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Making limb and nad...
Making limb and nadir measurements comparable : A common volume study of PMC brightness observed by Odin OSIRIS and AIM CIPS
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- Benze, Susanne (author)
- Stockholms universitet,Meteorologiska institutionen (MISU),University of Colorado, USA
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- Gumbel, Jörg (author)
- Stockholms universitet,Meteorologiska institutionen (MISU)
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Randall, Cora E. (author)
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- Karlsson, Bodil (author)
- Stockholms universitet,Meteorologiska institutionen (MISU)
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- Hultgren, Kristoffer (author)
- Stockholms universitet,Meteorologiska institutionen (MISU)
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Lumpe, Jerry D. (author)
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Baumgarten, Gerd (author)
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(creator_code:org_t)
- Elsevier BV, 2018
- 2018
- English.
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In: Journal of Atmospheric and Solar-Terrestrial Physics. - : Elsevier BV. - 1364-6826 .- 1879-1824. ; 167, s. 66-73
- Related links:
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https://doi.org/10.1...
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https://doi.org/10.1...
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https://urn.kb.se/re...
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Abstract
Subject headings
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- Combining limb and nadir satellite observations of Polar Mesospheric Clouds (PMCs) has long been recognized as problematic due to differences in observation geometry, scattering conditions, and retrieval approaches. This study offers a method of comparing PMC brightness observations from the nadir-viewing Aeronomy of Ice in the Mesosphere (AIM) Cloud Imaging and Particle Size (CIPS) instrument and the limb-viewing Odin Optical Spectrograph and InfraRed Imaging System (OSIRIS). OSIRIS and CIPS measurements are made comparable by defining a common volume for overlapping OSIRIS and CIPS observations for two northern hemisphere (NH) PMC seasons: NH08 and NH09. We define a scattering intensity quantity that is suitable for either nadir or limb observations and for different scattering conditions. A known CIPS bias is applied, differences in instrument sensitivity are analyzed and taken into account, and effects of cloud inhomogeneity and common volume definition on the comparison are discussed. Not accounting for instrument sensitivity differences or inhomogeneities in the PMC field, the mean relative difference in cloud brightness (CIPS - OSIRIS) is -102 +/- 55%. The differences are largest for coincidences with very inhomogeneous clouds that are dominated by pixels that CIPS reports as non-cloud points. Removing these coincidences, the mean relative difference in cloud brightness reduces to -6 +/- 14%. The correlation coefficient between the CIPS and OSIRIS measurements of PMC brightness variations in space and time is remarkably high, at 0.94. Overall, the comparison shows excellent agreement despite different retrieval approaches and observation geometries.
Subject headings
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
Keyword
- Polar mesospheric cloud
- OSIRIS
- CIPS
- Common volume
- Limb
- Nadir
Publication and Content Type
- ref (subject category)
- art (subject category)
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