WORLD METEOROLOGICAL ORGANIZATION GLOBAL ATMOSPHERE WATCH GAW INFORMATION SHEET No. 22 January-April 2002 INFORMAL REPORT Not for publication GAW INFORMATION SHEET January-April 2002 Number 22 Global Ozone Monitoring Experiment (GOME) User Consultation Meeting A meeting of 26 experts from 9 countries was hosted by European Space Agency (ESA) in Frascati, Italy from 28 to 29 January 2002 to report on recent activities of ESA regarding the GOME total ozone satellite measurements and their total ozone product development. Community concerns regarding recent failures and calibration problems with the TOMS series of ozone monitoring instruments were expressed as was a strong rationale for GOME to further improve its data products for ozone trend analysis and near-real-time applications. In this context, the scope of this meeting was, on the one hand to report to users on ESA activities related to the GOME total ozone product development and, on the other hand to get feedback from the GOME user community on requirements for ozone trend monitoring. Presentations and detailed discussions were held on the status of ongoing developments for GOME total ozone product improvements beyond the ongoing operational GOME Data Processor upgrade. A GAW representative expressed a strong interest in these activities as being important for future WMO Antarctic ozone hole bulletins and for providing continuity in ozone trend assessments on global scales. Thirteenth session of CAS The thirteenth session of the WMO Commission for Atmospheric Sciences (CAS), which is one of the eight WMO technical commissions, was held in Oslo, Norway from 12 to 20 February 2002 under the chairmanship of Professor A. Eliassen, Norway. The CAS is the Commission responsible, inter alia, for research in atmospheric and related sciences and for co-ordination of the operation and further development of the Global Atmosphere Watch (GAW). The CAS-XIII Report is available at http://www.wmo.ch/web/catalogue/New%20HTML/frame/engfil/941.html and the CAS-XIII documents at ftp://www.wmo.ch/Documents/sessions/CAS-XIII. Information on the GAW activities since CAS-XII, held in 1998, was presented by Professor O. Hov, Chairman of the Executive Council Panel of Experts/CAS Working Group on Environmental Pollution and Atmospheric Chemistry (EC Panel) and by the WMO Secretariat. In considering the implementation of GAW the Commission was satisfied with the continued progress in that important WMO activity, it fully supported the Strategy for the Implementation of the GAW Programme for 2001-2007 prepared by the Secretariat and agreed that added weight should be given to the work of regional stations to address urgent regional or even national environmental issues. The CAS also welcomed the active participation of GAW in the multi-agency IGOS to integrate the major satellite and ground-based observation systems and positive developments in the GAW GURME project proposed by CAS-XII. With regard to GAW data handling and use, the CAS supported the opinion of the EC Panel that the GAW World Data Centres should continue providing free, unrestricted and user-friendly access to their data for scientific purposes. The CAS appreciated the offer of the Japan Meteorological Agency to consider possibility of including surface ozone data at the WDC for greenhouse gases. The Commission also reiterated that quality assurance should remain one of the most important tasks for GAW and recommended that calibrations, instrument intercomparisons and laboratory performance audits should continue on a regular basis and encompass as many GAW stations as possible. The CAS recommended considering the possibility to have more global scientific assessments, for instance, on aerosols and greenhouse gases, in support of International Conventions. -2- Finally, the CAS recommended that the EC Panel of Experts/CAS Working Group on Environmental Pollution and Atmospheric Chemistry be re-established with modified terms of reference (see CAS-XIII Report, Recommendation 