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What is GEWEX?

GEWEX is a core component of the World Climate Research Programme WCRP, dedicated to surface-atmosphere interactions. His Scientific Steering Group (SSG) meets once a year and the 29th edition took place in Souther most part of China, in the island of Sanya between 5th and 10th of February 2017 (SSG-29). GEWEX is one of the 4 Science panels active within WCRP organisation (together with CLiC, CLIVAR, SPARC) and works in cooperation with 4 International Working groups (WGCM, WGRC, WGSIP, WGNE) and in cross-coordination with the World Weather Research Programme WWRP. GEWEX co-chairs are Graeme Stephens (JPL) and Sonia Seneviratne (ETH) and the 2017  

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GEWEX  SSG-panel counts  counts on 11 10-members.

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The meeting agenda for the the SSG-29 can be found here:

http://www.gewexevents.org/gewex-ssg-29/agenda/

The GEWEX SSG-29 had review one year of science and development for the 4 expert panels: 

• GEWEX Hydroclimatology Panel (GHP)
• Global Land/Atmosphere System Study (GLASS)
• GEWEX Atmospheric Boundary Layer Study (GABLS)
• GEWEX Data and Assessments Panel (GDAP)

The highlights from perspectives of potential interests at ECMWF are reported with reference to the 4 expert panels.

What is the focus of GEWEX activity?

GHP is looking after regional water cycle experiments involving dedicated campaigns and special observing periods. The ongoing work and perspectives for this panel is summarized in this figure with list of regional projects experiments:

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This panel is coordinating efforts like HYMEX over the Mediterranean basin and have been delivering an impressive amount of research, to which ECMWF has contributed with ERA-Interim meteorological forcing. Promising experiments include Baltic-Earth (a follow-up to BALTEX) and PannEx (strongly supported by the Croatian NMHS and focusing on the Pannonian plains, see a presentation here).

GASS also known with its previous name of GABLS (a series of experiments with SCM and instrumented towers' data) is the panel looking into the atmospheric processes related to water and energy cycle. Graeme Stephens is very active in animating and organizing the activities around process-understanding research. Noteworthy are the PROES (Process Evaluation Study, see a presentation here) activity and Intense Precipitation research.

GLASS is looking into Land–Atmosphere system and is the panel I knew better as former member and contributor (2010-2015). The research action includes project such as GSWP2 (that inspired EartH2Observe). Noteworthy the GSWP3 updates (finalisation of forcing), and the post-GLACE experiments for which a collaboration with Sonia Seneviratne is under discussion.

GDAP is looking into dataset evaluation and assessment. The well known dataset evaluated as coordinated activities are: the GEWEX Data and Assessments Panel consist of Clouds (ISCCP); Precipitation (GPCP); Aerosols (GACP); Ocean Sensible and Latent Heat Flux (SeaFlux); Land sensible and latent Heat Flux (LandFlux) and Surface as well as TOA radiative fluxes (SRB). In addition, GEWEX is coordinating an assessment of temperature and Water Vapor products to support the above product list (GVAP).

GEWEX is proving very efficient in reaching out to a large amount of the Atmospheric and Climate Science community, often reaching a consensus view on priorities of development. It provides Scientific inspiration (e.g. see WRCP-GCs) and often acts as a label for both Earth system process-understanding (via its coordinated experiments) and for Scientific-data assessment (via expert reviews). Those two streams are strengths of the panel that can provide science support for (an increasingly) seamless monitoring and prediction linking to the Services under the umbrella of the WMO and within collaboration of Satellite and Research agencies.

 The SSG panels to which I have participated are described in the links below: