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MODELING

Estimating Daily Dew Point Temperature for the Northern Great Plains Using Maximum and Minimum Temperature

^a High Plains Regional Clim. Cent., 242 L.W. Chase Hall, Univ. of Nebraska, Lincoln, NE 68583-0728
^b Dep. of Geogr. and Geol. and Kentucky Clim. Cent., Western Kentucky Univ., Bowling Green, KY 42101

^* Corresponding author (rezaul.mahmood{at}wku.edu)

Received for publication June 15, 2001. Dew point temperature (T_d) is a precise measure of atmospheric moisture. A significant number of models for studying crop–climate interactions and earth processes require daily T_d as an input. However, limited availability of T_d data is a major barrier for applications of these models. In this paper, we present a daily T_d estimation method for the northern Great Plains (NGP). The daily T_d estimation method presented here requires daily maximum, minimum, and mean temperature data. Data from six sites in the NGP were used for the study. These sites record hourly T_d data from relative humidity. Length of the time series is 14 yr (1986–1999). Four different regression-based approaches were adopted and applied to all sites. Eventually, the best method was adopted based on its performance. The model evaluation statistics show that the selected model performs satisfactorily for these six sites. For example, root mean square error (RMSE), mean absolute error (MAE), and d index (ranges between 0 and 1, where 1 indicates no model error) values for North Platte, NE, application are 3.23, 2.55, and 0.97, respectively. The selected method was further applied to five additional locations in the NGP, and again it performed satisfactorily. For example, RMSE, MAE, and d index values for McCook, NE, application are 2.6, 2.0, and 0.98, respectively. From the model evaluation, we conclude that the model performed satisfactorily and will be quite useful in estimating T_d.

Abbreviations: MAE, mean absolute error • NGP, northern Great Plains • PET, potential evapotranspiration • QC, quality control • RH, relative humidity • RMSE, root mean square error • T_d, dew point temperature

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