1) and with the following composition: Mr O. Hov, Norway (Chairman), Mr W. Kimani, Kenya (rapporteur on changes in atmospheric composition on a long-term basis), Messrs Xu Xiangde, China and B. Hicks (rapporteurs on the urban atmospheric environment), Mr Y. Tsaturov, Russia (rapporteur on atmospheric transport and deposition of pollutants including modelling), Mr H. Matsueda, Japan (rapporteur on greenhouse gases including their effects on climate change), Mr E. Piacentini, Argentina (rapporteur on atmospheric ozone and ultraviolet radiation), Mr J. Gras, Australia (rapporteur on aerosols), Ms R. Simeva, FYR of Macedonia (rapporteur on reactive gases), Mr S. Penkett, UK (rapporteur on atmospheric chemical system modelling), Mr M. Bittner, Germany (rapporteur on satellite measurements of atmospheric constituents), and Mr G. Müller, Switzerland (rapporteur on strategic planning and implementation of GAW). ESCAP/WMO Project on Haze A Workshop on Monitoring/Modeling Activities in support of ASEAN's Regional Haze Action Plan was held in Jakarta, Indonesia from 20 to 21 February 2002, kindly hosted by the Meteorological and Geophysical Agency (BMG) of Indonesia. The workshop can be viewed as complementary to the meeting that took place in September 2001 in Singapore and which was reported in Information Sheet No. 21. Participants representing ASEAN, ESCAP, SE Asian countries affected by regional haze episodes and WMO-GAW were in attendance. The workshop had three major objectives: improve regional monitoring through better instrumentation, develop indigenous modeling capabilities and promote co-operation between the various stakeholders. With respect to monitoring, the meeting identified five sites in the region together with the appropriate instrument types (two in Indonesia and three in Malaysia). As regards modeling, the participants had before them a consultant's report on regional aerosol transport studies during and after the 1997 and 1998 haze episodes. The report also focussed on future modeling requirements including the need for validation studies and improved parameterization of critical physical processes. Meeting of the SAG UV The 7th meeting of the GAW Scientific Advisory Group (SAG) on UV radiation was held from 4 to 6 March at the Physikalisch-Meteorologisches Observatorium, World Radiation Centre (PMOD/WRC) in Davos, Switzerland. The meeting reviewed the activities of the SAG working groups. The QA report was accepted with minor editorial changes. The Broadband instrument document will be subject to a final review. Closer contact with the BSRN programme was thought to be important. The hosts gave an interesting presentation of their activities. Workshop on Arctic Ozone Loss A workshop on Arctic ozone loss was supported by SPARC/WCRP and held from 4 to 6 March 2002 in Potsdam, Germany. Over the last decade tremendous progress has been made toward quantifying and understanding the degree of chemical ozone loss in the Arctic stratosphere. Today a variety of experimental approaches exist to estimate the degree of chemical loss of ozone over the course of an Arctic winter. Additionally, a wide range of chemical models have been used to help understand the processes in the wintertime Arctic stratosphere and to calculate the degree of ozone loss. However, concerns have been expressed about the degree of maturity of current chemical models of the polar stratospheric chemistry. With this in mind the main goals of the workshop were: -3 To assess the degree of uncertainty that is connected with current approaches to measure chemical ozone loss in the Arctic. To examine the accuracy of measurements of halogen radicals and our understanding of the chlorine budget. To find out if there are any major gaps in our current understanding of the Arctic ozone loss, and to identify the conditions which are most problematic for up to date chemical models. What can we learn from the Antarctic ? Over the next few years one of the major challenges for the scientific community will