwirkungen SST-Fronten Nordatlantik Hand, Ralf The Role of Ocean-Atmosphere Interaction over the Gulf Stream SST-front in North Atlantic Sector Climate |
topic_facet |
thesis ddc:550 climate variability climate modelling ocean-atmosphere interaction SST fronts North Atlantic Klimavariabilität Klimamodellierung Ozean-Atmosphären Wechselwirkungen SST-Fronten Nordatlantik |
description |
This work deals with various aspects of the atmospheric response to mid-latitude SST fronts, in particular in the Gulf Stream region. It consists of three parts: In the first part the effect of enhanced model resolution on the correct representation of the processes in the frontal region is discussed, based on analysis of a set of experiments using the atmospheric general circulation model ECHAM5. Precipitation shows sensitivity to resolution, but most other quantities that we analysed do not. Therefore, this sensitivity is likely caused by the parameterisation of atmospheric convection. In winter, also the representation of the North Atlantic storm track seems to benefit from higher model resolution. The second part focuses on the question of whether or not SST variability in the Gulf Stream region in general has an influence on the atmospheric processes related to the SST front. A transient ECHAM5 ensemble run, shows that convective precipitation has a high sensitivity to atmospheric boundary conditions in the region of the SST front and that local SSTs and convective precipitation are highly correlated there. In summer the so-called pressure adjustment mechanism, which has been identified in the climatological mean state, is enhanced when warm SST anomalies occur. In winter the enhanced precipitation is likely related to atmospheric fronts. Their frequency is not enhanced significantly, but the amount of precipitation per front is effected. The last part of this work deals with ocean-atmosphere interactions in a warming climate, based on a long-term integration with the Earth System Model MPI-ESM. The objective was to assess to what extend SST changes in the North Atlantic contribute to the global warming signal in the atmosphere, locally as well as on larger spatial scales. For the region of the historical Gulf Stream SST-front - a region were the historical run shows a local maximum in precipitation - the model projection shows a decrease in winter-time precipitation that is connected to a weakening of the ... |
author2 |
Keenlyside, Noel S. Greatbatch, Richard J. |
format |
Doctoral or Postdoctoral Thesis |
author |
Hand, Ralf |
author_facet |
Hand, Ralf |
author_sort |
Hand, Ralf |
title |
The Role of Ocean-Atmosphere Interaction over the Gulf Stream SST-front in North Atlantic Sector Climate |
title_short |
The Role of Ocean-Atmosphere Interaction over the Gulf Stream SST-front in North Atlantic Sector Climate |
title_full |
The Role of Ocean-Atmosphere Interaction over the Gulf Stream SST-front in North Atlantic Sector Climate |
title_fullStr |
The Role of Ocean-Atmosphere Interaction over the Gulf Stream SST-front in North Atlantic Sector Climate |
title_full_unstemmed |
The Role of Ocean-Atmosphere Interaction over the Gulf Stream SST-front in North Atlantic Sector Climate |
title_sort |
role of ocean-atmosphere interaction over the gulf stream sst-front in north atlantic sector climate |
publishDate |
2015 |
url |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-165046 https://macau.uni-kiel.de/receive/diss_mods_00016504 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00005962/dissertation_hand.pdf |
genre |
North Atlantic |
genre_facet |
North Atlantic |
op_relation |
https://nbn-resolving.org/urn:nbn:de:gbv:8-diss-165046 https://macau.uni-kiel.de/receive/diss_mods_00016504 https://macau.uni-kiel.de/servlets/MCRFileNodeServlet/dissertation_derivate_00005962/dissertation_hand.pdf |
op_rights |
https://rightsstatements.org/page/InC/1.0/ info:eu-repo/semantics/openAccess |
_version_ |
1802647329106296832 |