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Validation of 10-year SAO OMI Ozone Profile (PROFOZ) product using ozonesonde observations

Guanyu Huang 1 Xiong Liu 1 Kelly Chance 1 Kai Yang 2 Pawan K. Bhartia 3 Zhaonan Cai 1 Marc Allaart 4 Gérard Ancellet 5 Bertrand Calpini 6 Gerrie J. R. Coetzee 7 Emilio Cuevas-Agulló 8 Manuel Cupeiro 9 Hugo de Backer 10 Manvendra K. Dubey 11 Henry Fuelberg 12 Masato Fujiwara 13 Sophie Godin-Beekmann 14 Tristan J. Hall 12 Bryan Johnson 15 Everette Joseph 16 Rigel Kivi 17 Bogumil Kois 18 Ninong Komala 19 Gert König-Langlo 20 Giovanni Laneve 21 Thierry Leblanc 22 Marion Marchand 14 Kenneth R. Minschwaner 23 Gary Morris 24 Michael J. Newchurch 25 Shin-Ya Ogino 26 Nozomu Ohkawara 27 Ankie J. M. Piters 4 Françoise Posny 28, 29 Richard Querel 30 Rinus Scheele 4 Frank J. Schmidlin 3 Russell C. Schnell 15 Otto Schrems 20 Henry Selkirk 31 Masato Shiotani 32 Pavla Skrivánková 33 René Stübi 6 Ghassan Taha 31 David W. Tarasick 34 Anne M. Thompson 3 Valérie Thouret 35 Matthew B. Tully 36 Roeland van Malderen 10 Holger Vömel 37 Peter von Der Gathen 20 Jacquelyn C. Witte 38 Margarita Yela 39 
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : We validate the Ozone Monitoring Instrument (OMI) Ozone Profile (PROFOZ) product from October 2004 through December 2014 retrieved by the Smithsonian Astrophysical Observatory (SAO) algorithm against ozonesonde observations. We also evaluate the effects of OMI row anomaly (RA) on the retrieval by dividing the dataset into before and after the occurrence of serious OMI RA, i.e., pre-RA (2004–2008) and post-RA (2009–2014). The retrieval shows good agreement with ozonesondes in the tropics and midlatitudes and for pressure  < ∼ 50 hPa in the high latitudes. It demonstrates clear improvement over the a priori down to the lower troposphere in the tropics and down to an average of ∼ 550 (300) hPa at middle (high) latitudes. In the tropics and midlatitudes, the profile mean biases (MBs) are less than 6 %, and the standard deviations (SDs) range from 5 to 10 % for pressure  < ∼ 50 hPa to less than 18 % (27 %) in the tropics (midlatitudes) for pressure  > ∼ 50 hPa after applying OMI averaging kernels to ozonesonde data. The MBs of the stratospheric ozone column (SOC, the ozone column from the tropopause pressure to the ozonesonde burst pressure) are within 2 % with SDs of  < 5 % and the MBs of the tropospheric ozone column (TOC) are within 6 % with SDs of 15 %. In the high latitudes, the profile MBs are within 10 % with SDs of 5–15 % for pressure  < ∼ 50 hPa but increase to 30 % with SDs as great as 40 % for pressure  > ∼ 50 hPa. The SOC MBs increase up to 3 % with SDs as great as 6 % and the TOC SDs increase up to 30 %. The comparison generally degrades at larger solar zenith angles (SZA) due to weaker signals and additional sources of error, leading to worse performance at high latitudes and during the midlatitude winter. Agreement also degrades with increasing cloudiness for pressure  > ∼ 100 hPa and varies with cross-track position, especially with large MBs and SDs at extreme off-nadir positions. In the tropics and midlatitudes, the post-RA comparison is considerably worse with larger SDs reaching 2 % in the stratosphere and 8 % in the troposphere and up to 6 % in TOC. There are systematic differences that vary with latitude compared to the pre-RA comparison. The retrieval comparison demonstrates good long-term stability during the pre-RA period but exhibits a statistically significant trend of 0.14–0.7 % year−1 for pressure  < ∼ 80 hPa, 0.7 DU year−1 in SOC, and −0. 33 DU year−1 in TOC during the post-RA period. The spatiotemporal variation of retrieval performance suggests the need to improve OMI's radiometric calibration especially during the post-RA period to maintain the long-term stability and reduce the latitude/season/SZA and cross-track dependency of retrieval quality.
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Submitted on : Friday, July 14, 2017 - 6:31:34 PM
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Guanyu Huang, Xiong Liu, Kelly Chance, Kai Yang, Pawan K. Bhartia, et al.. Validation of 10-year SAO OMI Ozone Profile (PROFOZ) product using ozonesonde observations. Atmospheric Measurement Techniques, European Geosciences Union, 2017, 10 (7), pp.2455-2475. ⟨10.5194/amt-10-2455-2017⟩. ⟨insu-01562352⟩



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