Paleoenvironment of the Quilchena flora, British Columbia, during the Early Eocene Climatic Optimum
Paleoenvironment of the Quilchena flora, British Columbia, during the Early Eocene Climatic Optimum
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DOI：
10.1139/cjes-2015-0163
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发表时间：
2016-02
影响因子：
1.4
通讯作者：
R. Mathewes;D. Greenwood;S. B. Archibald
中科院分区：
文献类型：
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作者：
R. Mathewes;D. Greenwood;S. B. Archibald
Quilchena化石地点的年代为(51.5±0.4)Ma，为始新世早期气候最佳时期，该地点被重建为不列颠哥伦比亚省奥卡纳根高地和华盛顿州北部始新世早期最温暖和最潮湿的高地遗址。根据55个双子叶类型的叶缘分析，估算出年平均温度(MAT)为16.2±2.1°C/14.6±4.8°C。通过对45个近亲的生物气候分析，表明年平均温度(MAT)为12.7-16.6°C；冷月平均温度(CMMT)为3.5-7.9℃；年平均降水量(MAP)为103-157厘米/年。叶大小分析估计MAP为121±39厘米/年。气候叶分析多变量程序的估计证实了这些结果，尽管垫子略冷(13.3±2.1°C)。支持对温暖冬季极少或没有霜冻的解释的植物包括满江红、水杉、杉属、油杉、太子参、杜仲、水龙骨属、荷叶藤属、天南星属等。这些是..。
The Quilchena fossil locality is dated (51.5 ± 0.4 Ma) to the Early Eocene Climatic Optimum, and this locality is reconstructed as the warmest and wettest of the Early Eocene upland sites from the Okanagan Highlands of British Columbia and northern Washington State. Mean annual temperature (MAT) is estimated from leaf margin analysis, using 55 dicot morphotypes, as 16.2 ± 2.1 °C/14.6 ± 4.8 °C. Using bioclimatic analysis of 45 nearest living relatives, a moist mesothermal climate is indicated (MAT 12.7–16.6 °C; cold month mean temperature (CMMT) 3.5–7.9 °C; mean annual precipitation (MAP) 103–157 cm/year. Leaf size analysis estimates MAP at 121 ± 39 cm/year. Estimates from the climate leaf analysis multivariate program corroborate these results, although with a slightly cooler MAT (13.3 ± 2.1 °C). Plants that support an interpretation of warm winters with minimal or no frost include Azolla, Glyptostrobus, Taxodium, Keteleeria, Pseudolarix, Eucommia, Dipteronia, Hovenia, Ternstroemia, and others. These ther...