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首页> 外文期刊>Paleoceanography >Improving past sea surface temperature reconstructions from the Southern Hemisphere oceans using planktonic foraminiferal census data
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Improving past sea surface temperature reconstructions from the Southern Hemisphere oceans using planktonic foraminiferal census data

机译：利用浮游有孔虫人口普查数据改善南半球海洋过去的海表温度重建

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摘要

We present an improved database of planktonic foraminiferal census counts from the Southern Hemisphere oceans (SHO) from 15 degrees S to 64 degrees S. The SHO database combines three existing databases. Using this SHO database, we investigated dissolution biases that might affect faunal census counts. We suggest a depth/ CO32- threshold of similar to 3800m/ CO32-=similar to-10 to -5 mu mol/kg for the Pacific and Indian Oceans and similar to 4000m/ CO32-=similar to 0 to 10 mu mol/kg for the Atlantic Ocean, under which core-top assemblages can be affected by dissolution and are less reliable for paleo-sea surface temperature (SST) reconstructions. We removed all core tops beyond these thresholds from the SHO database. This database has 598 core tops and is able to reconstruct past SST variations from 2 degrees to 25.5 degrees C, with a root mean square error of 1.00 degrees C, for annual temperatures. To inspect how dissolution affects SST reconstruction quality, we tested the data base with two leave-one-out tests, with and without the deep core tops. We used this database to reconstruct summer SST (SSST) over the last 20ka, using the Modern Analog Technique method, on the Southeast Pacific core MD07-3100. This was compared to the SSST reconstructed using the three databases used to compile the SHO database, thus showing that the reconstruction using the SHO database is more reliable, as its dissimilarity values are the lowest. The most important aspect here is the importance of a bias-free, geographic-rich database. We leave this data set open-ended to future additions; the new core tops must be carefully selected, with their chronological frameworks, and evidence of dissolution assessed.
机译：我们提供了南半球海洋（SHO）从15度到64度的浮游有孔虫普查计数的改进数据库。SHO数据库结合了三个现有数据库。使用这个SHO数据库，我们调查了可能影响动物普查计数的溶解偏倚。对于太平洋和印度洋，我们建议深度/ CO32-阈值近似于3800m / CO32- =近似于10至-5μmol/ kg，类似于4000m / CO32- =近似于0至10μmol/ kg对于大西洋而言，其芯顶组合可能受溶解作用影响，而对古海表面温度（SST）重建而言则不那么可靠。我们从SHO数据库中删除了超出这些阈值的所有核心顶部。该数据库具有598个核心顶部，并且能够重建从2度到25.5摄氏度的过去SST变化，对于年温度而言，均方根误差为1.00摄氏度。为了检查溶出度如何影响SST重建质量，我们使用两个留一法测试（有无深核顶部）对数据库进行了测试。我们使用此数据库通过“现代模拟技术”方法在东南太平洋核心MD07-3100上重建了过去20ka的夏季SST（SSST）。将其与使用用于编译SHO数据库的三个数据库重建的SSST进行了比较，从而表明使用SHO数据库的重建更可靠，因为其相异值最低。这里最重要的方面是无偏差，地理分布丰富的数据库的重要性。我们保留此数据集的开放性，以备将来添加;必须仔细选择新的核心上衣，并按时间顺序排列，并评估溶解的证据。

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