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Remote Sens. 2018, 10(12), 1875; https://doi.org/10.3390/rs10121875

MISR Radiance Anomalies Induced by Stratospheric Volcanic Aerosols

1
NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
2
Earth System Science Interdisciplinary Center, University of Maryland, College Park, MD 20740, USA
3
Joint Center for Earth Systems Technology, University of Maryland, Baltimore County, MD 21250, USA
4
Science Systems and Applications, Inc., Lanham, MD 20706, USA
5
Universities Space Research Association, Columbia, MD 21046, USA
*
Author to whom correspondence should be addressed.
Received: 7 October 2018 / Revised: 15 November 2018 / Accepted: 20 November 2018 / Published: 23 November 2018
(This article belongs to the Special Issue MISR)
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Abstract

The 16-year MISR monthly radiances are analyzed in this study, showing significant enhancements of anisotropic scattering at high latitudes after several major volcanic eruptions with injection heights greater than 14 km. The anomaly of deseasonalized radiance anisotropy between MISR’s DF and DA views (70.5° forward and aft) is largest in the blue band with amplitudes amounting to 5–15% of the mean radiance. The anomalous radiance anisotropy is a manifestation of the stronger forward scattering of reflected sunlight due to the direct and indirect effects of stratospheric volcanic aerosols (SVAs). The perturbations of MISR radiance anisotropy from the Kasatochi (August 2008), Sarychev (June 2009), Nabro (June 2011) and Calbuco (April 2015) eruptions are consistent with the poleward transported SVAs observed by CALIOP and OMPS-LP. In a particular scene over the Arctic Ocean, the stratospheric aerosol mid-visible optical depth can reach as high as 0.2–0.5. The enhanced global forward scattering by SVAs has important implications for the shortwave radiation budget. View Full-Text
Keywords: radiance anisotropy; volcanic aerosol direct and indirect effects; shortwave radiation radiance anisotropy; volcanic aerosol direct and indirect effects; shortwave radiation
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Wu, D.L.; Wang, T.; Várnai, T.; Limbacher, J.A.; Kahn, R.A.; Taha, G.; Lee, J.N.; Gong, J.; Yuan, T. MISR Radiance Anomalies Induced by Stratospheric Volcanic Aerosols. Remote Sens. 2018, 10, 1875.

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