ALTIUS. 1 st ALTIUS Symposium (2017) ALTIUS. Atmospheric Limb Tracker for Investigation of the Upcoming Stratosphere

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1 ALTIUS Atmospheric Limb Tracker for Investigation of the Upcoming Stratosphere 1 st ALTIUS Symposium (2017) Synthesis Reference ALT-BR-BISA-PRJ-COM- Symposium_2017_Synthesis Release 1.1 Release date 09/05/2017 Prepared by Jan Thoemel Release 1.1, 09/05/201, Page 1/14

2 Document change record Rel. Date Section(s) Changes /05/2017 NA First release Release 1.1, 09/05/201, Page 2/14

3 Contents 1 Preamble Participation Summary Session1: ALTIUS: Mission objectives and status Session 2: System concept and measurement methods Session 3: Radiative transfer in limb observation geometry Session 4: Retrieval algorithms Session 5: ALTIUS geophysical product validation Session 6: Data usage and applications Session 7: ALTIUS in space: synergies with other instruments Conclusion Appendix: List of Participants Release 1.1, 09/05/201, Page 3/14

4 1 Preamble The first international ALTIUS Symposium took place on the 2 nd and 3 rd May 2017 in the auditorium of the Royal Museum of Natural Sciences in Brussels, Belgium. It was accompanied by an exhibition of scientific posters and two stands of the two sponsors OIP Sensor Systems N.V. and QinetiQ Space Belgium. In total 7 sessions were held over the two days. Networking and scientific debates were facilitated by an ice-breaker cocktail reception and a walking dinner at the end of the first day. The objective of the symposium was to convey the mission concept and the scientific methods that are used for or relate to it. Discussions on scientific collaborations were initiated culminating in an invitation to submit proposals for collaborations through a webform ( Release 1.1, 09/05/201, Page 4/14

5 2 Participation The symposium was excellently attended by in total 101 individuals mostly from the western hemisphere. The vast majority came from Belgium (61). Other countries well represented were Germany (11), France (6) and the United States (6). This is illustrated in Figure 1. Figure 1 Participation per country. In total 36 members of BIRA-IASB where present. Other organizations typically send delegations of in between 1 and 4 persons. This is shown in Figure 2. A balanced mix of agencies, scientific institutions, universities and industry was represented. Industrial participation was Belgian only, with the exception of one representative of CS-Romania. Release 1.1, 09/05/201, Page 5/14

6 Sum o... Institu... ACRI-ST AMOS Ancient-CONSERD BELSPO Bergische Universität BIRA-IASB CNRS-LATMOS CS ROMANIA DLR ECMWF ESA EUMETSAT FMI Forschungeszentrum Jülich GATS IPSL (UPMC/UVSQ) JPL KIT/IMK Lambda-X LATMOS/UPMC/CNRS LPC2E, CNRS-Universite Max Planck Institute NASA NIES NOAA OIP ONERA QinetiQ Space Redu Space Services RMIB ROB Science Systems and Space Applications Services SPACEBEL ULB Ulg Figure 2 Participation per organization. Release 1.1, 09/05/201, Page 6/14

7 3 Summary ALTIUS After the scientific sessions have been concluded the session conveners have been asked to summarize the main points. Those are given in the following. 3.1 Session1: ALTIUS: Mission objectives and status The main statements and conclusions are: The ALTIUS mission is now on track, under ESA supervision. Pre-developments are starting soon as well as an Advisory group. The mission has an operational character (NRT ozone) AND scientific objectives. The space segment PDR (2018) will be followed by GS PDR It is desired to improve S/N by statistics to detect small absorbers Operational character requires lifetime> 3 years 3.2 Session 2: System concept and measurement methods The main statements and conclusions are: There is already a preliminary system design (PROBA-NEXT P200 + OIP payload) available. There is a preliminary PDGS architecture accomplished. For the consolidated products, it was suggested to put the focus more on reliable availability than on timeliness. Metadata (AK, covariance matrices) etc should be accounted for when estimating the data volume. 3.3 Session 3: Radiative transfer in limb observation geometry The main statements and conclusions are: There are several sophisticated 3D vectorial models available. Inter-comparisons between the models are needed. 3.4 Session 4: Retrieval algorithms The main statements and conclusions are: ALTIUS data processing will split into different branches in PDGS: NRT/CP + limb/occult. Presentations on retrievals from OMPS, ACE-Maestro, ALTIUS preliminary retrieval exercise were given. Larry Gordley gave an inspiring talk on innovative methods applicable to imaging instruments, whole star fields occultations and stray light characterization with the moon. Release 1.1, 09/05/201, Page 7/14

