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

最近的研究表明，在二叠纪末，低纬度地区的气温上升了8° C。早三叠世的温度持续上升，对低纬度地区的生命产生了潜在的危害。大气中的高二氧化碳水平，加上世界上早三叠世海洋大部分地区的高温和缺氧条件，可能是二叠纪末大规模灭绝后长期恢复的原因。然而，到目前为止，无论是大气中的二氧化碳演变，也没有温度记录从高纬度地区，可以进一步限制高大气中的二氧化碳水平，高到非常高的温度，晚二叠世大规模灭绝和恢复缓慢的早三叠世之间的因果关系。本研究重点重建了二叠纪末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段的纬向温度演化。碳酸盐古土壤碳同位素可用于估算古CO2，牙形石磷灰石氧同位素可用于高纬度古温度的重建。然后将温度和pCO2记录与来自低纬度和高纬度的古生物学模式进行比较，以评估动物对致命三要素（温度、CO2和缺氧）的反应的生态选择性。

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)