SHTFL
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Reanalysis shows some very large peak values of the sensible heat flux (SHTFL)
in polar regions.  One day, for example, had 1200 W/m**2 SHTFL and 300 W/m**2
LHTFL peak values.  These unreasonably large values were at the edge of the
ice-pack.  Very cold air was coming off the ice pack and flowing over open 
water.  For that day and point in question, the 2 meter temperature was more 
than 20C colder than the open water. 

Is a 1200 W/m**2 sensible heat flux reasonable?  The very cold air off the
ice pack creates a favorable situation for large sensible heat fluxes.  The
temperature difference is very large (> 20C) and the situation is convectively
unstable.  In addition, arctic air is not known for its light wind speeds.
However, an upward 1200 W/m**2 flux is equivalent to making 1 foot of ice 
(0.3 m) per day.  In real life, ice would begin to form and thereby begin to 
diminish the sensible and latent heat fluxes.  If such large values of SHTFL 
did occur, they would only occur briefly until ice began to form.  However, 
Reanalysis uses a prescribed sea-ice (which is either ice-free or ice-covered) 
so model does not have the option of creating sea-ice.

The LHTFL can have large values near the polar ice for the same reasons.