Instruments deployed in SHOWEX from the LongEZ group


1. 12 thermocouples are installed on the land tower (lat=36.18261,
long=-75.75135). Due to the
limited lengths of the thermocouple cables, there are more levels
at the top of the land tower than at the bottom of the tower. In
addition, the orientation of the thermocouples varies at all the
levels. Most of them point to NE and NW. There are three
thermocouples installed at the highest level.


2. There are two 3-D Campball csat-3. installed at the end of
the pier (lat= 36.184, lon=-75.745 ). One is on a 3.12m boom, pointing to
340 Deg. (perpendicular to the pier), and 9.14m above the water.
The other one is installed on the tower at the end of the pier at
17.03m above the water, which is about 9.11m above the pier,
pointing to 80 deg. The pier top is
about 7.92m above the water.
The data are recorded 10 samples per second.


Instrument tests:

Thermocouples:

The lower level thermocouples tend to accumulate salt easily.
White salt blobs were observed on the thermolcouple sensors at the
lowest two levels. In addition, the thermocouple probes at the
lower levels were observed wet.
The comparison between salt-blob and clean thermocouple data shows that
the salt blob thermocouple tends to give large temperature
oscillations due to evaporation from the wet thermocouple in
response to wind gusts.

The comparison among the three thermocouples at the highest level
indicates that the direct solar heating has some effect on the
thermocouple since one of the thermocouples is in shade sometimes.

The solar shelter was added to level 5 thermocouple, and moved
next to level 6 thermocouples. The comparison between the two
thermocouples, with and without the solar shelter shows the
amplitude of the temperature variation observed from the one with
the shelter is less than the one without the shelter.

All the thermocouples are calibrated in the ice water 
and in a bottle of distilled water. Temperature differences before
and after the cleaning of thermocouples are observed.


Sonic anemometers:

Friction velocity from two 3-d sonics compare very well based
on two-day data although the data are spiky. The result indicates
that the flow distortion is not a serious problem if the wind is from N.

Smoke bomb tests were done around the pier. The distortion
upstream  of the triangle tower at the end of the pier is not obvious.
The small triangle tower has obvious effects on the flow
through the tower. There is more fine turbulence generated due to
the structure of the tower.