be to predict the future of the Arctic ozone layer in a scenario of decreasing stratospheric halogen loading and climate change. A solid assessment of our ability to reproduce currently observed ozone losses with model calculations is indispensable to determine the requirement for future research and to correctly interpret the reliability of model based predictions for the future. Working Group on Wildland Fire The third meeting of the Working Group on Wildland Fire of the Inter-Agency Task Force for Disaster Reduction (WG 4) was held from 9 to 10 March at the Global Fire Monitoring Center (GFMC) in Freiburg, Germany. The meeting drafted a WG 4 position statement for inclusion in the ISDR Background document for the World Summit on Sustainable Development (WSSD). It was noted that wildfires are the one natural disaster that can be minimized through local actions that reduce the potential fire occurrence. Fire data availability, satellite activities related to fire detection, and upcoming wildland fire conferences were discussed. EMEP Task Force and EIONET Workshop WMO and GAW hosted the Third meeting of the Task Force on Measurement and Monitoring (TFMM) of the Co-operative Programme for Monitoring and Evaluation of the Longrange Transmission of Air Pollutants in Europe (EMEP) from 19 to 22 March 2002. The first part of the meeting acted as a joint session with the seventh Workshop on Air Quality Management and Assessment of the European Environment Information and Observation Network (EIONET) and examined the harmonization of data reporting, as well as questions related to particulate matter. The TFMM is co-chaired by WMO/GAW. The meeting was opened by the Deputy Secretary-General of WMO who emphasized the importance of the close collaboration between GAW and EMEP. He also stressed the importance that WMO attached to the issue of particulate matter pollution and to the international co-operation on POPs, as confirmed by decisions of WMO governing bodies. Thirty two countries and the EU who are all Parties to the Convention were in attendance, together with participants from Albania and Japan. The session developed proposals for further work to revise the EMEP monitoring strategy, and to further develop the monitoring manual for particulate matter. It also discussed progress in the preparation of the assessment report on the changes in transboundary fluxes, depositions and concentration. GAW expects to play a part in this assessment which will cover the first 20 years of implementation of the Convention. The TFMM also reviewed the status of work on POPs and further discussed the differences between the Lagrangian and Eulerian models. The report and presentations made at the TFMM are available on the Internet at www.ubavie.gv.at/tfmm and the report only at http://www.unece.org/env/emep/emep_docs.html (document 4). -4The Fifth Meeting of the Ozone Research Managers of the Parties to the Vienna Convention for the Protection of the Ozone Layer The Fifth Meeting of the Ozone Research Managers of the Parties to the Vienna Convention for the Protection of the Ozone Layer was hosted by WMO and UNEP in Geneva from 25 to 27 March 2002. The aim of the meeting was to review ongoing national and international research and ozone monitoring programmes to ensure their proper co-ordination and implementation, as called for in the Vienna Convention. Presentations on the state of the ozone layer were made by representatives of the 2002 Scientific Assessment of Ozone and the 2002 Environmental Effects Assessment Panel. About 50 countries made individual presentations concerning their range of ozone activities with respect to systematic observations and research. In addition, representatives from the Network for the Detection of Stratospheric Change, the Intergovernmental Panel on Climate Change, Stratospheric Processes and their Role in Climate and WMO's Global Atmosphere Watch also informed the meeting on their complimentary ozone activities. An opportunity was provided for delegates