Towards calibration of the TEX86 palaeothermometer for tropical sea surface temperatures in ancient greenhouse worlds
Towards calibration of the TEX86 palaeothermometer for tropical sea surface temperatures in ancient greenhouse worlds
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DOI：
10.1016/j.orggeochem.2007.05.014
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发表时间：
2007-01-01
影响因子：
3
通讯作者：
Damste, Jaap S. Sinninghe
中科院分区：
文献类型：
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作者：
Schouten, Stefan;Forster, Astrid;Damste, Jaap S. Sinninghe
在25 ~ 40℃的温度下对热带印度洋海域的海洋绿原藻进行培养，研究GDGT膜脂组成的变化。结果表明，古细菌16S核糖体DNA分析显示，不同物种在中等（25℃）和较高（36℃）的最佳生长温度下繁殖。对GDGT分布的分析表明，TEX86与孵育温度的线性相关性与先前在较低温度下的孵育实验相似[Wuchter， C, Schouten， S., Coolen， M.J.L, Sinninghe Damste， J.S, 2004]。古海洋学19，PA4028, doi:10.1029/2004PA001041]。我们的研究结果表明，绿古藻可以在比现在热带海洋表面温度更高的温度下茁壮成长，比如古代温室世界中热带海洋的高温（高达40摄氏度）。我们的结果还表明，TEX86仍然适用于这种制度。然而，从培养实验中获得的GDGT分布中的绿古酚区域异构体远远少于地质过去异常温暖的海洋沉积的沉积物，因此我们的实验室结果不能直接用于将这些沉积物的TEX86值转换为温度。(C) 2007 Elsevier Ltd.版权所有。
Marine Crenarchaeota from tropical Indian Ocean water were incubated at temperatures ranging from 25 to 40 degrees C to study the changes in glycerol dibiphytanyl glycerol tetraether (GDGT) membrane lipid composition. The results show that Crenarchaeota were able to thrive at temperatures up to 40 degrees C. Archaeal 16S ribosomal DNA analysis revealed that different species proliferated with moderate (25 degrees C) and high (36 degrees C) optimum growth temperatures. Analysis of the GDGT distribution shows a similar linear correlation of TEX86 with incubation temperature as demonstrated previously for incubation experiments at lower temperatures [Wuchter, C., Schouten, S., Coolen, M.J.L., Sinninghe Damste, J.S., 2004. Paleoceanography 19, PA4028, doi:10.1029/2004PA001041]. Our results show that Crenarchaeota can thrive at temperatures warmer than present day tropical sea surface temperatures, such as the high temperature (up to 40 degrees C) inferred for tropical oceans in ancient greenhouse worlds. Our results also imply that the TEX86 is still applicable in this regime. However, the crenarchaeol regioisomer in the GDGT distribution obtained from the incubation experiments is substantially less than in sediments deposited in exceptionally warm oceans of the geological past, so our laboratory results cannot be directly used to convert TEX86 values from these sediments into temperature. (C) 2007 Elsevier Ltd. All rights reserved.