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 /images2 Science Team Science Team Science Team

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

 

 

Lohmann, U, Koren, I, Kaufman, YJ (2006). Disentangling the role of microphysical and dynamical effects in determining cloud properties over the Atlantic. GEOPHYSICAL RESEARCH LETTERS, 33(9), L09802.

Abstract
MODIS satellite data reveal that over the Atlantic Ocean ( 20 degrees S - 30 degrees N) in June - August 2002 indirect aerosol effects cause a decrease in the cloud top effective radius of stratiform clouds of 2.9 mu m and an increase in cloud fraction of 21%, when increasing the aerosol optical thickness (AOT) from the cleanest 5 percentile to an AOT of 0.2. Thus, indirect aerosol effects are responsible for 72% (- 8.8 W m(-2)) of the - 12.2 W m(-2) decrease in the shortwave radiation at the top-of-the atmosphere (TOA). Global climate model simulations with and without indirect aerosol effects confirm a decrease in TOA shortwave cloud forcing of - 9 W m(-2) over the Atlantic from the cleanest to the highest AOT due to indirect aerosol effects. While MODIS shows an increase in cloud fraction due to aerosols, in the model aerosols cause primarily an increase in cloud water. Thus, unlike the analysis from MODIS, the increase in cloud fraction with increasing AOT is dominated by changes in dynamical regimes, not by aerosol indirect effects.

DOI:
10.1029/2005GL024625

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