Baltic  Sea  Ice  Climate  Workshop  2005

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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.