Sea water temperature and light intensity at hard-bottom high-Arctic shallow subtidal fjord locations

As part of an ecological monitoring initiative, the Institute of Oceanology Polish Academy of Sciences (IO PAN, Marine Ecology Department) deployed a series of bespoke metal constructions to conduct a long-term multipurpose experiment assessing the ecology of hard-bottom assemblages in the shallow subtidal of southern Isfjorden proper between 2006 and 2022 (16yr). Attached to these submerged constructions were data-loggers of temperature and light intensity. These datasets contain the sea water temperature (degC) and light intensity (lux) at sea floor data of the loggers installed at two depth strata (7 and 8m infralittoral, and 14±1m circalittoral) of two arctic hard-bottom sites in Isfjorden (Spitsbergen, 78°N). Datasets are provided in .nc format (CF-NetCDF) which include metadata, and .csv files for those who prefer a different format. However, we strongly suggest using the .nc files (link to helpful documentation in GitHub repository can be found in related materials below). We also provide processed monthly and annual means, maxima, and minima for further in-depth analysis. The high temporal resolution dataset (every 30 min, between 2006–2022) serves as baseline for long-term investigations at the shallows of a high-Arctic fjord undergoing severe environmental changes.