High-frequency winter water temperature and dissolved oxygen at Lake Sunapee, New Hampshire, USA, 2014-2023

The Lake Sunapee Protective Association (LSPA) has been
monitoring water quality in Lake Sunapee, New Hampshire, USA, since the
1980s. Beginning in the winter of 2014-2015, the LSPA deployed a string
of HOBO temperature sensors at a location near Loon Island (43.391N,
72.058W, where their instrumented buoy is located during the summer
months) for under-ice water temperature profile monitoring. A HOBO U26
dissolved oxygen sensor was added to this monitoring string during the
winter of 2017-2018 through the winter of 2019-2020. All sensors record
data in 15-minute intervals over the winter and are downloaded after
ice-off. All data have been QAQC'd to remove obviously errant readings and
artifacts of maintenance and flag highly suspicious readings.