Cloud mask over snow-/ice-covered areas for the GCOM-C1/SGLI cryospheremission: Validations over Greenland

Nan Chen, Wei Li, Tomonori Tanikawa, Masashiro Hori, Teruo Aoki, Knut Stamnes

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Cloud detection is a critically important first step required to derive many satellite data products. A novel cloud detection algorithm designed for the cryosphere mission of Global Climate Observation Mission First Climate satellite/Second Generation Global Imager (GCOM-C1/SGLI) is presented. This reflectance-based cloud detection scheme mainly utilizes only two short wavelength infrared channels with dynamic thresholds that depend on Sun-satellite viewing geometry to perform accurate cloud detection over snow/ice surfaces in high latitude as well as high-elevation regions. Profiles of atmospheric absorbing and scattering molecules as well as surface elevation are considered in the determination of the thresholds for the resulting snow/ice cloud mask (SCM) algorithm. Image-based tests and statistical results have been used to validate the performance of the SCM over the Greenland plateau. Statistics using collocated Cloud-Aerosol Lidar with Orthogonal Polarization and Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua observations over Greenland in 2007 show that over snow/ice surfaces the performance of the SCM is generally better than that of the MODIS cloud mask.

Original languageEnglish
Pages (from-to)12287-12300
Number of pages14
JournalJournal of Geophysical Research
Volume119
Issue number21
DOIs
Publication statusPublished - Nov 16 2014
Externally publishedYes

Fingerprint

Greenland
Ice
snow
Snow
Masks
ice
masks
ice clouds
Satellites
MODIS (radiometry)
climate
Imaging techniques
cryospheres
MODIS
Optical radar
data products
Aerosols
thresholds
Image sensors
Sun

Keywords

  • Cloud detection
  • Dynamic threshold
  • Polar regions and high-elevation area
  • Snow and ice

ASJC Scopus subject areas

  • Atmospheric Science
  • Geophysics
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science

Cite this

Cloud mask over snow-/ice-covered areas for the GCOM-C1/SGLI cryospheremission : Validations over Greenland. / Chen, Nan; Li, Wei; Tanikawa, Tomonori; Hori, Masashiro; Aoki, Teruo; Stamnes, Knut.

In: Journal of Geophysical Research, Vol. 119, No. 21, 16.11.2014, p. 12287-12300.

Research output: Contribution to journalArticle

Chen, Nan ; Li, Wei ; Tanikawa, Tomonori ; Hori, Masashiro ; Aoki, Teruo ; Stamnes, Knut. / Cloud mask over snow-/ice-covered areas for the GCOM-C1/SGLI cryospheremission : Validations over Greenland. In: Journal of Geophysical Research. 2014 ; Vol. 119, No. 21. pp. 12287-12300.
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