Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2016-720
© Author(s) 2016. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
07 Oct 2016
Review status
A revision of this discussion paper was accepted for the journal Atmospheric Chemistry and Physics (ACP) and is expected to appear here in due course.
Lower-tropospheric CO2 from near-infrared ACOS-GOSAT observations
Susan S. Kulawik1, Chris O'Dell2, Vivienne H. Payne3, Le Kuai4, Helen M. Worden5, Sebastien C. Biraud6, Colm Sweeney7, Britton Stephens7, Laura T. Iraci8, Emma L. Yates1, and Tomoaki Tanaka8 1Bay Area Environmental Research Institute, Sonoma, CA, USA
2Cooperative Institute for Research in the Atmosphere, Colorado State University, Fort Collins, CO, USA
3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA
4UCLA Joint Institute for Regional Earth System Science and Engineering (JIFRESSE), Los Angeles, CA, USA
5Atmospheric Chemistry Observations & Modeling (ACOM) Laboratory National Center for Atmospheric Research, Boulder CO 80307 USA
6Lawrence Berkeley National Laboratory, Earth Science Division, Berkeley, CA, USA
7NOAA/ESRL/GMD, Boulder, CO, USA
8NASA Ames, Moffett Field, CA, USA
Abstract. We present two new products from near-infrared GOSAT observations: lower tropospheric (LMT, from 0–2.5 km) and upper tropospheric/stratospheric (U, above 2.5 km) carbon dioxide partial columns. We compare these new products to aircraft profiles and remote surface flask measurements and find that the seasonal and year-to-year variations in the new partial columns significantly improve over the ACOS-GOSAT initial guess/a priori, with distinct patterns in the LMT and U seasonal cycles which match validation data. For land monthly averages, we find errors of 1.9, 0.7, and 0.8 ppm for retrieved GOSAT LMT, U, and XCO2; for ocean monthly averages, we find errors of 0.7, 0.5, and 0.5 ppm for retrieved GOSAT LMT, U, and XCO2. In the southern hemisphere biomass burning season, the new partial columns show similar patterns to MODIS fire maps and MOPITT multispectral CO for both vertical levels, despite a flat ACOS-GOSAT prior, and CO/CO2 emission factor consistent with published values. The difference of LMT and U, useful for evaluation of model transport error, has also been validated with monthly average error of 0.8 (1.4) ppm for ocean (land). The new LMT partial column is more locally influenced than the U partial column, meaning that local fluxes can now be separated from CO2 transported from far away.

Citation: Kulawik, S. S., O'Dell, C., Payne, V. H., Kuai, L., Worden, H. M., Biraud, S. C., Sweeney, C., Stephens, B., Iraci, L. T., Yates, E. L., and Tanaka, T.: Lower-tropospheric CO2 from near-infrared ACOS-GOSAT observations, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2016-720, in review, 2016.
Susan S. Kulawik et al.
Susan S. Kulawik et al.

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Short summary
We introduce new vertically resolved GOSAT products which separate local versus remotely influenced CO2. Current GOSAT column results for CO2 (XCO2) are sensitive to fluxes on continental scales, whereas flux estimates from surface and tower measurements are affected by sampling bias and model transport uncertainty. These new GOSAT measurements of boundary layer CO2 are validated against aircraft and surface observations of CO2, and compared to vertically resolved MOPITT CO.
We introduce new vertically resolved GOSAT products which separate local versus remotely...
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