Atmospheric Chemistry and Physics Discussions
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10.5194/acpd-8-1549-2008
http://www.atmos-chem-phys-discuss.net/8/1549/2008/
http://www.atmos-chem-phys-discuss.net/8/1549/2008/acpd-8-1549-2008.html
http://www.atmos-chem-phys-discuss.net/8/1549/2008/acpd-8-1549-2008.pdf
1549
1588
2008-01-29
A framework for comparing remotely sensed and in-situ CO<sub>2</sub> concentrations
R. Macatangay
macatang@iup.physik.uni-bremen.de
T. Warneke
C. Gerbig
S. Körner
R. Ahmadov
M. Heimann
J. Notholt
Institute of Environmental Physics, University of Bremen, Bremen, Germany
Max Planck Institute for Biogeochemistry, Jena, Germany
A framework that allows validating CO<sub>2</sub> column averaged volume mixing
ratios (VMRs) retrieved from ground-based solar absorption measurements
using Fourier transform infrared spectrometry (FTS) against measurements
made in-situ (such as from aircrafts and tall towers) has been developed.
Since in-situ measurements are done frequently and at high accuracy on the
global calibration scale, linking this scale with FTS total column
retrievals ultimately provides a calibration scale for remote sensing. FTS,
tower and aircraft data were analyzed from measurements during the
CarboEurope Regional Experiment Strategy (CERES) from May to June 2005 in
Biscarrosse, France. Carbon dioxide VMRs from the MetAir Dimona aircraft,
the TM3 global transport model and Observations of the Middle Stratosphere
(OMS) balloon based experiments were combined and integrated to compare with
FTS measurements. The comparison agrees fairly well with differences
resulting from the spatial variability of CO<sub>2</sub> around the FTS as
measured by the aircraft. Additionally, the Stochastic Time Inverted
Lagrangian Transport (STILT) model served as a "transfer standard" between
the in-situ data measured at a co-located tower and the remotely sensed data
from the FTS. The variability of carbon dioxide VMRs was modeled well by
STILT with differences coming partly from uncertainties in the spatial
variation of carbon dioxide.
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