Soil and lake water temperatures of Iceland (2019-2021)

Temperature loggers (Thermochron DS1922L or DS1925L ibuttons, Maxim Integrated Products) were used to record soil and lake water temperatures at 1- to 6-hour intervals and 0.0625°C resolution. Soil temperature loggers were double wrapped in plastic bags (Whirlpak), placed inside plastic containers (PolyCon), sealed with electrical tape, and buried at 10 cm depth. Water temperature loggers were similarly double wrapped, placed inside 50 mL plastic containers (Nalgene or Falcon), sealed with electrical tape, and suspended at known depths in the lake.