Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99)
Because investigations of PAN at higher southern latitudes are very scarce, we measuredsurface PAN concentrations for the first time in Antarctica. During the PhotochemicalExperiment at Neumayer (PEAN'99) campaign mean surface PAN mixing ratios of(13 ± 7) pptv and maximum values of 48 pptv were...
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ftawi:oai:epic.awi.de:1505 2024-09-15T17:46:32+00:00 Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99) Jacobi, Hans-Werner Weller, Rolf Jones, A. E. Anderson, P. S. Schrems, Otto 2000 application/pdf https://epic.awi.de/id/eprint/1505/ https://epic.awi.de/id/eprint/1505/1/Jac8888a.pdf https://hdl.handle.net/10013/epic.12096 https://hdl.handle.net/10013/epic.12096.d001 unknown https://epic.awi.de/id/eprint/1505/1/Jac8888a.pdf https://hdl.handle.net/10013/epic.12096.d001 Jacobi, H. W. , Weller, R. orcid:0000-0003-4880-5572 , Jones, A. E. , Anderson, P. S. and Schrems, O. (2000) Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99) , Atmospheric Environment, 34 , pp. 5235-5247 . hdl:10013/epic.12096 EPIC3Atmospheric Environment, 34, pp. 5235-5247, ISSN: 1352-2310 Article isiRev 2000 ftawi 2024-06-24T03:53:34Z Because investigations of PAN at higher southern latitudes are very scarce, we measuredsurface PAN concentrations for the first time in Antarctica. During the PhotochemicalExperiment at Neumayer (PEAN'99) campaign mean surface PAN mixing ratios of(13 ± 7) pptv and maximum values of 48 pptv were found. When these PAN mixing ratioswere compared to the sum of NOx and inorganic nitrate they were found to be equal orhigher. Low ambient air temperatures and low PAN concentrations caused a slowhomogeneous PAN decomposition rate of approximately 5 x 10^-2 pptv hr^-1. These slowdecay rates were not sufficient to firmly establish the simultaneously observed NOxconcentrations. In addition, low concentration ratios of [HNO3] / [NOx] imply that thephotochemical production of NOx within the snow pack can influence surface NOx mixingratios in Antarctica. Alternate measurements of PAN mixing ratios at two different heightsabove the snow surface were performed to derive fluxes between the lower troposphereand the underlying snow pack using calculated friction velocities. Most of the concentrationdifferences were below the precision of the measurements. Therefore, only an upper limitfor the PAN flux of ± 1 x 10^13 molecules m^-2 s^-1 without a predominant direction canbe estimated. However, PAN fluxes below this limit can still influence both the transfer ofnitrogen compounds between atmosphere and ice, and the PAN budget in higher southernlatitudes. Article in Journal/Newspaper Antarc* Antarctic Antarctica Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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Alfred Wegener Institute for Polar- and Marine Research (AWI): ePIC (electronic Publication Information Center) |
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ftawi |
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unknown |
description |
Because investigations of PAN at higher southern latitudes are very scarce, we measuredsurface PAN concentrations for the first time in Antarctica. During the PhotochemicalExperiment at Neumayer (PEAN'99) campaign mean surface PAN mixing ratios of(13 ± 7) pptv and maximum values of 48 pptv were found. When these PAN mixing ratioswere compared to the sum of NOx and inorganic nitrate they were found to be equal orhigher. Low ambient air temperatures and low PAN concentrations caused a slowhomogeneous PAN decomposition rate of approximately 5 x 10^-2 pptv hr^-1. These slowdecay rates were not sufficient to firmly establish the simultaneously observed NOxconcentrations. In addition, low concentration ratios of [HNO3] / [NOx] imply that thephotochemical production of NOx within the snow pack can influence surface NOx mixingratios in Antarctica. Alternate measurements of PAN mixing ratios at two different heightsabove the snow surface were performed to derive fluxes between the lower troposphereand the underlying snow pack using calculated friction velocities. Most of the concentrationdifferences were below the precision of the measurements. Therefore, only an upper limitfor the PAN flux of ± 1 x 10^13 molecules m^-2 s^-1 without a predominant direction canbe estimated. However, PAN fluxes below this limit can still influence both the transfer ofnitrogen compounds between atmosphere and ice, and the PAN budget in higher southernlatitudes. |
format |
Article in Journal/Newspaper |
author |
Jacobi, Hans-Werner Weller, Rolf Jones, A. E. Anderson, P. S. Schrems, Otto |
spellingShingle |
Jacobi, Hans-Werner Weller, Rolf Jones, A. E. Anderson, P. S. Schrems, Otto Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99) |
author_facet |
Jacobi, Hans-Werner Weller, Rolf Jones, A. E. Anderson, P. S. Schrems, Otto |
author_sort |
Jacobi, Hans-Werner |
title |
Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99) |
title_short |
Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99) |
title_full |
Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99) |
title_fullStr |
Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99) |
title_full_unstemmed |
Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99) |
title_sort |
peroxyacetyl nitrate (pan) concentrations in the antarctic troposphere measured during the photochemical experiment at neumayer (pean'99) |
publishDate |
2000 |
url |
https://epic.awi.de/id/eprint/1505/ https://epic.awi.de/id/eprint/1505/1/Jac8888a.pdf https://hdl.handle.net/10013/epic.12096 https://hdl.handle.net/10013/epic.12096.d001 |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
EPIC3Atmospheric Environment, 34, pp. 5235-5247, ISSN: 1352-2310 |
op_relation |
https://epic.awi.de/id/eprint/1505/1/Jac8888a.pdf https://hdl.handle.net/10013/epic.12096.d001 Jacobi, H. W. , Weller, R. orcid:0000-0003-4880-5572 , Jones, A. E. , Anderson, P. S. and Schrems, O. (2000) Peroxyacetyl nitrate (PAN) concentrations in the Antarctic troposphere measured during the Photochemical Experiment at Neumayer (PEAN'99) , Atmospheric Environment, 34 , pp. 5235-5247 . hdl:10013/epic.12096 |
_version_ |
1810494756971610112 |