Highlights SOC stocks were modelled using legacy data, environmental factors and geostatistics. The importance of SOC stock drivers differed in the top and subsoil. Effects of drivers on agricultural SOC stocks vary spatially at the regional scale. SOC stocks in Catalan agricultural soils contain 4.88 ± 0.89 kg/m 2 .  A baseline framework was established to design climate change mitigation strategies.

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Water resources in high mountain karst aquifers are usually characterized by high rainfall, recharge and discharge that lead to the sustainability of the downstream ecosystems. Nevertheless, these hydrological systems are vulnerable to the global change impact. The mean transit time (MTT) is a key parameter to describe the behavior of these hydrologic systems and also to assess their vulnerability. This work is focused on estimating MTT by using environmental tracers in the framework of high-mountain karst systems with a very thick unsaturated zone (USZ). To this end, it is adapted to alpine zones a methodology that combines a semi-distributed rainfall-runoff model to estimate recharge time series, and a lumped-parameter model to obtain ΜΤΤ. The methodology has been applied to the Port del Comte Massif (PCM) hydrological system (Southeastern Pyrenees, NE Spain), a karst aquifer system with an overlying1000 m thick USZ. Six catchment areas corresponding to most important springs of the system are considered. The obtained results show that hydrologically the behavior of the system can be described by an exponential flow model (EM), with MTT ranging between 1.9 and 2.9 years. constant recharge rate along time, which is the easiest and most applied -parameter models.Response to Reviewers: COMMENTS FROM REVIEWERS: Reviewer #1 General commentsThee paper by Herms et al. with title: "Contribution of isotopic research techniques to characterize high mountain-Mediterranean karst aquifers: The Port del Comte (Eastern Pyrenees) aquifer." provides an interesting study regarding the contribution of isotopic research in karst aquifers. The concept is interest and the manuscript well written.Thank you very much for your kind comments However, I have a number of recommendations, which should be done before publication.

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