SISS model data and script

This resource is linked to the following manuscript: Lutz et al.: How Important is Denitrification in Riparian Zones? Combining Endmember Mixing and Isotope Modeling to Quantify Nitrogen Removal Processes, in review for Water Resources Research This resource provides concentration and isotope data in a groundwater well field along a 2 km stream section in central Germany. We developed a mathematical model combining endmember mixing and isotope modeling to account for mixing of river water and groundwater, and quantify nitrate transformation at the study site (i.e., the SISS model). This enabled us to explicitly determine the extent of denitrification (as permanent nitrate removal process) and nitrate removal by additional processes associated with negligible isotope fractionation (e.g., plant uptake, microbial assimilation and dissimilatory nitrate reduction to ammonium) in the riparian system. Content: *the SISS model code *chloride and nitrate concentration data from the field site *nitrate and stable water isotope data from the field site本数据集关联以下手稿：Lutz 等：《河岸带反硝化作用的重要性如何？结合端元混合（endmember mixing）与同位素建模（isotope modeling）量化氮去除过程》，该稿件已投稿至《Water Resources Research》并处于审稿阶段。 本数据集涵盖德国中部一段2km河段沿岸地下水井场的浓度与同位素数据。研究团队开发了一款结合端元混合与同位素建模的数学模型（SISS模型，SISS model），用于模拟河水与地下水的混合过程，并量化研究区域内的硝酸盐转化过程。借助该模型，研究人员可明确确定河岸系统中反硝化作用（denitrification）作为永久性硝酸盐去除过程的占比，以及由同位素分馏可忽略的其他过程（例如植物吸收（plant uptake）、微生物同化（microbial assimilation）以及硝酸盐异化还原为铵（dissimilatory nitrate reduction to ammonium）所导致的硝酸盐去除量。 数据集包含以下内容： * SISS模型代码 * 研究场地的氯化物与硝酸盐浓度数据 * 研究场地的硝酸盐与稳定水同位素数据