DOI: 10.5281/zenodo.14823402
title: The micrometeorological (eddy-covariance) and hydrological measurements collected on two glacial lakes in the Schirmacher oasis, East Antarctica.

description: The data set includes the micrometeorological (eddy-covariance) and hydrological  measurements collected during two austral summers (December – January) in 2017–2018 and 2019–2020 on two lakes located in the Schirmacher oasis (70° 45′ S, 11° 44′ E), Dronning Maud Land, East Antarctica. The eddy-covariance (EC) measurements were done with integrated CO2 and H2O open-path gas analyzer and 3-D sonic anemometer IRGASON by Campbell Scientific (the serial number 1243) installed on the shore of two glacial lakes. Figure shows the location of the micrometeorological (yellow dots) and hydrological (red dots) instrumentations installed on the lakes in the Schirmacher oasis (top) and the IRGASON deployed on the shore of Lake Zub/Priyadarshini (left, bottom) and Lake Glubokoe (right, bottom). The lake surface water temperature (LSWT) was measured by the HOBO instrumentation (red dots in Figure, top) which logged the temperature every 30 minutes with the accuracy ±0.44 degree. The HOBO logger was installed at a depth of 0.02 m. 

In the first experiment, the eddy covariance (EC) measurements were done in 38 days (1, January, 2018 – 8, February, 2018) covering the lake ice free period on Lake Zub/Priyadarshini. The IRGASON was deployed to the north-west at a distance of 10 m from the shoreline. The instrument was placed on the aluminium tripod on the height of 2 m, and directed toward 137° south-eastwards (SE). The second experiment lasted from 7 December 2019 to 8 January 2020, and the observational period covered 33 days. The IRGASON was deployed on a mast installed at a distance of 10 m from the shore of Lake Glubokoe. It was placed at a height of 1.8 m and its water vapour sensor was directed toward 144° south-eastwards. On Lake Glubokoe, the experiment covers the ice break-up on the lake. In Lake Glubokoe, the measurements of the LSWT cover the period from 8 December 2019 to 12 February 2020.

The micrometeorological measurements are stored in the files named as 20171230_20180208_EC_FLUX.txt (Lake Zub/Priyadarshini) and 20191207_20200108_EC_FLUX.txt (Lake Glubokoe). The files are in the following format: Date Time, is the time stamp (TS) with the format “yy/mm/dd HH:MM:SS”; npoints, is number of measurements [2]; u_starr (m/s), taur Kg(m s^2) are u_star and momentum flux [3], [4];Hcr (W/m^2) is a sensible heat flux humidity; LE_wplr (W/m^2), is a latent heat flux //  J m-2 s-1; Evap (L/m^2) is calculated by Potes et al (2017), mm 30min-1; Fc_wplr (mg/(m^2 s)), Fc_wpl_umol (umol/(m^2 s)), is carbon flux with WPL correction, mg/(m^2 s) and umol/(m^2 s); CO2_conc (mg/m^3), CO2_PPM (PPM), CO2_sig_str (arb), are CO2 concentration (two unit) and the Irgason’s signal strength; H2O_conc (g/m^3), H2O_sig_str (arb), are H2O concentration and the Irgason’s signal strength; Temp_amb (C), Amb_Press (kPa), are ambient air temperature and atmospheric pressure;  wind_speed (ms-1), wind dir_sonic (degree), are wind speed and direction; obukhov (m), zeta (arb), rou (m), sigmaw_ustar (arb), are Obukhov length, stability parameter, roughness; Xmax (m), XR90 (m), are 90% of footprint (m) and maximum of footprint (m). 

The  hydrological measurements are stored in the files named as HOBO20172018.csv (Lake Zub/Priyadarshini) and HOBO20192020.csv (Lake Glubokoe). These files have the following format: Date Time, GMT+02:00; Abs Pres, kPa; Temp, °C ; Water Level, meters.

The dataset has been collected under the project “Antarctic meteorology and snow research from process understanding to improved predictions” funded by the Academy of Finland (contract number 304345). We thank Pankaj Ramji Dhote, Dmitrii Emelyanov and Ivan Kolesnikov who were involved in the maintenance of the instrumentation during the field campaigns.