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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Preprints
https://doi.org/10.5194/amt-2019-373
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/amt-2019-373
© Author(s) 2020. This work is distributed under
the Creative Commons Attribution 4.0 License.

  04 Feb 2020

04 Feb 2020

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A revised version of this preprint is currently under review for the journal AMT.

Cloud top pressure retrieval with DSCOVR-EPIC oxygen A and B bands observation

Bangsheng Yin1, Qilong Min1, Emily Morgan1, Yuekui Yang2, Alexander Marshak2, and Anthony B. Davis3 Bangsheng Yin et al.
  • 1Atmospheric Sciences Research Center, University at Albany, Albany, NY, USA
  • 2NASA Goddard Space Flight Center, Climate and Radiation Laboratory, Greenbelt, MD, USA
  • 3Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA, USA

Abstract. An analytic transfer model for Earth Polychromatic Imaging Camera (EPIC) observation was proposed to retrieve the cloud top pressure (CTP) with considering in-cloud photon penetration. In this model, an analytic equation was developed to represent the reflection at top of atmosphere (TOA) from above cloud, in-cloud and below-cloud. The coefficients of this analytic equation can be derived from a series of EPIC simulations under different atmospheric conditions using a non-linear regression algorithm. With estimated cloud pressure thickness, the CTP can be retrieved from EPIC observation data by solving the analytic equation. To simulate the EPIC measurements, a program package using the double-k approach was developed, which can calculate high-accuracy results with a one-hundred-fold time reduction. During the retrieval processes, two kinds of retrieval results, i.e., baseline CTP and retrieved CTP, are provided. The baseline CTP is derived without considering in-cloud photon penetration, and the retrieved CTP is derived by solving the analytic equation, taking into consideration the in-cloud and below-cloud interactions. The retrieved CTP for the oxygen A and B bands are smaller than their related baseline CTP. At the same time, both baseline CTP and retrieved CTP at the oxygen B-band are obviously larger than those at the oxygen A-band. Compared to the difference of baseline CTP between the B-band and A-band, the difference of retrieved CTP between these two bands is generally reduced.

Bangsheng Yin et al.

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Bangsheng Yin et al.

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Latest update: 04 Aug 2020
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Short summary
The cloud top pressure (CTP) is an important cloud property for climate and weather studies. Based on differential oxygen absorption, both EPIC oxygen A-band and B-band pairs can be used to retrieve CTP. However, currently it is still very challenging to do the retrieval accurately due to the complicated in-cloud penetration effect. To address the issue of in-cloud penetration, we proposed an analytic method to retrieve the CTP by using DSCOVR EPIC oxygen A- and B-band observation.
The cloud top pressure (CTP) is an important cloud property for climate and weather studies....
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