POLDER Description

Measurements

POLDER, PARASOL

Local Observation Time and Length of Data Record

1:30 PM ; 2006–2008

Spatial Resolution

6 km (detection), 20 km (retrieval)

Cloud Detection

Multi-spectral+angle, VIS/NIR threshold tests

Retrieval Methodology

Phase (water/ice), COD, CP

POLDER determines cloud thermodynamical phase and COD using VIS / NIR polarization and a Look-Up Table approach. Cloud pressure is determined through differential absorption using two channels in the O2 A-band.

Ancillary Input

  • radiative transfer
  • particle model (inhomogeneous hexagonal columns for ice)
  • References

  • Parol, F., J. C. Buriez, C. Vanbauce, J. Riedi, L. C. Labonnote, M. Doutriaux-Boucher, M. Vesperini, G. Sèze, P. Couvert, M. Viollier, F. M. Bréon, 2004: Capabilities of multi-angle polarization cloud measurements from satellite: POLDER results, Adv. Space Res., 33, 1080-1088.
  • Goloub P., M. Herman, H. Chepfer, J. Riedi, G. Brogniez, P. Couvert, G. Sèze, 2000: Cloud Thermodynamic Phase Classification from the POLDER Spaceborne instrument. J. Geophys. Res., 105, 14747-14759.
  • Ferlay, N., F. Thieuleux, C. Cornet, A. B. Davis, P. Dubuisson, F. Ducos, F. Parol, J. Riedi, C. Vanbauce, 2010: Toward new inferences about cloud structures from multidirectional measurements in the oxygen A band: Middle-of-cloud pressure and cloud geometrical thickness from POLDER3/PARASOL. J. Appl. Meteor. Clim., doi: 10.1175/2010JAMC2550.1