Correlation Analyses on Total Precipitable Water andSurface Dew Point Temperature over Hefei

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Plateau Meteorology ›› 2009, Vol. 28 ›› Issue (2) : 452-457.

Correlation Analyses on Total Precipitable Water andSurface Dew Point Temperature over Hefei

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Abstract

Based on four\|year\|observation using ground\|based dual\|channel microwave radiometer WVR-1100 and temperature/humidity sensors at Hefei station, the empirical relation between surface dew point tdand total precipitable water Won thebasis of mean daily values have been statistically analyzed. The calculated results show that the correlation coefficient r between surface tdand the natural logarithm of Wis higher than 0.90 and the value of empirical coefficients aand b are -0.521 and 0.0901℃-1, respectively, mirroring particularity of theclimate condition of Hefei region. The monthly correlation coefficients range from 0.120 to 0.813 and seasonal values from 0.740 to 0.865, with the highest value in fall and lowest in summer. The degree of correlation is excellent in fall and winter months, but weaker in late spring and summer months, especially for July and August. The monthly variations of aare gentlyduring spring, fall and winter months, but acutelyduring the summer months. It′s annual variation is nearly reverseto that of monthly correlation coefficient. Proposed that it is not advisableto calculate W using surfacetdbased on empirical calculating model on monthly scale.

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Hefei station / Total precipitable w / Surface dew point te / Correlation

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. Correlation Analyses on Total Precipitable Water andSurface Dew Point Temperature over Hefei. Plateau Meteorology. 2009, 28(2): 452-457

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