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.

预计人为海洋变暖会导致海洋分层增加和海洋内部溶解的O2下降，对营养循环，一级生产力，碳循环和海洋栖息地的影响。二叠纪 - 三叠纪（P-T）时间间隔可以看作是与现代气候变化的极端情况。它不仅见证了phanerozoic的最灾难性质量扩展，而且在8至10°C下完成了低纬度变暖和广泛的全球海洋缺氧。该项目旨在重建全球变暖对最新二叠纪至早期三叠纪海洋中营养周期和初级生产力的影响，并记录这些变化是否可能对动植物的扩展/恢复产生影响。氮，磷和硅周期将通过将地球化学代理重建与最新的地球系统建模相结合，进行研究。我们将测试（i）早期三叠纪生产率不受磷酸盐的限制，（ii）铵是早期三叠纪海洋中营养-N的一种主要形式，并且（iii）较高的海洋温度引起了早期三叠纪的chert裂口。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建模将以相对较高的空间分辨率为养分分布和可用性提供全球视图。其他Tersane 2.0项目将使用代理记录以及空间暂时的营养重建，以测试是否改变了对生物体扩展风险的营养水平，特定生物体的体型或导致P-T危机期间的纬度延伸模式。