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<br />re~I~Q1 9 <br />'..; ... .~ J __ _" <br /> <br /> 75 <br />- <br />:ll! <br />D <br />.... <br />Z <br />0 <br />en 50 <br />en <br />w <br />0:: <br />a.. <br />a.. <br />::> <br />en <br />z <br />0 25 <br />l- <br />e:( <br />0:: <br />0 <br />a.. <br />~ <br />w <br /> <br />95 % P (,1003 < b < .1383) <br />98 % P (.0412 < m < .0503) <br />SUPP.=.1193 + .0458 (AT) R2=.90 <br /> <br /> <br />o <br /> <br />2 <br /> <br />4 <br /> <br />10 <br /> <br />6 <br /> <br />8 <br /> <br />CHANGE <br /> <br />IN TEMPERATURE (DC) <br /> <br />Figure 8. Ten day runnIng average measurements of suppression/water temperature change funcdon. <br /> <br />and strong winds at a certain time each day could <br />make some values of pan temperature more <br />significant than others. <br /> <br />The cooled pans had less evaporation than the <br />normal pan. The normal evaporation pan therefore <br />had additional cooling introduced because of the <br />difference in evaporation. The cooled pans also had <br />significantly less heat loss through the outer pan <br />surface than the reference pan. These factors <br />would produce a smaller value of suppression. This <br />should not. however. imply that an error exists in <br />the suppression values. The experiment was <br />designed to measure evaporation as a function of <br />the surface water temperature. Therefore. so long <br />as differences in energy sources between pans are <br /> <br />reflected in terms of their influence on surface <br />water temperatures, no error in simulating the <br />phenomenon of interest should result. <br /> <br />Data Smoothing: The 9S percent confidence <br />interval established around the regression equa- <br />tion for suppression vs. the change in temperature <br />was considerably improved from the raw data to <br />the IO-day average data. This indicates that <br />evaporation estimates should be calculated on <br />mean values instead of daily values. The running <br />average values will not be sensitive to noise <br />resulting from short term weather fronts moving <br />through the area. <br /> <br />19 <br />