PROGRAM TITLE: 	Earth System Modeling and Global Analysis 
Program
ACTIVITY STREAMS: 	Integrative Modeling & Prediction, 
Assessment
SCIENCE ELEMENT: 	Climate and Hydrologic Systems
				Biogeochemical Dynamics
				Ecological Systems & Dynamics
				Data & Information Management

NATIONAL AERONAUTICS AND SPACE ADMINISTRATION

SCIENTIFIC MERIT:  The Earth System Modeling and Global Analysis 
Program will help Earth system scientists understand and predict 
global change by promoting, coordinating, and financially supporting 
the development of global-scale models and numerical tools for 
diagnosing and predicting natural and man-made global 
environmental change. Specific responsibilities cover the atmosphere, 
oceans, cryosphere, land-surface, and biosphere on spatial scales 
ranging from supra-regional (e.g. ocean basin, major drainage basin, 
and/or continental) through global, and include temporal scales from 
seasons through decades to centuries.  This modeling capability along 
with data from other sources will be used to help understand how 
the Earth's interactive system functions, and to simulate and reliably 
predict the consequences of stressing the global environment. The 
Program is responsible for planning, implementing, and managing a 
broad based research program which will contribute to an improved 
understanding of the earth's fully coupled physical, chemical and 
biological climate system, its interactions, and predictability through 
the multidisciplinary exploitation of space-based, airborne, and 
ground-based observations, numerical modeling, and climate impact 
assessment and sensitivity studies. The Program incorporates the 
following elements: (1) global model development and integration; 
(2) global data assimilation and analysis; and (3) climate diagnostics, 
sensitivity studies, and impact assessment. Each element provides a 
focus for conducting interdisciplinary research which addresses the 
overall science objectives of the US Global Change Research Program 
(GCRP) and, in particular, those which involve the Earth Observing  
System (EOS). Particular attention is placed on the scientific problems 
related to global warming and ozone depletion. The Program is 
organized into five component programs with the following goals:
	
The goals of the Global Atmospheric Modeling and Analysis Program 
are to develop global-scale models of the atmospheric climate, to 
interactively couple such models with other component models of the 
Earth system, to develop model-driven data assimilation systems 
that produce research quality climatic datasets, and to use both 
models and datasets to assess global climate variability and trends 
that affect the Earth system. 

The goals of the Oceans and Ice Modeling and Analysis Program are 
to promote the development and application of coupled Earth system 
models which assimilate satellite and other data to produce 
internally consistent, comprehensive ocean and sea ice data sets on 
supra-regional to global scales. The end result of this research is the 
production of geophysical,  chemical, and biological data fields for 
model testing and validation, as well as for generalized analysis of 
earth system variability and trends.  The goals of the Atmospheric 
Chemistry Modeling and Analysis Program are to promote the 
development, validation, and application of regional to global scale 
computational models representing the chemical state of the Earth's 
troposphere and stratosphere and to study the chemical distribution 
of the Earth's troposphere and stratosphere using spatially and/or 
temporally extended data sets in the context of multidimensional 
numerical models.  A particular emphasis of the program is the way 
in which meteorological processes affect the trace constituent 
composition of the troposphere and stratosphere. 

The goals of the Land/Biosphere Modeling and Analysis Program are 
to promote the development, validation, and application of regional 
to global scale computational models representing land surface and 
biospheric processes and their interactions with the dynamic 
atmosphere, along with the development of parameterized 
representations of these processes for use in coupled Earth system 
models. 

The goals of the Global Change Data Analysis Program are to promote 
the development and validation of  retrospective and current global 
data sets for use in specifying initial conditions and boundary 
conditions for global change model experiments, sensitivity studies 
and climate impact assessments, and to provide information for 
model validation in the context of specified global change 
scenarios.This includes the development of software and systems for 
visualization of global data derived from satellite remote sensing and 
model output. The program also supports the coordination of national 
and international inter-sensor and inter-satellite calibration 
activities to insure the quality of the global data.

STAKEHOLDERS:  Overall activities are guided by the planning and 
coordination of the interagency Committee on Earth and 
Environmental Sciences (CEES) and the Working Group on Global 
Change Research.  In addition, the program is coordinated with 
various other committees which work to define the elements of the 
U.S. Global Change Research Program (e.g., the National Research 
Council's Board on Atmospheric Sciences and Climate and it 
subordinate panels).  On the international level, the program 
activities are closely coupled with the projects coordinated by the 
World Climate Research Programme (WCRP) and the International 
Geosphere Biosphere Programme (IGBP), such as WOCE, TOGA/COARE, 
and GEWEX. The Program also sponsors NASA participation in the 
periodic IPCC climate impact and WMO ozone assessments.

POLICY RELEVANCE: 	
Primary  	-- Climate Change and Global Warming
		-- Stratospheric Ozone and UV-B Radiation

Secondary 	-- Ecological Change & Biodiversity
		-- Seasonal and Interannual Prediction

PROGRAM CONTACT:	Robert A. Schiffer
				Office of Mission to Planet Earth
				NASA Headquarters, Code YS
				Washington, DC 20546
				tel: 202-358-0258
				fax: 202-358-2770
				E-mail: R.SCHIFFER/ omnet