seasonal variability of stratospheric methane: implications for constraining tropospheric methane budgets using total column observations
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ID: 235334
2016
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Abstract
Global and regional methane budgets are markedly uncertain.
Conventionally, estimates of methane sources are derived by bridging
emissions inventories with atmospheric observations employing chemical
transport models. The accuracy of this approach requires correctly simulating
advection and chemical loss such that modeled methane concentrations scale
with surface fluxes. When total column measurements are assimilated into this
framework, modeled stratospheric methane introduces additional potential for
error. To evaluate the impact of such errors, we compare Total Carbon Column
Observing Network (TCCON) and GEOS-Chem total and tropospheric
column-averaged dry-air mole fractions of methane. We find that the model's
stratospheric contribution to the total column is insensitive to
perturbations to the seasonality or distribution of tropospheric
emissions or loss. In the Northern Hemisphere, we identify disagreement
between the measured and modeled stratospheric contribution, which increases
as the tropopause altitude decreases, and a temporal phase lag in the model's
tropospheric seasonality driven by transport errors. Within the context of
GEOS-Chem, we find that the errors in tropospheric advection partially
compensate for the stratospheric methane errors, masking inconsistencies
between the modeled and measured tropospheric methane. These
seasonally varying errors alias into source attributions resulting from model
inversions. In particular, we suggest that the tropospheric phase lag error
leads to large misdiagnoses of wetland emissions in the high latitudes of the
Northern Hemisphere.
| Reference Key |
saad2016atmosphericseasonal
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|---|---|
| Authors | ;K. M. Saad;D. Wunch;D. Wunch;N. M. Deutscher;N. M. Deutscher;D. W. T. Griffith;F. Hase;M. De Mazière;J. Notholt;D. F. Pollard;C. M. Roehl;M. Schneider;R. Sussmann;T. Warneke;P. O. Wennberg |
| Journal | Journal of agricultural and food chemistry |
| Year | 2016 |
| DOI |
10.5194/acp-16-14003-2016
|
| URL | |
| Keywords |
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