World Meteorological Organization Working together in weather, climate and water WMO OMM WMO Introduction: Need for OSCAR in WIGOS and the RRR Wenjian Zhang, D/OBS World Meteorological Organization (WMO) 17th World Meteorological Congress Side Event on OSCAR

WMO OMM Need an Integrated Global Observing System to meet all requirements in a cost – effective manner WIGOS = WMO INTEGRATED GLOBAL OBSERVING SYSTEM The whole is more than the sum of the parts—Aristotle 17th World Meteorological Congress: Side Event on OSCAR

WMO OMM Rolling Review of Requirements (RRR) process RRR process, defined by the Manual on the Global Observing System (WMO-No. 544), is the WMO standard process for managing evolution of WMO observing systems.. 3

Observing capabilities (space & surface) Need for OSCAR supporting RRR and Vision of WIGOS 2040 Requirements Long-term vision of WIGOS Members’ programmes (including space agencies) Implementation Plan for Evolution Recommendations Statements of guidance Statements of Guidance Critical review 1. User requirements are collated in a comprehensive, systematic and quantitative way in the WMO Observing Requirements databaseWMO Observing Requirements database 2. The comparison of user requirements with observing system capabilities for a given application area is called a Critical Review. 3. The output of this is reviewed by experts in the relevant application and used to prepare a Statement of Guidance (SOG) 4. The consolidation of the SoGs (with gap analysis for all areas and future needs and potential new technologies) will lead to a long-term vision for WIGOS

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