Impact of terrestrial hydrology on L-A feedbacks and isotope signatures

陆地水文对 L-A 反馈和同位素特征的影响

• 批准号: 533950051
• 负责人: Professor Dr. Harald Kunstmann
• 金额: --
• 依托单位: Lehrstuhl für Regionales Klima und Hydrologie
• 依托单位国家: 德国
• 项目类别: Research Units
• 资助国家: 德国
• 项目状态: 未结题
• 来源: https://gepris.dfg.de/gepris/projekt/533950051?language=en
• 关键词: Impact; terrestrial; hydrology; feedbacks; isotope

L-A feedbacks depend on the exchange of water between the land and the atmosphere and more generally on L-A water pathways. A sound understanding of the processes related to L-A water pathways requires a joint measuring-modeling effort and the consideration of a great variety of both terrestrial and atmospheric variables, as they are offered by the LAFO observatory and LAFI. We will particularly consider stable water isotopologues and focus on the role of terrestrial hydrological processes on L-A feedbacks. The research objective of P9 is to improve our understanding of the relationship and interactions between groundwater, soil moisture in the unsaturated zone, ET partitioning, isotope signatures and L-A feedbacks, in the framework of LAFI objectives 2, 3, 4, E and S. The research hypotheses of P9 are that the consideration of isotopes in a L-A system model allows to better constrain the partitioning between E and T, reduce systematic errors in simulated ET, and more accurately characterize L-A coupling strength. Our studies will be performed with the isotope-enabled version of the fully coupled atmospheric-hydrological modeling system WRF-NoahMP-Gecros-Hydro-iso at turbulence permitting scales, which will allow to represent the isotopic fractionation processes associated with E and T at a relevant scale for comparison to in-situ isotope observation. The collaboration with P1, P4, P5, P6, P7 and P8 under the supervision of PS will allow to share expertise with LAFO datasets and feedback measures. P2 will provide remote sensing information to better constrain the model parameters related to plant transpiration. P3 will provide isotope observations in the land-vegetation-atmosphere system that will be crucial to evaluate and improve WRF-NoahMP-Gecros-Hydro-iso in terms of E – T partitioning. We will benefit from the work done in P4 and P7 to correctly use the Gecros crop modeling option in WRF-NoahMP-Gecros-Hydro-iso, and our modeled isotope results will feed back to the E – T partitioning analysis of P3 and P4. P9 will deliver model data to P10 as part of CCWG-DL. Our analysis of modeled L-A feedbacks with WRF-NoahMP-Gecros-Hydro-iso will be part of CCWG-MME.

L-A反馈取决于陆地和大气之间的水交换，更一般地说，取决于L-A水通道。要正确理解与L-A水通道有关的过程，需要联合进行测量-建模工作，并考虑LAFO观测站和LAFI提供的各种各样的陆地和大气变量。我们将特别考虑稳定的水同位素，并侧重于陆地水文过程中的作用，对L-A反馈。P9的研究目标是在LAFI目标2、3、4、E和S的框架内，提高我们对地下水、非饱和带土壤水分、ET分配、同位素特征和L-A反馈之间的关系和相互作用的理解。P9的研究假设是，在L-A系统模型中考虑同位素可以更好地约束E和T之间的分配，减少模拟ET的系统误差，并更准确地表征L-A耦合强度。我们的研究将进行同位素启用版本的完全耦合的大气水文模拟系统WRF-NoahMP-Gecros-Hydro-iso在湍流允许的尺度，这将允许代表同位素分馏过程与E和T在相关的规模进行比较，原位同位素观测。在项目事务处的监督下，与项目1、项目4、项目5、项目6、项目7和项目8的合作将有助于分享LAFO数据集和反馈措施方面的专门知识。P2将提供遥感信息以更好地约束与植物蒸腾相关的模型参数。P3将提供陆地-植被-大气系统中的同位素观测，这对于评估和改进WRF-NoahMP-Gecros-Hydro-iso的E-T分区至关重要。我们将受益于P4和P7中所做的工作，以正确使用WRF-NoahMP-Gecros-Hydro-iso中的Gecros作物建模选项，并且我们的建模同位素结果将反馈到P3和P4的E-T分配分析。作为CCWG-DL的一部分，P9将向P10提供模型数据。我们用WRF-NoahMP-Gecros-Hydro-iso对建模的L-A反馈的分析将是CCWG-MME的一部分。