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First Reprocessing of Southern Hemisphere Additional Ozonesondes (SHADOZ) Ozone Profiles (1998-2016): 2. Comparisons With Satellites and Ground-Based Instruments

Thompson, Anne M. and Witte, Jacquelyn C. and Sterling, Chance and Jordan, Allen and Johnson, Bryan J. and Oltmans, Samuel J. and Fujiwara, Masatomo and Vömel, Holger and Allaart, Marc and Piters, Ankie and Coetzee, Gert J. R. and Posny, Françoise and Corrales, Ernesto and Diaz, Jorge Andres and Félix, Christian and Komala, Ninong and Lai, Nga and Ahn Nguyen, H. T. and Maata, Matakite and Mani, Francis S. and Zainal, Zamuna and Ogino, Shin-ya and Paredes, Francisco and Penha, Tercio Luiz Bezerra and Silva, Francisco Raimundo and Sallons-Mitro, Sukarni and Selkirk, Henry B. and Schmidlin, F. J. and Stübi, Rene and Thiongo, Kennedy (2017) First Reprocessing of Southern Hemisphere Additional Ozonesondes (SHADOZ) Ozone Profiles (1998-2016): 2. Comparisons With Satellites and Ground-Based Instruments. Journal of Geophysical Research, 122 (23). pp. 13000-13025. ISSN 2156-2202

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Abstract The Southern Hemisphere ADditional OZonesonde (SHADOZ) network was assembled to validate a new generation of ozone-monitoring satellites and to better characterize the vertical structure of tropical ozone in the troposphere and stratosphere. Beginning with nine stations in 1998, more than 7,000 ozone and P-T-U profiles are available from 14 SHADOZ sites that have operated continuously for at least a decade. We analyze ozone profiles from the recently reprocessed SHADOZ data set that is based on adjustments for inconsistencies caused by varying ozonesonde instruments and operating techniques. First, sonde-derived total ozone column amounts are compared to the overpasses from the Earth Probe/Total Ozone Mapping Spectrometer, Ozone Monitoring Instrument, and Ozone Mapping and Profiler Suite satellites that cover 1998-2016. Second, characteristics of the stratospheric and tropospheric columns are examined along with ozone structure in the tropical tropopause layer (TTL). We find that (1) relative to our earlier evaluations of SHADOZ data, in 2003, 2007, and 2012, sonde-satellite total ozone column offsets at 12 stations are 2% or less, a significant improvement; (2) as in prior studies, the 10 tropical SHADOZ stations, defined as within ±19° latitude, display statistically uniform stratospheric column ozone, 229 ± 3.9 DU (Dobson units), and a tropospheric zonal wave-one pattern with a 14 DU mean amplitude; (3) the TTL ozone column, which is also zonally uniform, masks complex vertical structure, and this argues against using satellites for lower stratospheric ozone trends; and (4) reprocessing has led to more uniform stratospheric column amounts across sites and reduced bias in stratospheric profiles. As a consequence, the uncertainty in total column ozone now averages 5%.

Item Type: Journal Article
Uncontrolled Keywords: ozone, ozonesondes, SHADOZ, OMI, tropical tropopause layer
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Q Science > QD Chemistry
Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
Depositing User: Fulori Nainoca - Waqairagata
Date Deposited: 16 Aug 2018 03:31
Last Modified: 16 Aug 2018 03:31

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