Late Permian to Early Triassic palaeo-pCO2 and high latitude palaeotemperature

最近的研究表明，在二叠纪晚期，低纬度地区的气温上升了8摄氏度。早三叠纪气温持续上升，可能对低纬度地区的生命不利。大气中二氧化碳含量高，加上世界上大部分早三叠纪海洋的高温和缺氧条件，可能是二叠纪末大灭绝后物种恢复缓慢的原因。然而，到目前为止，无论是大气二氧化碳的演变还是高纬度地区的温度记录都无法进一步限制高大气二氧化碳水平、高温到极高温度、晚二叠纪大灭绝和早三叠纪缓慢恢复之间的因果关系。本研究重点重建了晚二叠世至中三叠世早期的大气pCO2水平和高纬度温度，以便更全面地了解这一关键时间区间的纬向温度演化。在碳酸盐古土壤上测量的碳同位素将用于估算古pco2，在牙形石磷灰石上测量的氧同位素将重建高纬度古温度。然后将温度和二氧化碳分压记录与低纬度和高纬度地区的古生物学模式进行比较，以评估动物对这致命三要素（温度、二氧化碳和缺氧）的两种反应的生态选择性。

Recent studies documented an 8° C temperature rise in low latitudes in the latest Permian. Temperatures continued to increase in the Early Triassic and potentially became inimical to life in low latitudes. High atmospheric CO2 levels in conjunction with high temperatures and anoxic conditions in large parts of the Worlds Early Triassic oceans may have been responsible for the protracted recovery in the aftermath of end-Permian mass extinction. However, to date, neither the atmospheric CO2 evolution nor temperature records from higher latitudes are available that could further constrain a causal link between high atmospheric CO2 levels, high to very high temperatures, the Late Permian mass extinction and the slow recovery in the Early Triassic. This study focuses on the reconstruction of atmospheric pCO2 levels and higher latitude temperatures for the latest Permian to early Middle Triassic in order to get a more comprehensive understanding of the latitudinal temperature evolution during this critical time interval. Carbon isotopes measured on carbonate palaeosols will be used to estimate palaeo-pCO2, higher latitude palaeotemperatures will be reconstructed from oxygen isotopes measured on conodont apatite. The temperature as well as pCO2 records will then be compared to palaeobiological patterns from lower and higher latitudes in order to assess the ecological selectivity of faunal responses to these two components of the deadly trio (temperature, CO2, and anoxia)