to pose questions and comment on key issues raised, as input to the recommendations. Using information from these presentations, the Parties agreed on a set of recommendations which are targeted at specific actions. The recommendations are intended to improve and enhance ozone observations (both spatially and temporally) and archiving, to provide for improved capacity building opportunities for developing countries, and to address research gaps in our understanding of feedback mechanisms between ozone depletion and climate change. The recommendations will be presented to the forthcoming Sixth meeting of the Conference of the Parties to the Vienna Convention to be held in conjunction with the Fourteenth Meeting of the Parties to the Montreal Protocol on Substances that Deplete the Ozone Layer (Rome, 25 to 29 November, 2002). CCQM Workshop on Traceability The Consultative Committee for Amount of Substances (CCQM) is a Bureau International des Poids et Mesures (BIPM) committee. Its members are mainly national metrological (not meteorological!) and standards institutes and materials research and testing laboratories. The BIPM has expressed an interest in the work of WMO in general, and in calibration gases in GAW in particular. A Memorandum of Understanding has been prepared between WMO and BIPM. For the first time a representative for the GAW programme participated in a CCQM Workshop, this time on traceability, from 16 to 17 April 2002 at the BIPM in Sèvres (Paris), France. On 15 April the CCQM Working Group on Gas Analysis met, GAW was an invited guest and discussions on the possible collaboration between CCQM and GAW was a major item on the agenda. A presentation was made in both meetings on the GAW programme, including calibration procedures for ozone, greenhouse gases and UV radiation. Several of the participants indicated they already had some contact with GAW. The aim of the Traceability Workshop was to provide a clear description of the measurement infrastructures currently in place for chemical measurements, and how these can be used by 'field' laboratories to enable them to achieve reliable, comparable and traceable measurement results. The traceability chain and the role of National Metrological Institutes (NMIs) and other authorities within this chain were examined. It was very worthwhile to make this connection between BIPM and GAW, especially for both to be more aware of each other’s activities. -5IGACO Team meeting The second meeting of the Integrated Global Atmospheric Chemistry (IGACO) Theme team took place in Geneva from 16 to 17 April 2002. This Theme is one of four within the Integrated Global Observing Strategy (IGOS) each allowing for the coherent definition and development of an overall global strategy for observing selected fields of interest. In addition to the atmospheric chemistry theme, there is the Global Water Cycle Theme, the Ocean Theme, and the Global Carbon Theme. The objective of IGACO Theme is to ensure long-term continuity and spatial comprehensiveness of atmospheric trace gas and aerosol observations, and to integrate groundbased, in-situ and space-based measurements in a coherent framework easily accessible to a wide range of users. IGACO will therefore support the monitoring of atmospheric composition, and specifically of natural variability and long-term trends, and the measurement of key parameters related to climate change and environmental conditions in support of existing and future international protocols. Additionally, IGACO will address the identification of deficiencies in current observing strategies and the establishment of future measurement systems for the chemical composition of the troposphere and stratosphere. During the meeting the team discussed expanding the “WMO/CEOS Report on a strategy for integrating satellite and ground based observations of ozone”, GAW report No. 140, to include more information on chemical compounds other than ozone. Long term scientific objectives for space observational programmes including