July 14, 2004Alexander Marshak 3D Error Assessment and Cloud Climatology from MODIS R.F. Cahalan, A. Marshak (GSFC) K.F. Evans (University of Colorado)

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Presentation transcript:

July 14, 2004Alexander Marshak 3D Error Assessment and Cloud Climatology from MODIS R.F. Cahalan, A. Marshak (GSFC) K.F. Evans (University of Colorado) L. Oreopoulos, T. Várnai, G. Wen (UMBC) Extend 3D retrieval capabilities for both passive (Terra and Aqua) and active (THOR lidar) remote sensing 1. Multiple-instrument Cloud-Aerosol I3RC Cases and 3D Toolkit [I3RC = (International) Intercomparison of 3D Radiation Codes 2. 3D Error Assessment and Cloud Climatology from MODIS 3. 3D Cloud Retrieval from MISR 4. Cloud Retrievals from THOR (Thickness from Offbeam Returns)

July 14, 2004Alexander Marshak Task I: Multiple-instrument Cloud-Aerosol I3RC Cases and 3D Toolkit Expected results Cloud cases from collocated MODIS, MISR and ASTER data such cases are based directly on observed cloud fields; all multi-instrument observed radiances are computable by “I3RC-certified” 3DRT codes; the cases provide a basic for development of improved 3D retrievals. Open Source Toolkit (led by Robert Pincus) publicly documented MC Fortran code for 3DRT; complements to widely used SHDOM. Educational pages on I3RC website ( case studies of different degrees of 3D complexity (from pp marine Sc to broken Cu) where students can learn about 3D RT and understand where and how pp approaches break down

July 14, 2004Alexander Marshak Multiple-instrument Cloud-Aerosol Cases case I: marine Sc (led by T. Varnai) Images of the same marine Sc cloud from ASTER, MODIS and MISR taken on board of Terra on May 21, 2001 at 19:41 UTC over the Pacific Ocean 60 by 60 km ASTER image (nadir view, 15 m resolution) 60 by 60 km MODIS image (1 km and 250 m resolution) 60 by 60 km MISR image (275 m resolution, 26° and 60° viewing zenith angles) Wavenumber spectrum of variations in all five images

July 14, 2004Alexander Marshak Multiple-instrument Cloud-Aerosol Cases case II: biomass burning (led by G. Wen) Biomass burning region in Brazil, Aug. 9, 2001 centered at Lat and Lon

July 14, 2004Alexander Marshak Multiple-instrument Cloud-Aerosol Cases case II: biomass burning (led by G. Wen) ASTER (VNIR 15 m and SWIR 30 m) MISR (0.67  m) km resolution (in nadir) Cf (60 o ) An (0 o ) Ca (60 o ) MODIS RGB = 2.2, 0.86, 0.55  m Biomass burning region in Brazil, Aug. 9, 2001 centered at Lat and Lon 60 km 1 km resolution 0.25 km resolution

July 14, 2004Alexander Marshak Task II: 3D Error Assessment and Cloud Climatology from MODIS Expected Results Error bounds that cloud horizontal variability introduces into retrievals Climatic distribution of 3D effects

July 14, 2004Alexander Marshak Illustration of “illuminated” and “shadowy” pixels (led by Tamas Varnai) Example with pixels’ temperature front behind X Cold Warm ILL SHAD

July 14, 2004Alexander Marshak 3D Error Assessment: Example An example of 450x200 km 2 area observed by MODIS with VIS and IR channels. The area has been divided into 36 areas of 50x50 km 2 each µm reflectance 11 µm brightness temperature

July 14, 2004Alexander Marshak Number of pixels # of “illuminated” and “shadowed” pixels (total #: ) in 50x50 km 2 areas are statistically equal

July 14, 2004Alexander Marshak Symmetry at 11  m So is IR brightness temperature

July 14, 2004Alexander Marshak Asymmetry at 0.86 and 2.1  m Each dot corresponds to a 50x50 km 2 area. Averaged reflectancies over “illuminated” pixels are plotted vs. “shadowed” ones. The ill. slopes are much brighter than the shad. ones!

July 14, 2004Alexander Marshak Effects on  and r eff Comparison of mean optical depth, , and mean effective radius, r eff, at the illuminated and shadowed portion of 50 by 50 km areas 3D effects may have a strong influence!

July 14, 2004Alexander Marshak Example of climatic distribution of 3D effects Comparison of the histograms of the cloud asymmetry in optical depth retrieved from clouds over land and ocean. The inset shows the histograms of the asymmetry vs. differences between average optical depths of illuminated and shadowed pixels,  TS and  AS, respectively.

July 14, 2004Alexander Marshak “Forward” vs. “Backward” scattering from Loeb and Coakley (1998) Based on AVHRR data from Buriez et al. (2001) Based on Polder data Earlier studies on 3D effect: For oblique sun, clouds appear too thick & forward reflection is too low

July 14, 2004Alexander Marshak “Forward” vs. “Backward” scattering MODIS geometry MODIS granule Ground track of satellite satellite Incoming sunlight MODIS observes forward scattering MODIS observes back scattering At 40 o latitude, clouds are not viewed from the exact forward and backward directions but rather 50 o off the plane of solar azimuth

July 14, 2004Alexander Marshak “Forward” vs. “Backward” scattering MODIS data Nov. 1, 8, 15, 22, 29 in 2000, 2001, 2002, MODIS granules from Terra in 2000 and 2001 and from both Terra and Aqua in 2002 and Total: 300 granules. Form a ring around the Earth at roughly 40 o North. Liquid clouds only with  > 2.

July 14, 2004Alexander Marshak “Forward” vs. “Backward” scattering MODIS data Mean optical depth as a function of SZA and VZA Mean optical depth (normalized by SZA) as a function of VZA

July 14, 2004Alexander Marshak “Forward” vs. “Backward” scattering MODIS data: saturated pixels Fraction of “saturated” pixels as a function of VZA

July 14, 2004Alexander Marshak Climatic distribution of 3D effects (led by Lazaros Oreopoulos) Latitudinal variation (-70° to 70°) of inhomogeneity parameter  of Cahalan (1994) and optical depth  for water clouds from MODIS data. Variations of optical depth are possibly exaggerated due to biases in optical depth retrievals under oblique illumination. 3D retrievals are needed to remove such biases. from the histogram of optical depth for the entire month the average for an entire year of monthly values

July 14, 2004Alexander Marshak Task II: Conclusion Statistical asymmetry is a direct signature of cloud 3D structure that cannot be taken into account in 1D retrievals: Estimate the errors that horizontal cloud variability introduces into retrievals of cloud properties; Study the climatology of 3D effects by analyzing how cloud 3D structure varies with geographical region, season and climatic conditions.

July 14, 2004Alexander Marshak Task III: 3D Cloud Retrievals from MISR (led by Frank Evans) Expected results 3D algorithm for cloud optical depth and top height retrievals Importance of textural and angular parameters for optical depth and height Estimates of improvements

July 14, 2004Alexander Marshak 3D Cloud Retrievals from MISR 3D cloud retrieval algorithm The liquid water path (LWP) from LES cloud fields is shown in the upper left. The middle left has the LWP fields for one of the stochastic fields generated with statistics of the 8 LES fields. The stochastic field with a grid spacing of 67 m is averaged 4x4 columns to obtain the MISR nadir resolution optical depth and cloud top height shown in the lower left. Reflectances at the nine MISR angles are computed with the SHDOM 3D radiative transfer code. The reflectances at MISR resolution for the five angles used in the retrieval simulation are shown in the right column.

July 14, 2004Alexander Marshak Task IV: THOR Lidar Retrievals (led by Bob Cahalan and Tamas Varnai) Objectives - Measure geometrical thickness of optically thick clouds Accomplishments - Measured cloud geometric thicknesses: 500–1000 m ± 30 m,  > 25 Exp. results - algorithms for cloud geometrical thickness and extinction retrievals

July 14, 2004Alexander Marshak THOR Color Composite (R,G,B) = (1,7,8) NASA P-3B at 8.53 km Ch4 Ch3 Ch7 Thin Cirrus Cloud Layer Thick Lower Stratus Deck

July 14, 2004Alexander Marshak 3D Error Assessment and Cloud Climatology from MODIS A. Marshak, R.F. Cahalan (GSFC) K.F. Evans (University of Colorado) L. Oreopoulos, T. Várnai, G. Wen (UMBC) Extend 3D retrieval capabilities for both passive (Terra and Aqua) and active (THOR lidar) remote sensing 1. Multiple-instrument Cloud-Aerosol I3RC Cases and 3D Toolkit [I3RC = (International) Intercomparison of 3D Radiation Codes 2. 3D Error Assessment and Cloud Climatology from MODIS 3. 3D Cloud Retrieval from MISR 4. Cloud Retrievals from THOR (Thickness from Offbeam Returns)