Journal cover Journal topic
Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
Journal topic

Journal metrics

IF value: 5.414
IF5.414
IF 5-year value: 5.958
IF 5-year
5.958
CiteScore value: 9.7
CiteScore
9.7
SNIP value: 1.517
SNIP1.517
IPP value: 5.61
IPP5.61
SJR value: 2.601
SJR2.601
Scimago H <br class='widget-line-break'>index value: 191
Scimago H
index
191
h5-index value: 89
h5-index89
Volume 9, issue 21
Atmos. Chem. Phys., 9, 8211–8221, 2009
https://doi.org/10.5194/acp-9-8211-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.
Atmos. Chem. Phys., 9, 8211–8221, 2009
https://doi.org/10.5194/acp-9-8211-2009
© Author(s) 2009. This work is distributed under
the Creative Commons Attribution 3.0 License.

  03 Nov 2009

03 Nov 2009

Direct measurements of the effect of biomass burning over the Amazon on the atmospheric temperature profile

A. Davidi1, I. Koren1, and L. Remer2 A. Davidi et al.
  • 1Department of Environmental Sciences, Weizmann Institute, Rehovot, Israel
  • 2NASA Goddard Space Flight Center, Greenbelt, Maryland, USA

Abstract. Aerosols suspended in the atmosphere interact with solar radiation and clouds, thus change the radiation energy fluxes in the atmospheric column. In this paper we measure changes in the atmospheric temperature profile as a function of the smoke loading and the cloudiness, over the Amazon basin, during the dry seasons (August and September) of 2005–2008. We show that as the aerosol optical depth (AOD) increases from 0.02 to a value of ~0.6, there is a decrease of ~4°C at 1000 hPa, and an increase of ~1.5°C at 850 hPa. The warming of the aerosol layer at 850 hPa is likely due to aerosol absorption when the particles are exposed to direct illumination by the sun. The large values of cooling in the lower layers could be explained by a combination of aerosol extinction of the solar flux in the layers aloft together with an aerosol-induced increase of cloud cover which shade the lower atmosphere. We estimate that the increase in cloud fraction due to aerosol contributes about half of the observed cooling in the lower layers.

Publications Copernicus
Download
Citation
Altmetrics
Final-revised paper
Preprint