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<br />given by Hogg et ale (1983) and He99li. et ale (1987). Sources of measurement <br /> <br />error have been estimated theoretically to be less than 15 percent by Westwater <br /> <br />(19.78). This ~stimate was confirme:d in field tests by Heggli et ale (1987).". <br /> <br />. ' <br />Sources of data contamination were due to rain or mixed phase ~recipitation <br /> <br />which obscured the measurement of cloud liquid. False signals could also be <br />caused by melting hydrometers and/or a water coated reflector. Periods when <br /> <br />melting occurred, or the reflector was wet, were removed from the data set prior <br /> <br />to this analysis. Ice crystals, on the other hand, h.ave no discernible effect <br /> <br />on the emissions by water vapor and liquid, whether it be falling or resting on <br /> <br />the reflector. For more details concerning the radiometer, the reader is <br /> <br />referred to Hogg et al. (1983). <br /> <br />The SCPP radiometer was programmed to average vapor and liquid measurements <br /> <br />over two minute intervals. The radiometer was located at Kingvale (KV), CA <br />(Fig. 2) and was pointed vertically during the SCPP. <br /> <br />B. Rawi nsondes <br /> <br />The SCPP typically had two rawinsonde stations in operatiori during a single <br />field season. The VIZ Acculok rawinsonde was used at Sheridan, CA (SH) and KV <br />for nearly the entire research period. The exception was during the 1986/87 <br />season when the Cross Chain Loran J~tmospheric Sounding System (CLASS) was used <br />(Lauritson et al., 1987). During 1986/87, the Sheridan launch site was moved <br /> <br />11.7 km southeast to Lincoln, CA to accomodate the CLASS system. Sheridan (or <br /> <br />Lincoln) in the Sacramento Valley, and Kingvale, near the Sierra crestline, have <br />a cross barrier align~ent, providing the boundary conditions of the physical <br /> <br />phenomencl brought about by the Si erra Nevada. <br /> <br />4 <br />