ACP Atmospheric Chemistry and Physics ACP 1680-7324 Copernicus GmbH Göttingen, Germany 10.5194/acp-10-4741-2010 Improvements in the profiles and distributions of nitric acid and nitrogen dioxide with the LIMS version 6 dataset Remsberg E. 1 Natarajan M. 1 Marshall B. T. 2 Gordley L. L. 2 Thompson R. E. 2 Lingenfelser G. 3 NASA Langley Research Center, 21 Langley Blvd., Mail Stop 401B, Hampton, VA 23681 USA GATS Incorporated, 11864 Canon Blvd., Suite 101, Newport News, VA 23606 USA SSAI, 1 Enterprise Parkway, Hampton, VA 23661 USA 26 05 2010 10 10 4741 4756 This is an open-access article ditributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. This article is available from http://www.atmos-chem-phys.net/10/4741/2010/acp-10-4741-2010.html The full text article is available as a PDF file from http://www.atmos-chem-phys.net/10/4741/2010/acp-10-4741-2010.pdf

The quality of the Nimbus 7 Limb Infrared Monitor of the Stratosphere (LIMS) nitric acid (HNO<sub>3</sub>) and nitrogen dioxide (NO<sub>2</sub>) profiles and distributions of 1978/1979 are described after their processing with an updated, Version 6 (V6) algorithm and subsequent archival in 2002. Estimates of the precision and accuracy of both of those species are developed and provided herein. The character of the V6 HNO<sub>3</sub> profiles is relatively unchanged from that of the earlier LIMS Version 5 (V5) profiles, except in the upper stratosphere where the interfering effects of CO<sub>2</sub> are accounted for better with V6. The accuracy of the retrieved V6 NO<sub>2</sub> is also significantly better in the middle and upper stratosphere, due to improvements in its spectral line parameters and in the reduced biases for the accompanying V6 temperature and water vapor profiles. As a result of these important updates, there is better agreement with theoretical calculations for profiles of the HNO<sub>3</sub>/NO<sub>2</sub> ratio, day-to-night NO<sub>2</sub> ratio, and with estimates of the production of NO<sub>2</sub> in the mesosphere and its descent to the upper stratosphere during polar night. In particular, the findings for middle and upper stratospheric NO<sub>2</sub> should also be more compatible with those obtained from more recent satellite sensors because the effects of the spin-splitting of the NO<sub>2</sub> lines are accounted for now with the LIMS V6 algorithm. The improved precisions and more frequent retrievals of the LIMS profiles along their orbit tracks provide for better continuity and detail in map analyses of these two species on pressure surfaces. It is judged that the chemical effects of the oxides of nitrogen on ozone can be studied quantitatively throughout the stratosphere with the LIMS V6 data.

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