The State-of-the-Global Water System:

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1 The State-of-the-Global Water System: Moving toward an Operational View of World Water Resources Charles J. Vörösmarty, Balázs Fekete, Pamela Green, Richard Lammers, and Alex Prusevitch Spring AGU: Union Session U44A Ft. Lauderdale, FL 28 May 2008

2 Contributions from Earth System Science In situ networks Operational satellite-based monitoring of the hydrosphere Simulation models and data analysis tools (NWP-4DDA, GCMs, RCMs, ESMs) ) creating new opportunties to view the global water crisis to inform policy and improve management

3 Humans Interacting w/ the Global Water Cycle-- The Picture Today 84% 16% of population Driest half Wettest half Vörösmarty et al. (2005), Millennium Assessment, Conditions & TrendsWorking Group The Social Geophysical Science High resolution Data Picture mapping shows ca. 20% population w/ no access to renewable water supply Importance of upstream source areas: note Amazon/S. Asian contrast Notion of tradeoffs w/in basin

4 The Global Water System: Inter-Disciplinary Perspectives are Essential Central tenet Humans now a key determinant of the state and trajectory of the global water cycle PHYSICAL COMPONENTS e.g. moisture transport, precipitation, river discharge, water storage WATER CYCLING BIOLOGICAL & BIOGEOCHEMICAL COMPONENTS e.g. species richness, habitat quality, water quality HUMAN COMPONENTS e.g. via water related institutions, water engineering, water use in several sectors ESSP

5 Mid-Phase Strategy Expert Groups for the GWSP Integrative Study Areas Conceptual Model of the GWS Integrative Study Areas Spe ecial Interes sts Clim mate change Gov vernance & Adapta ation Strateg gies 1. Global Scale Initiative 2. Global Catchment Initiative 3. Global Water Needs Initiative ling Simula ation model Ob bservation s Meth hods & Tool Scientific & Policy Relevant Results Current state Manifested & projected changes Thresholds, abrupt changes, tipping i points Policy, Outreach & Capacity Building

6 Integrated Approaches to Global Water Resource Assessment and Global Change Studies Links Geophysics of Water, Governance, Vulnerability, Supply Limitations Imposed by Pollution & Ecosystem Flow Requirements

7 THE OVERARCHING GOAL OF GSI: State-of-the-Global t f th b l Water System Application 1: The Definitive ESS-based Global Water Resource Assessment Application 2: GWS Change and Its Significance Powered by GWSP Data Sets, Models, Thematic Activities Outside Affiliates and Demands of the Users

8 Precipitation WATER RESOURCE MODULE Discharge= Basin & Inter-basin Resource Evapo- transpiration Lateral Transport Digital River Networks Runoff (mm/d) Ipswich R. Runoff Validation Runoff (mm/d) predicted 10 observed /1/93 7/20/93 2/5/94 8/24/94 3/12/95 9/28/95 Date Cal/Val Managed Water ETirr Runoff= Local Water Resource

9 GTN-H Provides Rich Set of Information Streams for Many Applications Soil moisture In-situ Soil Moisture Network (planned); SMOS Ground water* IGRAC Lake level/area* HYDROLARE / GTN-L Water vapour* WMO WWW Water quality / BGC fluxes GEMS/Water Water use* FAO/AQUASTAT Global Terrestrial Network Hydrology (GTN-H) "Network of Networks" River discharge* GRDC / GTN-R Isotopic Composition IAEA / GNIP Evapotranspiration FLUXNET Snow cover* Glaciers and ice caps* NSIDC WGMS / GTN-G Precipitation* GPCC GPCP NCDC / GSN

10 Themed Approach eg e.g. Hydrologic Extremes (flood & drought) Monitoring and Assessment Soil moisture In-situ Soil Moisture Network (planned); SMOS Ground water* IGRAC Lake level/area* HYDROLARE / GTN-L Water vapour* WMO WWW Water quality / BGC fluxes GEMS/Water Water use* FAO/AQUASTAT Global Terrestrial Network Hydrology (GTN-H) "Network of Networks" River discharge* GRDC / GTN-R Isotopic Composition IAEA / GNIP Evapotranspiration FLUXNET Snow cover* Glaciers and ice caps* NSIDC WGMS / GTN-G Precipitation* GPCC GPCP NCDC / GSN

11 State-of-the-Global Water System: Operationalizing Water Resource Assessment for Timely Assessment GEOSS-class Geophysical data Derived Products Geospatial (e.g. hazard exposure) Socio-economics Drought exposure: 5-month running means Exposure in B person-days

12 Three Points of Engagement GWSP Global Scale Initiative GTN-H and Its Coordination (in conjunction with WMO and GCOS) World Water Assessment Programme

13

14 We gratefully acknowledge the financial and in-kind support of: NASA Terrestrial Hydrology and Applied Sciences Programs NOAA National Ocean Service Global Water System Project / ICSU World Meteorological Organization / Hydrology & Water Resources Department UN World Water Assessment Program UN Environment Program

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