结露时间与浅层土壤湿度相关特征

Relationship Between Soil Moisture and Dewfall Time

天气现象自动化观测系统,通过图像自动化识别技术,能自动观测地表结露天气现象,并能记录结露发生的时间.北京市平谷气象站安装了土壤湿度仪和天气现象自动化观测系统,通过统计分析平谷气象站2011年4 9月天气现象自动化观测系统得到的结露时间资料与浅层土壤湿度资料,得到结露时间与土壤湿度具有一定的相关关系,即0-10 cm层土壤湿度越大结露时间越早.相反,0-10 cm土壤湿度越小,结露时间越晚,当0-10 cm土壤湿度小于一定值后就不发生结露现象.为了进一步验证结露时间与土壤湿度具有一定的相关关系,分析了北京市怀柔、门头沟、朝阳、大兴和延庆等站结露时间与降水后日数的关系.

The Automated Weather Phenomenon Observation System can observe condensation and record the occurring time of weather phenomena by using image identification technology. The time of condensation occurrrsing and the data of soil moisture in the shallow soil layer are analyzed, and the relationship is established by using the data of the automatedic present weather observation system and the soil moisture observation equipment installed at Pinggu Station in Beijing from April to September in 2011. The condensation phenomenon appears earlier when the soil moisture of 0 to 10 cm layer is higher. On the contrary, the condensation phenomenon appears later when the soil moisture of 0 to 10 cm layer is lower, and the condensation phenomenon does not appear when the soil moisture of 0 to 10 cm layer is too low. In order to everify the the certain relationship between the condensation time and soil moisture, the relationship between the condensation time and the number of days after the rainfall in Huairou, Mentougou, Chaoyang, Daxing, and Yanqing stations of Beijing are analyzed.