New indices and calibrations derived from the distribution of crenarchaeal isoprenoid tetraether lipids: Implications for past sea surface temperature reconstructions
New indices and calibrations derived from the distribution of crenarchaeal isoprenoid tetraether lipids: Implications for past sea surface temperature reconstructions
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DOI：
10.1016/j.gca.2010.05.027
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发表时间：
2010-08-15
影响因子：
5
通讯作者：
Damste, Jaap S. Sinninghe
中科院分区：
文献类型：
--
作者：
Kim, Jung-Hyun;van der Meer, Jaap;Damste, Jaap S. Sinninghe
一些研究表明，古类异戊二烯甘油二联植酸甘油四醚(GDGTS)的分布与海表面温度(SST)有很强的关系。在此基础上，开发了一种称为TEX86(由86个碳原子组成的四醚指数)的GDGT比率作为SST的替代。在这项研究中，我们确定了116个主要来自(亚)极地海洋的岩心-顶部沉积物中类寒武纪类异戊二烯GDGT的分布，并将这些数据与以前发表的岩心-顶层数据相结合：使用这个扩展的全球岩心-顶层数据集(n=426)，我们重新评估了古类异戊二烯GDGT与SST的关系。我们从全球岩心顶部数据集中排除了红海的数据，以定义新的指数和校准模型，因为与海洋其他部分相比，盐度升高的红海似乎表现不同。我们在三个不同的古数据集上测试了我们的新指数和校准模型，代表了不同的温度范围。我们的结果表明，在(亚)热带海洋中，考古醇区域异构体在温度适应中的作用比在(亚极地)海洋中更重要，这表明不同温度下栖息的考古醇群落的膜适应可能存在差异。因此，我们建议应用两种不同的校准模型。对于整个校准温度范围(-3到30℃)，具有对数函数的TEX86的修改版本被称为TEX86L，其与SST的相关性最好：SST=67.5xTEX86L+46.9(r(2)=0.86，n=396，p
Several studies have shown that there is a strong relationship between the distribution of crenarchaeotal isoprenoid glycerol dibiphytanyl glycerol tetraethers (GDGTs) and sea surface temperature (SST). Based on this, a ratio of certain GDGTs, called TEX86 (Tetra Ether indeX of tetraethers consisting of 86 carbon atoms), was developed as a SST proxy. In this study, we determined the distribution of crenarchaeotal isoprenoid GDGTs in 116 core-top sediments mostly from (sub)polar oceans and combined these data with previously published core-top data:Using this extended global core-top dataset (n = 426), we re-assessed the relationship of crenarchaeal isoprenoid GDGTs with SST. We excluded data from the Red Sea from the global core-top dataset to define new indices and calibration models, as the Red Sea with its elevated salinity appeared to behave differently compared to other parts of the oceans. We tested our new indices and calibration models on three different paleo datasets, representing different temperature ranges. Our results indicate that the crenarchaeol regio-isomer plays a more important role for temperature adaptation in (sub)tropical oceans than in (sub)polar oceans, suggesting that there may be differences in membrane adaptation of the resident crenarchaeotal communities at different temperatures. We, therefore, suggest to apply two different calibration models. For the whole calibration temperature range (-3 to 30 degrees C), a modified version of TEX86 with a logarithmic function which does not include the crenarchaeol regio-isomer, called TEX86L, is shown to correlate best with SST: SST = 67.5 x TEX86L + 46.9 (r(2) = 0.86, n=396, p