On the Arctic Boundary Layer : From Turbulence to Climate
The boundary layer is the part of the atmosphere that is in direct contact with the ground via turbulent motion. At mid-latitudes the boundary layer is usually one or a few kilometers deep, while in the Arctic it is much more shallow, typically a few hundred meters or less. The reason is that here t...
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ftstockholmuniv:oai:DiVA.org:su-6585 2023-05-15T14:49:18+02:00 On the Arctic Boundary Layer : From Turbulence to Climate Mauritsen, Thorsten 2007 application/pdf http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6585 eng eng Stockholms universitet, Meteorologiska institutionen (MISU) Stockholm : Meteorologiska institutionen (MISU) http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6585 urn:isbn:91-7155-373-8 info:eu-repo/semantics/openAccess Atmospheric boundary layers Turbulence Stable stratification Gravity waves Mesoscale motion Arctic climate Meteorology Meteorologi Doctoral thesis, comprehensive summary info:eu-repo/semantics/doctoralThesis text 2007 ftstockholmuniv 2023-02-23T21:38:36Z The boundary layer is the part of the atmosphere that is in direct contact with the ground via turbulent motion. At mid-latitudes the boundary layer is usually one or a few kilometers deep, while in the Arctic it is much more shallow, typically a few hundred meters or less. The reason is that here the absolute temperature increases in the lowest kilometer, making the boundary layer semi-permanently stably stratified. The exchange of heat, momentum and tracers between the atmosphere, ocean and ground under stable stratification is discussed from an observational, modeling and climate-change point of view. A compilation of six observational datasets, ordered by the Richardson number (rather than the widely used Monin-Obukhov length) reveals new information about turbulence in the very stably stratified regime. An essentially new turbulence closure model, based on the total turbulent energy concept and these observational datasets, is developed and tested against large-eddy simulations with promising results. The role of mesoscale motion in the exchange between the atmosphere and surface is investigated both for observations and in idealized model simulations. Finally, it is found that the stably stratified boundary layer is more sensitive to external surface forcing than its neutral and convective counterparts. It is speculated that this could be part of the explanation for the observed Arctic amplification of climate change. Doctoral or Postdoctoral Thesis Arctic Climate change Stockholm University: Publications (DiVA) Arctic |
institution |
Open Polar |
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Stockholm University: Publications (DiVA) |
op_collection_id |
ftstockholmuniv |
language |
English |
topic |
Atmospheric boundary layers Turbulence Stable stratification Gravity waves Mesoscale motion Arctic climate Meteorology Meteorologi |
spellingShingle |
Atmospheric boundary layers Turbulence Stable stratification Gravity waves Mesoscale motion Arctic climate Meteorology Meteorologi Mauritsen, Thorsten On the Arctic Boundary Layer : From Turbulence to Climate |
topic_facet |
Atmospheric boundary layers Turbulence Stable stratification Gravity waves Mesoscale motion Arctic climate Meteorology Meteorologi |
description |
The boundary layer is the part of the atmosphere that is in direct contact with the ground via turbulent motion. At mid-latitudes the boundary layer is usually one or a few kilometers deep, while in the Arctic it is much more shallow, typically a few hundred meters or less. The reason is that here the absolute temperature increases in the lowest kilometer, making the boundary layer semi-permanently stably stratified. The exchange of heat, momentum and tracers between the atmosphere, ocean and ground under stable stratification is discussed from an observational, modeling and climate-change point of view. A compilation of six observational datasets, ordered by the Richardson number (rather than the widely used Monin-Obukhov length) reveals new information about turbulence in the very stably stratified regime. An essentially new turbulence closure model, based on the total turbulent energy concept and these observational datasets, is developed and tested against large-eddy simulations with promising results. The role of mesoscale motion in the exchange between the atmosphere and surface is investigated both for observations and in idealized model simulations. Finally, it is found that the stably stratified boundary layer is more sensitive to external surface forcing than its neutral and convective counterparts. It is speculated that this could be part of the explanation for the observed Arctic amplification of climate change. |
format |
Doctoral or Postdoctoral Thesis |
author |
Mauritsen, Thorsten |
author_facet |
Mauritsen, Thorsten |
author_sort |
Mauritsen, Thorsten |
title |
On the Arctic Boundary Layer : From Turbulence to Climate |
title_short |
On the Arctic Boundary Layer : From Turbulence to Climate |
title_full |
On the Arctic Boundary Layer : From Turbulence to Climate |
title_fullStr |
On the Arctic Boundary Layer : From Turbulence to Climate |
title_full_unstemmed |
On the Arctic Boundary Layer : From Turbulence to Climate |
title_sort |
on the arctic boundary layer : from turbulence to climate |
publisher |
Stockholms universitet, Meteorologiska institutionen (MISU) |
publishDate |
2007 |
url |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6585 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Climate change |
genre_facet |
Arctic Climate change |
op_relation |
http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6585 urn:isbn:91-7155-373-8 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766320348782919680 |