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首页> 外文期刊>Earth and Planetary Science Letters: A Letter Journal Devoted to the Development in Time of the Earth and Planetary System >Core-top calibration of the lipid-based U_(37)~K′ and TEX_(86) temperature proxies on the southern Italian shelf (SW Adriatic Sea, Gulf of Taranto)
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Core-top calibration of the lipid-based U_(37)~K′ and TEX_(86) temperature proxies on the southern Italian shelf (SW Adriatic Sea, Gulf of Taranto)

机译：在意大利南部大陆架（西南亚得里亚海，塔兰托湾）上基于脂质的U_（37）〜K'和TEX_（86）温度代理进行核心顶部校准

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摘要

The Mediterranean Sea is at the transition between temperate and tropical air masses and as such of importance for studying climate change. The Gulf of Taranto and adjacent SW Adriatic Sea are at the heart of this region. Their sediments are excellently suited for generating high quality environmental records for the last millennia with a sub-decadal resolution. The quality of these records is dependent on a careful calibration of the transfer functions used to translate the sedimentary lipid signals to the local environment. Here, we examine and calibrate the U_(37)~K′ and TEX_(86) lipid-based temperature proxies in 48 surface sediments and relate these to ambient sea surface temperatures and other environmental data. The U_(37)~K′ -based temperatures in surface sediments reflect winter/spring sea surface temperatures in agreement with other studies demonstrating maximum haptophyte production during the colder season. The TEX_(86)-based temperatures for the nearshore sites also reflect winter sea surface temperatures. However, at the most offshore sites, they correspond to summer sea surface temperatures. Additional lipid and environmental data including the distribution of the BIT index and remote-sensed chlorophyll-a suggest a shoreward increase of the impact of seasonal and spatial variability in nutrients and control of planktonic archaeal abundance by primary productivity, particle loading in surface waters and/or overprint by a cold-biased terrestrial TEX_(86) signal. As such the offshore TEX_(86) values seem to reflect a true summer signal to the effect that offshore U_(37)~K′ and TEX_(86) reconstruct winter and summer temperature, respectively, and hence provide information on the annual temperature amplitude.
机译：地中海正处于温带和热带气团之间的过渡时期，因此对于研究气候变化具有重要意义。塔兰托湾和邻近的西南亚得里亚海位于该地区的中心。它们的沉积物非常适合生成近千年的高质量环境记录，分辨率不到十年。这些记录的质量取决于对用于将沉积脂质信号转化为当地环境的传递函数的仔细校准。在这里，我们检查并校准了48种表面沉积物中基于U_（37）〜K'和TEX_（86）脂质的温度代理，并将它们与周围海表温度和其他环境数据相关联。表层沉积物中基于U_（37）〜K'的温度反映了冬季/春季的海表温度，这与其他研究表明在较冷季节最大的触藻植物产量相关。近岸站点基于TEX_（86）的温度也反映了冬季海表温度。但是，在大多数近海站点，它们对应于夏季海表温度。其他脂质和环境数据（包括BIT指数的分布和遥感叶绿素-a）表明，季节性生产力和空间变异对养分的影响以及初级生产力，地表水中颗粒物的含量和/或对浮游古细菌丰度的控制呈上升趋势。或通过冷偏置的地面TEX_（86）信号叠印。因此，离岸TEX_（86）值似乎反映了一个真正的夏季信号，表明离岸U_（37）〜K'和TEX_（86）分别重构了冬季和夏季温度，因此提供了有关年温度幅度的信息。

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