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Atmospheric Measurement Techniques An interactive open-access journal of the European Geosciences Union
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Volume 11, issue 6 | Copyright

Special issue: CALIPSO version 4 algorithms and data products

Atmos. Meas. Tech., 11, 3281-3296, 2018
https://doi.org/10.5194/amt-11-3281-2018
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Research article 08 Jun 2018

Research article | 08 Jun 2018

Laser pulse bidirectional reflectance from CALIPSO mission

Xiaomei Lu1,2, Yongxiang Hu2, Yuekui Yang3, Mark Vaughan2, Zhaoyan Liu2, Sharon Rodier1,2, William Hunt1,2, Kathy Powell2, Patricia Lucker1,2, and Charles Trepte2 Xiaomei Lu et al.
  • 1Science Systems and Applications, Inc., Hampton, VA 23666, USA
  • 2NASA Langley Research Center, Hampton, VA 23681, USA
  • 3NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA

Abstract. This paper presents an innovative retrieval method that translates the CALIOP land surface laser pulse returns into the surface bidirectional reflectance. To better analyze the surface returns, the CALIOP receiver impulse response and the downlinked samples' distribution at 30m vertical resolution are discussed. The saturated laser pulse magnitudes from snow and ice surfaces are recovered based on information extracted from the tail end of the surface signal. The retrieved snow surface bidirectional reflectance is compared with reflectance from both CALIOP cloud-covered regions and MODIS BRDF–albedo model parameters. In addition to the surface bidirectional reflectance, the column top-of-atmosphere bidirectional reflectances are calculated from the CALIOP lidar background data and compared with the bidirectional reflectances derived from WFC radiance measurements. The retrieved CALIOP surface bidirectional reflectance and column top-of-atmosphere bidirectional reflectance results provide unique information to complement existing MODIS standard data products and are expected to have valuable applications for modelers.

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This paper presents an innovative retrieval method that translates the CALIOP land surface laser pulse returns into the surface bidirectional reflectance. The surface bidirectional reflectances retrieved from CALIOP measurements contribute complementary data for existing MODIS standard data products and could be used to detect and monitor seasonal surface reflectance changes in high latitude regions where passive MODIS measurements are limited.
This paper presents an innovative retrieval method that translates the CALIOP land surface laser...
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