Feasibility of the Lapse Rate Prediction at an Hourly Time Interval

Title & Authors
Feasibility of the Lapse Rate Prediction at an Hourly Time Interval
Kim, Soo-ock; Yun, Jin I.;

Abstract
Temperature lapse rate within the planetary boundary layer shows a diurnal cycle with a substantial variation. The widely-used lapse rate value for the standard atmosphere may result in unaffordable errors if used in interpolating hourly temperature in complex terrain. We propose a simple method for estimating hourly lapse rate and evaluate whether this scheme is better than the conventional method using the standard lapse rate. A standard curve for lapse rate based on the diurnal course of temperature was drawn using upper air temperature for 1000hPa and 925hPa standard pressure levels. It was modulated by the hourly sky condition (amount of clouds). In order to test the reliability of this method, hourly lapse rates for the 500-600m layer over Daegwallyeong site were estimated by this method and compared with the measured values by an ultrasonic temperature profiler. Results showed the mean error $\small{-0.0001^{\circ}C/m}$ and the root mean square error $\small{0.0024^{\circ}C/m}$ for this vertical profile experiment. An additional experiment was carried out to test if this method is applicable for the mountain slope lapse rate. Hourly lapse rates for the 313-401m slope range in a complex watershed (`Hadong Watermark 2`) were estimated by this method and compared with the observations. We found this method useful in describing diurnal cycle and variation of the mountain slope lapse rate over a complex terrain despite larger error compared with the vertical profile experiment.
Keywords
Lapse rate;Mountain slope;Diurnal temperature cycle;Temperature interpolation;
Language
Korean
Cited by
1.
Improving the Usage of the Korea Meteorological Administration's Digital Forecasts in Agriculture: V. Field Validation of the Sky-condition based Lapse Rate Estimation Scheme, Korean Journal of Agricultural and Forest Meteorology, 2016, 18, 3, 135
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