Airborne Submillimeter Measurements of Arctic Middle Atmospheric Trace Gases: Evidence for Denitrification in the Arctic Polar Stratosphere
Denitrification inside the Arctic vortex in winter 1999/2000 was studied based on measurements of HNO:sub:3:/sub: and N:sub:2:/sub:O by the airborne submillimeter radiometer ASUR for the first time. Vortexwide denitrification was found in mid-March 2000 compared to early-December 1999 shown by a vor...
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Universität Bremen
2003
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ftsubbremen:oai:media.suub.uni-bremen.de:Publications/elib/1956 2023-05-15T14:54:25+02:00 Airborne Submillimeter Measurements of Arctic Middle Atmospheric Trace Gases: Evidence for Denitrification in the Arctic Polar Stratosphere Flugzeuggetragene Submillimeterwellenmessungen von Spurengasen der arktischen mittleren Atmosphäre: Nachweis von Denitrifizierung in der arktischen polaren Stratosphäre Kleinböhl, Armin Künzi, Klaus Notholt, Justus 2003-12-17 application/pdf https://media.suub.uni-bremen.de/handle/elib/1956 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000007652 eng eng Universität Bremen FB1 Physik/Elektrotechnik https://media.suub.uni-bremen.de/handle/elib/1956 urn:nbn:de:gbv:46-diss000007652 info:eu-repo/semantics/openAccess microwave radiometry ASUR nitric acid nitrous oxide denitrification diabatic descent polar ozone mesospheric ozone geo 074 ddc:geo 074 Dissertation doctoralThesis 2003 ftsubbremen 2022-11-09T07:09:42Z Denitrification inside the Arctic vortex in winter 1999/2000 was studied based on measurements of HNO:sub:3:/sub: and N:sub:2:/sub:O by the airborne submillimeter radiometer ASUR for the first time. Vortexwide denitrification was found in mid-March 2000 compared to early-December 1999 shown by a vortex averaged NO:sub:y:/sub: deficit between 1.2±0.9 ppb at ~16 km and 5.3±2.7 ppb at ~20.5 km altitude. A trend of stronger denitrification with increasing equivalent latitude was evident. The observations were compared with runs of the SLIMCAT model applying different denitrification schemes based on ice, large NAT particles in equilibrium, and non-equilibrium NAT particles (DLAPSE). The DLAPSE scheme showed the best agreement with the observed denitrification in winter 1999/2000. Denitrification was also studied in winter 2002/2003. Calculations applying the DLAPSE scheme were able to reproduce the observed HNO:sub:3:/sub: levels north of 75° on 19/1/2003 reasonably well. During the major stratospheric warming in mid-January 2003 unusually high mixing ratios of ozone and N:sub:2:/sub:O were observed by ASUR in the middle stratosphere on 23/1/2003 around 69°N. The observed similarities above a potential temperature of ~800 K with profiles measured around 20°N on 1/3/2003 lead to the conclusion that the airmasses must have been transported from the tropics to the Arctic by rapid isentropic transport in ~3-7 days. To extend the altitude range of ASUR´s measurement capabilities into the mesosphere a high resolution chirp-transform spectrometer has been integrated in the ASUR. A scheme for the retrieval of mesospheric ozone has been developed using measurements from September 2002. Retrievals with total integration times of ~180-720 seconds show reasonable results up to 64-68 km altitude with a total error of ~25%. Measurements of the diurnal variation of mesospheric ozone were in reasonable agreement with the results calculated by a mesospheric chemistry model. Doctoral or Postdoctoral Thesis Arctic Arktis* Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) Arctic |
institution |
Open Polar |
collection |
Media SuUB Bremen (Staats- und Universitätsbibliothek Bremen) |
op_collection_id |
ftsubbremen |
language |
English |
topic |
microwave radiometry ASUR nitric acid nitrous oxide denitrification diabatic descent polar ozone mesospheric ozone geo 074 ddc:geo 074 |
spellingShingle |
