Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship
Atmospheric hydrogen peroxide (H2O2) measurements at Summit, Greenland, in May–June, 1993 exhibited a diel variation, with afternoon highs typically 1–2 parts per billion by volume (ppbv) and nighttime lows about 0.5 ppbv lower. This variation closely followed that for temperature; specific humidity...
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1995
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ftunivbern:oai:boris.unibe.ch:158717 2023-08-20T04:06:54+02:00 Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship Bales, Roger C. McConnell, Joseph R. Losleben, Mark V. Conklin, Martha H. Fuhrer, Katrin Neftel, Albrecht Dibb, Jack F. Kahl, Jonathan D. W. Stearns, Charles R. 1995 application/pdf https://boris.unibe.ch/158717/1/bales95jgr.pdf https://boris.unibe.ch/158717/ eng eng American Geophysical Union https://boris.unibe.ch/158717/ info:eu-repo/semantics/openAccess Bales, Roger C.; McConnell, Joseph R.; Losleben, Mark V.; Conklin, Martha H.; Fuhrer, Katrin; Neftel, Albrecht; Dibb, Jack F.; Kahl, Jonathan D. W.; Stearns, Charles R. (1995). Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship. Journal of Geophysical Research: Atmospheres, 100(D9), pp. 18661-18668. American Geophysical Union 10.1029/95JD01841 <http://dx.doi.org/10.1029/95JD01841> 530 Physics info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion PeerReviewed 1995 ftunivbern https://doi.org/10.1029/95JD01841 2023-07-31T22:08:19Z Atmospheric hydrogen peroxide (H2O2) measurements at Summit, Greenland, in May–June, 1993 exhibited a diel variation, with afternoon highs typically 1–2 parts per billion by volume (ppbv) and nighttime lows about 0.5 ppbv lower. This variation closely followed that for temperature; specific humidity exhibited the same general trend. During a 17-day snowfall-free period, surface snow was accumulating H2O2, apparently from nighttime cocondensation of H2O and H2O2. Previous photochemical modeling (Neftel et al., 1995) suggests that daytime H2O2 should be about 1 ppbv, significantly lower than our measured values. Previous equilibrium partitioning measurements between ice and gas phase (Conklin et al., 1993) suggest that air in equilibrium with H2O2 concentrations measured in surface snow (15–18 μM) should have an H2O2 concentration 2–3 times what we measured 0.2–3.5 m above the snow surface. A simple eddy diffusion model, with vertical eddy diffusion coefficients calculated from balloon soundings, suggested that atmospheric H2O2 concentrations should be affected by any H2O2 degassed from surface snow. However, field measurements showed the absence of either high concentrations of H2O2 or a measurable concentration gradient between inlets 0.2 and 3 m above the snow. A surface resistance to degassing, that is, slow release of H2O2 from the ice matrix, is a plausible explanation for the differences between observations and modeled atmospheric profiles. Degassing of H2O2 at a rate below our detection limit would still influence measured atmospheric concentrations and help explain the difference between measurements and photochemical modeling. The cumulative evidence suggests that surface snow adjusts slowly to drops in atmospheric H2O2 concentration, over timescales of at least weeks. The H2O2 losses previously observed in pits sampled over more than 1 year are thought to have occurred later in the summer or fall, after the May–July field season. Article in Journal/Newspaper Greenland BORIS (Bern Open Repository and Information System, University of Bern) Conklin ENVELOPE(-111.127,-111.127,55.646,55.646) Greenland Journal of Geophysical Research 100 D9 18661 |
institution |
Open Polar |
collection |
BORIS (Bern Open Repository and Information System, University of Bern) |
op_collection_id |
ftunivbern |
language |
English |
topic |
530 Physics |
spellingShingle |
530 Physics Bales, Roger C. McConnell, Joseph R. Losleben, Mark V. Conklin, Martha H. Fuhrer, Katrin Neftel, Albrecht Dibb, Jack F. Kahl, Jonathan D. W. Stearns, Charles R. Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship |
