Skip to end of metadata
Go to start of metadata

AHATS status 8/10/08

Staff: Militzer, Oncley, Nguyen, Verstraete with ISS.

Temps: 94F/57F yesterday

Activity highlights:

  • now in array4!!!

For more details, see the ahats logbook at https://wiki.ucar.edu/display/ahatslogbook
...but wiki.ucar.edu has been down this weekend...

Good wind direction:
array#3 (jul 29 12:30 - aug 8 06:00) had 66 hours (13 unstable, 53 stable).
array#4 (aug 9 18:00 - present) has 8 hours (0 unstable, 8 stable).

Local data storage: (we downloaded everything on 30 July)
------------------
upwind: DOWN -- we'll reset today (WiFi data okay
downwind1:/dev/sda1 57685532 7813940 49871592 14% /var/tmp/usbdisk
downwind2:/dev/sda1 57685532 7655580 50029952 13% /var/tmp/usbdisk
profile:/dev/sda1 57685532 6183912 51501620 11% /var/tmp/usbdisk
pressure1:/dev/sda1 3940812 1666816 2273996 42% /var/tmp/usbdisk
pressure2:/dev/sda1 3897204 1397804 2499400 36% /var/tmp/usbdisk

aster:/dev/sdb1 721075720 447126872 273948848 63% /media/isff2
isff:/dev/sdb1 1922890480 627207052 1198006224 35% /media/isff15

Pressure:
--------
(+/- = ~1 std deviation among variables at the same height)

11.b now measuring p with the 202BG connected between the
Bedard port and CHATS reference. P.0m poor name now is the
portable Paroscientific standard with reasonable resolution, but
low sampling rate.

p: ok, +/- 0.03 mb plot scale too large to tell
p'p': ok, +/- 0.0001 mb^2 small but perhaps okay -- only stable data to look at
w'p': ok, +/- 0.001 m/s mb
t: ok, 1 degC
Pref: ok, reconnected to volume at start of this config.
P: ok

Profile: ,select.p
--------
Was kept on during reconfig. Heights of sensors are the same.

T: ok
RH: sensor that is at 5.8m is up to 2% off. Didn't change throughout array #3 period,
now is not important in array #4.

h2o: normal, 2 g/m^3 offset from dat("Q"), except in afternoon.
w'h2o': ok, 0.025 m/s g/m^3 at midday
co2: ok, 14-17 mmol/m^3 (some nights have large values, some don't)
w'co2': ok, -0.01 m/s mmo/m^3 at midday

diag: ok? spikes in 4.8m.
samples.sonic: ok
spd: ok?, 8m now mostly higher than 7m, but could mean 8m is too high (after swap)
We proved that the WiFi antenna was not bothering it...
dir: ok
w: ok
tc: ok, still strange 7m/8m ordering.
w'w': ok
u*: ok, some imaginary values with light winds
sigma_w/u*:
w'tc': ok (lowest near the ground?)
tc'tc': ok

Upwind: ,select.u
----------------

diag: ok, 6u spikes
samples.sonic: ok
spd: ok, +/- 20 cm/s
dir: ok, obviously need new angles
w: ok, +/- 5 cm/s, 11u differs a bit
tc: ok, +/- 0.2 deg, biases somewhat larger
w'w': ok, +/- 0.005 m^2/s^2 (30 min avg for second moments)
u*: ok, +/- 2 cm/s, some imaginary
sigma_w/u*:
w'tc': ok, +/- 0.01 m/s degC
tc'tc': ok, +/- 0.05 degC^2

Downwind Lower: ,select.b
------------------------
Relatively large differences with east winds.

diag: ok
samples.sonic: ok
spd: ok, +/- 20 cm/s, 13b outlier early this morning
dir: ok, need new boom angles
w: ok, +/- 5 cm/s, pitched up a bit (we tightened it a bit too much)
tc: ok, +/- 0.2 deg, biases up to +/-0.8
w'w': ok, +/- 0.01 m^2/s^2 (30 min avg for second moments)
u*: ok, +/- 2 cm/s, some imaginary
sigma_w/u*:
w'tc': ok, +/- 0.01 m/s degC
tc'tc': ok, +/- 0.05 degC^2

Downwind Upper: ,select.t
------------------------

diag: ok
samples.sonic: ok
spd: ok, +/- 10 cm/s, 11t/10t differences (like 13b/12b above)
dir: ok, +/- 2 deg, need boom angles
w: ok, +/- 5 cm/s, a bit pitched up as well
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, som imaginary
sigma_w/u*:
w'tc': ok, +/- 0.01 m/s degC
tc'tc': ok, +/- 0.05 degC^2

----------------------------------------------------------------