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<br />MARCH \987 <br /> <br />MARK HEGGLI, ROBERT M. RAUBER AND J. B. SNIDER <br /> <br />211 <br /> <br />TABLE 2. Comparison of data from two radiometers during six azimuthal scans. <br /> <br />$: <br />I! NOAA mean USBR mean RMS diff Mean ABS diff <br />II <br /> Scan No. points (cm) NOAASD (cm) USBR SD (cm) (mm) <br /> Vapor <br /> \ 287 2.70 0.05 2.70 0.06 0.07 0.06 <br /> 2 287 2.7\ 0.07 2.65 0.07 0.\0 0.08 <br /> 3 287 2.82 0.12 2.89 0.\8 0.\4 0.12 <br /> 4 287 2.6\ 0.\3 2.77 0.16 0.2\ 0.\8 <br /> 5 287 2.64 0.13 2.79 0.18 0.18 0.\5 <br /> 6 287 2.55 0.\5 2.62 0.20 0.\\ 0.08 <br /> All \722 2.67 0.\4 2.73 0.\8 0.\4 0.\\ <br /> Liquid <br /> \ 287 0.06 0.0\ 0.03 0.01 0.04 0.03 <br /> 2 287 0.10 0.04 0.10 0.04 0.04 0.03 <br /> 3 287 \.34 0.36 1.19 0.33 0.\8 0.\6 <br /> 4 287 0.89 0.39 0.79 0.37 0.12 0.10 <br /> 5 287 1.00 0.35 0.89 0.36 0.\2 0.10 <br /> 6 287 0.53 0.34 0.43 0.34 0.1\ 0.10 <br /> AU \722 0.65 0.55 0.57 0.5\ 0.\\ 0.09 <br /> Correlation coefficient, all scans: Vapor 0.7\ <br /> Liquid 0.99 <br /> <br />where Tm is the mean radiating temperature of the at- <br />mosphere, and 2.9 the cosmic background brightness <br />temperature. All temperatures are in Kelvin. The tem- <br />perature, T m, is estimated from the ensemble of <br />soundings used to calculate the statistical retrieval coef- <br />ficients. <br /> <br />Tipping curve calibrations are performed during pe- <br />. riods of clear weather when atmospheric conditions <br />are nearly homogeneous over the scanning volume. <br />During three occasions in CaSE, tipping curve cali- <br />brations were performed simultaneously by both ra- <br />diometers during a rawinsonde release. The release site <br /> <br />3.6 <br /> <br />3.4 <br /> <br /> 3.2 <br /> E 3.0 <br /> 2 <br />" a:: <br />0 <br /> a.. 2.8 <br /> ~ <br /> ex <br /> ex <br /> 0 2.6 <br /> z <br /> 2.4 <br /> <br />." . : :I<;~..:-:. <br />..... <br /> <br /> <br />/ . '. ~:~i~.~.;;.:/j~~~~::~.~:..~:; :~.'.':5:' <br />..~~;t_" '~J;. "'j';':". <br />".'";.';, ;,:~~~t...~.t' <br />''''i.'~rlo~~' !'~'.~(.)l:.l ~.::.:.:~.: <br />"'..,~~.:":II~... 'to <br />.......~CJts.--;~:1~1 .:y. "-.: <br />r.:~~"ti~~.. ~'i " <br />. ~: .~'.~. I::;:~'l)i:;' . <br />. ... ..... So., T. ^ . <br />'\::~:~~:':"':i~~' ~/'::'" <br />.. .:'..~" "." .:": ..: <br /> <br />2.2 <br /> <br />2.0 <br />2.0 <br /> <br />2.2 <br /> <br />2.4 <br /> <br />2.6 2.8 3.0 3.2 <br />US B R VAPOR (em) <br /> <br />3.4 <br /> <br />3.6 <br /> <br />FIG. 7. Scatter plot of all vapor points taken during the scanning <br />portion of the evaluation. <br />