3-D microphysical model studies of Arctic denitrification: comparison with observations
Simulations of Arctic denitrification using a 3-D chemistry-microphysics transport model are compared with observations for the winters 1994/95, 1996/97 and 1999/2000. The model of Denitrification by Lagrangian Particle Sedimentation (DLAPSE) couples the full chemical scheme of the 3-D chemical tran...
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ftdoajarticles:oai:doaj.org/article:c5d741ac4e1e422f9393deb9ab37c7db 2023-05-15T15:01:53+02:00 3-D microphysical model studies of Arctic denitrification: comparison with observations S. Davies G. W. Mann K. S. Carslaw M. P. Chipperfield J. A. Kettleborough M. L. Santee H. Oelhaf G. Wetzel Y. Sasano T. Sugita 2005-01-01T00:00:00Z https://doaj.org/article/c5d741ac4e1e422f9393deb9ab37c7db EN eng Copernicus Publications http://www.atmos-chem-phys.net/5/3093/2005/acp-5-3093-2005.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/c5d741ac4e1e422f9393deb9ab37c7db Atmospheric Chemistry and Physics, Vol 5, Iss 11, Pp 3093-3109 (2005) Physics QC1-999 Chemistry QD1-999 article 2005 ftdoajarticles 2022-12-31T00:36:41Z Simulations of Arctic denitrification using a 3-D chemistry-microphysics transport model are compared with observations for the winters 1994/95, 1996/97 and 1999/2000. The model of Denitrification by Lagrangian Particle Sedimentation (DLAPSE) couples the full chemical scheme of the 3-D chemical transport model, SLIMCAT, with a nitric acid trihydrate (NAT) growth and sedimentation scheme. We use observations from the Microwave Limb Sounder (MLS) and Improved Limb Atmospheric Sounder (ILAS) satellite instruments, the balloon-borne Michelsen Interferometer for Passive Atmospheric Sounding (MIPAS-B), and the in situ NO y instrument on-board the ER-2. As well as directly comparing model results with observations, we also assess the extent to which these observations are able to validate the modelling approach taken. For instance, in 1999/2000 the model captures the temporal development of denitrification observed by the ER-2 from late January into March. However, in this winter the vortex was already highly denitrified by late January so the observations do not provide a strong constraint on the modelled rate of denitrification. The model also reproduces the MLS observations of denitrification in early February 2000. In 1996/97 the model captures the timing and magnitude of denitrification as observed by ILAS, although the lack of observations north of ~67° N in the beginning of February make it difficult to constrain the actual timing of onset. The comparison for this winter does not support previous conclusions that denitrification must be caused by an ice-mediated process. In 1994/95 the model notably underestimates the magnitude of denitrification observed during a single balloon flight of the MIPAS-B instrument. Agreement between model and MLS HNO 3 at 68 hPa in mid-February 1995 is significantly better. Sensitivity tests show that a 1.5 K overall decrease in vortex temperatures, or a factor 4 increase in assumed NAT nucleation rates, produce the best statistical fit to MLS observations. Both adjustments would ... Article in Journal/Newspaper Arctic Directory of Open Access Journals: DOAJ Articles Arctic Ilas ENVELOPE(40.618,40.618,64.386,64.386) Michelsen ENVELOPE(-45.033,-45.033,-60.733,-60.733) |
institution |
Open Polar |
collection |
Directory of Open Access Journals: DOAJ Articles |
op_collection_id |
ftdoajarticles |
language |
English |
topic |
Physics QC1-999 Chemistry QD1-999 |
spellingShingle |
Physics QC1-999 Chemistry QD1-999 S. Davies G. W. Mann K. S. Carslaw M. P. Chipperfield J. A. Kettleborough M. L. Santee H. Oelhaf G. Wetzel Y. Sasano T. Sugita 3-D microphysical model studies of Arctic denitrification: comparison with observations |
topic_facet |
Physics QC1-999 Chemistry QD1-999 |
description |
Simulations of Arctic denitrification using a 3-D chemistry-microphysics transport model are compared with observations for the winters 1994/95, 1996/97 and 1999/2000. The model of Denitrification by Lagrangian Particle Sedimentation (DLAPSE) couples the full chemical scheme of the 3-D chemical transport model, SLIMCAT, with a nitric acid trihydrate (NAT) growth and sedimentation scheme. We use observations from the Microwave Limb Sounder (MLS) and Improved Limb Atmospheric Sounder (ILAS) satellite instruments, the balloon-borne Michelsen Interferometer for Passive Atmospheric Sounding (MIPAS-B), and the in situ NO y instrument on-board the ER-2. As well as directly comparing model results with observations, we also assess the extent to which these observations are able to validate the modelling approach taken. For instance, in 1999/2000 the model captures the temporal development of denitrification observed by the ER-2 from late January into March. However, in this winter the vortex was already highly denitrified by late January so the observations do not provide a strong constraint on the modelled rate of denitrification. The model also reproduces the MLS observations of denitrification in early February 2000. In 1996/97 the model captures the timing and magnitude of denitrification as observed by ILAS, although the lack of observations north of ~67° N in the beginning of February make it difficult to constrain the actual timing of onset. The comparison for this winter does not support previous conclusions that denitrification must be caused by an ice-mediated process. In 1994/95 the model notably underestimates the magnitude of denitrification observed during a single balloon flight of the MIPAS-B instrument. Agreement between model and MLS HNO 3 at 68 hPa in mid-February 1995 is significantly better. Sensitivity tests show that a 1.5 K overall decrease in vortex temperatures, or a factor 4 increase in assumed NAT nucleation rates, produce the best statistical fit to MLS observations. Both adjustments would ... |
format |
Article in Journal/Newspaper |
author |
S. Davies G. W. Mann K. S. Carslaw M. P. Chipperfield J. A. Kettleborough M. L. Santee H. Oelhaf G. Wetzel Y. Sasano T. Sugita |
author_facet |
S. Davies G. W. Mann K. S. Carslaw M. P. Chipperfield J. A. Kettleborough M. L. Santee H. Oelhaf G. Wetzel Y. Sasano T. Sugita |
author_sort |
S. Davies |
title |
3-D microphysical model studies of Arctic denitrification: comparison with observations |
title_short |
3-D microphysical model studies of Arctic denitrification: comparison with observations |
title_full |
3-D microphysical model studies of Arctic denitrification: comparison with observations |
title_fullStr |
3-D microphysical model studies of Arctic denitrification: comparison with observations |
title_full_unstemmed |
3-D microphysical model studies of Arctic denitrification: comparison with observations |
title_sort |
3-d microphysical model studies of arctic denitrification: comparison with observations |
publisher |
Copernicus Publications |
publishDate |
2005 |
url |
https://doaj.org/article/c5d741ac4e1e422f9393deb9ab37c7db |
long_lat |
ENVELOPE(40.618,40.618,64.386,64.386) ENVELOPE(-45.033,-45.033,-60.733,-60.733) |
geographic |
Arctic Ilas Michelsen |
geographic_facet |
Arctic Ilas Michelsen |
genre |
Arctic |
genre_facet |
Arctic |
op_source |
Atmospheric Chemistry and Physics, Vol 5, Iss 11, Pp 3093-3109 (2005) |
op_relation |
http://www.atmos-chem-phys.net/5/3093/2005/acp-5-3093-2005.pdf https://doaj.org/toc/1680-7316 https://doaj.org/toc/1680-7324 1680-7316 1680-7324 https://doaj.org/article/c5d741ac4e1e422f9393deb9ab37c7db |
_version_ |
1766333890221309952 |