ideas and suggestions for new space missions and observational campaigns were also discussed. Retirement of Dr Alexandre Soudine Dr Alexandre Soudine took well-earned retirement as from the end of February, after 18 years of loyal service. We wish to particularly acknowledge his work on atmospheric input of pollutants into the seas/oceans, precipitation chemistry, toxic components and collaboration with EMEP. We are already missing Alexandre's scientific and administrative expertise, not to mention his warm personality and excellent social skills. ENV was fortunate enough to continue to benefit from his valued collaboration through April-May, after which he took up his fishing-rod and flew to Moscow. Our heartfelt thanks go to him for his dedication to his tasks, along with our sincere wishes for a long and healthy retirement in which to enjoy his family and pursue his many interests. Appointment of Dr Len Barrie Dr Len Barrie will take up his position as Chief, Environment Division by the end of June. We welcome him into our team! -6- Planned Meetings for 2002 Global Ozone Monitoring Experiment (GOME) Users meeting, 28-29 January, Frascoti, Italy Second meeting of ESCAP/WMO project Support to the Implementation of the Regional Haze Action Plan of ASEAN Member Countries, 19-21 February, Jakarta, Indonesia WMO Commission on Atmospheric Sciences, 12-20 February, Oslo, Norway UN-ECE Working Group on Environmental Monitoring, 28 February-1 March, Geneva, Switzerland 7th meeting of the GAW Scientific Advisory Group SAG UV, 4-6 March, Davos, Switzerland Workshop on Arctic ozone loss, 4-6 March, Potsdam, Germany Third meeting of Working Group on Wildland Fire of the Inter-Agency Task Force for Disaster Reduction, 9-10 March, Freiburg, Germany 7th EIONET Workshop on Air Quality Management and Assessment, 18-19 March, Geneva, Switzerland 3rd meeting of the EMEP Task Force on Measurements and Modelling (TFMM), 20-22 March, Geneva, Switzerland Fifth meeting of the Ozone Research Managers, 25-27 March, Geneva, Switzerland 2nd meeting of the Vienna Convention Bureau, 28 March, Geneva, Switzerland Second meeting of the Integrated Global Atmospheric Chemistry Observations (IGACO) Team, 16-17 April, Geneva, Switzerland CCQM (Consultative Committee for Amount of Substances) Workshop on Traceability in Chemical Measurements, 16-17 April, Paris, France XXXIInd Session of GESAMP, 6-10 May, London, UK UV Instrument intercomparison and meeting of the Advisory Group of the European Reference Laboratory for UV Measurements, 15-16 May, Ispra, Italy 2002 CMDL Annual Meeting, 21-22 May, Boulder, USA "RIGA 2002" GAW Workshop for the WMO Regional Association VI (Europe), 27-30 May, Riga, Latvia WMO Executive Council, LIVth Session, 11-21 June, Geneva, Switzerland 3rd Training session of GAWTEC, Garmisch-Partenkirchen, Germany 17-28 June, Zugspitze/Hohenpeissenberg and Ozone assessment, 24-28 June, Les Diablerets, Switzerland Third meeting of ESCAP/WMO project Support to the Implementation of the Regional Haze Action Plan of ASEAN Member Countries, August, Singapore XXVth anniversary of the Cape Point station, August, South Africa EMEP Steering Body, 2-4 September, Geneva, Switzerland -7- Ozone SAG meeting, 9-10 September, Toronto, Canada NDSC Steering Committee, 10-13 September, Toronto, Canada Seventh Biennial WMO Brewer Workshop, 16-18 September, Toronto, Canada 10th IAMAS/CACGP Scientific Conference and 7th IGAC Scientific Conference, 18-25 September, Heraklion, Crete, Greece EMEP Workshop on Hemispheric Air Pollution Problems, 7-9 October, Bad Breisig, Germany 4th Training session of GAWTEC, Garmisch-Partenkirchen, Germany 7-18 October, Zugspitze/Hohenpeissenberg and EMEP TFMM meeting on the assessment report, Autumn, Vienna, Austria First Aerosol Calibration Workshop, 21-25 October, Liepzig, Germany 3rd GAW-CH Conference on Ozone, Radiation and Aerosols, 23 October, Zürich, Switzerland 10th SPARC Scientific Steering Group meeting, 18-21 November, Kyoto, Japan GAW Urban Research Meteorology