HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island
International audience A new empirical method for the derivation of average HO radical concentrations is presented. The method is based on estimation of CO lifetime through the relative variability of CO and Rn measurements, and hydrocarbon measurements are used to independently determine the relati...
Published in: | Journal of Geophysical Research: Atmospheres |
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Online Access: | https://hal.archives-ouvertes.fr/hal-03117188 https://hal.archives-ouvertes.fr/hal-03117188/document https://hal.archives-ouvertes.fr/hal-03117188/file/2001JD900116.pdf https://doi.org/10.1029/2001JD900116 |
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ftunivnantes:oai:HAL:hal-03117188v1 2023-05-15T13:22:26+02:00 HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island Williams, J. Gros, V. Bonsang, B. Kazan, V. Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Chimie Atmosphérique Expérimentale (CAE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) ICOS-RAMCES (ICOS-RAMCES) 2001-06-27 https://hal.archives-ouvertes.fr/hal-03117188 https://hal.archives-ouvertes.fr/hal-03117188/document https://hal.archives-ouvertes.fr/hal-03117188/file/2001JD900116.pdf https://doi.org/10.1029/2001JD900116 en eng HAL CCSD American Geophysical Union info:eu-repo/semantics/altIdentifier/doi/10.1029/2001JD900116 hal-03117188 https://hal.archives-ouvertes.fr/hal-03117188 https://hal.archives-ouvertes.fr/hal-03117188/document https://hal.archives-ouvertes.fr/hal-03117188/file/2001JD900116.pdf doi:10.1029/2001JD900116 info:eu-repo/semantics/OpenAccess ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.archives-ouvertes.fr/hal-03117188 Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2001, 106 (D12), pp.12719-12725. ⟨10.1029/2001JD900116⟩ [SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment info:eu-repo/semantics/article Journal articles 2001 ftunivnantes https://doi.org/10.1029/2001JD900116 2022-10-11T23:26:01Z International audience A new empirical method for the derivation of average HO radical concentrations is presented. The method is based on estimation of CO lifetime through the relative variability of CO and Rn measurements, and hydrocarbon measurements are used to independently determine the relative effects of chemistry and dynamics. Data from Amsterdam Island (37øS, 77øE), a remote site in the southern Indian Ocean, are used to calculate annual and daily HO levels for 1997 and 1998. A seasonal variation in calculated daily HO, consistent with seasonally changing photolysis rates, with maxima in summer and minima in winter is also derived which is comparable but slightly lower than the most recent zonal mean HO estimates of Spivakovs&v et al. [2000]. The calculated annual HO shows a decrease from 2.7 x 10 • molecule cm-'3 in 1997 to 0.8 x l0 s molecule cm-3 in 1998, possibly as a result of E1 Nifio related meteorological changes. The empirically calculated HO correlates with temperature and relative humidity measured at the island but anticorrelates strongly with CO and to a lesser extent with O3. The limitations and improvements to this method are discussed. The method has potential for long-term monitoring of HO changes over areas upwind from remote sites. 1. Article in Journal/Newspaper Amsterdam Island Université de Nantes: HAL-UNIV-NANTES Indian Journal of Geophysical Research: Atmospheres 106 D12 12719 12725 |
institution |
Open Polar |
collection |
Université de Nantes: HAL-UNIV-NANTES |
op_collection_id |
ftunivnantes |
language |
English |
topic |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
spellingShingle |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment Williams, J. Gros, V. Bonsang, B. Kazan, V. HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island |
topic_facet |
[SDU.OCEAN]Sciences of the Universe [physics]/Ocean Atmosphere [SDU.ENVI]Sciences of the Universe [physics]/Continental interfaces environment |
description |
International audience A new empirical method for the derivation of average HO radical concentrations is presented. The method is based on estimation of CO lifetime through the relative variability of CO and Rn measurements, and hydrocarbon measurements are used to independently determine the relative effects of chemistry and dynamics. Data from Amsterdam Island (37øS, 77øE), a remote site in the southern Indian Ocean, are used to calculate annual and daily HO levels for 1997 and 1998. A seasonal variation in calculated daily HO, consistent with seasonally changing photolysis rates, with maxima in summer and minima in winter is also derived which is comparable but slightly lower than the most recent zonal mean HO estimates of Spivakovs&v et al. [2000]. The calculated annual HO shows a decrease from 2.7 x 10 • molecule cm-'3 in 1997 to 0.8 x l0 s molecule cm-3 in 1998, possibly as a result of E1 Nifio related meteorological changes. The empirically calculated HO correlates with temperature and relative humidity measured at the island but anticorrelates strongly with CO and to a lesser extent with O3. The limitations and improvements to this method are discussed. The method has potential for long-term monitoring of HO changes over areas upwind from remote sites. 1. |
author2 |
Laboratoire des Sciences du Climat et de l'Environnement Gif-sur-Yvette (LSCE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) Chimie Atmosphérique Expérimentale (CAE) Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)-Université de Versailles Saint-Quentin-en-Yvelines (UVSQ)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut national des sciences de l'Univers (INSU - CNRS)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS) ICOS-RAMCES (ICOS-RAMCES) |
format |
Article in Journal/Newspaper |
author |
Williams, J. Gros, V. Bonsang, B. Kazan, V. |
author_facet |
Williams, J. Gros, V. Bonsang, B. Kazan, V. |
author_sort |
Williams, J. |
title |
HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island |
title_short |
HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island |
title_full |
HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island |
title_fullStr |
HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island |
title_full_unstemmed |
HO cycle in 1997 and 1998 over the southern Indian Ocean derived from CO, radon, and hydrocarbon measurements made at Amsterdam Island |
title_sort |
ho cycle in 1997 and 1998 over the southern indian ocean derived from co, radon, and hydrocarbon measurements made at amsterdam island |
publisher |
HAL CCSD |
publishDate |
2001 |
url |
https://hal.archives-ouvertes.fr/hal-03117188 https://hal.archives-ouvertes.fr/hal-03117188/document https://hal.archives-ouvertes.fr/hal-03117188/file/2001JD900116.pdf https://doi.org/10.1029/2001JD900116 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Amsterdam Island |
genre_facet |
Amsterdam Island |
op_source |
ISSN: 2169-897X EISSN: 2169-8996 Journal of Geophysical Research: Atmospheres https://hal.archives-ouvertes.fr/hal-03117188 Journal of Geophysical Research: Atmospheres, American Geophysical Union, 2001, 106 (D12), pp.12719-12725. ⟨10.1029/2001JD900116⟩ |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.1029/2001JD900116 hal-03117188 https://hal.archives-ouvertes.fr/hal-03117188 https://hal.archives-ouvertes.fr/hal-03117188/document https://hal.archives-ouvertes.fr/hal-03117188/file/2001JD900116.pdf doi:10.1029/2001JD900116 |
op_rights |
info:eu-repo/semantics/OpenAccess |
op_doi |
https://doi.org/10.1029/2001JD900116 |
container_title |
Journal of Geophysical Research: Atmospheres |
container_volume |
106 |
container_issue |
D12 |
container_start_page |
12719 |
op_container_end_page |
12725 |
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1766364932003069952 |