Variations in the free chlorine content of the stratosphere (1991-1997): Anthropogenic, volcanic, and methane influences

Journal Article · Sun Feb 27 04:00:00 EST 2000 · Journal of Geophysical Research

DOI:https://doi.org/10.1029/1999JD901039· OSTI ID:20216297

Froidevaux, L ^[1]; Waters, J W ^[1]; Read, W G ^[1]; Connell, P S ^[2]; Kinnison, D E ^[2]; Russell, III, J M ^[3]

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1. Jet Propulsion Laboratory, California Institute of Technology, Pasadena, California (United States)
2. Lawrence Livermore National Laboratory, Livermore, California (United States)
3. Center for Atmospheric Sciences, Hampton University, Hampton, Virginia (United States)

Remote sensing of chlorine monoxide (ClO) by the Microwave Limb Sounder experiment aboard the Upper Atmosphere Research Satellite (UARS) has provided global measurements of variations in stratospheric free chlorine for 1991-1997. Linear trends were obtained from a multiple regression analysis of this data set at low latitudes and midlatitudes. ClO increases in the upper stratosphere (2 hPa) are significantly larger than expected from trends in chlorine source gases alone. Much of the upper stratospheric ClO variability can be explained by changes in CH{sub 4}, as measured by the UARS Halogen Occultation Experiment. Decreasing ClO in the lower stratosphere is consistent with a relaxation from a chemically perturbed state attributed to the 1991 Mt. Pinatubo eruption. (c) 2000 American Geophysical Union.

• OSTI ID: 20216297
• Journal Information: Journal of Geophysical Research, Journal Name: Journal of Geophysical Research Journal Issue: D4 Vol. 105; ISSN JGREA2; ISSN 0148-0227
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
ATMOSPHERIC CHEMISTRY
CHLORINE
EXPERIMENTAL DATA
MIXING RATIO
REMOTE SENSING
STRATOSPHERE
TIME-SERIES ANALYSIS