Daily total precipitation: ANUClimate 1.0, 0.01 degree, Australian Coverage, 1970-2014

Daily total precipitation for Australian continent between 1970-2014. Daily rainfall totals are useful for estimation of soil moisture for plant growth and surface runoff via soil water balance modelling. Modelled by expressing each daily value, including zero rainfall, as a normalised anomaly with respect to the gridded 1976-2005 mean for each month, as provided by ANUClimate_v1-0_rain_monthly-mean_0-01deg_1976-2005. The daily anomalies were interpolated by trivariate thin plate smoothing spline functions of longitude, latitude and vertically exaggerated elevation using ANUSPLIN Version 4.5. Station elevations were 0.05 degree local averages of grid values from the GEODATA 9 second DEM version 3 as provided by ANUClimate_v1-0_dem05_terrain_0-01deg. There was an average of 6384 Bureau of Meteorology data points per day between 1970 and 2014. The mean absolute value of all individual cross validation residuals provided by the spline analysis is 0.95 mm (50% of the overall mean). Extreme studentised residuals clearly identified data errors associated with unrecognised missing values, unrecognised accumulated values, and values recorded on the wrong (usually preceding) day. There were on average around 5 such extreme residuals per day. The rainfall occurrence of the individual cross validated days agrees with the rainfall occurrence of 91% of all days of record, where daily rainfall occurrence is defined as daily rainfall exceeding 0.2 mm. A comprehensive assessment of the analysis and the factors contributing to the quality of the final interpolated monthly rainfall grids is in preparation.

本数据集涵盖1970年至2014年间澳大利亚大陆的逐日总降水量数据。逐日降雨量总量可借助土壤水量平衡模型，用于估算植物生长所需的土壤湿度与地表径流量。本数据集通过如下方式构建：将包括零降雨日在内的所有日降雨量值，标准化为相对于ANUClimate_v1-0_rain_monthly-mean_0-01deg_1976-2005提供的1976-2005年逐月格点气候平均值的标准化距平。随后，采用ANUSPLIN Version 4.5软件，基于经度、纬度与垂直放大高程的三元薄板平滑样条函数，对逐日降水距平进行插值。站点高程数据采用ANUClimate_v1-0_dem05_terrain_0-01deg提供的GEODATA 9秒数字高程模型（Digital Elevation Model, DEM）版本3的0.05度格点局地平均值。1970年至2014年间，每日平均包含6384个澳大利亚气象局（Bureau of Meteorology）的观测数据点。样条分析得到的所有单个交叉验证残差的平均绝对值为0.95毫米，为总体均值的50%。极端学生化残差可有效识别与未被发现的缺测值、未被识别的累加值以及记录日期错误（通常为提前记录）相关的数据误差，每日平均约存在5个此类极端残差。经交叉验证的逐日降水发生情况（将日降雨量超过0.2毫米定义为降水发生）与91%的实测记录日降水发生情况一致。关于本次插值分析及影响最终逐月降水格网质量的相关因素的全面评估工作正在筹备中。