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| Titel |
Stratospheric aerosol particle size information in Odin-OSIRIS limb scatter spectra |
| VerfasserIn |
L. A. Rieger, A. E. Bourassa, D. A. Degenstein |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1867-1381
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| Digitales Dokument |
URL |
| Erschienen |
In: Atmospheric Measurement Techniques ; 7, no. 2 ; Nr. 7, no. 2 (2014-02-13), S.507-522 |
| Datensatznummer |
250115600
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| Publikation (Nr.) |
 copernicus.org/amt-7-507-2014.pdf |
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| Zusammenfassung |
| The Optical Spectrograph and InfraRed Imaging System (OSIRIS) onboard the
Odin satellite has now taken over a decade of limb scatter measurements that
have been used to retrieve the version 5 stratospheric aerosol extinction
product. This product is retrieved using a representative particle size
distribution to calculate scattering cross sections and scattering phase
functions for the forward model calculations. In this work the information
content of OSIRIS measurements with respect to stratospheric aerosol is
systematically examined for the purpose of retrieving particle size
information along with the extinction coefficient. The benefit of using
measurements at different wavelengths and scattering angles in the retrieval
is studied, and it is found that incorporation of the 1530 nm radiance
measurement is key for a robust retrieval of particle size information. It is
also found that using OSIRIS measurements at the different solar geometries
available on the Odin orbit simultaneously provides little additional
benefit. Based on these results, an improved aerosol retrieval algorithm is
developed that couples the retrieval of aerosol extinction and mode radius of
a log-normal particle size distribution. Comparison of these results with
coincident measurements from SAGE III shows agreement in retrieved extinction
to within approximately 10% over the bulk of the aerosol layer, which is
comparable to version 5. The retrieved particle size, when converted to
Ångström coefficient, shows good qualitative agreement with SAGE II
measurements made at somewhat shorter wavelengths. |
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