An overview of advances on moisture migration of the active layer in permafrost regions of the Qinghai-Tibetan Plateau
In this paper,we review the field observation and parameterization of active layer moisture in QTP.In general, the statistical analysis based on observation, cannot accurately obtain active layer moisture migration characteristics in larger spatial and temporal scale.Therefore,according to whether respectively considering unfrozen and frozen state,we put forward four categories of active layer moisture parameterization:1 ) Clapp-Hornberger formula based on soil water content;2 ) coupling Clapeyron equation and Clapp-Hornberger formula by soil temperature;3)introducing the blocking effect of ice;4)the generalization of Clapp-Hornberger formula modified by soil temperature and ice content. However,these schemes are not ideal,and their simulations for moisture migration in frozen period are range,still need to be further improved.
active layer moistureparameterizationland surface modelTibetan Plateau