TY - JOUR
T1 - A Numerical Method to Generate High Temporal Resolution Precipitation Time Series by Combining Weather Radar Measurements with a Nowcast Model
AU - Nielsen, Jesper Ellerbæk
AU - Thorndahl, Søren Liedtke
AU - Rasmussen, Michael R.
PY - 2014
Y1 - 2014
N2 - The topic of this paper is temporal interpolation of precipitation observed by weather radars. Precipitation measurements with high spatial and temporal resolution are, in general, desired for urban drainage applications. An advection-based interpolation method is developed which uses methods for vector field estimation already known from short-term weather radar nowcasting. However, instead of forecasting the weather radar rainfall, the proposed interpolation method exploits the advection of the rainfall in the interpolation. The interpolated rainfall fields are validated by measurements at ground level from laser disdrometers. The proposed interpolation method performs better when compared to traditional interpolation of weather radar rainfall where the radar observation is considered constant in time between measurements. It is demonstrated that the advection-based interpolation method reconstructs a significant part of the temporal variations of the rainfall. Moreover, the interpolated precipitation fields estimate accumulated rain depths more accurately.
AB - The topic of this paper is temporal interpolation of precipitation observed by weather radars. Precipitation measurements with high spatial and temporal resolution are, in general, desired for urban drainage applications. An advection-based interpolation method is developed which uses methods for vector field estimation already known from short-term weather radar nowcasting. However, instead of forecasting the weather radar rainfall, the proposed interpolation method exploits the advection of the rainfall in the interpolation. The interpolated rainfall fields are validated by measurements at ground level from laser disdrometers. The proposed interpolation method performs better when compared to traditional interpolation of weather radar rainfall where the radar observation is considered constant in time between measurements. It is demonstrated that the advection-based interpolation method reconstructs a significant part of the temporal variations of the rainfall. Moreover, the interpolated precipitation fields estimate accumulated rain depths more accurately.
KW - Weather Radar
KW - Quantitative Precipitation Estimates
KW - Temporal interpolation of radar data
KW - Laser Disdrometers
KW - Weather Radar
KW - Quantitative Precipitation Estimates
KW - Temporal interpolation of radar data
KW - Laser Disdrometers
U2 - 10.1016/j.atmosres.2013.10.015
DO - 10.1016/j.atmosres.2013.10.015
M3 - Journal article
SN - 0169-8095
VL - 138
SP - 1
EP - 12
JO - Atmospheric Research
JF - Atmospheric Research
IS - March
ER -