and Environment (GURME) Expert Forecasting Workshop, (date to be determined), Cuernavaca, Mexico Sixth Aerosol SAG Meeting, tentatively December, Davos, Switzerland Executive Body for the LRTAP Convention, 10-13 December, Geneva, Switzerland 2003 4th meeting of the EMEP Task Force on Measurements and Modelling (TFMM), Spring, Valencia, Spain NOTICE: The above list is an informal one and subject to change without notice. Although of interest to GAW, such meetings are not necessarily supported financially by WMO. -8- Environment Division/AREP World Meteorological Organization 7 bis, Avenue de la Paix P.O. Box 2300 CH-1211 Geneva 2 Switzerland Secretariat Staff Alexandre Soudine (AC/ENV) (+41-22) 730.8420 e-mail: soudine_a@gateway.wmo.ch Michael H. Proffitt (+41-22) 730.8235 e-mail: proffitt@wmo.ch Liisa Jalkanen (+41-22) 730.8587 e-mail: Jalkanen_L@gateway.wmo.ch Chantal Renaudot (+41-22) 730.8093 e-mail: renaudot_c@gateway.wmo.ch Margaret Chenevier (+41-22) 730.8451 e-mail: chenevier_m@gateway.wmo.ch Fax number for all of above: +(41-22) 730 8049 -9RECENT GAW PUBLICATIONS Two sets of GAW technical publications are available. One is the general GAW publications with a light purple band and the other is the ozone series with a light blue band. In the future these two series will be merged. Due to the cost of printing and shipping, these reports have only a limited distribution. If you wish a copy of specific reports, please send your request to the Secretariat and they will be forwarded to you. The Secretariat tries to ensure that those who are interested receive the reports. 122 Report of Passive Samplers for Atmospheric Chemistry Measurements and their Role in GAW (prepared by Greg Carmichael) (TD No. 829) 123. Report of WMO Meeting of Experts on GAW Regional Network in RA VI, Budapest, Hungary, 5-9 May 1997 124. Fifth Session of the EC Panel of Experts/CAS Working Group on Environmental Pollution and Atmospheric Chemistry, (Geneva, Switzerland, 7-10 April 1997) (TD No. 898) 125. Instruments to Measure Solar Ultraviolet Radiation (lead author G. Seckmeyer) (TD No. 1066) 126. Guidelines for Site Quality Control of UV Monitoring (lead author A.R. Webb) (TD No. 884) 127. Report of the WMO-WHO Meeting of Experts on Standardization of UV Indices and their Dissemination to the Public (Les Diablerets, Switzerland, 21-24 July 1997) 128. The Fourth Biennial WMO Consultation on Brewer Ozone and UV Spectrophotometer Operation, Calibration and Data Reporting, (Rome, Italy, 22-25 September 1996) (TD No. 918) 129. Guidelines for Atmospheric Trace Gas Data Management (Ken Masarie and Pieter Tans), 1998 (TD No. 907) 130. Jülich Ozone Sonde Intercomparison Experiment (JOSIE, 5 February to 8 March 1996), (H.G.J. Smit and D. Kley) (TD No. 926) 131. WMO Workshop on Regional Transboundary Smoke and Haze in Southeast Asia (Singapore, 2-5 June 1998) (Gregory R. Carmichael). Two volumes 132. Report of the Ninth WMO Meeting of Experts on Carbon Dioxide Concentration and Related Tracer Measurement Techniques (Edited by Roger Francey), (Aspendale, Vic., Australia) 133. Workshop on Advanced Statistical Methods and their Application to Air Quality Data Sets (Helsinki, 14-18 September 1998) (TD No. 956) 134. Guide on Sampling and Analysis Techniques for Chemical Constituents and Physical Properties in Air and Precipitation as Applied at Stations of the Global Atmosphere Watch. Carbon Dioxide (TD 980) 135. Sixth Session of the EC Panel of Experts/CAS Working Group on Environmental Pollution and Atmospheric Chemistry (Zurich, Switzerland, 8-11 March 1999) (TD No. 1002) 136. WMO/EMEP/UNEP Workshop on Modelling of Atmospheric Transport and Deposition of Persistent Organic Pollutants and Heavy Metals (Geneva, Switzerland, 16-19 November 1999) (Volumes I and II) (TD No. 1008) - 10 - 137. WMO RA-II/RA-V GAW Urban Research Meteorology and Environment (GURME) Workshop (Beijing, China, 1-4 November 1999) (TD No. 1014) 138. Reports on WMO International Comparisons of Dobson Spectrophotometers, Part I - Arosa, Switzerland (19-31 July 1999), Part II - Buenos Aires, Argentina (29 Nov.