skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: The interpretation of SAGE II ozone measurements in the lower mesosphere

Abstract

SAGE II observations of ozone at sunrise and sunset (solar zenith angle=90{degree}) at approximately the same tropical latitude and on the same day exhibit larger concentrations at sunrise than at sunset between 55 km and 65 km altitude. Because of rapid conversion of atomic oxygen to ozone at sunset and the reverse at sunrise, the onion peeling assumption of constant ozone in the SAGE II retrievals is invalid in this altitude range. The observations are compared against predictions from a one-dimensional model by deriving simulated ozone profiles obtained by applying the onion peel procedure to model results. Good agreement between the observed and modeled sunrise/sunset ratios is then obtained. The results indicate that the SAGE II ozone retrievals overestimate by a factor of 1.3 at sunrise and 1.1 at sunset at 65 km (for example). Between 55 and 60 km altitude the Chapman reactions produce an adequate simulation of the sunrise and sunset ratio, but between 60 and 65 km this ratio is affected by the destruction of O{sub x} by HO{sub x} during the first part of the night. SAGE II ozone profiles between 60 and 65 km altitude thus provide information on mesospheric HO{sub x} chemistry not onlymore » through profiles averages but also through the sunrise/sunset ratio. The observations, for example, indicate an OH concentration at 65 km altitude in the tropics an hour after dark of approximately 8x10{sup 6} cm{sup {minus}3}.« less

Authors:
Publication Date:
Research Org.:
Georgia State Univ., Atlanta, GA (USA)
OSTI Identifier:
5938277
Resource Type:
Miscellaneous
Resource Relation:
Other Information: Thesis (Ph. D.)
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; MESOSPHERE; CHEMICAL COMPOSITION; OZONE; ATMOSPHERIC CHEMISTRY; MONITORING; COMPARATIVE EVALUATIONS; DAILY VARIATIONS; HYDROXIDES; LATITUDE EFFECT; OXYGEN; QUANTITY RATIO; CHEMISTRY; EARTH ATMOSPHERE; ELEMENTS; GEOGRAPHICAL VARIATIONS; HYDROGEN COMPOUNDS; NONMETALS; OXYGEN COMPOUNDS; VARIATIONS; 540110*

Citation Formats

Chu, D C.A. The interpretation of SAGE II ozone measurements in the lower mesosphere. United States: N. p., 1989. Web.
Chu, D C.A. The interpretation of SAGE II ozone measurements in the lower mesosphere. United States.
Chu, D C.A. Sun . "The interpretation of SAGE II ozone measurements in the lower mesosphere". United States.
@article{osti_5938277,
title = {The interpretation of SAGE II ozone measurements in the lower mesosphere},
author = {Chu, D C.A.},
abstractNote = {SAGE II observations of ozone at sunrise and sunset (solar zenith angle=90{degree}) at approximately the same tropical latitude and on the same day exhibit larger concentrations at sunrise than at sunset between 55 km and 65 km altitude. Because of rapid conversion of atomic oxygen to ozone at sunset and the reverse at sunrise, the onion peeling assumption of constant ozone in the SAGE II retrievals is invalid in this altitude range. The observations are compared against predictions from a one-dimensional model by deriving simulated ozone profiles obtained by applying the onion peel procedure to model results. Good agreement between the observed and modeled sunrise/sunset ratios is then obtained. The results indicate that the SAGE II ozone retrievals overestimate by a factor of 1.3 at sunrise and 1.1 at sunset at 65 km (for example). Between 55 and 60 km altitude the Chapman reactions produce an adequate simulation of the sunrise and sunset ratio, but between 60 and 65 km this ratio is affected by the destruction of O{sub x} by HO{sub x} during the first part of the night. SAGE II ozone profiles between 60 and 65 km altitude thus provide information on mesospheric HO{sub x} chemistry not only through profiles averages but also through the sunrise/sunset ratio. The observations, for example, indicate an OH concentration at 65 km altitude in the tropics an hour after dark of approximately 8x10{sup 6} cm{sup {minus}3}.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1989},
month = {1}
}

Miscellaneous:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that may hold this item.

Save / Share: