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CERES ISCCP-D2like Product Information


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ISCCP-D2like Documentation


ISCCP-D2like Product Features

  • The ISCCP-D2like products provide MODIS clouds properties (not the official Goddard Product) derived from CERES retrievals that emulates the ISCCP-D2 (NASA GISS) format
    • The same MODIS cloud properties are found in the SSF1deg and SYN1deg products.
  • Use in ISCCP simulators in climate models
  • ISCCP-D2like-Day/Nit
    • Which are the MODIS cloud properties and include more than the usual ISCCP parameters.
    • The day and nit identify properties during daytime and nighttime and the daytime being of higher quality since the MODIS retrievals use both visible and IR channels
    • The Day/Nit will eventually contain the associated Top-of-Atmosphere fluxes for the ISCCP cloud types
  • ISCCP-D2like-GEO
    • Which are the geostationary cloud properties used in the CERES temporal interpolation (GEO enhanced) algorithm
    • The GEO retrievals are not the official ISCCP product but use the same 3-hourly images
  • ISCCP-D2like-Mrg
    • CERES best attempt at merging Terra and Aqua MODIS and GEO in the 3 hourly intervals where MODIS cloud retrievals are not available.
    • The GEO clouds have been normalized to MODIS to provide diurnally consistent clouds
    • The GEO clouds are of inferior quality to MODIS but provide consistent 3-hourly sampling
  • ISCCP-D1like monthly cloud amounts
    • MODIS retrievals are classified into 7 pressure and 6 optical depth bins
    • Limited to liquid and ice cloud fractions only
  • Applicable Studies:
    • GCMs, ISCCP simulators and other climate modeling studies that incorporate PC/tau cloud properties for comparison and the computation of fluxes.
    • Any study that involves ISCCP-D2like-Day/Nit data.

ISCCP-D2like 18 Cloud Types


Pressure Cloud Optical Depth
0.0 - 3.6 3.6 - 23 23 - 380
10-440mb Cirrus
(High, Thin)
liq=13, ice=16
Cirrostratus
(High, Mid-Thick)
liq=14, ice=17
Deep Convection
(High, Thick)
liq=15, ice=18
440-680mb Altocumulus
(Mid, Thin)
liq=7, ice=10
Altostratus
(Mid, Mid-Thick)
liq=8, ice=11
Nimbostratus
(Mid, Thick)
liq=9, ice=12
680-1000mb Cumulus
(Low, Thin)
liq=1, ice=4
Stratocumulus
(Low, Mid-Thick)
liq=2, ice=5
Stratus
(Low, Thick)
liq=3, ice=6

ISCCP-D2like Cloud Parameters


Cloud Parameter MODIS-only GEO-only
Cloud Area Fraction X X
Cloud Effective Pressure X X
Cloud Effective Temperature X X
Liquid Water Path X X
Ice Water Path X X
Particle size X  
Infrared Emissivity X  
Cloud Visible Optical Depth X X

ISCCP-D1like 42 Cloud Types ( available for Cloud Amounts Only)


Pressure Cloud Optical Depth
0.0 - 1.27 1.27 - 3.55 3.55 - 9.38 9.38 - 22.6 22.6 - 60.4 60.4 - 128+
  Cirrus
(High, Thin)
Cirrotratus
(High, Mid-Thick)
Deep Convection
(High, Thick)
10-180mb typ=37 typ=38 typ=39 typ=40 typ=41 typ=42
180-310mb typ=31 typ=32 typ=33 typ=34 typ=35 typ=36
310-440mb typ=25 typ=26 typ=27 typ=28 typ=29 typ=30
  Altocumulus
(Mid, Thin)
Altostratus
(Mid, Mid-Thick)
Nimbostratus
(Mid, Thick)
440-560mb typ=19 typ=20 typ=21 typ=22 typ=23 typ=24
560-680mb typ=13 typ=14 typ=15 typ=16 typ=17 typ=18
  Cumulus
(Low, Thin)
Stratocumulus
(Low, Mid-Thick)
Stratus
(Low, Thick)
680-800mb typ=7 typ=8 typ=9 typ=10 typ=11 typ=12
800-1000mb typ=1 typ=2 typ=3 typ=4 typ=5 typ=6

ISCCP-D2like Product 3-hourly Sampling Source


Index 1 2 3 4 5 6 7 8
GMT* 00-03 03-06 06-09 09-12 12-15 15-18 18-21 21-24
GEO     G G G G    
Mrg
(GEO-MODIS)
    G T-day A-day G    

* based on a region at 0° longitude

  • The merge product uses MODIS where ever possible and fills in the rest of the 3-hour intervals with GEO clouds which have been normalized to MODIS
  • The GEO cloud properties are only available during the day
  • The MODIS cloud properties are stratified by day and night, since the MODIS cloud retrieval algorithm using both visible and IR channels during the day


ISCCP-D2like Product Parameters


TOA Fluxes
(observed and computed)
Surface Fluxes
(computed)
In-Atmospheric
Fluxes
(computed)
Cloud Properties
(MODIS and GEO)
[Diurnally Complete]
Aerosols
(MODIS)
Auxiliary Data
(GMAO GEOS)
     
  • Cloud Area Fraction
  • Cloud Effective Pressure
  • Cloud Effective Temperature
  • Liquid Water Path
  • Ice Water Path
  • Water Particle Radius
  • Ice Particle Effective Diameter
  • Infrared Emissivity
  • Cloud Visible Optical Depth
   



ISCCP-D2like Spatial and Temporal Resolutions


  Spatial Resolutions
Temporal
Resolutions
Regional grid
(1°x1° latitude by longitude)
Zonal grid
(1° latitude)
Global
Monthly ISCCP-D2like-Day
ISCCP-D2like-Nit
ISCCP-D2like-GEO
ISCCP-D2like-Mrg
N/A N/A
Monthly 3-Hourly ISCCP-D2like-Day
ISCCP-D2like-Nit
ISCCP-D2like-GEO
ISCCP-D2like-Mrg
N/A N/A









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  Image: NASA Logo NASA Official: Dr. Norman Loeb
Page Curator: Edward Kizer
Page Last Modified: 10/16/2017 11:05:05 EST
Site Last Modified: 11/07/2017 17:18:43 EST