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Estudo experimental das características da resposta da radiação micro-ondas da banda L do solo negro sob condições de congelamento

  • role： First author第一作者
  • Affiliation：

    School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

  • Email：845480611@qq.com
  • Introduction：孙孟琦，研究方向为冻土遥感。E-mail：845480611@qq.com
SUN Mengqi1,  
  • role： Corresponding author通信作者
  • Affiliation：

    School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

  • Email：kou_xiaokang@163.com
  • Introduction：寇晓康，研究方向为微波遥感。E-mail：kou_xiaokang@163.com
KOU Xiaokang1*,  
  • Affiliation：

    Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China

JIANG Tao2,  
  • Affiliation：

    School of Civil Engineering, Shijiazhuang Tiedao University, Shijiazhuang 050043, China

JIN Mengjie1,  
  • Affiliation：

    Institute of Geographical Sciences, Hebei Academy of Sciences, Shijiazhuang 050011, China

YAN Shuang3

Resumo

Na detecção de parâmetros congelados, a banda L possui maior capacidade de penetração, apresentando vantagens em relação a outras bandas de micro-ondas. Atualmente, os estudos aprofundados sobre a resposta da radiação micro-ondas na banda L são relativamente escassos, e as características da resposta da radiação micro-ondas do solo sob condições de congelamento ainda precisam ser esclarecidas. Para isso, este estudo focou-se no solo negro típico da região de permafrost do nordeste, realizando experimentos de proximidade no inverno natural com um radiómetro micro-ondas de dupla polarização na banda L, frequência de 1,414 GHz, em solos negros com diferentes teores de água iniciais. Por meio dos resultados experimentais, analisou-se a variação da profundidade da resposta da radiação micro-ondas do solo negro durante e após o processo de congelamento. Os resultados indicam que, durante o congelamento, a profundidade de resposta da banda L para solos com 10% e 30% de teor de água é maior que 5 cm, e o teor de água do solo ainda exerce papel dominante na temperatura de brilho. Além disso, após o congelamento, o teor de água inicial influencia a profundidade da resposta da radiação micro-ondas da banda L ao afetar o teor de água não congelada: para solo negro com teor inicial de água de 0% (solo frio) e 10%, a profundidade da resposta micro-ondas após congelamento está entre 100—105 cm e 50—60 cm, respectivamente; para teor inicial de água de 20% e 30%, a profundidade pós-congelamento é de 35—50 cm e 25—35 cm, respectivamente. Além disso, este estudo confirmou que, sob mesmas condições de temperatura e teor de água, a profundidade da resposta da radiação micro-ondas do permafrost é maior que a profundidade de penetração calculada com base no modelo de Ulaby et al. (1981). Em resumo, as conclusões deste estudo possuem importante valor de referência no campo da inversão remota de parâmetros do permafrost.

Palavras-chave

radiómetro de micro-ondas;profundidade de resposta;banda L;permafrost;solo negro

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