AHATS daily status 7/15/08
Staff: Semmer, Horst, McIntyre, Khoung
For more details, see the ahats logbook at
https://wiki.ucar.edu/display/ahatslogbook
Good wind direction: From July 11, 12:00, until July 15, 12:00, we have had 43.7 hours or 46% good wind directions with continuous periods of at least 25 minutes. This includes 32.67 hours stable data and 10.08 hours unstable.
Local data storage:
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Swapped all local data storage media yesterday.
Pressure:
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(+/- = ~1 std deviation among variables at the same height)
p: ok, +/- 0.02 mb
p'p': ok, +/- 0.002 mb^2
w'p': ok, +/- 0.004 m/s mb
t: ok, +/- 0.3 degC
Pref: ok, range = +/- 2 mb
Profile:
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diag: ok
samples.sonic: ok
spd: ok
dir: ok
w: ok
tc: ok
w'w': ok
u*: ok
sigma_w/u*: ok (1.3 at night)
w'tc': ok
T: ok
RH: 4m may be low by on the order of 1% RH
P: okay
Upwind (hts=3.3):
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diag: ok
samples.sonic: ok
spd: ok, +/- 14 cm/s (6u has +15 cm/s offset in u)
dir: ok, +/- 3 deg
w: ok, +/- 7 cm/s
tc: ok, +/- 0.17 deg
w'w': ok, +/- 0.01 m^2/s^2 (30 min avg for second moments)
u*: ok, +/- 2 cm/s
sigma_w/u*: ok (1.3 at night)
w'tc': ok, +/- 0.02 m/s degC
tc'tc': ok, +/- 0.05 degC^2
Downwind Lower (hts=3.3):
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diag: ok
samples.sonic: ok
spd: ok, +/- 20 cm/s
dir: ok, +/- 6 deg
w: ok, +/- 6 cm/s
tc: ok, +/- 0.25 deg
w'w': ok, +/- 0.01 m^2/s^2 (30 min avg for second moments)
u*: ok, +/- 3 cm/s
sigma_w/u*: ok (1.3 at night)
w'tc': ok, +/- 0.02 m/s degC
tc'tc': ok, +/- 0.08 degC^2
Downwind Upper (hts=4.3):
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diag: ok
samples.sonic: ok
spd: ok, +/- 20 cm/s
dir: ok, +/- 5 deg; 6t is about 6.5 degrees off from profile sonic
w: ok, +/- 6 cm/s
tc: ok, +/- 0.2 deg
w'w': ok, +/- 0.01 m^2/s^2 (30 min avg for second moments)
u*: ok, +/- 3 cm/s
sigma_w/u*: ok (1.3 at night)
w'tc': ok, +/- 0.02 m/s degC
tc'tc': ok, +/- 0.07 degC^2