Surface temperature, surface oxygen, water clarity, water chemistry and phytoplankton chlorophyll a data from Derwent Water, 1990 to 2013

This is a long-term monitoring dataset of surface temperature, surface oxygen, water clarity, water chemistry and phytoplankton chlorophyll a from fortnightly sampling by the Centre for Ecology & Hydrology (and previously the Institute of Freshwater Ecology) at Derwent Water in Cumbria, England. The data available to download comprise surface temperature (TEMP) in degree Celsius, surface oxygen saturation (OXYG) in % air-saturation, Secchi depth (SECC) in metres, alkalinity (ALKA) in µg per litre as CaCO3 and pH. Ammonium (NH4N), nitrate (NO3N), soluble reactive phosphate (PO4P), total phosphorus (TOTP), dissolved reactive silicon expressed as SiO2 (SIO2) and phytoplankton chlorophyll a (TOCA) are all given in µg per litre. Measurements are made from a boat at a marked location (buoy) at the deepest part of the lake. When it was not possible to visit the buoy, samples were taken from the shore, thus water samples were not integrated on these occasions, marked as Flag 2. All data are from August 1990 until the end of 2013.

本数据集为英国生态与水文中心（Centre for Ecology & Hydrology，前身为淡水生态研究所）于英格兰坎布里亚郡德文特湖开展的每两周一次采样的长期监测数据集，监测指标涵盖表层水温、表层溶解氧、水体透明度、水化学参数及浮游植物叶绿素a。可下载的数据包含：以摄氏度为单位的表层水温（TEMP）、以空气饱和百分比为单位的表层氧饱和度（OXYG）、以米为单位的塞氏深度（SECC）、以碳酸钙（CaCO3）计的微克每升级碱度（ALKA）以及pH值；铵态氮（NH4N）、硝态氮（NO3N）、可溶性活性磷（PO4P）、总磷（TOTP）、以二氧化硅（SiO2）计的溶解性活性硅（SIO2）与浮游植物叶绿素a（TOCA）的单位均为微克每升。所有测量工作均在湖区最深区域的标记浮标位置乘船开展；若无法抵达浮标位置，则从岸边采集水样，此类场景下未对水样进行均质混合，样本标记为Flag 2。所有数据的时间跨度为1990年8月至2013年年末。