GEOG 3610 Lecture Notes - Lecture 7: Wavelength, Soil, Sea Surface Temperature
28 Mar 2018
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Document Summary
Gauge networks are usually too sparse thus missing storms. Radio detection and ranging: amount of reflectance is proportional to intensity of precipitation (as related to drop size. Spatial coverage: 200km effective range, total of 10,000km. Temporal coverage: 1h, 3h and storm duration are typical products. Accuracy increases of gauges are used, most useful for areal estimation. The relationship between radar reflectivity and rain rates follow a power-law relationship: z=a(r)b, r= the rainrate in mm/h, a,b: related to the intercept and slope on plot of rain rate vs. radar reflectivity (log-log) plot. Different regions have slightly different a and b values depending on characteristic drop sizes and type of storm: z= radar reflectivity (mm6/m3, z=reflectivity factor, d=drop diameter, n(d)= number of drops of given diameter per cubic meter. A logarithmic scale is used as the reflectivity (measured in db of z) vary from. The relationship varies with: time, location, season, type of storm, phase or shape of precipitation, distance from radar.
