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.

预计人为海洋变暖将导致海洋分层增加，海洋内部溶解的O2减少，对营养循环、初级生产力、碳循环和海洋生境产生影响。二叠纪-三叠纪（P-T）时间间隔可以看作是现代气候变化的极端情况模拟。它不仅见证了中生代最灾难性的大规模灭绝，而且伴随着8至10° C的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二叠纪末至三叠纪初海洋营养循环和初级生产力的影响，并记录这些变化是否可能对动物群的灭绝/恢复产生影响。氮，磷和硅循环将通过地球化学代用重建与最先进的地球系统建模相结合进行研究。我们将测试的假设，（一）早三叠世的生产力不受磷酸盐，（二）铵是一种主要形式的营养氮在早三叠世的海洋，和（iii）较高的海洋温度造成的早三叠世硅质岩间隙。虽然生成的代用记录将代表海洋特定部分的状况，但全球生物地球化学建模将以相对较高的空间分辨率提供关于营养物分布和可用性的全球视图。其他Tersane 2.0项目将使用代理记录以及时空营养重建来测试营养水平的改变是否会影响生物的灭绝风险，特定生物的体型或导致P-T危机期间的纬度灭绝模式。