Abstract
Abstract. The stochastic weather generator CLIGEN can simulate long-term weather sequences as input to WEPP for erosion predictions. Its use, however, has been somewhat restricted by limited observations at high spatial–temporal resolutions. Long-term daily temperature, daily, and hourly precipitation data from 2405 stations and daily solar radiation from 130 stations distributed across mainland China were collected to develop the most critical set of site-specific parameter values for CLIGEN. Ordinary kriging (OK) and universal kriging (UK) with auxiliary covariables, i.e., longitude, latitude, elevation, and the mean annual rainfall, were used to interpolate parameter values into a 10 km×10 km grid, and the interpolation accuracy was evaluated based on the leave-one-out cross-validation. Results showed that UK generally outperformed OK. The root mean square error between UK-interpolated and observed temperature-related parameters was ≤0.88 ∘C (1.58 ∘F). The Nash–Sutcliffe efficiency coefficient for precipitation- and solar-radiation-related parameters was ≥0.87, except for the skewness coefficient of daily precipitation, which was 0.78. In addition, CLIGEN-simulated daily weather sequences using UK-interpolated and observed parameters showed consistent statistics and frequency distributions. The mean absolute discrepancy between the two sequences for temperature was <0.51 ∘C, and the mean absolute relative discrepancy for solar radiation, precipitation amount, duration, and maximum 30 min intensity was <5 % in terms of the mean and standard deviation. These CLIGEN parameter values at 10 km resolution would meet the minimum data requirements for WEPP application throughout mainland China. The dataset is available at http://clicia.bnu.edu.cn/data/cligen.html (last access: 20 May 2021) and https://doi.org/10.12275/bnu.clicia.CLIGEN.CN.gridinput.001 (Wang et al., 2020).
Highlights
Weather generators (WGs) are stochastic models that can generate arbitrarily long sequences of weather variables with statistical properties that are similar to observations for a specific location or area (Yin and Chen, 2020)
From the spatial distribution of daily precipitation in August we found a general decreasing trend from southeast to southwest (Fig. 4a–b)
The August rain belt is located in North and Northeast China, while the South China region is controlled by the subtropical high-pressure belt and experiences a summer drought
Summary
Weather generators (WGs) are stochastic models that can generate arbitrarily long sequences of weather variables with statistical properties that are similar to observations for a specific location or area (Yin and Chen, 2020). While global climate models (GCMs)/regional climate models (RCMs) have been used for climate projections, outputs from these models were often too coarse to meet the requirements of earth surface process models in terms of spatial–temporal resolutions and were biased compared with observations. Wang et al.: CLIGEN parameter regionalization for mainland China prior to earth surface model applications (Maraun and Widmann, 2018; Yin and Chen, 2020)
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