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For more details, see the ahats logbook at https://wiki.ucar.edu/display/ahatslogbook
Good wind direction: The standard function reports 36 hours (14
unstable, 22 stable) in this configuration, with small segments the
last 2 days. However we have had some sensors and data systems down
(and still don't know about pressure measurements) so the actual
numbers would be lower.
...
Pressure:
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(+/- = ~1 std deviation among variables at the same height)
pressure2 ADAM died last night at ~0030 local. Also, lots of playing around
with plumbing yesterday.unmigrated-wiki-markup
\[redo, smaller time period\]
It appears that most of the "signal" is variation of the reference pressure.
We changed its character (for the better?) by changing from the nitrogen
cylinder to the CHATS 1 liter reservoir yesterday, however there still is
too much variation. We'll try building yet another reservoir today.
p: ok, +/- 0.03 mb
p'p': ok, +/- 0.002 mb^2
w'p': ok, +/- 0.001 m/s mb
t: 6b&6t are outliers by 3degC during day, others +/- 1.5 degC
(may be orientation of sun shields?)
Pref: still steadily drifting low, though a bit of a diurnal cycle now.
(might be cooling of the reservoir)
now 14mb below ambient.
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Serial boards crashed 3 nights ago at \ ~1AM and was restarted the next morning.
Okay since then.
T: ok
RH: 4m looks different even after the sensor swap 3 days ago. We'll try
exchanging sensors between levels next.
P: okay
diag: ok
samples.sonic: ok
spd: ok?, 8m still lower than 7m sometimes.
dir: ok
w: ok
tc: ok, 8m low by ~0.3 degC? (related to the speeds being low as well?)
w'w': ok
u*: ok, lots of imaginary values with light winds
sigma_w/u*: ok (1.3 at night)
w'tc': ok
h2o: ok?, 2 g/m^3 offset from dat("Q"), except in afternoon.
w'h2o': ok, 0.03 m/s g/m^3 at midday
co2: ok, 15-20 mmol/m^3 (Large values at night except for the period
11-21 July. Does this indicate shallow stable boundary layers sometimes?
We should check ISS data.)
w'co2': ok, -0.013 m/s mmo/m^3 at midday
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Has crashed each of the last 3 nights at about 10pm. Didn't fix it until
the next morning on the first night. Have been able to get it running
by midnight the last 2 nights.
diag: ok
samples.sonic: ok
spd: ok, +/- 10 cm/s
dir: ok, mean offsets of up to 13deg -- need to enter new Vazimuths??
w: ok, +/- 5 cm/s
tc: ok, +/- 0.2 deg,
w'w': ok, +/- 0.005 m^2/s^2 (30 min avg for second moments)
u*: ok, +/- 2 cm/s, again some imaginary values
sigma_w/u*: ok (1.3 at night)
w'tc': ok, +/- 0.01 m/s degC
tc'tc': ok, +/- 0.05 degC^2unmigrated-wiki-markup
Downwind Lower (hts=3.3): \ [,select.b\]
\
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Wiki Markup
samples.sonic: ok
spd: ok, \ +/\- 30 cm/s
dir: ok, \ +/\- 3 deg
w: ok, \ +/\- 15 cm/s \ [need to check tilt angles\]
tc: ok, \ +/\- 0.2 deg
w'w': ok, \ +/\- 0.01 m^2/s^2 s^2 (30 min avg for second moments)
u*: ok, \ +/\- 2 cm/s, some imaginary mid-day
sigma_w/u*: ok (1.3 at night)
w'tc': ok, \ +/\- 0.01 m/s degC
tc'tc': ok, \ +/\- 0.05 degC^2unmigrated-wiki-markup
Downwind Upper (hts=4.3): \ [,select.t\]
\
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diag: ok
samples.sonic: ok
spd: ok, +/- 10 cm/s, 3t lower by 20cm/s
dir: ok, +/- 2 deg, 3t now outlier
w: ok, +/- 5 cm/s, 5t&6t outliers
tc: ok, +/- 0.2 degC, offsets up to 0.6 degC
w'w': ok, +/- 0.01 m^2/s^2 (30 min avg for second moments)
u*: ok, +/- 2 cm/s, again imaginaries
sigma_w/u*: ok (1.3 at night)
w'tc': ok, +/- 0.005 m/s degC
tc'tc': ok, +/- 0.05 degC^2
...