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

最近的研究证明，在最近的二叠纪，低纬度地区的温度上升了8℃。在早三叠世，气温继续上升，并可能对低纬度地区的生命构成威胁。大气中二氧化碳的高水平，加上世界大部分地区的高温和缺氧条件，可能是二叠纪末期大规模灭绝后的长期复苏的原因。然而，到目前为止，无论是大气二氧化碳的演变还是来自更高纬度的温度记录，都无法进一步限制高大气二氧化碳水平、高到极高的温度、晚二叠世大灭绝和早三叠世缓慢恢复之间的因果联系。为了更全面地了解这一关键时期的纬向温度演化，本文重点研究了晚二叠世至中三叠世早期大气PCO_2水平和高纬度温度的重建。碳酸盐古土壤上测得的碳同位素将被用来估算古二氧化碳，较高纬度的古温度将由牙形石磷灰石上测得的氧同位素恢复。然后将温度和二氧化碳记录与低纬度和高纬度地区的古生物模式进行比较，以评估动物对这三个致命因素(温度、二氧化碳和缺氧)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)