A new snow module improves predictions of the isotope-enabled MAIDENiso forest growth model

编号 030035701

推送时间 20220822

研究领域 森林经理 

年份 2022 

类型 期刊 

语种 英语

标题 A new snow module improves predictions of the isotope-enabled MAIDENiso forest growth model

来源期刊 GEOSCIENTIFIC MODEL DEVELOPMENT

期 第357期

发表时间 20220309

关键词 TREE-RING CELLULOSE;  BLACK SPRUCE TREES;  CARBON-DIOXIDE;  NORTHERN QUEBEC;  TEMPERATURE RECONSTRUCTION;  NORTHEASTERN CANADA;  STABLE-ISOTOPES;  OXYGEN ISOTOPES;  CLIMATE-CHANGE;  RADIAL GROWTH; 

摘要 The representation of snow processes in forest growth models is necessary to accurately predict the hydrological cycle in boreal ecosystems and the isotopic signature of soil water extracted by trees, photosynthates and tree-ring cellulose. Yet, most process-based models do not include a snow module; consequently, their simulations may be biased in cold environments. Here, we modified the MAIDENiso model to incorporate a new snow module that simulates snow accumulation, melting and sublimation, as well as thermal exchanges driving freezing and thawing of the snow and the soil. We tested these implementations in two sites in eastern and western Canada for black spruce (Picea mariana (Mill.) B.S.P.) and white spruce (Picea glauca (Moench) Voss) forests, respectively. The new snow module improves the skills of the model to predict components of the hydrological cycle. The MAIDENiso model is now able to reproduce the spring discharge peak and to simulate stable oxygen isotopes in tree-ring cellulose more realistically than in the original snow-free version of the model. The new implementation also results in simulations with a higher contribution from the source water on the oxygen isotopic composition of the simulated cellulose, leading to more accurate estimates of cellulose isotopic composition. Future work may include the development of inverse modelling with this new version of MAIDENiso to produce robust reconstructions of the hydrological cycle and isotope processes in cold environments.

服务人员 付贺龙

服务院士 唐守正

PDF文件 浏览全文