Activities of the International Soil Moisture Working Group Peter J. van Oevelen International GEWEX Project Office GEWEX@GEWEX.ORG
Framework • International Soil Moisture Working Group • GEWEX • CEOP • Hydrological Applications Project • GRP • LandFlux • Space Agencies • ESA • NASA • JAXA
Rationale for in-situ network • There is no current global network • Soil Moisture is regarded as (emerging) key variable by GCOS and considered to be important in land surface feed backs • Temporal change is as or even more important than spatial representation • Modelling implementation and Data Assimilation • Earth Observation Validation/calibration • EO does not give profile information (exception multi-band SAR) • Increased Process Understanding • Needed for Hydrological Applications
International Soil Moisture Working Group • 2005: Started under the IGOS-P IGWCO (Integrated Global Observing Strategy – Partnership /Integrated Global Water Cycle Observations theme) • March 2006: First Workshop/Meeting, The Netherlands • November 2007: Second Workshop/Meeting, China
Original ISMWG Objectives • To support international cooperation in research and applications in support of soil moisture satellite missions; • To support the development of an in-situ global soil moisture network; • To protect satellite missions dealing with soil moisture observations.
Participation and Needs • Global participation: identify key people and organizations worldwide; • Leadership from established programs (in-situ and satellite); • Definition of achievable goals (in-situ networks, satellite products); • Identify resources to enhance in-situ expansion and contributions to satellite/model validation.
ISMWG Commitments • Commits to a global network of in-situ soil moisture measurements • Lead international agency: GEWEX • Workshops (Bring together key people, establish goals, current activities, standards) • Noordwijk, ESTEC March 2006: Done • Beijing, IAP, November 2007: Done • Resources for enhancing unrepresented regions: • Key area unresolved • Data archival and distribution: • Current Lead: Portuguese Institute of Meteorology
ISMWG Commitments II • Commits to developing a quasi-operational soil moisture data product • Quality and relevance of current products: tbd • International support for planned dedicated missions may require commitment by missions to provide a timely product: GEO
Second ISMWG Workshop • Held on November 14 and 15, 2007 at LASG, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing, China • 22 Registered Participants and 15 Students and Post-Docs • ~20 Presentations
Why this workshop in 2007? • Build upon First Workshop and increase coordination • Review individual activities • Identify best practices • Set goals for observing system integration • Role of in-situ in satellite product validation-specific design standards • How do we affect changes to existing protocols, expand (especially developing regions of the world), affiliate with a group with $$? • Identify the next steps • Report….GEWEX News? • Initiate Set-up of the Data Hosting Center
In-Situ Measurement Protocol • Uniformity • Representative • Consistency • (Cross-)Calibration/Validation • Site specific calibration: absolutely • Temperature: pref. At each depth and for each sensor • Soil Texture & Bulkdensity: needed • Relationship with gravimetric soil moisture is standard • Careful automation • Quality Assurance
In-Situ Measurement Protocol (2) • Density/depth/number of sensors • 5, 20 and 50 cm below surface • Units of representation • Volumetric or fractional between 0 and 1 • Soil Moisture Definition • Soil texture description & soil hydraulic properties • Which metadata?
Network Design • Density • Continuity • Data delivery/in-take, distribution & archiving (see next) • Metadata (see next) • Capacity Building • Training • Involvement LDC's • Linking Existing Networks (see next)
Data Hosting • Data delivery/in-take, distribution & archiving • Metadata • Linking Existing Networks • ESA to support data hosting activity within framework of SMOS Cal/Val activities
ISMWG Meeting 2007 • As with the first meeting Spirit was very cooperative! • Openness and willingness to different views and opinions • Deemed very useful and worth keeping the momentum
Topics for Consideration • How to stimulate contribution of data to data hosting center? • Rationale, all the reasons there are to not sit on your data but share… • How and who will get access to what? • A team is needed to start looking at instruments (intercomparison etc.) • Support for data hosting continuation (SMOS and beyond) • What else do we NEED to do?
Past Critical Issues • Data from outside of North-America and Europe • Loss of momentum with delay of SMOS launch • Separation of communities (both US vs Europe as well as agricultural vs hydrological) • Links to GEO and GEOSS (currently one of the water subtasks)
ISMWG Future • The Proposed New Structure and Embedding within GEWEX • The embedding of the ISMWG in the GEWEX Radiation Panel (GRP) requires a few changes in the so far loose structure. Proposed is a three tier system which is guided by a board consisting of the (co-)chairs of each of the tiers plus ex-officio members. • Consistent with other GRP activities
Tier 1: Validation: • Development of Global In-Situ Soil Moisture network and data sets to support validation of satellite soil moisture retrieval and assimilation • Data Hosting, Measurement Protocols • Validation of Satellite Soil Moisture Products and Soil Moisture Intercomparison Projects • Links all three tiers
Tier 2: Assimilation • The assimilation of soil moisture and satellite data (both active and passive ) into numerical weather prediction and hydrological modeling for both forecasting as well as process studies. • Important to show usefulness • Expand to yield forecasting
Tier 3: Product fusion and merging • Development of long term consistent global soil moisture products (and their derivatives) • Combining various sources of data (PM, AM, In-Situ) • Climate/Trend research robust
Key Activities 2009 • ISMWG Custodian Soil Moisture Network in GTN-H • Workshops: Next (3rd)Workshop, Lisboa, Portugal (March 10, 11 2009) • Website: http://gewex.org/ismwg_3rdmeeting.html • Data Hosting Center kick-off • Link/interact/alignment with other relevant activities such as by NOAA