Greifensee CTD data 2011-2021 - complete photic profiles

Cleaned CTD profiles, where only profiles that were complete between 1 m and 8 m were used. Additional measurements after a full profile were deleted, as well as doubled measurements at the same depth. Measurement errors are not removed such as negative Chl-a/PAR values. The data still needs to be cleaned for that.

经初步清洗的CTD（Conductivity, Temperature, Depth）剖面数据：本次仅保留水深1米至8米区间内的完整剖面。同时删除了完整剖面后续的额外测量值，以及同一深度处的重复测量数据。但诸如叶绿素a（Chl-a）、光合有效辐射（PAR）负值这类测量误差尚未被剔除，针对该类误差的后续数据清洗工作仍有待完成。