منابع مشابه
Occurrence of Pesticides in Rain and Air in Urban and Agricultural Areas
In April 1995, the U.S. Geological Survey began a study to determine the occurrence and temporal distribution of 49 pesticides and pesticide metabolites in air and rain samples from an urban and an agricultural sampling site in Mississippi. The study was a joint effort between the National WaterQuality Assessment and the Toxics Substances Programs and was part of a larger study examining the oc...
متن کاملSuppression of rain and snow by urban and industrial air pollution
Direct evidence demonstrates that urban and industrial air pollution can completely shut off precipitation from clouds that have temperatures at their tops of about -10 degrees C over large areas. Satellite data reveal plumes of reduced cloud particle size and suppressed precipitation originating from major urban areas and from industrial facilities such as power plants. Measurements obtained b...
متن کاملPesticides in Mississippi air and rain: a comparison between 1995 and 2007.
A variety of current-use pesticides were determined in weekly composite air and rain samples collected during the 1995 and 2007 growing seasons in the Mississippi Delta (MS, USA) agricultural region. Similar sampling and analytical methods allowed for direct comparison of results. Decreased overall pesticide use in 2007 relative to 1995 generally resulted in decreased detection frequencies in a...
متن کاملVariation in spatial pattern of criteria air pollutants before and during initial rain of monsoon.
Spatial patterns of various criteria air pollutants, like SO2, NO2, O3, and TSP were studied at Shahdara National Ambient Air Quality Monitoring station in Delhi (India) in July 1999. The minimum pollutant concentrations were observed during morning hours, whereas the highest concentrations were found during the late night hours, which seem to be related with the vehicular emission. Pre-monsoon...
متن کاملDynamic Effects of Airborne Water Droplets on Air-Sea Interactions: Sea-Spray and Rain
We anticipate that this research will lead to an improved understanding of water droplet mediated airsea fluxes with implications in basic research, satellite or land-based remote sensing of the ocean surface, electromagnetic communication, military surveillance, and weather forecasting. We foresee that this work will become the initial stages of a long-term effort involving further development...
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ژورنال
عنوان ژورنال: Nature
سال: 1872
ISSN: 0028-0836,1476-4687
DOI: 10.1038/006325a0