Observing soil moisture temporal variability under fluctuating climatic conditions
Hydrology and Earth System Sciences Discussions
The paper focuses on the observation of interannual and intra-annual climate variability impact on soil moisture temporal patterns and variation, for an experimental site located in Southern Italy and characterized by a typical Mediterranean climate. Analysed data consist of three years soil water content time series measured during the period 5 2004-2007, under intermediate (2004/2005), wet (2005/2006) and dry (2006/2007) climatological conditions. Results show that, for the case study,
... case study, interannual precipitation fluctuation highly impact the annual soil moisture cycle, modifying the number and length of characteristic periods revealed by the cycle patterns. Annual rainfall variation also affects the weight of the wet and dry soil moisture conditions, making the 10 distinction between preferred states more and more evident for increasing precipitation variability. Intra-annual precipitation fluctuation instead mainly impact soil moisture dynamic during the dry period of the year, shifting the position of the modes and the weight of the wet mode and nearly leading the dry mode to disappear for larger mean seasonal rainfall. Reported analyses would be a support and a premise for further 15 modeling implications. hypothesis. But soil moisture is one of the most difficult variables to estimate, because 936 HESSD 5, 2008 Abstract Introduction Conclusions References Tables Figures Back Close Full Screen / Esc Printer-friendly Version Interactive Discussion of its interaction with factors such as vegetation, soil types and topography (Wilson et al., 2005). Above these, climate variability acts on soil water content dynamics as the external driving force through non linear processes. The effect of climate characteristics on soil water balance turns into soil wetness dynamics that can be extremely different from each other. Grayson et al. (1997) dis-5 HESSD 5, 935-969, 2008 Abstract HESSD 5, 935-969, 2008 Abstract HESSD 5, 935-969, 2008 Abstract HESSD 5, 935-969, 2008 Abstract HESSD 5, 935-969, 2008 Abstract 5, 935-969, 2008 Abstract 5, 935-969, 2008 Abstract HESSD 5, 935-969, 2008 Abstract 5, 935-969, 2008 Abstract HESSD 5, 935-969, 2008 Abstract 5, 935-969, 2008 Abstract stimulating discussions.