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Last modified
7/14/2009 5:02:36 PM
Creation date
5/20/2009 3:40:52 PM
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UCREFRP
UCREFRP Catalog Number
9568
Author
Resource Consultants Inc.
Title
Sediment Transport Studies of the Little Snake, Yampa, and Green River Systems.
USFW Year
1991.
USFW - Doc Type
Fort Collins, CO.
Copyright Material
NO
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<br />-3/2 <br /> <br />[ ~ (Xi - X)' IN ] [ ~ (Xi - X)' IN] <br /> <br />(6/N) 1/2 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br />I <br /> <br />Monthly values of temperature, precipitation, and PHDI from 1895 through 1989 were obtained <br />on magnetic tape from NCDC. These monthly values are calculated by NCDC using all available climate <br />stations within a division. All stations are given equal weight. <br /> <br />Different observers within a division take their measurements at different times of the day and <br />these differences can bias the divisional temperature records. To remove these potential biases, NCDC <br />has rehabilitated the data and adjusted each individual station to reflect an observation time of midnight. <br />The correction factors were not determined for each station, but, instead by taking a representative sample <br />of stations from around the country during 6 different years in the record. These correction factors were <br />then incorporated into a model which corrects the divisional temperature record based upon the latitude <br />and longitude of the centroid of the climate division. All temperature data used in this study -- and thus <br />the related PHDI -- were corrected using this method. Using the magnetic tapes obtained from NCDC, <br />data were extracted for the six climate divisions in question. <br /> <br />4.5.3 Analvtical Procedures <br /> <br />The following analyses were conducted on the temperature, precipitation, and Palmer <br />Hydrological Drought Index (PHDI) values: <br /> <br />1. All monthly data were annualized by computing the arithmetic mean of the twelve <br />monthly values; the annual values are presented in Appendix F. <br /> <br />2. A composite, area-wide value of each variable was computed for each year by averaging <br />the data from the six climate divisions. <br /> <br />3 The annual values, extending from 1895 through 1989, were checked for normality (a <br />Gaussian distribution) using the standardized coefficients of skewness and kurtosis <br />computed as: <br /> <br />z = <br />1 <br /> <br />(24 / N) 1/2 <br /> <br />I <br />I <br />I <br />I <br />I <br />I <br />, <br /> <br />and <br /> <br />{[ ~(Xi-x)4/N][ ~(Xi-X)'IN f}-3 <br /> <br />z - <br />2- <br /> <br />where X_is the mean of the xi values and N is the number of years of record (N =96). If <br />the absolute value of zl or z2 exceeds 1.99, a statistically significant deviation from <br />normality is confrrmed at the 0.95 level of confidence. <br /> <br />4-10 <br />
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