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投稿时间：2014-01-02 修订日期：2014-10-30
投稿时间：2014-01-02 修订日期：2014-10-30
中文摘要: 根据从国家气象信息中心实时资料数据库读取的自动土壤水分监测资料，计算出各个测站相应的土壤容重、田间持水量、凋萎湿度数据。在具体的业务实践中,参照土壤最大吸湿量数值，将6%作为土壤相对湿度的低值异常阈值；参照土壤饱和含水量数值，将190%作为土壤相对湿度的高值异常阈值；参照土壤水分日变化特点，初步将24 h变化幅度0.1%作为10和20 cm土层土壤相对湿度监测异常的变化阈值。具体分析代表站实测土壤相对湿度随时间的变化幅度，认为在土壤水分上升过程中的小时之间变化幅度应小于土壤饱和含水量（%）与前一监测数据的差值；土壤相对湿度>100%时的下降幅度应小于土壤饱和含水量（%）减去95%；土壤相对湿度≤100%时的下降幅度应小于5%。
中文关键词: 土壤水分， 自动观测， 异常值阈值
Abstract:According to the automatic soil moisture monitoring data read from the database of National Meteorological Information Centre (NMIC), the soil bulk density, field capacity and wilting moisture of each station are calculated. In the operational practice, according to the soil maximum hygroscopicity, the lowest threshold of the relative soil moisture is set to be 6%. According to the saturated soil moisture, the top threshold of the relative soil moisture is set to be 190%. According to the diurnal variation characteristics of the soil moisture, the diurnal variation amplitude of the relative soil moisture of 10 cm and 20 cm soil layer is set to 0.1%. The variation range of relative soil moisture with time of representative stations is analyzed. The results show that in the increasing stage of soil moisture, the variation amplitude between hours should be less than the difference of the saturated soil moisture (%) with the previous monitoring data. When the relative soil moisture is larger than 100%, the decline range should be less than the saturated soil moisture (%) minus 95%. And when the relative soil moisture is less than 100%, the decline range should be less than 5%.
文章编号： 中图分类号： 文献标志码：
基金项目:公益性行业(气象)科研专项(GYHY201306045和GYHY201106027)共同资助
| Author Name | Affiliation |
| WANG Liangyu | National Meteorological Centre, Beijing 100081 |
| HE Yanbo | National Meteorological Centre, Beijing 100081 |
引用文本：
王良宇,何延波,2015.自动土壤水分观测数据异常值阈值研究[J].气象,41(8):1017-1022.
WANG Liangyu,HE Yanbo,2015.Research on Outlier Threshold of Automatic SoilMoisture Observation Data[J].Meteor Mon,41(8):1017-1022.
王良宇,何延波,2015.自动土壤水分观测数据异常值阈值研究[J].气象,41(8):1017-1022.
WANG Liangyu,HE Yanbo,2015.Research on Outlier Threshold of Automatic SoilMoisture Observation Data[J].Meteor Mon,41(8):1017-1022.