Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species
Recent field campaigns have measured enhanced levels of NOx (NO+NO2) and HOx precursors (i.e., H2O2, CH2O, and HONO) that can not be accounted for by gas phase chemistry alone. Snowpack emission is now considered a source of these species. Therefore, the photochemistry in the polar boundary layer is...
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Language: | English |
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Georgia Institute of Technology
2006
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ftgeorgiatech:oai:repository.gatech.edu:1853/14109 2024-06-02T07:58:43+00:00 Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species Sjostedt, Steven Jeffrey Huey, L. Gregory David Tan Wine, Paul H. Robert Whetten Weber, Rodney J. Earth and Atmospheric Sciences 2006-10-10 2891927 bytes application/pdf http://hdl.handle.net/1853/14109 en_US eng Georgia Institute of Technology http://hdl.handle.net/1853/14109 Nitric acid Pernitric acid OH HOx Photochemistry Atmospheric chemistry Text Dissertation 2006 ftgeorgiatech 2024-05-06T11:19:34Z Recent field campaigns have measured enhanced levels of NOx (NO+NO2) and HOx precursors (i.e., H2O2, CH2O, and HONO) that can not be accounted for by gas phase chemistry alone. Snowpack emission is now considered a source of these species. Therefore, the photochemistry in the polar boundary layer is now believed to be much more complex than initially thought. Field campaigns to Summit, Greenland in the summer of 2003 and the spring of 2004 have obtained the first measurements of peroxy (HO2+RO2) and hydroxyl (OH) radicals in the Artic boundary layer. Measurements were collected with a chemical ionization mass spectrometer (CIMS). A highly constrained (ie., O3, H2O, CH4, CO, j-values, NO, H2O2,CH2O, and HONO) 0-D steady-state model was employed in order to test our current understanding of photochemistry. HO2+RO2 measurements were in excellent agreement with model predictions for both spring and summer. OH measurements were in good agreement with spring model predictions but were a factor of two greater than summer model predictions. The role of snowpack emission is also addressed in a HOx budget performed on the spring campaign. Measurements of nitric acid (HNO3) and pernitric acid (HO2NO2) were obtained with the CIMS during the Antarctic Tropospheric Chemistry Investigation (ANTCI). The linkage between HOx and NOx chemistry is examined through partitioning of reactive nitrogen between HNO3 and HO2NO2. The possible impact of reactive nitrogen partitioning on nitrate ions (NO3-) at coring sites is also investigated. Ph.D. Doctoral or Postdoctoral Thesis Antarc* Antarctic Greenland Georgia Institute of Technology: SMARTech - Scholarly Materials and Research at Georgia Tech Antarctic Greenland The Antarctic |
institution |
Open Polar |
collection |
Georgia Institute of Technology: SMARTech - Scholarly Materials and Research at Georgia Tech |
op_collection_id |
ftgeorgiatech |
language |
English |
topic |
Nitric acid Pernitric acid OH HOx Photochemistry Atmospheric chemistry |
spellingShingle |
Nitric acid Pernitric acid OH HOx Photochemistry Atmospheric chemistry Sjostedt, Steven Jeffrey Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species |
topic_facet |
Nitric acid Pernitric acid OH HOx Photochemistry Atmospheric chemistry |
description |
Recent field campaigns have measured enhanced levels of NOx (NO+NO2) and HOx precursors (i.e., H2O2, CH2O, and HONO) that can not be accounted for by gas phase chemistry alone. Snowpack emission is now considered a source of these species. Therefore, the photochemistry in the polar boundary layer is now believed to be much more complex than initially thought. Field campaigns to Summit, Greenland in the summer of 2003 and the spring of 2004 have obtained the first measurements of peroxy (HO2+RO2) and hydroxyl (OH) radicals in the Artic boundary layer. Measurements were collected with a chemical ionization mass spectrometer (CIMS). A highly constrained (ie., O3, H2O, CH4, CO, j-values, NO, H2O2,CH2O, and HONO) 0-D steady-state model was employed in order to test our current understanding of photochemistry. HO2+RO2 measurements were in excellent agreement with model predictions for both spring and summer. OH measurements were in good agreement with spring model predictions but were a factor of two greater than summer model predictions. The role of snowpack emission is also addressed in a HOx budget performed on the spring campaign. Measurements of nitric acid (HNO3) and pernitric acid (HO2NO2) were obtained with the CIMS during the Antarctic Tropospheric Chemistry Investigation (ANTCI). The linkage between HOx and NOx chemistry is examined through partitioning of reactive nitrogen between HNO3 and HO2NO2. The possible impact of reactive nitrogen partitioning on nitrate ions (NO3-) at coring sites is also investigated. Ph.D. |
author2 |
Huey, L. Gregory David Tan Wine, Paul H. Robert Whetten Weber, Rodney J. Earth and Atmospheric Sciences |
format |
Doctoral or Postdoctoral Thesis |
author |
Sjostedt, Steven Jeffrey |
author_facet |
Sjostedt, Steven Jeffrey |
author_sort |
Sjostedt, Steven Jeffrey |
title |
Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species |
title_short |
Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species |
title_full |
Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species |
title_fullStr |
Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species |
title_full_unstemmed |
Investigation of Photochemistry at High Latitudes: Comparison of model predictions to measurements of short lived species |
title_sort |
investigation of photochemistry at high latitudes: comparison of model predictions to measurements of short lived species |
publisher |
Georgia Institute of Technology |
publishDate |
2006 |
url |
http://hdl.handle.net/1853/14109 |
geographic |
Antarctic Greenland The Antarctic |
geographic_facet |
Antarctic Greenland The Antarctic |
genre |
Antarc* Antarctic Greenland |
genre_facet |
Antarc* Antarctic Greenland |
op_relation |
http://hdl.handle.net/1853/14109 |
_version_ |
1800742217690644480 |