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Examination of observed hydroxyl column abundance behaviors using a mesospheric model
Title
Examination of observed hydroxyl column abundance behaviors using a mesospheric model.
Creator
Liu, Yan, Florida Atlantic University, Burnett, Elizabeth B., Burnett, Clyde R.
Abstract/Description
OH vertical column abundances have been measured since 1977. Based on this long-term data base, the terrestrial OH abundance trends, such as the high-sun (secX = 1) enhancement of the zenith angle dependence, seasonal variations, and diurnal behaviors, have been observed. Current atmospheric models do not predict these features. In this thesis, a one dimensional photochemical model of the mesosphere has been constructed in order to examine the possibility that these observed effects might...
Show moreOH vertical column abundances have been measured since 1977. Based on this long-term data base, the terrestrial OH abundance trends, such as the high-sun (secX = 1) enhancement of the zenith angle dependence, seasonal variations, and diurnal behaviors, have been observed. Current atmospheric models do not predict these features. In this thesis, a one dimensional photochemical model of the mesosphere has been constructed in order to examine the possibility that these observed effects might originate in this region of the atmosphere. Transport effects are not considered. The model result demonstrates that the observed OH behaviors are not caused by known photochemical reactions in the mesosphere.
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Date Issued
1990
PURL
http://purl.flvc.org/fcla/dt/14579
Subject Headings
Atmospheric ozone, Photochemistry
Format
Document (PDF)
OBSERVATIONS OF ATMOSPHERIC HYDROXYL AND THEIR SIGNIFICANCE TO MIDDLE ATMOSPHERIC PHOTOCHEMISTRY
Title
OBSERVATIONS OF ATMOSPHERIC HYDROXYL AND THEIR SIGNIFICANCE TO MIDDLE ATMOSPHERIC PHOTOCHEMISTRY.
Creator
MINSCHWANER, KENNETH ROBERT, Florida Atlantic University
Abstract/Description
Observations of the vertical column abundance of atmospheric hydroxyl (OH) have been made using a Pepsios (polyetalon pressure-scanned interferometric optical spectrometer). The measurements were taken at both Fritz Peak, Colorado (40°N) and Boca Raton, Florida (26° N) during the period 1985-86. These are high resolution measurements of the resonance absorption of sunlight by OH in the P1(1) A^2 sigma - x^2 pi (0,0) transition at 3081.66 A. The observations are of relevance to the problem of...
Show moreObservations of the vertical column abundance of atmospheric hydroxyl (OH) have been made using a Pepsios (polyetalon pressure-scanned interferometric optical spectrometer). The measurements were taken at both Fritz Peak, Colorado (40°N) and Boca Raton, Florida (26° N) during the period 1985-86. These are high resolution measurements of the resonance absorption of sunlight by OH in the P1(1) A^2 sigma - x^2 pi (0,0) transition at 3081.66 A. The observations are of relevance to the problem of stratospheric ozone reduction by man-made pollution. Attempts to model the photochemistry of the middle atmosphere and to predict its response to these pollutants depend heavily on an accurate observational data base of many middle atmospheric constituents. This OH data base contributes information which is of critical importance to theories describing middle atmospheric processes. The author's measurements are discussed within the context of the ten-year data base accumulated by Dr. Clyde Burnett. Observed geographic and seasonal regularities, as well as short-period excursions in the OH abundances, have not been fully explained by current photochemical theory.
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Date Issued
1987
PURL
http://purl.flvc.org/fcla/dt/14357
Subject Headings
Atmospheric ozone, Photochemistry
Format
Document (PDF)
MEASUREMENTS OF TERRESTRIAL OH ABUNDANCES BY SPECTROSCOPIC OBSERVATION OF RESONANCE ABSORPTION OF SUNLIGHT
Title
MEASUREMENTS OF TERRESTRIAL OH ABUNDANCES BY SPECTROSCOPIC OBSERVATION OF RESONANCE ABSORPTION OF SUNLIGHT.
Creator
SPERANZA, PATRICK DANIEL, Florida Atlantic University, Charles E. Schmidt College of Science, Department of Physics
Abstract/Description
Measurements of the atmospheric hydroxyl radical (OH) abundance were made at Boca Raton, Florida, (26° 22' N, 80° 6' W) during the period March 14 through April 9, 1977. Observations were made on the P1(1) line of the A^2sigma+ - x^2pi(0,0) rotation band of OH at 3081.7A. By the use of the high resolution Pepsios (poly-etalon pressure scanning interferometric optical spectrometer) spectrometer, the narrow absorption curve due to terrestrial OH was distinguished from the broad solar Fraunhofer...
Show moreMeasurements of the atmospheric hydroxyl radical (OH) abundance were made at Boca Raton, Florida, (26° 22' N, 80° 6' W) during the period March 14 through April 9, 1977. Observations were made on the P1(1) line of the A^2sigma+ - x^2pi(0,0) rotation band of OH at 3081.7A. By the use of the high resolution Pepsios (poly-etalon pressure scanning interferometric optical spectrometer) spectrometer, the narrow absorption curve due to terrestrial OH was distinguished from the broad solar Fraunhofer line. Measurements of the amount of atmospheric OH absorption indicated an average vertical column abundance of (2.0 +- 0.8) (10^13) molecules/cm^2 for this observation period.
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Date Issued
1977
PURL
http://purl.flvc.org/fcla/dt/13848
Subject Headings
Hydroxides--Absorption and adsorption, Atmospheric ozone
Format
Document (PDF)