-12 Dec. 1999) and Part III - Pretoria, South Africa (18 March-10 April 2000) (TD No. 1016) 139. The Fifth Biennial WMO Consultation on Brewer Ozone and UV Spectrophotometer Operation, Calibration and Data Reporting (Halkidiki, Greece, September 1998) (TD No. 1019) 140. WMO/CEOS Report on a Strategy for Integrating Satellite and Ground-based Observations of Ozone (TD No. 1046) 141. Report of the LAP/COST/WMO Intercomparison of Erythemal Radiometers (Thessaloniki, Greece, 13-23 September 1999) (WMO TD No. 1051) 142. Strategy for the Implementation of the Global Atmosphere Watch Programme (2001-2007), A Contribution to the Implementation of the Long-Term Plan (WMO TD No. 1077) 143. Global Atmosphere Watch Measurements Guide (WMO TD No. 1073) 144. Report of the Seventh Session of the EC Panel of Experts/CAS Working Group on Environmental Pollution and Atmospheric Chemistry and the GAW 2001 Workshop (Geneva, Switzerland, 2-5 April 2001) (WMO TD No. 1104) WMO GLOBAL OZONE RESEARCH AND MONITORING PROJECT REPORTS (available) No. 31 Atlas of Total Ozone GO3OS Maps for the European Arctic Stratospheric Ozone Experiment (November 1991 - March 1992), (Co-ordinated by R.D. Bojkov and Ch.S. Zerefos) (TD No. 517) No. 32 Report of the Second Meeting of the Ozone Research Managers of the Parties to the Vienna Convention for the Protection of the Ozone Layer (Geneva, 10-12 March 1993) No. 34 Atlas of GO3OS Total Ozone Maps for the Northern Hemisphere Winter-Spring of 1992-1993. (Coordinated by R.D. Bojkov and Ch.S. Zerefos) (TD No. 593) No. 40 Consultation of Experts on Reactive Halogen Compounds and their Possible Effect on Ozone (Hràdec Kralové, Czech Republic, 13-16 November 1995) (TD No. 798) No. 41 Report of the Third Meeting of the Ozone Research Managers of the Parties to the Vienna Convention for the Protection of the Ozone Layer (Geneva, 19-21 March 1996) No. 43 SPARC/IOC/GAW Assessment of Trends in the Vertical Distribution of Ozone (Geneva, May 1998) No. 44 Scientific Assessment of Ozone Depletion - 1998 No. 45 Report of the Fourth Meeting of the Ozone Research Managers of the Parties to the Vienna Convention for the Protection of the Ozone Layer (Geneva, 28-30 April 1999) - 11 LIST OF THE WMO WDCGG PUBLICATIONS DATA REPORTING MANUAL: WDCGG No. 1 January 1991 WMO WDCGG DATA REPORT: (the period of the data accepted) WDCGG No. 2 Part A October 1992 ~ August 1992 WDCGG No. 2 Part B October 1992 ~ August 1992 WDCGG No. 3 October 1993 September 1992 ~ March WDCGG No. 5 March 1994 April WDCGG No. 6 September 1994 September 1993 ~ March WDCGG No. 7 March April 1994 ~ December 1994 WDCGG No. 9 September 1995 January 1995 ~ June WDCGG No. 10 March July 1995 ~ December 1995 WDCGG No. 11 September 1996 January 1996 ~ June WDCGG No. 12 March July 1996 ~ November 1996 WDCGG No. 14 September 1997 December 1996 ~ June WDCGG No. 16 March July 1997 ~ December 1997 WDCGG No. 17 September 1998 January 1998 ~ June WDCGG No. 18 March July 1998 ~ December 1998 WDCGG No. 20 September 1999 January 1999 ~ June WDCGG No. 21 March July 1999 ~ December 1999 WDCGG No. 23 September 2000 January 2000 ~ June WDCGG No. 25 March July 2000 ~ December 2000 1995 1996 1997 1998 1999 2000 2001 WMO WDCGG DATA CATALOGUE: WDCGG No. 4 December 1993 WDCGG No. 13 March 1997 WDCGG No. 19 March 1999 WDCGG No. 24 March 2001 WMO WDCGG DATA SUMMARY: WDCGG No. 8 October 1995 WDCGG No. 15 March 1998 WDCGG No. 22 March 2000 1993 1993 ~ September 1993 1994 1995 1996 1997 1998 1999 2000 - 12 - WMO WDCGG CD-ROM: (the period of the data accepted) CD-ROM No. 1 March 1995 October 1990 ~ December 1994 CD-ROM No. 2 March 1996 October 1990 ~ June 1995 CD-ROM No. 3 March 1997 October 1990 ~ June 1996 CD-ROM No. 4 March 1998 October 1990 ~ December 1997 CD-ROM No. 5 March 1999 October 1990 ~ December 1998 CD-ROM No. 6 March 2000 October 1990 ~ December 1999 CD-ROM No. 7 March 2001 October 1990 ~ December 2000 CD-ROM No. 8 March 2002 October 1990 ~ January 2002