The arctic winter stratosphere: simulated with a 3-D chemistry transport model
During the past two decades, the ozone layer has developed a “hole” each winter and spring above the Antarctic continent. Also in cold Arctic winters substantial stratospheric ozone depletion has been measured, although less than in the Antarctic stratosphere. In the Arctic winter stratosphere, the...
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Online Access: | https://dspace.library.uu.nl/handle/1874/1106 |
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ftunivutrecht:oai:dspace.library.uu.nl:1874/1106 2023-07-23T04:15:42+02:00 The arctic winter stratosphere: simulated with a 3-D chemistry transport model Broek, Martina Maria Petronella van den Lelieveld, Jos Bregman, Bram 2004-10-04 image/pdf https://dspace.library.uu.nl/handle/1874/1106 en eng Utrecht University https://dspace.library.uu.nl/handle/1874/1106 info:eu-repo/semantics/OpenAccess Natuur- en Sterrenkunde meteorologie atmosfeerchemie ozon ozonlaag stratosfeer polar stratospheric cloud (PSC) chlooractivatie polaire vortex chemie transport model (CTM) nitric acid trihydrate (NAT) Dissertation 2004 ftunivutrecht 2023-07-01T22:46:18Z During the past two decades, the ozone layer has developed a “hole” each winter and spring above the Antarctic continent. Also in cold Arctic winters substantial stratospheric ozone depletion has been measured, although less than in the Antarctic stratosphere. In the Arctic winter stratosphere, the amount of ozone depletion varies interannually and within one winter, depending on polar vortex stability and temperature. The simulation of transport and chemical conversion of ozone and related species requires a three-dimensional (3D) chemistry transport model (CTM), because of the non-symmetric behaviour of the Arctic polar vortex. This thesis reports on several studies of the Arctic winter stratosphere carried out with such a CTM, using off-line meteorological fields. In Chapter II, chlorine activation and ozone depletion in the Arctic winter stratosphere of 1996-1997 are modelled with the newly developed stratospheric version of our CTM. Comparisons have been made with total O3 columns and ClO concentrations observed by satellites, and with ozone loss rates derived from observations during February and March 1997. ClO concentrations and ozone depletion are somewhat underestimated by the model. Key model parameters have been varied to explain this underestimation. Next to temperature, the formation mechanism of solid and/or liquid PSC particles constitutes the main model uncertainty. The representation of tracer transport is a third uncertain parameter, influencing both ozone and inorganic chlorine. In Chapter III, we have used the CTM with different horizontal resolutions to evaluate this stratospheric transport by simulating the long-lived tracers HF and CH4 during the Arctic winter of 1999/2000. Outside the vortex the model results agree well with the observations, but inside, the model underestimates the observed vertical gradient in HF and CH4. Too strong mixing through the vortex edge could be a cause for these model discrepancies, e.g. associated with the calculated mass fluxes. As later studies point out, ... Doctoral or Postdoctoral Thesis Antarc* Antarctic Arctic Utrecht University Repository Antarctic Arctic The Antarctic |
institution |
Open Polar |
collection |
Utrecht University Repository |
op_collection_id |
ftunivutrecht |
language |
English |
topic |
Natuur- en Sterrenkunde meteorologie atmosfeerchemie ozon ozonlaag stratosfeer polar stratospheric cloud (PSC) chlooractivatie polaire vortex chemie transport model (CTM) nitric acid trihydrate (NAT) |
spellingShingle |
Natuur- en Sterrenkunde meteorologie atmosfeerchemie ozon ozonlaag stratosfeer polar stratospheric cloud (PSC) chlooractivatie polaire vortex chemie transport model (CTM) nitric acid trihydrate (NAT) Broek, Martina Maria Petronella van den The arctic winter stratosphere: simulated with a 3-D chemistry transport model |
topic_facet |
Natuur- en Sterrenkunde meteorologie atmosfeerchemie ozon ozonlaag stratosfeer polar stratospheric cloud (PSC) chlooractivatie polaire vortex chemie transport model (CTM) nitric acid trihydrate (NAT) |
description |
During the past two decades, the ozone layer has developed a “hole” each winter and spring above the Antarctic continent. Also in cold Arctic winters substantial stratospheric ozone depletion has been measured, although less than in the Antarctic stratosphere. In the Arctic winter stratosphere, the amount of ozone depletion varies interannually and within one winter, depending on polar vortex stability and temperature. The simulation of transport and chemical conversion of ozone and related species requires a three-dimensional (3D) chemistry transport model (CTM), because of the non-symmetric behaviour of the Arctic polar vortex. This thesis reports on several studies of the Arctic winter stratosphere carried out with such a CTM, using off-line meteorological fields. In Chapter II, chlorine activation and ozone depletion in the Arctic winter stratosphere of 1996-1997 are modelled with the newly developed stratospheric version of our CTM. Comparisons have been made with total O3 columns and ClO concentrations observed by satellites, and with ozone loss rates derived from observations during February and March 1997. ClO concentrations and ozone depletion are somewhat underestimated by the model. Key model parameters have been varied to explain this underestimation. Next to temperature, the formation mechanism of solid and/or liquid PSC particles constitutes the main model uncertainty. The representation of tracer transport is a third uncertain parameter, influencing both ozone and inorganic chlorine. In Chapter III, we have used the CTM with different horizontal resolutions to evaluate this stratospheric transport by simulating the long-lived tracers HF and CH4 during the Arctic winter of 1999/2000. Outside the vortex the model results agree well with the observations, but inside, the model underestimates the observed vertical gradient in HF and CH4. Too strong mixing through the vortex edge could be a cause for these model discrepancies, e.g. associated with the calculated mass fluxes. As later studies point out, ... |
author2 |
Lelieveld, Jos Bregman, Bram |
format |
Doctoral or Postdoctoral Thesis |
author |
Broek, Martina Maria Petronella van den |
author_facet |
Broek, Martina Maria Petronella van den |
author_sort |
Broek, Martina Maria Petronella van den |
title |
The arctic winter stratosphere: simulated with a 3-D chemistry transport model |
title_short |
The arctic winter stratosphere: simulated with a 3-D chemistry transport model |
title_full |
The arctic winter stratosphere: simulated with a 3-D chemistry transport model |
title_fullStr |
The arctic winter stratosphere: simulated with a 3-D chemistry transport model |
title_full_unstemmed |
The arctic winter stratosphere: simulated with a 3-D chemistry transport model |
title_sort |
arctic winter stratosphere: simulated with a 3-d chemistry transport model |
publisher |
Utrecht University |
publishDate |
2004 |
url |
https://dspace.library.uu.nl/handle/1874/1106 |
geographic |
Antarctic Arctic The Antarctic |
geographic_facet |
Antarctic Arctic The Antarctic |
genre |
Antarc* Antarctic Arctic |
genre_facet |
Antarc* Antarctic Arctic |
op_relation |
https://dspace.library.uu.nl/handle/1874/1106 |
op_rights |
info:eu-repo/semantics/OpenAccess |
_version_ |
1772176647961706496 |