Mg/Ca-Temperature Calibration of Polar Benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf

Mg/Ca-Temperature Calibration of Polar Benthic foraminifera species for reconstruction of bottom water temperatures on the Antarctic shelf
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极地底栖有孔虫物种的镁/钙温度校准,用于重建南极大陆架底部水温

DOI:
10.1016/j.gca.2020.05.027
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发表时间:
2020
影响因子:
5
通讯作者:
Mawbey E
Mawbey E
中科院分区:
地球科学1区
文献类型:
--
作者:
Mawbey E

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底栖有孔虫Mg/Ca是古气候研究中常用的底水温指标。Mg/Ca和BWT之间的关系,许多物种已被确定使用核心顶部和培养研究。然而,南极大陆架沉积物中钙质微体化石的稀缺性和在低温下定义不清的校准限制了有孔虫Mg/Ca古温度计在南极冰近端沉积物中的使用。在这里,我们提供了成对的海洋温度和现代底栖有孔虫Mg/Ca数据的三个物种,Trifarina angulosa,Bulimina aculeata,和Globopulina dulina subglobosa,但特别关注Trifarina angulosa。来自南极几个部门的核心顶部数据跨越-1.7到+1.2 °C的BWT范围,并限制了Mg/Ca和寒冷温度之间的关系。我们比较我们的研究结果发表的低纬度核心顶部数据的物种在相同或相关的属,并在的情况下Trifarina angulosa,产生区域校准。由此得到的区域方程为Trifarina angulosais温度(°C)=(Mg/Ca −1.14 ± 0.035)/0.069 ± 0.033)。将我们的Trifarina angulos添加到先前已分离的Uvigerina spp.数据集提供了一种替代的全局校准,尽管一些数据点似乎偏离了这种关系,并进行了讨论。本文还结合前人的实验数据,建立了棘球布螺和球扁螺的Mg-温度关系式:温度(°C)=(Mg/Ca-1.04 ± 0.07)/0.099 ± 0.01,温度(°C)=(Mg/Ca-0.99 ± 0.03)/0.087 ± 0.01。这些改进的校准突出了潜在的效用,底栖有孔虫镁/钙古测温重建过去的BWT在南极边缘设置。
Benthic foraminifera Mg/Ca is a well-established bottom water temperature (BWT) proxy used in paleoclimate studies. The relationship between Mg/Ca and BWT for numerous species has been determined using core-top and culturing studies. However, the scarcity of calcareous microfossils in Antarctic shelf sediments and poorly defined calibrations at low temperatures has limited the use of the foraminiferal Mg/Ca paleothermometer in ice proximal Antarctic sediments. Here we present paired ocean temperature and modern benthic foraminifera Mg/Ca data for three species,Trifarina angulosa,Bulimina aculeata, andGlobocassidulina subglobosa,but with a particular focus onTrifarina angulosa.The core-top data from several Antarctic sectors span a BWT range of −1.7 to +1.2 °C and constrain the relationship between Mg/Ca and cold temperatures. We compare our results to published lower-latitude core-top data for species in the same or related genera, and in the case ofTrifarina angulosa,produce a regional calibration. The resulting regional equation forTrifarina angulosais Temperature (°C) = (Mg/Ca −1.14 ± 0.035)/0.069 ± 0.033). Addition of ourTrifarina angulosadata to the previously publishedUvigerina spp. dataset provides an alternative global calibration, although some data points appear to be offset from this relationship and are discussed. Mg-temperature relationships forBulimina aculeataandGlobocassidulina subglobosaare also combined with previously published data to produce calibration equations of Temperature (°C) = (Mg/Ca-1.04 ± 0.07)/0.099 ± 0.01 and Temperature (°C) = (Mg/Ca-0.99 ± 0.03)/0.087 ± 0.01, respectively. These refined calibrations highlight the potential utility of benthic foraminifera Mg/Ca-paleothermometry for reconstructing past BWT in Antarctic margin settings.
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