| Measurement of H<sub>2</sub>O Broadening of O<sub>2</sub> <i>A</i>-Band Transitions and Implications for Atmospheric Remote Sensing. | |
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MedLine Citation:
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PMID: 22452330 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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We present laboratory measurements of H<sub>2</sub>O-broadened <sup>16</sup>O<sub>2</sub> <i>A</i>-band absorption spectra acquired with a laser-based photoacoustic spectroscopy method. This absorption band is widely used in a variety of high-precision atmospheric remote sensing applications. We report H<sub>2</sub>O broadening parameters for six of the strongest transitions in this band, and we show that these measured values are nominally 1.5 - 2 times greater than the corresponding air-broadening parameters. Simulations of atmospheric transmission spectra in the O<sub>2</sub> <i>A</i>-band that incorporate our measured H<sub>2</sub>O broadening parameters indicate that H<sub>2</sub>O present at concentrations typically found in the Earth's atmosphere can influence the column-integrated transmission relative to the dry air case. Further, because of spatial and seasonal variations in humidity, failure to account for the enhanced H<sub>2</sub>O pressure broadening effects can lead to concomitant biases in atmospheric O<sub>2</sub> <i>A</i>-band retrievals of quantities such as surface pressure and pathlength in greenhouse gas retrievals. |
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Authors:
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Eric Michael Vess; Colin James Wallace; Heidi Marie Campbell; Victoria Emad Awadalla; Joseph T Hodges; David Alexander Long; Daniel Keith Havey |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-3-27 |
Journal Detail:
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Title: The journal of physical chemistry. A Volume: - ISSN: 1520-5215 ISO Abbreviation: - Publication Date: 2012 Mar |
Date Detail:
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Created Date: 2012-3-28 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 9890903 Medline TA: J Phys Chem A Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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