Averaging kernels for DOAS total-column satellite retrievals
By H. Eskes, K. F. Boersma. 2003
333 citations recorded by the source corpus.
Abstract. The Differential Optical Absorption Spectroscopy (DOAS) method is used extensively to retrieve total column amounts of trace gases based on UV-visible measurements of satellite spectrometers, such as ERS-2 GOME. In practice the sensitivity of the instrument to the tracer density is strongly height dependent, especially in the troposphere. The resulting tracer profile dependence may introduce large systematic errors in the retrieved columns that are difficult to quantify without proper additional information, as provided by the averaging kernel (AK). In this paper we discuss the DOAS retrieval method in the context of the general retrieval theory as developed by Rodgers. An expression is derived for the DOAS AK for optically thin absorbers. It is shown that the comparison with 3D chemistry-transport models and independent profile measurements, based on averaging kernels, is no longer influenced by errors resulting from a priori profile assumptions. The availability of averaging kernel information as part of the total column retrieval product is important for the interpretation of the observations, and for applications like chemical data assimilation and detailed satellite validation studies.
Subfields: Atmospheric Science, Spectroscopy
View Paper: https://www.semanticscholar.org/paper/206fe752b610769f86b74ba061be8c8ba9cb53da
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In Atmospheric Science
- Pawan K. Bhartia
- Kelly Chance
- Xiong Liu
- Randall V. Martin
- Pieternel F. Levelt
- T. Kurosu
- Janusz Cofala
- Gonzalo Gonzalez Abad
In Spectroscopy
Citations in the corpus
- Retrieval of large volcanic SO2 columns from the Aura Ozone Monitoring Instrument: Comparison and limitations (2007, positive): “On the basis of these considerations, (8) is rewritten as follows, VL V0 ¼ G kx Dx þG HTþG er ¼ A x x0ð Þ þG HTþG er; ð9Þ where the matrix A = G Kx is the averaging kernel [e.g., Rodgers, 2000; Eskes and Boersma, 2003].”
- The version 3 OMI NO 2 standard product (2017, neutral): “=𝑾/𝐴 (Eskes and Boersma, 2003).”
- Multi-model ensemble simulations of tropospheric NO2 compared with GOME retrievals for the year 2000 (2006, positive): “Application of averaging kernels makes the comparison independent of retrieval errors resulting from a priori profile assumptions (Eskes and Boersma, 2003).”
- Updated Smithsonian Astrophysical Observatory Ozone Monitoring Instrument (SAO OMI) formaldehyde retrieval (2015, positive): “Once the scattering weights are calculated, the averaging kernels (AKs) (Rodgers and Connor, 2003) are straightforward to be approximated using the formulation shown below for DOAS retrievals (Eskes and Boersma, 2003): AK(z)= w(z) AMF .”