- Conference date: 3–8 August 2008
- Location: Foz do Iguaçu (Brazil)
An intensive measurement campaign aiming to study Photosynthetically Active Radiation profiles inside the canopy at the Amazon Forest took place during 2007 biomass burning season, from 22 August to 30 October. During this period, aerosol optical properties were monitored using distinct radiometers: a Multi‐Filter Rotating Shadowband Radiometer (MFRSR), the AERONET sunphotometer, a handheld Microtops sunphotometer and Moderate Imaging Spectrometer (MODIS) aboard Terra and Aqua satellites. The Aerosol Optical Depth (AOD) varied strongly during the campaign with the daily average at 670 nm reaching values from 0.5 to 3.0. Ångström coefficient (α) calculated with AOD at 670 and 870 nm increase from 1.5, before the burning season, to 2.0 as a result of an increase of fine particles into the atmosphere. In early October, the AOD decreased and, as a consequence of the increasing frequency of rain events, AOD went back to the levels observed before burning season. Despite the fact that the distance of AERONET sunphotometer from the experimental site was 80 km, the retrievals obtained from all ground‐based radiometers were consistent and showed good agreement. On the other hand, MODIS retrievals overestimated the AOD during high aerosol concentration when compared with ground‐based radiometers.
MOST READ THIS MONTH
MOST CITED THIS MONTH
Article metrics loading...