Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy
We report the first spectroscopic measurements of volcanic gas emissions by lunar occultation. The experiment was carried out at Masaya volcano, Nicaragua in 1998 using a portable Fourier transform infrared spectrometer. Both SO2 and HCl column concentrations were determined to yield a SO2/HCl molar...
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ftumanchesterpub:oai:pure.atira.dk:publications/05408520-9a20-482d-820f-4b61113944a5 2024-09-30T14:41:35+00:00 Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy Burton, M R Oppenheimer, C Horrocks, L A Francis, P W 2001 https://research.manchester.ac.uk/en/publications/05408520-9a20-482d-820f-4b61113944a5 https://doi.org/Doi 10.1029/2000gl008499 http://onlinelibrary.wiley.com/store/10.1029/2000GL008499/asset/grl13593.pdf?v=1&t=idq1xxn9&s=a5e8349f64429d93b741d11cffa7f9a92c9a87a1 eng eng https://research.manchester.ac.uk/en/publications/05408520-9a20-482d-820f-4b61113944a5 info:eu-repo/semantics/closedAccess Burton , M R , Oppenheimer , C , Horrocks , L A & Francis , P W 2001 , ' Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy ' , Geophysical Research Letters , vol. 28 , no. 5 , pp. 843-846 . https://doi.org/Doi 10.1029/2000gl008499 infrared-spectroscopy remote measurements ftir-spectroscopy masaya-volcano light-source polar night gas temperature nicaragua moon article 2001 ftumanchesterpub https://doi.org/10.1029/2000gl008499 2024-09-02T08:17:27Z We report the first spectroscopic measurements of volcanic gas emissions by lunar occultation. The experiment was carried out at Masaya volcano, Nicaragua in 1998 using a portable Fourier transform infrared spectrometer. Both SO2 and HCl column concentrations were determined to yield a SO2/HCl molar ratio of 2.2 +/- 0.28 (+/-1 sigma). This is significantly greater than the equivalent ratio of 1.6 +/- 0.02 (+/-1 sigma) derived from solar occultation measurements of the volcanic plume. We propose that the cause of the nocturnal increase in SO2/HCl ratio is dissolution of HCl into volcanic water droplets within the plume. This arises because the low saturated vapour pressure of water by night results in strong condensation of plume water vapour whereas by day only negligible plume water vapour condenses. Article in Journal/Newspaper polar night The University of Manchester: Research Explorer Geophysical Research Letters 28 5 843 846 |
institution |
Open Polar |
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The University of Manchester: Research Explorer |
op_collection_id |
ftumanchesterpub |
language |
English |
topic |
infrared-spectroscopy remote measurements ftir-spectroscopy masaya-volcano light-source polar night gas temperature nicaragua moon |
spellingShingle |
infrared-spectroscopy remote measurements ftir-spectroscopy masaya-volcano light-source polar night gas temperature nicaragua moon Burton, M R Oppenheimer, C Horrocks, L A Francis, P W Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy |
topic_facet |
infrared-spectroscopy remote measurements ftir-spectroscopy masaya-volcano light-source polar night gas temperature nicaragua moon |
description |
We report the first spectroscopic measurements of volcanic gas emissions by lunar occultation. The experiment was carried out at Masaya volcano, Nicaragua in 1998 using a portable Fourier transform infrared spectrometer. Both SO2 and HCl column concentrations were determined to yield a SO2/HCl molar ratio of 2.2 +/- 0.28 (+/-1 sigma). This is significantly greater than the equivalent ratio of 1.6 +/- 0.02 (+/-1 sigma) derived from solar occultation measurements of the volcanic plume. We propose that the cause of the nocturnal increase in SO2/HCl ratio is dissolution of HCl into volcanic water droplets within the plume. This arises because the low saturated vapour pressure of water by night results in strong condensation of plume water vapour whereas by day only negligible plume water vapour condenses. |
format |
Article in Journal/Newspaper |
author |
Burton, M R Oppenheimer, C Horrocks, L A Francis, P W |
author_facet |
Burton, M R Oppenheimer, C Horrocks, L A Francis, P W |
author_sort |
Burton, M R |
title |
Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy |
title_short |
Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy |
title_full |
Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy |
title_fullStr |
Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy |
title_full_unstemmed |
Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy |
title_sort |
diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy |
publishDate |
2001 |
url |
https://research.manchester.ac.uk/en/publications/05408520-9a20-482d-820f-4b61113944a5 https://doi.org/Doi 10.1029/2000gl008499 http://onlinelibrary.wiley.com/store/10.1029/2000GL008499/asset/grl13593.pdf?v=1&t=idq1xxn9&s=a5e8349f64429d93b741d11cffa7f9a92c9a87a1 |
genre |
polar night |
genre_facet |
polar night |
op_source |
Burton , M R , Oppenheimer , C , Horrocks , L A & Francis , P W 2001 , ' Diurnal changes in volcanic plume chemistry observed by lunar and solar occultation spectroscopy ' , Geophysical Research Letters , vol. 28 , no. 5 , pp. 843-846 . https://doi.org/Doi 10.1029/2000gl008499 |
op_relation |
https://research.manchester.ac.uk/en/publications/05408520-9a20-482d-820f-4b61113944a5 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1029/2000gl008499 |
container_title |
Geophysical Research Letters |
container_volume |
28 |
container_issue |
5 |
container_start_page |
843 |
op_container_end_page |
846 |
_version_ |
1811644064411418624 |