Deep-water renewal in a Scottish fjord: temperature, salinity and oxygen isotopes
Deep-water renewal in a Scottish fjord: temperature, salinity and oxygen isotopes
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苏格兰峡湾的深水更新：温度、盐度和氧同位素
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
M. Inall
中科院分区：
文献类型：
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作者：
W. Austin;M. Inall
苏格兰西北部的洛克斯海湾（峡湾）位于欧洲的一个地区，特别适合监测西风气流的变化。在这些气流中输送的湿气对区域降水、淡水径流以及反过来对海洋洛赫循环产生深远影响。区域盐度：δ 18 O混合线的坡度较缓，定义为0.18 ‰/盐度单位，表明在这些沿海沃茨中，温度：δ 18 O的关系很容易解决。在洛赫Etive的底层水域中，观测到的和经验模型预测的深水更新事件提供了评估温度、盐度和δ 18 O关系的机会。在深水更新事件期间，δ 18 Ocalcite的预测变化作为变化的盐度（ΔS）和变化的温度（ΔT）的函数，表明>80%超过分析检测限。在“古气候”记录中记录这种更新事件的理论可能性似乎是有希望的，但更新事件期间的温度和盐度变化可能有任何迹象。苏格兰峡湾，由于盐度对δ 18 O水的影响相对较小，可能为古气候研究提供有用的研究场所，特别是在古温度是主要记录的地方。
The sea lochs (fjords) of north-west Scotland are located in a region of Europe particularly well situated to monitor changes in westerly air streams. The moisture transported in these air streams has a profound effect on regional precipitation, freshwater run-off and, in turn, sea loch circulation. The gentle slope of the regional salinity:δ18O mixing-line, defined as 0.18 ‰ per salinity unit, suggests that the temperature: δ18O relationship may be readily resolved in these coastal waters. Deep-water renewal events, both observed and predicted from empirical models, in the bottom-waters of Loch Etive provide an opportunity to assess the temperature, salinity and δ18O relationship. Predicted changes in δ18Ocalcite as a function of changing salinity (ΔS) and changing temperature (ΔT) during deep-water renewal events suggest that >80% fall above analytical detection limits. The theoretical likelihood of recording such renewal events in the “palaeoclimate” record appears to be promising, but temperature and salinity change during renewal events may have either sign. Scottish fjords, because of the relatively small impact which salinity has on δ18Owater, may provide useful study sites in palaeoclimate research, particularly where palaeotemperature is the primary record of interest.