Cloud top height comparisons from ASTER, MISR, and MODIS for trade wind cumuli

Iliana Genkova, Gabriela Seiz, Paquita Zuidema, Guangyu Zhao, Larry Di Girolamo

Research output: Contribution to journalArticle

30 Citations (Scopus)

Abstract

ASTER stereo and ASTER infrared (IR) retrieved cloud top heights (CTHs) at 90 m spatial resolution are compared to operational Multi-Angle Imaging SpectroRadiometer (MISR) stereo and MODerate Resolution Imaging Spectroradiometer (MODIS) thermal IR techniques at 1100 m and 5000 m spatial resolution, respectively. ASTER data availability limits this study to trade wind cumulus clouds only. ASTER IR, MISR stereo and MODIS IR cloud height frequency distributions were derived for 41 trade wind cumulus cloud scenes with no cirrus contamination. All three retrievals produce a bimodal CTH distribution with maxima at 650 and 1500 m. Several scenes are investigated in further details utilizing the ASTER stereo heights. The ASTER stereo-derived CTH frequency distribution is also bimodal and coincides best with a surface-based ceilometer-derived cloud base height distribution, in the sense that it produces the fewest CTH retrievals below the typical lidar-observed cloud base height. Sensitivity to spatial resolution was investigated by degrading ASTER stereo and IR CTH retrievals to the MISR spatial resolution, and also by deriving ASTER stereo heights from degraded radiances. The degraded ASTER stereo CTH retrievals remain bimodal, but showed less high clouds and more lower clouds, whereas the ASTER stereo heights from degraded radiances lose the bimodal structure similarly to the ASTER degraded resolution IR technique. Overall, the stereo technique appears more suitable for retrieving CTH for trade wind cumulus clouds than IR techniques, because it shows less sensitivity to resolution. With either technique CTHs should be produced at the high spatial resolution (finer than 1 km) and with subsampling preferred over spatial averaging, if necessary. Nonetheless, even at a spatial resolution of 1 km (which often exceeds the horizontal size of many trade wind cumulus clouds) both stereo and IR techniques reflect the CTH bimodality characterizing the scenes we studied.

Original languageEnglish (US)
Pages (from-to)211-222
Number of pages12
JournalRemote Sensing of Environment
Volume107
Issue number1-2
DOIs
StatePublished - Mar 15 2007

Fingerprint

Advanced Spaceborne Thermal Emission and Reflection Radiometer
trade winds
MISR
spectroradiometers
trade wind
ASTER
moderate resolution imaging spectroradiometer
cumulus
MODIS
image analysis
Imaging techniques
spatial resolution
Infrared radiation
comparison
Infrared imaging
radiance
methodology
lidar

Keywords

  • ASTER
  • Cloud top height
  • MISR
  • MODIS
  • Trade wind cumulus

ASJC Scopus subject areas

  • Computers in Earth Sciences
  • Earth-Surface Processes
  • Environmental Science(all)
  • Management, Monitoring, Policy and Law

Cite this

Cloud top height comparisons from ASTER, MISR, and MODIS for trade wind cumuli. / Genkova, Iliana; Seiz, Gabriela; Zuidema, Paquita; Zhao, Guangyu; Di Girolamo, Larry.

In: Remote Sensing of Environment, Vol. 107, No. 1-2, 15.03.2007, p. 211-222.

Research output: Contribution to journalArticle

Genkova, Iliana ; Seiz, Gabriela ; Zuidema, Paquita ; Zhao, Guangyu ; Di Girolamo, Larry. / Cloud top height comparisons from ASTER, MISR, and MODIS for trade wind cumuli. In: Remote Sensing of Environment. 2007 ; Vol. 107, No. 1-2. pp. 211-222.
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