Hydrologylec14_evap_meas

103overoceans highoverareaswheresensibleheat

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Unformatted text preview: ters
 Energy
Balance
Approaches

 •  Bowen
Ra+o
 •  ra+o
of
sensible
heat
 to
latent
heat
flux


 
B=
SH/
LE
 •  possible
by
 measuring
the
 difference
between
 temperature
and
 vapour
pressure
at
 two
levels

 2 3/1/12 Bowen
Ra+o
 Bowen
Ra+o
 •  Evapotranspira+on
can
be
solved
as:
 •  low
for
areas
where
most
of
radia+on
is
used
 for
evapora+on
(0.1‐0.3
over
oceans)


 •  high
over
areas
where
sensible
heat
 dominates
(as
high
as
10
over
deserts)

 •  Measurement
requires
several
simultaneous
 measurements
breaks
down
in
evening
and
 morning
when
sensible
heat
becomes
 nega+ve,
or
when
Rn‐G
is
nega+ve
(at
night)
 •  Where:

 γ •  the
psychrometric
constant...
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This note was uploaded on 10/22/2012 for the course GEOG 3610 taught by Professor Berg during the Spring '11 term at University of Guelph.

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