PROGRAM TITLE: 	Clouds, Energy and Water (GEWEX)
ACTIVITY STREAM:  	Process Research
SCIENCE ELEMENT:  	Climate and Hydrological Systems

DEPARTMENT OF COMMERCE
NATIONAL OCEANIC AND ATMOSPHERIC ADMINISTRATION

DESCRIPTION:  Two of the highest scientific priorities in the USGCRP in 
determining the nature and variability of the Earth's climate system involve 
understanding the nature of land-atmosphere-ocean water and energy 
interactions, and the role of clouds. This program encompasses NOAA's 
primary contribution to the Global Energy and Water Cycle Experiment 
(GEWEX) of the World Climate Research Program (WCRP), and to related 
projects of the International Geosphere Biosphere Program (IGBP). The 
principle thrusts are directed at:

--	atmosphere-land surface interactions
--	distribution of atmospheric water vapor
--	cloud processes, and
--	radiative impacts of anthropogenic aerosols

Support within each of these thrusts is given to special observing programs, 
to process and diagnostic studies, and to the development of parameterization 
techniques that improve the representation of subgrid-scale processes in 
climate models.  Many of these processes operate on very short time-scales, 
however, our ability to represent them explicitly or implicitly in climate 
models is critical to successful prediction of climate change on seasonal to 
decadal and longer time-scales.  The mechanisms through which NOAA will 
implement this program involve promotion and participation in:

--	the GEWEX Continental-scale International Project (GCIP), including 
the role of Lead Agency and sponsorship of the project office;
--	the Global Water Vapor Project (GVaP);
--	the International Satellite Cloud Climatology Project (ISCCP) and the 
GEWEX Cloud System Study (GCSS) Project, 
	aerosol climatology and characterization projects of IGBP, and
--	the emerging CLIVAR/GOALS project on large-scale influences on 
seasonal to interannual variability of North American precipitation.

STAKEHOLDERS:  NOAA will work closely with those USGCRP partners 
also contributing directly and indirectly to the activities of GEWEX and IGBP, 
including NASA, DOE, USGS, USDA and NSF.  NOAA will also continue to 
play an active role in national and international planning mechanisms for 
GEWEX and related programs through its involvement in and support for 
National Academy, WCRP and IGBP scientific committees and working 
groups.  Particular attention will be given to coordinating studies planned for 
the continental United States with related programs in Canada and the 
countries of Central and South America.

SHORT-TERM POLICY PAYOFFS:  Enhancing measurements of key climate 
parameters over the Mississippi River Basin and adjacent areas, coupled with 
work already in process on improving subgrid-scale parameterizations, will 
lead to a better understanding of the complex hydroclimatology of the Basin.  
The incorporation of improvements deriving from this increased 
understanding into predictive models of the climate system will enable 
greater specificity in seasonal to interannual predictions of regional climate 
variability.

Further, knowledge gained on water and energy processes over the data rich 
regions of the continental United States can be applied to regions of the 
earth's surface less well monitored by in situ  observing systems; this is the 
primary rationale behind GCIP.  Concurrent advancements in global remote 
sensing capabilities will lead to improved global models, and to greater 
confidence in assessments of the regional impacts of global change.

PROGRAM CONTACT:  Michael Coughlan, Office of Global Programs, 1100 
Wayne Avenue, Suite 1225, Silver Spring, MD 20910 (301) 427-2089 X40.