Baltic Sea Ice Climate Workshop 2005 
30 
Fast ice site 2004-2005 
Umeâ Marine Research Station is located on the shore of the Northern Quark in the village of 
Norrbyn, 40 km south of Umeâ. A float was deployed at the station, about 0.5 km from the 
shore, on November 18, 2004 (Fig. 1). The sea was still open, surface temperature about 3°C. 
Fig. 1. Umeâ float, deployed in November 18, 2004. The mast has meteorological instruments 
in two levels, and solar radiation sensors are in the arm. 
The instrumentation of the float included the following quantities: 
(i) Surface layer meteorology: wind speed and air temperature at two levels (1 m and 2 m), 
humidity and wind direction at 2 m level, and incoming and outgoing solar radiation at 1 
m level. 
(ii) Ice: thermistor chain and a line of PAR (Photosynthetically Active Radiation) sensors 
were lowered into the water for recording in the water first and later in the ice as the 
sensors were to be trapped by the ice. 
(iii) Temperature, salinity and currents in water: A 3-dimensional sonic current meter was 
deployed at 5-m depth, anchored to the bottom. The instrument also recorded the 
temperature and salinity of the water.