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A novel tropospheric NO2 DOAS retrieval algorithm optimised for anadir-viewing satellite instrument imaging polluted areas is proposed in thiswork. Current satellite DOAS retrievals have relied on using a solarreference spectrum to derive a total slant column, then using either modelassimilation or spatial filtering to derive the tropospheric component. Inthe ERrs-DOAS (Earth radiance reference sector DOAS) algorithm, troposphericNO2 slant columns are derived using spectra averaged from measurementsover unpolluted regions, thus removing the need for post-hoc separationtechniques, though some residual stratospheric biases may still remain. Tovalidate the ERrs-DOAS algorithm, DOAS retrievals were performed on modelledspectra created by the radiative transfer model SCIATRAN, as well as L1BEarth radiance data measured by the NASA/KNMI Ozone Monitoring Instrument(OMI). It was found that retrievals using an Earth radiance reference producespatial distributions of tropospheric NO2 over eastern China during June2005 that highly correlate with those derived using existing retrievalalgorithms. Comparisons with slant columns retrieved by the operationalNO2 retrieval algorithm for OMI (OMNO2A) show that the ERrs-DOASalgorithm greatly reduces the presence of artificial across-track biases(stripes) caused by calibration errors, as well as the removal of path lengthenhancement in off-nadir pixels. Analysis of Pacific SCDs suggests that thealgorithm also produces a 27% reduction in retrieval uncertainty, thoughthis may be partially due to biases introduced by differences in theretrieval algorithm settings. The ERrs-DOAS technique also reveals absorptionfeatures over the Sahara and similar regions characteristic of sand andliquid H2O absorption, as first discovered in the analysis of GOME-2NO2 retrievals

An improved retrieval of tropospheric NO&lt;sub&gt;2&lt;/sub&gt; from space over polluted regions using an Earth radiance reference

An improved retrieval of tropospheric NO<sub>2</sub> from space over polluted regions using an Earth radiance reference