Nutrient Cycles during the Permian-Triassic transition (NUC)

二叠纪-三叠纪过渡期间的养分循环（NUC）

• 批准号: 424859130
• 负责人: Professorin Dr. Tatiana Ilyina
• 金额: --
• 依托单位: Fachbereich Erdsystemwissenschaften
• 依托单位国家: 德国
• 项目类别: Research Units
• 财政年份: 2019
• 资助国家: 德国
• 起止时间: 2018-12-31 至 2023-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/424859130?language=en
• 关键词: Nutrient; Cycles; during; Permian; Triassic

Anthropogenic ocean warming is expected to result in increased ocean stratification and a decline in dissolved O2 in the ocean interior with implications for nutrient cycling, primary productivity, carbon cycling and marine habitats. The Permian–Triassic (P-T) time interval can be seen as an extreme case analogue to the modern climate change. It not only witnessed the most catastrophic mass extinction of the Phanerozoic, but was accompanied by 8 to 10° C low latitudinal warming and extensive global ocean anoxia. The project aims to reconstruct the effect of global warming on nutrient cycles and primary productivity in latest Permian to Early Triassic oceans and to document whether these changes may have had an impact on faunal extinction/recovery. Nitrogen, phosphorus and silicon cycles will be studied by combining geochemical proxy reconstruction with state-of the art Earth System modeling. We will test the hypotheses that (i) Early Triassic productivity was not limited by phosphate, (ii) ammonium was a main form of nutrient-N in Early Triassic oceans, and, (iii) higher ocean temperatures caused the Early Triassic chert gap. While the generated proxy records will represent the conditions in specific parts of the oceans, global biogeochemical modeling will provide a global view on nutrient distribution and availability with a relatively high spatial resolution. The proxy records as well as spatiotemporal nutrient reconstructions will be used by other Tersane 2.0 projects to test whether altered nutrient levels impacted on the extinction risk of organism, the body size of specific organisms or resulted in latitudinal extinction patterns during the P-T crisis.

人为海洋变暖预计将导致海洋分层增加和海洋内部溶解氧减少，从而对养分循环、初级生产力、碳循环和海洋生境产生影响。它不仅见证了显生宙最灾难性的大规模灭绝，而且还伴随着8至10°C的低纬度变暖和广泛的气候变化。该项目旨在重建全球变暖对二叠纪晚期至三叠纪早期海洋的营养循环和初级生产力的影响，并记录这些变化是否对动物的氮、磷和硅循环产生影响。我们将通过将地球化学代理重建与最先进的地球系统建模相结合来研究以下假设：（i）早期三叠纪生产力不受磷酸盐的限制，（ii）铵是主要形式。早三叠世海洋中的营养物-N，以及（iii）较高的海洋温度导致了早三叠世燧石间隙。虽然生成的代理记录将代表海洋特定部分的条件，但全球生物地球化学模型将提供有关营养物分布的全球视图。其他 Tersane 2.0 项目将使用代理记录和时空营养重建来测试营养水平的改变是否对生物体的灭绝风险、体型产生影响。特定生物体或导致 P-T 危机期间的纬度灭绝模式。