 |
| Titel |
Analysis of column-averaged carbon dioxide and methane concentrations simulated by NIES TM |
| VerfasserIn |
D. A. Belikov, S. Maksyutov, S. Aoki, N. M. Deutscher, S. Dohe, D. Griffith, E. Kyrö, I. Morino, T. Nakazawa, J. Notholt, M. Rettinger, M. Schneider, V. Sherlock, R. Sussmann, G. C. Toon, P. O. Wennberg, D. Wunch |
| Konferenz |
EGU General Assembly 2012
|
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 14 (2012) |
| Datensatznummer |
250064597
|
|
|
|
|
|
| Zusammenfassung |
| We performed multi-annual simulations of CO2 and CH4 using the National Institute for
Environmental Studies (NIES) three-dimensional offline chemical transport model (version
NIES-08.1i), driven by JRA-25/JCDAS reanalysis data. This version uses a flexible hybrid
sigma–isentropic (Ïă–θ) vertical coordinate consisting of terrain-following and isentropic
levels switched smoothly near the tropopause. Vertical transport in the isentropic part of the
grid in the stratosphere was controlled by an air-ascending rate derived from the effective
heating rate from JRA-25/JCDAS reanalysis, and was adjusted to fit the observed age of air in
the stratosphere.
The model was validated against balloon-borne observations in the stratosphere,
aircraft observations in the free-troposphere and continuous surface measurements at
GLOBALVIEW sites.
Convolved with scene-dependent instrument averaging kernels, dry-air column-averaged
mole fractions of CO2 (XCO2) and CH4 (XCH4) were calculated from NIES TM tracer
distributions and were compared with measurements acquired at the Total Carbon Column
Observing Network (TCCON) ground-based high-resolution Fourier Transform
Spectrometer (FTS) sites (Bialystok, Bremen, Darwin, Garmisch, Izaña, Lamont,
Lauder, Orleans, Park Falls, Sodankylä, Tsukuba, and Wollongong) for the period
from January 2009 to January 2011. The model was able to reproduce the seasonal
and inter-annual variability of XCO2 and XCH4 with correlation coefficients of
0.8–0.9 and 0.4–0.8, respectively. A comparison of modeled data and TCCON
observations revealed that the model biases are generally in the range of ±0.2%
for XCO2 and ±0.5% for XCH4 excluding Sodankylä, where strong biases are
found. Thus, the performance of the current model version is sufficient for use in
evaluating satellite retrieval algorithms in areas not covered by ground-based FTS sites. |
|
|
|
|
|
|