AHATS daily status 7/09/08
Staff: Semmer, Horst, Khoung, McIntyre; Maclean left this morning
Summary:
We moved the Vaisala barometer from the PAM pressure port to the fast
pressure reference cylinder last night. It appears that the reference
cylinder pressure follows the diurnal cycle of ambient pressure (although
we no longer have an independent measure of ambient pressure).
Today we are testing for leaks by blowing into the reference line
to overpressure it and watching for a decay in pressure indicating a
leak. Steve found one obvious leak where a tee was used instead of a
straight through junction.
Steve has repaired the bad 'filter' boards so that we now have 14 good
pressure/temperature signals, albeit apparently poor pressure data due
to leaks on the reference side.
For more details, see the ahats logbook at https://wiki.ucar.edu/display/ahatslogbook
Good wind direction: For the period 7/7 12:30 through 7/9 12:30, we have
only 5.25 hours (11%) of good data. We no longer are getting good wind
directions either day or night.
Local data storage: (7/9/08)
------------------
Filesystem 1k-blocks Used Available Use% Mounted on
root@upwind root# df | grep usbdisk
/dev/sda1 57685532 1198288 56487244 2% /var/tmp/usbdisk
root@downwind1 root# df
/dev/sda1 57685532 347476 57338056 1% /var/tmp/usbdisk
root@downwind2 root# df
/dev/sda1 57685532 425008 57260524 1% /var/tmp/usbdisk
root@profile root# df | grep usbdisk
/dev/sda1 57685532 1133292 56552240 2% /var/tmp/usbdisk
root@pressure1 root# df | grep usbdisk
/dev/sda1 3940812 396592 3544220 10% /var/tmp/usbdisk
root@pressure2 root# df | grep usbdisk
/dev/sda1 3940812 395692 3545120 10% /var/tmp/usbdisk
Pressure:
--------
Diurnal variation of fast pressure is an order of magnitude less
than ambient pressure.
p: all channels ok as of 10 am PDT this morning
t: all channels ok as of 10 am PDT this morning