Skip all navigation and jump to content Jump to site navigation
NASA Logo - Goddard Space Flight Center

+ NASA Homepage

    
Goddard Space Flight Center
About MODIS News Data Tools /images2 Science Team Science Team Science Team

   + Home
ABOUT MODIS
MODIS Publications Link
MODIS Presentations Link
MODIS Biographies Link
MODIS Science Team Meetings Link
 

 

 

Redemann, J, Zhang, Q, Schmid, B, Russell, PB, Livingston, JM, Jonsson, H, Remer, LA (2006). Assessment of MODIS-derived visible and near-IR aerosol optical properties and their spatial variability in the presence of mineral dust. GEOPHYSICAL RESEARCH LETTERS, 33(18), L18814.

Abstract
Mineral dust aerosol is among the most difficult aerosol species to measure quantitatively from space. In this paper, we evaluate MODIS retrievals of spectral aerosol optical depth ( AOD) from the visible to the near- IR off the US West Coast using measurements taken by the NASA Ames Airborne Tracking Sunphotometer, AATS- 14, during the EVE ( Extended- MODIS-lambda Validation Experiment, 2004) campaign in April of 2004. In EVE, a total of 35 and 49 coincident over- ocean suborbital measurements at the nominal level- 2 retrieval scale of 10 km x 10 km were collected for Terra and Aqua, respectively. For MODIS- Terra about 80% of the AOD retrievals are within the estimated uncertainty, Delta tau = +/- 0.03 +/- 0.05 tau; this is true for both the visible ( here defined to include 466 - 855 nm) and near- IR ( here defined to include 1243 - 2119 nm) retrievals. For MODIS- Aqua about 45% of the AOD retrievals are within Delta tau = +/- 0.03 +/- 0.05 tau; the fraction of near- IR retrievals that fall within this uncertainty range is about 27%. We found an rms difference of 0.71 between the sunphotometer and MODIS- Aqua estimates of the visible ( 553 - 855 nm) angstrom ngstrom exponent, while the MODIS- Terra visible A ngstrom exponents show an rms difference of only 0.29 when compared to AATS. The cause of the differences in performance between MODIS- Terra and MODIS- Aqua could be instrument calibration and needs to be explored further. The spatial variability of AOD between retrieval boxes as derived by MODIS is generally larger than that indicated by the sunphotometer data.

DOI:
10.1029/2006GL026626

ISSN:
0094-8276

FirstGov logo Privacy Policy and Important Notices NASA logo

Curator: Brandon Maccherone
NASA Official: Shannell Frazier

NASA Home Page Goddard Space Flight Center Home Page