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The retrieval of profile and chemical information from ground-based UV-visible spectroscopic measurements |
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| Authors: | R Schofield BJ Connor PV Johnston |
| Institution: | a National Institute of Water and Atmospheric Research, Lauder, New Zealand b School of Geography and Environmental Science, Auckland University, Auckland, New Zealand c Atmospheric, Oceanic and Planetary Physics, Oxford University, Oxford, UK |
| Abstract: | An algorithm has been developed to retrieve altitude information at different diurnal stages for trace gas species by combining direct-sun and zenith-sky UV-visible differential slant column density (DSCD) measurements. DSCDs are derived here using differential optical absorption spectroscopy. Combining the complementary zenith-sky measurements (sensitive to the stratosphere) with direct-sun measurements (sensitive to the troposphere) allows this vertical distinction. Trace gas species such as BrO and NO2 have vertical profiles with strong diurnal dependence. Information about the diurnal variation is simultaneously retrieved with the altitude distribution of the trace gas. The retrieval is a formal optimal estimation profile retrieval, allowing a complete assessment of information content and errors. |
| Keywords: | Ozone DOAS Air mass factor Inverse Radiative transfer |
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