Monthly sea temperature in 50 m water depth derived from in situ observations offshore L'Estartit (NW Mediterranean) since 1974

In-situ sea temperatures have been obtained using two Richter and Wiese protected reversing thermometers mounted on a Nansen bottle. Temperature readings, after correction according to the thermometer's calibration certificates are averaged if the temperature difference among thermometers is lower than 0.2°C and repeated otherwise, so that the accuracy can be set to be lower than 0.2°C. Thermometers are periodically controlled at facilities of the Marine Research Institute (ICM) in Barcelona against a high precision Pt100. which, in turn is annually controlled using Ga and pure H2O melting points.

本数据集的原位海水温度采用两台安装于尼斯金采水器（Nansen bottle）上的里希特-威泽型防倒转温度计（Richter and Wiese protected reversing thermometers）测得。若两台温度计间的温度差值低于0.2℃，则依据各温度计的校准证书完成读数修正后取平均值；若差值超出该阈值，则需重复测量，以此将测量精度控制在0.2℃以内。上述温度计定期于巴塞罗那海洋研究所（ICM）的校准设施内，以高精度铂电阻温度传感器Pt100（Pt100）为基准进行校准；该Pt100传感器每年则借助镓（Ga）与纯水（H₂O）的熔点完成溯源校准。