microwave radiometry ASUR nitric acid nitrous oxide denitrification diabatic descent polar ozone mesospheric ozone geo 074 ddc:geo 074 Kleinböhl, Armin Airborne Submillimeter Measurements of Arctic Middle Atmospheric Trace Gases: Evidence for Denitrification in the Arctic Polar Stratosphere |
topic_facet |
microwave radiometry ASUR nitric acid nitrous oxide denitrification diabatic descent polar ozone mesospheric ozone geo 074 ddc:geo 074 |
description |
Denitrification inside the Arctic vortex in winter 1999/2000 was studied based on measurements of HNO:sub:3:/sub: and N:sub:2:/sub:O by the airborne submillimeter radiometer ASUR for the first time. Vortexwide denitrification was found in mid-March 2000 compared to early-December 1999 shown by a vortex averaged NO:sub:y:/sub: deficit between 1.2±0.9 ppb at ~16 km and 5.3±2.7 ppb at ~20.5 km altitude. A trend of stronger denitrification with increasing equivalent latitude was evident. The observations were compared with runs of the SLIMCAT model applying different denitrification schemes based on ice, large NAT particles in equilibrium, and non-equilibrium NAT particles (DLAPSE). The DLAPSE scheme showed the best agreement with the observed denitrification in winter 1999/2000. Denitrification was also studied in winter 2002/2003. Calculations applying the DLAPSE scheme were able to reproduce the observed HNO:sub:3:/sub: levels north of 75° on 19/1/2003 reasonably well. During the major stratospheric warming in mid-January 2003 unusually high mixing ratios of ozone and N:sub:2:/sub:O were observed by ASUR in the middle stratosphere on 23/1/2003 around 69°N. The observed similarities above a potential temperature of ~800 K with profiles measured around 20°N on 1/3/2003 lead to the conclusion that the airmasses must have been transported from the tropics to the Arctic by rapid isentropic transport in ~3-7 days. To extend the altitude range of ASUR´s measurement capabilities into the mesosphere a high resolution chirp-transform spectrometer has been integrated in the ASUR. A scheme for the retrieval of mesospheric ozone has been developed using measurements from September 2002. Retrievals with total integration times of ~180-720 seconds show reasonable results up to 64-68 km altitude with a total error of ~25%. Measurements of the diurnal variation of mesospheric ozone were in reasonable agreement with the results calculated by a mesospheric chemistry model. |
author2 |
Künzi, Klaus Notholt, Justus |
format |
Doctoral or Postdoctoral Thesis |
author |
Kleinböhl, Armin |
author_facet |
Kleinböhl, Armin |
author_sort |
Kleinböhl, Armin |
title |
Airborne Submillimeter Measurements of Arctic Middle Atmospheric Trace Gases: Evidence for Denitrification in the Arctic Polar Stratosphere |
title_short |
Airborne Submillimeter Measurements of Arctic Middle Atmospheric Trace Gases: Evidence for Denitrification in the Arctic Polar Stratosphere |
title_full |
Airborne Submillimeter Measurements of Arctic Middle Atmospheric Trace Gases: Evidence for Denitrification in the Arctic Polar Stratosphere |
title_fullStr |
Airborne Submillimeter Measurements of Arctic Middle Atmospheric Trace Gases: Evidence for Denitrification in the Arctic Polar Stratosphere |
title_full_unstemmed |
Airborne Submillimeter Measurements of Arctic Middle Atmospheric Trace Gases: Evidence for Denitrification in the Arctic Polar Stratosphere |
title_sort |
airborne submillimeter measurements of arctic middle atmospheric trace gases: evidence for denitrification in the arctic polar stratosphere |
publisher |
Universität Bremen |
publishDate |
2003 |
url |
https://media.suub.uni-bremen.de/handle/elib/1956 https://nbn-resolving.org/urn:nbn:de:gbv:46-diss000007652 |
geographic |
Arctic |
geographic_facet |
Arctic |
genre |
Arctic Arktis* |
genre_facet |
Arctic Arktis* |
op_relation |
https://media.suub.uni-bremen.de/handle/elib/1956 urn:nbn:de:gbv:46-diss000007652 |
op_rights |
info:eu-repo/semantics/openAccess |
_version_ |
1766326141880107008 |