8 3.5 Session 5: ALTIUS geophysical product validation Summary of session: J.-C. Lambert (BIRA-IASB) presented validation methodologies and tools applicable to ALTIUS and illustrated them with results from the Multi-TASTE versatile validation system and from the operational validation systems for Sentinel-5P TROPOMI and for CAMS. B. Dils (BIRA-IASB) presented an overview of ground-based validation capabilities offered by the Network for the Detection of Atmospheric Change (NDACC), with highlights on data and format harmonization and operationalisation of this research and monitoring network. T. von Clarmann presented the workplan of the new SPARC activity Towards Unified Error Reporting (TUNER), addressing the harmonization of uncertainty calculation and reporting for 12 stratospheric sounders. Q. Errera (BIRA-IASB) presented the BASCOE Data Assimilation system and demonstrated with MLS-based simulations the value added by future ALTIUS data, as well as BASCOE capabilities for ALTIUS quality assessments and monitoring. The main statements and conclusions are: Sustaining ground-based measurements of quality and pursuing their adaptation to satellite validation needs. Among others, documenting and improving the internal homogeneity of networks. Characterising the (ground and satellite) data and harmonizing their reporting and their uncertainties. Envisioning the adaptation of heritage systems to build an operational ALTIUS validation server. Validating satellite data for their intended use (produce Quality Indicators enabling various users to verify the fitness-for-purpose of ALTIUS). Developing appropriate validation strategies for Level-3/4 data products (including data assimilated products and climatologies). Including the use of alternative retrieval algorithms in the ALTIUS data quality assessment strategy. 3.6 Session 6: Data usage and applications The main statements and conclusions are: ESA CCI -> ALTIUS requirement for daily revisit time, it would make more sense to get better coverage with 3-day revisit: Alexei Rozanov thinks that daily revisit requirement in OPEROZ assumed that coverage would be global in any case; the latter has higher priority. Rolf Muller: OPEROZ was not written for ALTIUS but more as a generic wishlist; it would be good to do an updated OPEROZ-like study with ALTIUS in mind. Martin Kaufmann: what about increasing the horizontal FOV? CAMS: currently unprepared to deal with MLS disappearing: on model side because currently operational CIFS-TM5 has no stratospheric chemistry; and on observation side because no other Release 1.1, 09/05/201, Page 8/14

9 limb instrument is ready for assimilation (not even OMPS-LP). There are many questions about this unpreparedness. Alexei advises Antje to contact data providers; Antje replies she can t test independent datasets, and requires consolidated/standardized datasets as made by ESA CCI. Global ozone review: lots of scientific interest for detailed and improved trend estimates, especially in upper stratosphere and tropical lower stratosphere. ALTIUS will hopefully become a very important contributor to WMO O3 assessment reports (which comes every 4 years) as its period matches the expected recovery era. Recovery period will require detailed, vertically resolved observations SPARC DI: final report (no 8) is out with many achievements; sampling analysis played an important role. Climatology validation approach (comparison of monthly zonal means and their deviations from a multi-instrument mean). Hence there are sampling biases and vertical resolution biases but these were addressed in dedicated papers. Discussion about decreasing trends of Tropical stratospheric ozone (due to ODS in upper stratospheric and BDC acceleration in lower stratosphere): a CMAM study shows that this may have been partly hidden by an increasing trend in tropical tropospheric ozone. CCI+ approved. 3.7 Session 7: ALTIUS in space: synergies with other instruments Summary of session: G. Jaross (NASA) presented OMPS limb capabilities and reported on pointing and stray light issues and their current solutions. C. Zehner (ESA) described the Copernicus Sentinel satellite programme, with details on the upcoming S-5P TROPOMI, on the geostationary Sentinel-4 capabilities and on Sentinel-5. He explained also the current priorities for Sentinel programme expansion. P.-F. Coheur (ULB) presented 10 years of tropospheric and stratospheric composition measurements with IASI, including ozone profile and HNO3 observations as well as detection of SO2 and H2SO4 after volcanic eruptions. R. Damadeo (NASA) presented new capabilities and initial measurements by SAGE-III on ISS. He introduced the SAGE IV concept for future continuity of the SAGE series. The main statements and conclusions are: Synergies for inter calibration (GSICS type) are to be assessed Common solar reference spectrum shall be used Synergistic retrieval of tropospheric data from nadir and limb measurements is seen as an opportunity Synergies for inter-validation between ALTIUS, OMPS, SAGE-III/IV are seen as important Established standards (data formats, units etc.) need to be adopted. How can limb sounders be included in future programmes? Release 1.1, 09/05/201, Page 9/14

10 4 Conclusion The overall feedback received verbally was very positive. Participants appreciated the excellent organization, the programme and scientific discussions. The organizers were able to strengthen position within the scientific limb Earth observation community and to brainstorm potential collaborations. Therefore the symposium is considered a success. Release 1.1, 09/05/201, Page 10/14

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