Cloud Seeding Research Essays

1082 Words Feb 11th, 2012 5 Pages
Cloud Seeding Research
As early as the 1940s, scientists and engineers have been conducting experimental trials, analyzing statistics, and searching to find specific methods that will result in increasing and augmenting natural rainfall and snowfall within different geographical areas of our planet. Despite extensive research over the years, up to only a few years ago statistical analysis of these weather and precipitation modification efforts commonly referred to as cloud seeding had not produced the scientifically convincing proof that is required to reach pertinent and reasonably accurate conclusions about the true effectiveness of cloud seeding efforts. This has changed with recent advances in instrumentation technology, additional
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Internationally, Australia and in particular Tasmania have been at the forefront of cloud seeding research and the most recent use of different statistical procedures in analyzing data from cloud seeding experiments (Morrison, Siems, Manton, & Nazarov, 2009).
In analyzing the data collected from cloud seeding research over Tasmania, three main statistical procedures or methods were used. The first method was the minimalistic approach of taking the arithmetic mean of average rainfall obtained from rainfall gauges in areas where seeding had taken place denoted as CISRO and HECA target areas and where no seeding took place, denoted as W, NW, NE, and SE controls. These results were filtered using three different levels of 25%, 50%, and 75% of the total operating time from 1960 to 2005 because additional rain gauges were installed over this extensive period of time as a way of trying to eliminate unusual data results. In an attempt to further eliminate possible unusual or skewed results gauges only monitored by government meteorologists were used, months only in which 60 or more cloud seedings occurred were included, and additionally gauges only that had complete readings for the entire month were used (Morrison, Siems, Manton, & Nazarov, 2009). As second statistical method of analyzing the data was the use of a double ratio analysis. This is a traditional technique that is

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