Open AccessPerformance of various techniques in estimating missing climatological data over snowbound mountainous areas of Karakoram Himalaya
Author(s) -
Kanda Neha,
Negi H. S.,
Rishi Madhuri S.,
Shekhar M. S.
Publication year - 2018
Publication title -
meteorological applications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 59
eISSN - 1469-8080
pISSN - 1350-4827
DOI - 10.1002/met.1699
Subject(s) - mean squared error , precipitation , standard deviation , mean absolute error , absolute deviation , statistics , linear regression , environmental science , climatology , regression , approximation error , missing data , scale (ratio) , mathematics , meteorology , geology , geography , cartography
Filling gaps in climate data concerning mountainous areas with high spatial variability is significantly important since gaps tend to decrease the accuracy of trend estimation. In this study, the performance of seven classical methods in estimating missing values of maximum temperature, minimum temperature and precipitation at different time scales, i.e. daily (with different cases of missing data), weekly, biweekly and monthly, over Karakoram Himalaya was evaluated. Four performance indicators, i.e. mean absolute error, root mean squared error, co‐efficient of efficiency and skill score, were used to evaluate the relative performance of the methods; the mean absolute error was preferred over the other three measures for selecting the best method. The results indicate that multiple linear regression using the least absolute deviation criterion is best suited for estimation of all variables at all temporal scales except monthly precipitation data. It was also found that, for any variable, the deviation from the observed values decreased with increasing time step, i.e. there was more deviation on a daily scale than monthly.