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First Reprocessing of Southern Hemisphere Additional Ozonesondes (SHADOZ) Ozone Profiles (1998–2016): 2. Comparisons With Satellites and Ground‐Based Instruments
Author(s) -
Thompson Anne M.,
Witte Jacquelyn C.,
Sterling Chance,
Jordan Allen,
Johnson Bryan J.,
Oltmans Samuel J.,
Fujiwara Masatomo,
Vömel Holger,
Allaart Marc,
Piters Ankie,
Coetzee Gert J. R.,
Posny Françoise,
Corrales Ernesto,
Diaz Jorge Andres,
Félix Christian,
Komala Nig,
Lai Nga,
Ahn Nguyen H. T.,
Maata Matakite,
Mani Francis,
Zainal Zamuna,
Ogino Shinya,
Paredes Francisco,
Penha Tercio Luiz Bezerra,
Silva Francisco Raimundo,
SallonsMitro Sukarni,
Selkirk Henry B.,
Schmidlin F. J.,
Stübi Rene,
Thiongo Kennedy
Publication year - 2017
Publication title -
journal of geophysical research: atmospheres
Language(s) - English
Resource type - Journals
eISSN - 2169-8996
pISSN - 2169-897X
DOI - 10.1002/2017jd027406
Subject(s) - stratosphere , ozone , ozone layer , total ozone mapping spectrometer , troposphere , tropopause , environmental science , atmospheric sciences , tropospheric ozone , northern hemisphere , southern hemisphere , satellite , ozone monitoring instrument , microwave limb sounder , quasi biennial oscillation , meteorology , climatology , geology , geography , physics , astronomy
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%.