Adsorption of HOx on aerosol surfaces: implications for the atmosphere of Mars

A. D. Anbar; M. T. Leu; H. A. Nair; Y. L. Yung

doi:10.1029/93je00132

Adsorption of HO_x on aerosol surfaces: implications for the atmosphere of Mars

A. D. Anbar, M. T. Leu, H. A. Nair, Y. L. Yung

Research output: Contribution to journal › Article › peer-review

19 Scopus citations

Abstract

We find that adsorption of HO₂ on dust (γ_HO2≥0.01), or ice near 30 km (γ_HO2 ≥0.1), can deplete OH abundances in the lower atmosphere by 10% or more. Such depletions approach those obtained by lowering the water vapor abundance by an order of magnitude below the global average observed by Viking (~ 25%). Since the oxidation of CO is catalyzed by HO_x in the lower atmosphere via the reaction CO + OH → CO₂ + H, loss of OH due to adsorption of HO₂ on dust or ice at low altitudes could have a significant effect on the ratio CO:CO₂. The adsorption of H on ice at 50 km (γ_H≥ 0.01) can result in even larger OH depletions. However, this effect is localized to altitudes >40 km, where CO oxidation is relatively unimportant. Laboratory data suggest that γ_HO2 ~ 0.01 is a reasonable estimate for adsorption on dust. -from Authors

Original language	English (US)
Pages (from-to)	10,933-10,940
Journal	Journal of geophysical research
Volume	98
Issue number	E6
DOIs	https://doi.org/10.1029/93je00132
State	Published - 1993
Externally published	Yes

ASJC Scopus subject areas

Geophysics
Forestry
Oceanography
Aquatic Science
Ecology
Water Science and Technology
Soil Science
Geochemistry and Petrology
Earth-Surface Processes
Atmospheric Science
Earth and Planetary Sciences (miscellaneous)
Space and Planetary Science
Palaeontology

Access to Document

10.1029/93je00132

Cite this

@article{a66ccd5060664454beb310ce81269514,

title = "Adsorption of HOx on aerosol surfaces: implications for the atmosphere of Mars",

abstract = "We find that adsorption of HO2 on dust (γHO2≥0.01), or ice near 30 km (γHO2 ≥0.1), can deplete OH abundances in the lower atmosphere by 10% or more. Such depletions approach those obtained by lowering the water vapor abundance by an order of magnitude below the global average observed by Viking (~ 25%). Since the oxidation of CO is catalyzed by HOx in the lower atmosphere via the reaction CO + OH → CO2 + H, loss of OH due to adsorption of HO2 on dust or ice at low altitudes could have a significant effect on the ratio CO:CO2. The adsorption of H on ice at 50 km (γH≥ 0.01) can result in even larger OH depletions. However, this effect is localized to altitudes >40 km, where CO oxidation is relatively unimportant. Laboratory data suggest that γHO2 ~ 0.01 is a reasonable estimate for adsorption on dust. -from Authors",

author = "Anbar, {A. D.} and Leu, {M. T.} and Nair, {H. A.} and Yung, {Y. L.}",

year = "1993",

doi = "10.1029/93je00132",

language = "English (US)",

volume = "98",

pages = "10,933--10,940",

journal = "Journal of geophysical research",

issn = "0148-0227",

publisher = "Wiley-Blackwell",

number = "E6",

}

TY - JOUR

T1 - Adsorption of HOx on aerosol surfaces

T2 - implications for the atmosphere of Mars

AU - Anbar, A. D.

AU - Leu, M. T.

AU - Nair, H. A.

AU - Yung, Y. L.

PY - 1993

Y1 - 1993

N2 - We find that adsorption of HO2 on dust (γHO2≥0.01), or ice near 30 km (γHO2 ≥0.1), can deplete OH abundances in the lower atmosphere by 10% or more. Such depletions approach those obtained by lowering the water vapor abundance by an order of magnitude below the global average observed by Viking (~ 25%). Since the oxidation of CO is catalyzed by HOx in the lower atmosphere via the reaction CO + OH → CO2 + H, loss of OH due to adsorption of HO2 on dust or ice at low altitudes could have a significant effect on the ratio CO:CO2. The adsorption of H on ice at 50 km (γH≥ 0.01) can result in even larger OH depletions. However, this effect is localized to altitudes >40 km, where CO oxidation is relatively unimportant. Laboratory data suggest that γHO2 ~ 0.01 is a reasonable estimate for adsorption on dust. -from Authors

AB - We find that adsorption of HO2 on dust (γHO2≥0.01), or ice near 30 km (γHO2 ≥0.1), can deplete OH abundances in the lower atmosphere by 10% or more. Such depletions approach those obtained by lowering the water vapor abundance by an order of magnitude below the global average observed by Viking (~ 25%). Since the oxidation of CO is catalyzed by HOx in the lower atmosphere via the reaction CO + OH → CO2 + H, loss of OH due to adsorption of HO2 on dust or ice at low altitudes could have a significant effect on the ratio CO:CO2. The adsorption of H on ice at 50 km (γH≥ 0.01) can result in even larger OH depletions. However, this effect is localized to altitudes >40 km, where CO oxidation is relatively unimportant. Laboratory data suggest that γHO2 ~ 0.01 is a reasonable estimate for adsorption on dust. -from Authors

UR - http://www.scopus.com/inward/record.url?scp=0027796738&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=0027796738&partnerID=8YFLogxK

U2 - 10.1029/93je00132

DO - 10.1029/93je00132

M3 - Article

AN - SCOPUS:0027796738

SN - 0148-0227

VL - 98

SP - 10,933-10,940

JO - Journal of geophysical research

JF - Journal of geophysical research

IS - E6

ER -

Adsorption of HO_x on aerosol surfaces: implications for the atmosphere of Mars

Abstract

ASJC Scopus subject areas

Access to Document

Other files and links

Fingerprint

Cite this