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1 Analyzing the Effect of Intraseasonal Meteorological 2 Variability and Land Cover on Aerosol-Cloud Interactions 3 during the Amazonian Biomass Burning Season 4 5
| Content Provider | Semantic Scholar |
|---|---|
| Author | Hoeve, J. E. Ten Remer, Lorraine A. Jacobson, M. Z. |
| Copyright Year | 2011 |
| Abstract | 11 High resolution aerosol, cloud, water vapor, and atmospheric profile data from the Moderate 12 Resolution Imaging Spectroradiometer (MODIS) are utilized to examine the impact of 13 aerosols on clouds during the Amazonian biomass burning season in Rondônia, Brazil. It is 14 found that increasing background column water vapor (CWV) throughout this transition 15 season between the Amazon dry and wet seasons exerts a strong effect on cloud properties. 16 As a result, aerosol-cloud correlations should be stratified by column water vapor to achieve a 17 more accurate assessment of the effect of aerosols on clouds. Previous studies ignored the 18 systematic changes to meteorological factors during the transition season, leading to possible 19 misinterpretation of their results. Cloud fraction is shown generally to increase with aerosol 20 optical depth (AOD) for both low and high values of column water vapor, whereas the 21 relationship between cloud optical depth (COD) and AOD exhibits a different relationship. 22 COD increases with AOD until AOD ~ 0.25 due to the first indirect (microphysical) effect. 23 At higher values of AOD, COD is found to decrease with increasing AOD, which may be due 24 to: (1) the inhibition of cloud development by absorbing aerosols (radiative effect) and/or (2) 25 a retrieval artifact in which the measured reflectance in the visible is less than expected from a 26 cloud top either from the darkening of clouds through the addition of carbonaceous biomass 27 burning aerosols or subpixel dark surface contamination in the measured cloud reflectance. If 28 (1) is a contributing mechanism, as we suspect, then a linear relationship between the indirect 29 effect and increasing AOD, assumed in a majority of GCMs, is inaccurate since these models |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/20110007946.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
