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An Adjoint-Based Analysis of the Sampling Footprints of Tall Tower, Aircraft and Potential Future Lidar Observations of CO2A detailed mechanistic understanding of the sources and sinks of CO2 will be required to reliably predict future CO2 levels and climate. A commonly used technique for deriving information about CO2 exchange with surface reservoirs is to solve an 'inverse problem', where CO2 observations are used with an atmospheric transport model to find the optimal distribution of sources and sinks. Synthesis inversion methods are powerful tools for addressing this question, but the results are disturbingly sensitive to the details of the calculation. Studies done using different atmospheric transport models and combinations of surface station data have produced substantially different distributions of surface fluxes. Adjoint methods are now being developed that will more effectively incorporate diverse datasets in estimates of surface fluxes of CO2. In an adjoint framework, it will be possible to combine CO2 concentration data from longterm surface and aircraft monitoring stations with data from intensive field campaigns and with proposed future satellite observations. We have recently developed an adjoint for the GSFC 3-D Parameterized Chemistry and Transport Model (PCTM). Here, we will present results from a PCTM Adjoint study comparing the sampling footprints of tall tower, aircraft and potential future lidar observations of CO2. The vertical resolution and extent of the profiles and the observation frequency will be considered for several sites in North America.
Document ID
20040074255
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
Authors
Andrews, Arlyn
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Kawa, Randy
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Zhu, Zhengxin
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Burris, John
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Abshire, Jim
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
August 21, 2013
Publication Date
January 1, 2004
Subject Category
Environment Pollution
Meeting Information
Meeting: Fall AGU 2003
Location: San Fransico, CA
Country: United States
Start Date: December 8, 2003
End Date: December 12, 2003
Sponsors: American Geophysical Union
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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