Sensible & latent heat fluxes, momentum flux, roughness length, boundary layer height, and CO2 flux from intermittent deployments of eddy-covariance system by KOPRI scientists.

Processed, quality-controlled data from the 300 kHz RDI ADCP (SN 20687) deployed from the ice floe 22 January - 21 February, 2015.

Nortek Signature 1000 ADCP measured ocean currents

Cloud mask, base height, top-height, phase, and boundary layer height

RDI Long Ranger 75 kHz ADCP measured ocean currents

On the four N-ICE2015 floes we installed in total seven hot-wire fields and seven snow-stake fields following the routine outlined in Perovich [2003]. A rectangular hot-wire field with a side length of approximately 10 m was designed in a way that in each corner a wire was installed close to an ablation stake, and in the middle of the hot-wire field nine snow-stakes with even spacing were set up. Snow depth and ice thickness changes were recorded on a regular basis, and the readings were averaged in space to cover small scale spatial variability. For the snow stake readings see https://data.npolar.no/dataset/3099ea95-c3cd-4a8b-af5d-73750e46d791.

The EMbird was flown from RV Lance on legs 3 & 4 of the NICE expedition; that is in transit to, and on station at, Floe 3. We would like to thank the crews of Airlift helicopter and RV Lance for their assistance with the collection of this dataset. # Basic flight information |Flight|Date|Start Time(UTC)|Purpose/ notes| |---|---|---|---| |F1|15-04-15|18:09|-| |F2|18-04-15|16:42|NO DATA! Aborted 5 mins in due weather conditions.| |F3|19-04-15|09:05|Survey line also flown by BAS twin Otter / Partly coincident with ALOS image. NB GPS drops| |F4|24-04-15|08:52|Local area survey. Later same line was flown by BAS twin Otter.| |F5|24-04-15|14:29|Cryosat-2 underflight. Partly coincident with previous evenings ALOS image. NB GPS drops| |F6|28-04-15|07:34|- NB GPS drops| |F7|29-04-15|09:07|Partly coincident with ALOS image (long track north east).| |F8|30-04-15|09:17|-| |F9|03-05-15|11:40|NO DATA! Aborted 10 mins in due weather conditions.| |F10|05-05-15|11:14|-| |F11|05-05-15|12:54|Cryosat-2 underflight. NB GPS drops| |F12|05-05-15|16:49|-| |F13|06-05-15|09:07|-| |F14|06-05-15|14:36|Overflew line of long walk with EM31 and magnaprobe (ice and snow thickness data).| |F15|08-05-15|08:00|Partly coincident with TSX image.| |F16|11-05-15|14:45|Short flight -visibility poor. Attempted to overfly inner buoy ring.| |F17|12-05-15|11:27|-| |F18|18-05-15|11:42|-| # Data format Filenames: Each file name follows the convention: date flight number V2 Data is presented as tab delimited text with the following columns: Date, Latitude, Longitude, Sea Ice Thickness (m) # Production Method Flight data was processed in IGOR using routines originally developed at AWI (Alfred Wegener Institute for Polar and Marine Research). The processing has two stages, first detrending the data to correct for instrument drift, and then recalibrating the sea ice thickness based on flight notes and Go-Pro pictures showing ice conditions. The routine used to generate sea ice thickness from the detrended raw data relies on a model file which varies depending on sea water conductivity. Based on information from Amelie Meyer about the conductivity measured from the ship CTD, 2700ms was chosen for all flights. The thickness produced by these routines is ‘total thickness’ that is ice + snow, but is normally referred to as ‘sea-ice thickness’. Following processing with the IGOR routines bad data (NaN and negative values) has been removed. **IMPORTANT LIMITATIONS RE GPS DROPS** Flights 3,5,6 & 11 suffered with the GPS on the bird dropping out for long sections. When this happens the logger still logs GPS TIME but the POSITION is missing. I have fixed these sections by matching GPS track from a GPS carried in the helicopter to the thickness measurements using GPS time (interpolating thickness onto the GPS track). This was done 'by hand' in Matlab AFTER processing the thickness data with the IGOR routines. Please contact me (Jennifer King) if you find something in the data from these flights that does not make sense.

Profiles of total absorption coefficient of sea water at 440 nm with Hobilabs a-Sphere integrating sphere instrument (excluding pure water absorption). Taken coincident with SBE19+ and ISUS (nitrate sensor) profiles. AC-9 profiles were taken right after a-Sphere profiles were completed. In situ profiles of optical properties were made from a heated tent at the ice camp several hundred meters away from the ship.

Seawater, sea ice and snow samples salinity measured oboard the Lance by Autosal Portasal 8400 salinometer.

Sensible & latent heat fluxes, momentum flux, roughness length and boundary layer height from eddy-covariance system deployed on the ice floe, nearby surface meteorology and radiation observations.