TA-49 Station Description
Alternate Name(s): Bandelier
The TA-49 station includes a 46-m tower instrumented for wind and temperature
at three levels and near-surface instrumentation for measuring temperature,
moisture, precipitation, and shortwave solar irradiance. See Table 13.4 in the
Monitoring Plan for measurement details and Table 13.3 in the same document
for definitions of variables.
||June 24, 1987
||June 24, 1987
The TA-49 station is located on the Pajarito Plateau on high ground between
two small tributaries of Ancho Canyon. The view of the station, as shown in the
above photograph, is looking east toward the Sangre De Cristo Mountains. The station's tower is seen in the
middle of the photograph. The fetch within a few
hundred meters of the tower is over short grasses and widely scattered low
shrubs. In the vicinity of the tower, the plateau tilts at about 2.3 degrees to
the east-southeast. The terrain slopes gently to the south and more
abruptly to the north into the two tributaries of Ancho Canyon.
Location and Elevation:
|NAD 27 State Plane Coordinates (ft)
|UTM, Zone 13 (m)
|Longitude & Latitude
||106° 17' 57.5"
||35° 48' 47.9"
Station elevation is 7045 ft (2147.9 m) above sea level.
The tower is LANL structure no. TA-49-0123, and the datalogger shed is LANL
structure no. TA-49-0138.
For the most part, all suspect data have been replaced with an asterisk (*).
Occasionally you will see days on which all the 15-min data appear good, but
some of the 24-h summary values are missing. Lightning strikes, momentary power
outages, or the need to reload the datalogger program may be the cause. In these
cases, you can estimate a 24-h value from the 15-min data.
See Section C.1.b and c of the Meteorological
Monitoring Plan for details on sampling and general remarks concerning
Qualifying remarks are organized by data type (for example, wind, atmospheric
state, etc.), and we use our standard variable names, as defined in Table 13.3
of the Meteorological
Wind direction measurements (dir) from November 8, 1989, to April 19, 1990,
were affected by an inappropriate resistor in the circuit. Because of the
averaging done in the datalogger, there is no accurate way of reconstructing
these data. If you need wind direction data during the period of time, contact a
The measurement of the vertical velocity (w) has been multiplied by
1.25 to correct for the non-cosine response of the propeller. All quantities
derived from the w signal include this correction. The w signal is
occasionally affected by wet snow and ice. Although we have attempted to edit
the data when this happens, you will occasionally see periods of several hours
when w and its standard deviation (sdw) go to zero during the
winter; a frozen propeller is the cause.
Most of the instantaneous wind gust directions (dirgst) are erroneous.
Atmospheric State Variables:
Occasionally one encounters relative humidity (rh) values exceeding
100%; we recommend changing these values to 100%.
No known problems.
Radiative Energy Variables:
During and for some time after periods of snow or frost formation, the dome
of the upward looking pyranometer may become snow or ice covered. In such
instances the shortwave irradiance (swdn) is diminished. Our editing has
not been consistent: In portions of the record we attempted to remove these snow
and frost effects and in other portions we decided not to edit. In general, it
is difficult to decide when the melting is complete and the signal is back to
As a result of a change in the calibration standard used by the manufacturer,
measurements of swdn are 5% too large from the beginning of the record to February 22, 1995
at 0915 MST.