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Retrieval of Ozone Column Content from Airborne Sun Photometer Measurements During SOLVE II: Comparison with SAGE III, POAM III,THOMAS and GOME MeasurementsDuring the Second SAGE 111 Ozone Loss and Validation Experiment (SOLVE II), the 14- channel NASA Ames Airborne Trackmg Sunphotometer (AATS-14) was mounted on the NASA DC-8 and successfully measured spectra of total and aerosol optical depth (TOD and AOD) during the sunlit portions of eight science flights. Values of ozone column content above the aircraft have been derived from the AATS-14 data by using a linear least squares method. For each AATS-14 measured TOD spectrum, this method iteratively finds the ozone column content that yields the best match between measured and calculated TOD. The calculations assume the known Chappuis ozone band shape and a three-parameter AOD shape (quadratic in log-log space). Seven of the AATS-14 channels (each employing an interference filter with a nominal full-width at half maximum bandpass of -5 nm) are within the Chappuis band, with center wavelengths between 452.9 nm and 864.5 nm. One channel (604.4 nm) is near the peak, and three channels (499.4, 519.4 and 675.1 nm) have ozone absorption within 30-40% of that at the peak. For the typical DC-8 SOLVE II cruising altitudes of approx. 8-12 km and the background stratospheric aerosol conditions that prevailed during SOLVE 11, absorption of incoming solar radiation by ozone comprised a significant fraction of the aerosol-plus-ozone optical depth measured in the four AATS-14 channels centered between 499.4 and 675.1 nm. Typical AODs above the DC-8 ranged from 0.003-0.008 in these channels. For comparison, an ozone overburden of 0.3 atm-cm (300 DU) translates to ozone optical depths of 0.009,0.014, 0.041, and 0.012, respectively, at these same wavelengths. In this paper, we compare AATS-14 values of ozone column content with temporally and spatially near-coincident values derived from measurements acquired by the Stratospheric Aerosol and Gas Experiment III (SAGE III) and the Polar Ozone and Aerosol Measurement 111 (POAM III) satellite sensors. We also compare AATS-14 ozone retrievals during selected DC-8 latitudinal and longitudinal transects with total column ozone data acquired by the Total Ozone Mapping Spectrometer (TOMS) and the Global Ozone Monitoring Experiment (GOME) satellite sensors. To enable this comparison, the amount of ozone in the column below the aircraft is estimated by combining SAGE and/or POAM data with high resolution, fast response in-situ ozone measurements acquired during the DC-8 ascent at the start of each science flight.
Document ID
20030107847
Acquisition Source
Ames Research Center
Document Type
Conference Paper
Authors
Livingston, J.
(SRI International Corp. Menlo Park, CA, United States)
Schmid, B.
(Bay Area Environmental Research Inst. Sonoma , CA, United States)
Russell, P.
(NASA Ames Research Center Moffett Field, CA, United States)
Eilers, J.
(NASA Ames Research Center Moffett Field, CA, United States)
Kolyer, R.
(NASA Ames Research Center Moffett Field, CA, United States)
Redemann, J.
(Bay Area Environmental Research Inst. Sonoma , CA, United States)
Yee, J.-H.
(Johns Hopkins Univ. Laurel, MD, United States)
Trepte, C.
(NASA Langley Research Center Hampton, VA, United States)
Thomason, L.
(NASA Langley Research Center Hampton, VA, United States)
Pitts, M.
(NASA Langley Research Center Hampton, VA, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Subject Category
Geophysics
Meeting Information
Meeting: SOLVE II/Vintersol Joint Science Team Meeting
Location: Kissimmee, FL
Country: United States
Start Date: October 21, 2003
End Date: October 24, 2003
Funding Number(s)
WBS: WBS 621-60-02-10
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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