Inter-calibration of nine UV sensing instruments over Antarctica and Greenland since 1980

Inter-calibration of nine UV sensing instruments over Antarctica and Greenland since 1980

<p>Nadir-viewed intensities (radiances) from nine UV sensing satellite instruments are calibrated over the East Antarctic Plateau and Greenland during summer. The calibrated radiances from these UV instruments ultimately will provide a global long-term record of cloud trends and cloud response...

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Main Authors: C. J. Weaver, P. K. Bhartia, D. L. Wu, G. J. Labow, D. E. Haffner
Format: Article
Language:English
Published: Copernicus Publications 2020-10-01
Series:Atmospheric Measurement Techniques
Online Access:https://amt.copernicus.org/articles/13/5715/2020/amt-13-5715-2020.pdf
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spelling doaj-6afeff8459aa4e8fa394e38518db87b32020-11-25T03:59:58ZengCopernicus PublicationsAtmospheric Measurement Techniques1867-13811867-85482020-10-01135715572310.5194/amt-13-5715-2020Inter-calibration of nine UV sensing instruments over Antarctica and Greenland since 1980C. J. Weaver0C. J. Weaver1P. K. Bhartia2D. L. Wu3G. J. Labow4G. J. Labow5D. E. Haffner6D. E. Haffner7Atmospheric Chemistry and Dynamics Branch, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAEarth System Science Interdisciplinary Center (ESSIC), University of Maryland, College Park, MD 20742, USAAtmospheric Chemistry and Dynamics Branch, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAClimate and Radiation Laboratory, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAAtmospheric Chemistry and Dynamics Branch, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAScience Systems and Applications (SSAI), Inc., Lanham, MD 20706, USAAtmospheric Chemistry and Dynamics Branch, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USAScience Systems and Applications (SSAI), Inc., Lanham, MD 20706, USA<p>Nadir-viewed intensities (radiances) from nine UV sensing satellite instruments are calibrated over the East Antarctic Plateau and Greenland during summer. The calibrated radiances from these UV instruments ultimately will provide a global long-term record of cloud trends and cloud response from ENSO events since 1980. We first remove the strong solar zenith angle dependence from the intensities using an empirical approach rather than a radiative transfer model. Then small multiplicative adjustments are made to these solar zenith angle normalized intensities in order to minimize differences when two or more instruments temporally overlap. While the calibrated intensities show a negligible long-term trend over Antarctica and a statistically insignificant UV albedo trend of <span class="inline-formula">−0.05</span>&thinsp;% per decade over the interior of Greenland, there are small episodic reductions in intensities which are often seen by multiple instruments. Three of these darkening events are explained by boreal forest. Other events are caused by surface melting or volcanoes. We estimate a 2-sigma uncertainty of 0.35&thinsp;% for the calibrated radiances.</p>https://amt.copernicus.org/articles/13/5715/2020/amt-13-5715-2020.pdf
collection DOAJ
language English
format Article
sources DOAJ
author C. J. Weaver
C. J. Weaver
P. K. Bhartia
D. L. Wu
G. J. Labow
G. J. Labow
D. E. Haffner
D. E. Haffner
spellingShingle C. J. Weaver
C. J. Weaver
P. K. Bhartia
D. L. Wu
G. J. Labow
G. J. Labow
D. E. Haffner
D. E. Haffner
Inter-calibration of nine UV sensing instruments over Antarctica and Greenland since 1980
Atmospheric Measurement Techniques
author_facet C. J. Weaver
C. J. Weaver
P. K. Bhartia
D. L. Wu
G. J. Labow
G. J. Labow
D. E. Haffner
D. E. Haffner
author_sort C. J. Weaver
title Inter-calibration of nine UV sensing instruments over Antarctica and Greenland since 1980
title_short Inter-calibration of nine UV sensing instruments over Antarctica and Greenland since 1980
title_full Inter-calibration of nine UV sensing instruments over Antarctica and Greenland since 1980
title_fullStr Inter-calibration of nine UV sensing instruments over Antarctica and Greenland since 1980
title_full_unstemmed Inter-calibration of nine UV sensing instruments over Antarctica and Greenland since 1980
title_sort inter-calibration of nine uv sensing instruments over antarctica and greenland since 1980
publisher Copernicus Publications
series Atmospheric Measurement Techniques
issn 1867-1381
1867-8548
publishDate 2020-10-01
description <p>Nadir-viewed intensities (radiances) from nine UV sensing satellite instruments are calibrated over the East Antarctic Plateau and Greenland during summer. The calibrated radiances from these UV instruments ultimately will provide a global long-term record of cloud trends and cloud response from ENSO events since 1980. We first remove the strong solar zenith angle dependence from the intensities using an empirical approach rather than a radiative transfer model. Then small multiplicative adjustments are made to these solar zenith angle normalized intensities in order to minimize differences when two or more instruments temporally overlap. While the calibrated intensities show a negligible long-term trend over Antarctica and a statistically insignificant UV albedo trend of <span class="inline-formula">−0.05</span>&thinsp;% per decade over the interior of Greenland, there are small episodic reductions in intensities which are often seen by multiple instruments. Three of these darkening events are explained by boreal forest. Other events are caused by surface melting or volcanoes. We estimate a 2-sigma uncertainty of 0.35&thinsp;% for the calibrated radiances.</p>
url https://amt.copernicus.org/articles/13/5715/2020/amt-13-5715-2020.pdf
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