topic_facet |
530 Physics |
description |
Atmospheric hydrogen peroxide (H2O2) measurements at Summit, Greenland, in May–June, 1993 exhibited a diel variation, with afternoon highs typically 1–2 parts per billion by volume (ppbv) and nighttime lows about 0.5 ppbv lower. This variation closely followed that for temperature; specific humidity exhibited the same general trend. During a 17-day snowfall-free period, surface snow was accumulating H2O2, apparently from nighttime cocondensation of H2O and H2O2. Previous photochemical modeling (Neftel et al., 1995) suggests that daytime H2O2 should be about 1 ppbv, significantly lower than our measured values. Previous equilibrium partitioning measurements between ice and gas phase (Conklin et al., 1993) suggest that air in equilibrium with H2O2 concentrations measured in surface snow (15–18 μM) should have an H2O2 concentration 2–3 times what we measured 0.2–3.5 m above the snow surface. A simple eddy diffusion model, with vertical eddy diffusion coefficients calculated from balloon soundings, suggested that atmospheric H2O2 concentrations should be affected by any H2O2 degassed from surface snow. However, field measurements showed the absence of either high concentrations of H2O2 or a measurable concentration gradient between inlets 0.2 and 3 m above the snow. A surface resistance to degassing, that is, slow release of H2O2 from the ice matrix, is a plausible explanation for the differences between observations and modeled atmospheric profiles. Degassing of H2O2 at a rate below our detection limit would still influence measured atmospheric concentrations and help explain the difference between measurements and photochemical modeling. The cumulative evidence suggests that surface snow adjusts slowly to drops in atmospheric H2O2 concentration, over timescales of at least weeks. The H2O2 losses previously observed in pits sampled over more than 1 year are thought to have occurred later in the summer or fall, after the May–July field season. |
format |
Article in Journal/Newspaper |
author |
Bales, Roger C. McConnell, Joseph R. Losleben, Mark V. Conklin, Martha H. Fuhrer, Katrin Neftel, Albrecht Dibb, Jack F. Kahl, Jonathan D. W. Stearns, Charles R. |
author_facet |
Bales, Roger C. McConnell, Joseph R. Losleben, Mark V. Conklin, Martha H. Fuhrer, Katrin Neftel, Albrecht Dibb, Jack F. Kahl, Jonathan D. W. Stearns, Charles R. |
author_sort |
Bales, Roger C. |
title |
Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship |
title_short |
Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship |
title_full |
Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship |
title_fullStr |
Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship |
title_full_unstemmed |
Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship |
title_sort |
diel variations of h2o2 in greenland: a discussion of the cause and effect relationship |
publisher |
American Geophysical Union |
publishDate |
1995 |
url |
https://boris.unibe.ch/158717/1/bales95jgr.pdf https://boris.unibe.ch/158717/ |
long_lat |
ENVELOPE(-111.127,-111.127,55.646,55.646) |
geographic |
Conklin Greenland |
geographic_facet |
Conklin Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Bales, Roger C.; McConnell, Joseph R.; Losleben, Mark V.; Conklin, Martha H.; Fuhrer, Katrin; Neftel, Albrecht; Dibb, Jack F.; Kahl, Jonathan D. W.; Stearns, Charles R. (1995). Diel variations of H2O2 in Greenland: A discussion of the cause and effect relationship. Journal of Geophysical Research: Atmospheres, 100(D9), pp. 18661-18668. American Geophysical Union 10.1029/95JD01841 <http://dx.doi.org/10.1029/95JD01841> |
op_relation |
https://boris.unibe.ch/158717/ |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1029/95JD01841 |
container_title |
Journal of Geophysical Research |
container_volume |
100 |
container_issue |
D9 |
container_start_page |
18661 |
_version_ |
1774718266043793408 |