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Fine-Scale Comparison of TOMS Total Ozone Data with Model Analysis of an Intense Midwestern CycloneHigh-resolution (approx. 40 km) along-track total column ozone data from the Total Ozone Mapping Spectrometer (TOMS) instrument are compared with a high-resolution mesoscale numerical model analysis of an intense cyclone in the Midwestern United States. Total ozone increased by 100 DU (nearly 38%) as the TOMS instrument passed over the associated tropopause fold region. Complex structure is seen in the meteorological fields and compares well with the total ozone observations. Ozone data support the meteorological analysis showing that stratospheric descent was confined to levels above approx. 600 hPa; significant positive potential vorticity at lower levels is attributable to diabetic processes. Likewise, meteorological fields show that two pronounced ozone streamers extending north and northeastward into Canada at high levels are not bands of stratospheric air feeding into the cyclone; one is a channel of exhaust downstream from the system, and the other apparently previously connected the main cyclonic circulation to a southward intrusion of polar stratospheric air and advected eastward as the cut-off cyclone evolved. Good agreement between small-scale features in the model output and total ozone data underscores the latter's potential usefulness in diagnosing upper tropospheric/lower stratospheric dynamics and kinematics.
Document ID
Document Type
Reprint (Version printed in journal)
External Source(s)
Olsen, Mark A. (Iowa State Univ. of Science and Technology Ames, IA United States)
Gallus, William A., Jr. (Iowa State Univ. of Science and Technology Ames, IA United States)
Stanford, John L. (Iowa State Univ. of Science and Technology Ames, IA United States)
Brown, John M. (National Oceanic and Atmospheric Administration Boulder, CO United States)
Date Acquired
August 20, 2013
Publication Date
August 27, 2000
Publication Information
Publication: Journal of Geophysical Research
Volume: 105
Issue: D16
ISSN: 0148-0227
Subject Category
Meteorology and Climatology
Report/Patent Number
Funding Number(s)
Distribution Limits