Ozone_cci Achievements

Transcription

1 Ozone_cci Achievements What data sets are you producing and how are they used? M. Van Roozendael, on behalf of the Ozone_cci consortium 6 th CCI Colocation Meeting, 29 Sep 1 Oct, ESA/ESRIN, Frascati 1

2 Ozone_cci objectives Realize the full potential of the long-term global EO archives that ESA, together with its Member states, has established over the last thirty years Improve & harmonize level-2 algorithms Improve & harmonize level-3 algorithms Generate consistent NetCDF-CF formatted data GCOS requirements Distribute products on Ozone_cci web-site free access Common approach to error characterization Validation and information content analysis à systematic assessment of compliance against GCOS and user requirements Assess usability and usefulness for Climate Users 2

3 GCOS requirements for Ozone ECV Target Requirements Variable/ Parameter Horizontal Resolution Vertical Resolution Temporal Resolution Accuracy Stability Ozone profile in upper stratosphere and mesosphere Ozone profile in upper troposphere and lower stratosphere k m k m 3km daily 5-20% <1% 1-2km 4h 10% 1% Total ozone 20-50km N/A 4h Max (2%; 5 DU) Tropospheric ozone 20-50km 5km 4h 10-15% 1% <1% GCOS-154, Dec

4 Ozone_cci Data Products Total ozone and ozone profiles from nadir sensors in 0-50 km altitude range Stratospheric profiles from limb and occultation sensors in km altitude range Tropospheric ozone products using various approaches 1. Nadir, 2. Limb, 3. Occultation 4

5 Platforms and Sensors Agency Satellite platform Sensor Time period ESA ERS-2 GOME ESA ENVISAT SCIAMACHY GOMOS MIPAS EUMETSAT METOP-A GOME2-A IASI-A METOP-B GOME2-B IASI-B NASA NPP-Suomi OMPS SNSB CSA ODIN OSIRIS SMR CSA SCISAT ACE 5

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7 Total ozone Main achievements: Common baseline level-2 retrieval algorithm applied to GOME, SCIAMACHY, GOME-2 and OMI sensors ( ) Transfer to OMPS planned (2016) Uses a highly accurate direct-fitting retrieval approach (GODFIT) Extensive validation using GAW-WMO Brewer/Dobson networks Corresponding GTO-CCI merged level-3 data set used in WMO Scientific Assessment of Ozone Depletion 2014 Validation of OMI-CCI ozone columns against Brewer data Koukouli et al, AUTH 7

8 Nadir ozone profiles Ozone profile scheme selected from Round-Robin Jan-June 2008 July-Dec Transferred to CEMS high performance computing environment enabling processing of entire GOME-2 mission in ~7 days Complete processing of 7-year GOME-2 mission, providing profiles including tropospheric information Complete processing of GOME-1 and SCIAMACHY OMI processing planned by end of CCI Phase-II GOME-2 global ozonesonde comparison (30 day mean) Lower tropospheric ozone New CCI v1 (monthly mean) Linear interpola2on (vmr/pressure) Updated degrada2on correc2on Updated residual correc2ons 8

9 HARMonized dataset of OZone profiles (HARMOZ) HARMOZ is the collection of ozone profiles from individual instruments, which are: screened for invalid data by the instrument experts presented on the same pressure grid written in the same netcdf-4 format Bias tables are provided for each pair of instruments 9

10 Extensive validation Methodology of validation process Informa2on content study Pieces of independent informa2on Algorithm #1 Algorithm #2 Dependence on ozone column Algorithm #1 Algorithm #2 Keppens et al., AMTD

11 WMO Ozone assessment 2014 Ozone CCI data sets have been used in the recent WMO Ozone Assessment report for evaluation of ozone trends in columns and profiles Figures adapted from WMO ozone assessment (2014) 11

12 Regional ozone trends Total ozone trends ( ) on global and regional scales have been estimated Trends in middle latitudes are still not significant; recovery masked by natural variability; additional 5-10 years of observations are required Coldewey-Egbers et al., GRL,

13 ECMWF ERA-5 reanalysis Round-Robin to assess the merits of several ozone data sets as an input to the assimilation (R. Dragani) 6 CCI data sets included and tested Positive impact on assimilated, demosntrated against MLS used as reference Recommendations for inclusion of CCI data 13

14 CRG perspective on data use WMO,

15 Publications and plans for CMIPs Approximately 30 publications in peer-reviewed journals resulting from Ozone_cci activities and data sets Plans for submission of ozone data to Obs4MIPs Ø Ø Based on consolidated level-3 data sets, covering extended time period One merged total ozone data set based on GOME, SCIAMACHY, GOME-2 and OMI (GTO-ECV) Ø One merged ozone profile data set (details to be ) Ø Time-frame for submission: end of

16 Thank you for your attention! 16