FLOSS01: Snow_Precip Messages: 10 Entries..

At 13:45 visited tower and inspected precipitation guage.
The top of the cylinder is level, E-W, N-S.
The wind baffles are installed with the concave side outermost.
The stakes are firm

Place plastic toboggan atop small step ladder positioned under the ultrasonic
detector from 10:11 to 10:27. Surface 86 cm below sensor

Placed chem shelter door atop toppled step ladder from 10:28 to 10:39. Surface
1.7 m below sensor.

01/04/2002

Placed short step-ladder under snow depth sensor
13:00 installed ladder
16:10 removed,

Note Thermocouple was inside and the cap was on.
It was pulled outside at 16:10 such that it won't
be seen by the sun (ie ~1cm under the box).

The cr10 that is sampling the snow depth gauge also outputs
a temperature used in the calculation, which we have not been
parsing (and therefore does not appear in the archive).

At 17:25 MST Dec 26 cosmos was rebooted with a new sio_converter
for channel 201 which parses the temperature. 

The new variable was first called Tsnow - which is perhaps a bad 
choice since it isn't a snow temperature.

Later the snow depth variables were renamed and covars rerun back
to Dec 10. (In the field version of the netcdf files the original
names will still exist in files up to Dec 28).

	depth.snow.main	->  Depth.snow
	Tsnow.main	->  Tdepth.snow

I would guess that the snow depth gauge has a temperature sensitivity, though
perhaps it drifts as well.   I just tried:
    plot(dat("T")[,"T.1m"]*2.5+2100-dat("depth"),ylim=c(-200,200))
which looks like it removes some drift, but perhaps gives a signal which isn't
correct either.

Add to the list of one-time tasks:
- put stool under snow gauge
- let it sit for a period during which the temperature changes (several hours)
- remove stool
- log "stool" time in logbook

The tips from the rain gauge during my calibration at about 12:35 were:
5, 7, 7, 7, 8, 7, 2 = 43 tips total
This sounds like a reasonable number.  The CASES97 logbook says that we would
expect 44!

This afternoon (~4:00), I reseated the connectors for the rain gauge.  I had
the idea that it wasn't completely seated at the CR10 side.  Now, I see a single
tip which should have been due to the 1/4" of fluffy snow we just had.  I might
have been tempted to try another calibration, but I didn't have any water left.
I've refilled it now and will try again tomorrow.

In a further attempt to check the snow depth gauge, I just placed the small
stool underneath it for about 5 minutes.  The stool height is 11 7/8".

The change was obvious even in cockpit.
The numbers are:
2056-1764=292 (should be 300)

I also put some 2x4 boards under the depth gauge from about 10:30-10:40.  First,
about 1 min with 2" (1.5") thickness, then about 9 min with 4" (3.5") thickness.
Cockpit didn't show much change -- I'll look at data now.

The data appear to be:
2070 - pre test
1999 - 2x4 thin     dh = 71mm (should be 38 + grass bed -- 33?)
1962 - 2x4 thick    dh = 37mm = (should be 51)
2062 - post test    dh = 100mm = (should be 51 + grass bed)

These aren't quite right.  Also, I'm puzzled by the timing, since the "1999" values were before I did anything.

I'll try a slightly different test later.

About 10:30, I dumped a whole bunch of water into the rain gauge, but didn't 
see any response on the cockpit display.  I'll look at the raw data to see
if I should have seen it.

I've looked at the data -- there were no non-zero values.  Rain gauge data isn't
getting in.