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相关概念视频

Precipitation Gravimetry01:03

Precipitation Gravimetry

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Precipitation gravimetry is based on converting an analyte into a sparingly soluble precipitate, which is separated by filtration and weighed. An ideal precipitate should be pure, insoluble, of known composition, and easily filtered from the reaction mixture.
In determining nickel by gravimetric analysis, a precipitant of ethanolic dimethylglyoxime is added to a hot nickel salt solution. This is quickly followed by the dropwise addition of dilute ammonia solution until precipitation occurs. A...
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Precipitation and Co-precipitation01:17

Precipitation and Co-precipitation

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Precipitation and coprecipitation methods can be used to separate a mixture of ions in a solution. In qualitative inorganic analysis, ions that form sparingly soluble precipitates with the same reagent are separated based on the differences in solubility products. For example, consider the separation of Cu(II) and Fe(II) ions by precipitation as insoluble sulfides. First, copper(II) sulfide is precipitated by the addition of acidic H2S, where the dissociation of H2S is suppressed. Adding H2S...
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In Situ Soil Moisture Sensors in Undisturbed Soils
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中国土壤湿度观测网络和时间序列数据集用于高分辨率卫星应用.

Chunmei Wang1,2, Xingfa Gu3,4, Xiang Zhou5,6

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中国中国中国中国.

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科学领域:

  • 地球和环境科学 地球和环境科学
  • 遥感 遥感 遥感 遥感
  • 土壤科学 土壤科学

背景情况:

  • 高质量的地面观测网络对于科学研究至关重要.
  • 准确的土壤湿度和温度数据对于各种应用至关重要.

研究的目的:

  • 在中国建立自动土壤观测网络 (SONTE-China),用于高分辨率卫星应用.
  • 测量基于像素和多层的土壤湿度和温度.
  • 验证土壤水分产品并提供用于预测和资源管理的数据.

主要方法:

  • 在中国的各种生态系统中部署了17个现场观测站.
  • 收集的土壤湿度和温度数据.
  • 分析数据的时间和空间特征.
  • 与观察到的土壤湿度相关联的哨兵-1 C 波段雷达信号.

主要成果:

  • 建立了SONTE-中国网络,拥有17个站点,覆盖各种生态系统.
  • 在校准后,基站土壤湿度的平均RMSE为0.027 m3/m3.
  • 观察到的数据与地理位置,季节性和降雨量保持一致.
  • 在Sentinel-1雷达数据和土壤湿度之间发现了强烈的相关性,在特定站点的RMSE<0.05 m3/m3.

结论:

  • SONTE-China提供可靠的土壤湿度和温度数据.
  • 该网络支持卫星衍生土壤水分产品的验证.
  • 对于天气预报,洪水预测,干旱监测和水资源管理来说,SONTE-China数据非常有价值.