Late Cretaceous–early Tertiary palaeoclimates of northern high latitudes: a quantitative view
Late Cretaceous–early Tertiary palaeoclimates of northern high latitudes: a quantitative view
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北部高纬度地区晚白垩世-早第三纪古气候：定量观点
DOI：
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发表时间：
1990
影响因子：
2.7
通讯作者：
J. Parrish
中科院分区：
文献类型：
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作者：
R. Spicer;J. Parrish
对植物群落结构、植被和叶的外貌、树木的年轮和维管系统的分析提供了定性和定量的数据，这些数据可以结合起来，以比其他方法（主要是沉积学方法）更好的分辨率确定非海洋古气候参数。将这些技术应用于高古纬度（75°-85 ° N）的Cenomanian至古新世植物群表明，极光状况与现在相似。植物数据表明，森诺曼海平面年平均气温（MAT）为10 °C，科尼亚阶、马斯特里赫特阶和古新世的MAT分别为13 °C、5°C和6-7 °C。蒸发蒸腾应力在海平面低，降水量在大部分地区是均匀的整个生长季节在Cenomanian，可能发生的季节性干燥的马斯特里赫特。马斯特里赫特的冬季结冰是可能的，但在海平面上不存在冰缘条件。在塞诺马尼亚，永久冰可能在75°N的1700米以上，而在马斯特里赫特，永久冰可能在85°N的1000米以上。这些近极地的数据提供了关键的约束晚白垩世到早第三纪气候的全球模型。
Analyses of plant community structure, vegetational and leaf physiognomy, and growth rings and vascular systems in wood provide qualitative and quantitative data that can be combined to define non-marine palaeoclimatic parameters with better resolution than is available from other, principally sedimentological, methods. Application of these techniques to Cenomanian through Paleocene floras from high palaeolatitudes (75°-85°N) indicates a polar light regime similar to that of the present. Plant data suggests Cenomanian sea level mean annual air temperatures (MATs) of 10 °C, and MATs of 13 °C, 5°C and 6-7 °C in the Coniacian, Maastrichtian, and Paleocene respectively. Evapotranspirational stresses at sea level were low and precipitation was in most part uniform throughout the growing season in the Cenomanian, with possible seasonal drying occurring by the Maastrichtian. Maastrichtian winter freezing was likely, but periglacial conditions did not exist at sea level. Permanent ice was likely above 1700 m at 75°N in the Cenomanian, and above 1000 m at 85°N in the Maastrichtian. These near-polar data provide critical constraints on global models of Late Cretaceous to early Tertiary climates.