# Presentation: 248950

## CERES/MODIS/MISR Synergy

- Hampton University/NASA Langley Research Center, VA

- Mar 23rd 2005, MODIS Science Team Mtg, Baltimore, MD

## Data Fusion and CERES

**-> Development of improved Angular Distribution Models (ADMs) (CERES+MODIS+GMAO).**
**-> Model calculation of surface, within-atmosphere and top-of-atmosphere radiative fluxes (CERES+MODIS+GMAO+MATCH).**
**-> Time and space averages of CERES fluxes (CERES+MODIS+GMAO+GEO).**

**Data Fusion and CERES**

## Slide 3

## CERES Single Scanner Footprint (SSF) Product

- Coincident CERES radiances and imager-based cloud and aerosol
- 	properties (including MOD04 and NOAA-NESDIS aerosol products).
- - Use VIRS (TRMM) or MODIS (Terra, Aqua) to determine the following
- 	parameters in up to 2 cloud layers over every CERES FOV:

- Macrophysical:	Fractional coverage, Height, Radiating Temperature, Pressure
- Microphysical :	Phase, Optical Depth, Particle Size, Water Path
- Clear Area      :	Albedo, Skin Temperature, Aerosol optical depth, Emissivity** **

## Selected Science Problems Involving CERES/MODIS/MISR Data Fusion

** ****Direct Radiative Effects of Aerosols – Ocean and Land.**
** ****Cloud-Aerosol Interaction Studies.**

**Selected Science Problems Involving CERES/MODIS/MISR Data Fusion**

## Development and Validation of 

**CERES Angular Distribution Models**

## Slide 7

## CERES/Terra Shortwave ADMs for Different Scene Types

| Scene Type | Description |
| --- | --- |
| Clear Ocean | Function of wind speed; Correction for aerosol optical depth included. |
| Cloud Ocean
 | Function of cloud phase; Continuous function of cloud fraction and cloud optical depth (5-parameter sigmoid). |
| Land & Desert Clear | 1 regional monthly ADMs using Analytical Function of TOA BRDF (Ahmad and Deering, 1992). |
| Land & Desert Cloud | Function of cloud phase; continuous function of cloud cover and cloud optical depth; uses 1-regional clear-sky BRDFs to account for background albedo. |
| Permanent Snow | Cloud Fraction, Surface Brightness, cloud optical depth |
| Fresh Snow | Cloud Fraction, Surface Brightness, Snow Fraction, cloud optical 	depth |
| Sea-Ice | Cloud Fraction, Surface Brightness, Ice Fraction, cloud optical 	depth |

**CERES/Terra Shortwave ADMs for Different Scene Types**

## SW Anisotropy of Liquid Water Clouds from CERES Terra

**SW Anisotropy of Liquid Water Clouds from CERES *****Terra***

## Slide 10

## CERES-MODIS Instantaneous TOA Flux 

- Consistency Tests

**- Convert imager nadir visible radiance to broadband flux**
**Compare off-nadir CERES flux with nadir flux inferred from imager visible radiance**
** ****79 global alongtrack days over 4 years**

## Slide 12

## CERES-MISR Albedo Comparison

- CERES Footprint

**- Convert MISR radiances and albedos to broadband SW.**
**- Are CERES and MISR albedos consistent?**
**- Infer TOA albedo from every MISR angle using CERES ADMs**
**- Are albedos from different angles consistent?**
**- How do differences depend upon cloud type and degree of   **
**  ****anisotropy and inhomogeneity?**

- MISR radiances

## Slide 14

## CERES, MODIS and MISR Radiance Comparison

## Direct Radiative Effects of Aerosols 

## Slide 17

## Slide 18

## DJF

- Aerosol Direct Radiative Effect (W m-2)

- Direct Radiative Effect of Aerosols Inferred from MODIS Clear-Sky Radiances

- NOAA/NESDIS Clear Scenes

- JJA

- MOD04 Clear Scenes

- JJA

## Difference in Direct Radiative Effect Due to Sampling of Clear Scenes

- (W m-2)

- JJA

- DJF

- Difference in Aerosol Optical Depth from MODIS: NOAA/NESDIS – MOD04

- JJA

- DJF

## Global Average Direct Radiative Effect of Aerosols & AOT 

|  | JJA |  | DJF |  |
| --- | --- | --- | --- | --- |
|  | NOAA
Clear | MOD04
Clear | NOAA
Clear | MOD04
Clear |
| Direct Effect 
(W m-2) | -3.54 | -5.48 | -3.95 | -5.23 |
| 0.65 m AOT | 0.112 | 0.139 | 0.131 | 0.127 |

**Global Average Direct Radiative Effect of Aerosols & AOT **
**Over Ocean**

## Global Direct Radiative Effect of Aerosols

- JAN, 2001

- APR, 2001

- JUL, 2001

- OCT, 2001

- (CERES+MOD04+MOD43)

## Relative Frequency (%)

- CERES Minus Aeronet (W m-2)

- Aerosol Direct Effect (W m-2)

**Direct Radiative Effect of Aerosols Over Land **
**(Comparison with Aeronet-Derived Values)**

- Aeronet-derived DREA provided by Stefan Kinne

## Cloud-Aerosol Interaction Studies

## SW Flux Anomaly vs Cloud Fraction Anomaly (May, 2000-2003)

## Slide 26

## Shallow Cloud Fraction Anomaly vs Aerosol Opt. Depth Anomaly (May, 2000-2003)

## Summary

**However, a lot more can be done: CERES, MODIS & MISR instruments provide complementary information (broadband, spectral and multiangle).**
**	****-> MODIS+MISR surface BRDF**
**	****-> MODIS+MISR aerosols**
**	****-> CERES+MISR+MODIS cloud-radiation in polar regions.**
**   ****-> CERES+MISR+MODIS high-resolution cloud radiative**
**       ****forcing**