Publication Details

Category Text Publication
Reference Category Journals
DOI 10.1002/2014WR015930
Title (Primary) Stochastic temporal disaggregation of monthly precipitation for regional gridded data sets
Author Thober, S.; Mai, J.; Zink, M.; Samaniego, L. ORCID logo
Source Titel Water Resources Research
Year 2014
Department CHS
Volume 50
Issue 11
Page From 8714
Page To 8735
Language englisch
Keywords precipitation; downscaling; weather generator; covariance matrix; sequential Gaussian sampling; multiplicative cascade
UFZ wide themes RU5;
Abstract Weather generators are used for spatio-temporal downscaling of climate model outputs (e.g., precipitation and temperature) to investigate the impact of climate change on the hydrological cycle. In this study, a multiplicative random cascade model is proposed for the stochastic temporal disaggregation of monthly to daily precipitation fields, which is designed to be applicable to grids of any spatial resolution and extent. The proposed method uses stationary distribution functions that describe the partitioning of precipitation throughout multiple temporal scales (e.g., weekly and bi-weekly scale). Moreover, it explicitly considers the intensity and spatial covariance of precipitation in the disaggregation procedure, but requires no assumption about the temporal relationship and spatial isotropy of precipitation fields. A split sampling test is conducted on a high-resolution (i.e., 4×4 km2 grid) daily precipitation data set over Germany (≈ 357 000 km2) to assess the performance of the proposed method during future periods. The proposed method has proven to consistently reproduce distinctive location dependent precipitation distribution functions with biases less than 5% during both a calibration and evaluation period. Furthermore, extreme precipitation amounts and the spatial and temporal covariance of the generated fields are comparable to those of the observations. Consequently, the proposed temporal disaggregation approach satisfies the minimum conditions for a precipitation generator aiming at the assessment of hydrological response to climate change at regional and continental scales or for generating seamless predictions of hydrological variables.
Persistent UFZ Identifier
Thober, S., Mai, J., Zink, M., Samaniego, L. (2014):
Stochastic temporal disaggregation of monthly precipitation for regional gridded data sets
Water Resour. Res. 50 (11), 8714 - 8735 10.1002/2014WR015930