- Lidars
a. 2 scanning
One of the systems we plan to
deploy will be one that is developed in-house. The other system will be a
commercial system that we are in the process of procuring (and as such we
cannot answer the particulars of make and model number because the award has
not been made).
Generally speaking, the
commercial system and the other potential in-house system we are developing are
micropulse systems that will not be as sensitive as HRDL. Under similar
conditions, we would expect these systems to have 2-4 km range and be able to
make measurements through the depth of the boundary layer. Most likely,
these systems will have to integrate longer, so we would expect 2-4 second
estimates of range resolved, radial wind speed and aerosol backscatter
intensity.
b. 1 doppler
NOAA High Resolution Doppler
Lidar (HRDL)
Web Page: http://www.esrl.noaa.gov/csd/groups/csd3/instruments/hrdl/
Data produced: Range-resolved
estimates of line of site wind speed and aerosol backscatter signal strength
Resolution: 2 Hz / 30m range
Coverage: Depends on aerosol
concentration - during typical conditions the max range is 4-6km;
vertically through the depth of the Boundary layer.
Scanning: Full hemispheric
Example of HRDL data from an
experiment of similar operational coverage: http://www.esrl.noaa.gov/csd/groups/csd3/measurements/txflux/
c. 2 floating lidar buoys (also, what is the maximum water
depth that these can be deployed?)
The lidar buoys are the
WindSentinel Resource Assessment Buoy manufactured by AXYS Technologies Inc.
Measurements (all with
user-definable averaging intervals from 1 s) include:
Lidar: Vector wind from
Vindicator III lidar, user-definable averaging interval, six measurement
heights between 30 and 200 m
Cup anemometer for surface
wind speed
Directional wave spectrum
Surface barometric pressure
Surface air temperature and
humidity
Water temperature
Water velocity profile (to 90
m) via acoustic Doppler profiler
Solar radiation
Water temperature and
conductivity profile
The instruments are mounted
on a NOMAD buoy. This buoy design is capable of deployment in waters several
thousand meters deep.
2. Sodars
a. 6
Two SODARs are Scintec models
SFAS and MFAS with antenna heating.
The links are as follows:
•
SFAS http://www.scintec.com/english/Web/Scintec/Details/A031010.aspx
• MFAS http://www.scintec.com/english/Web/Scintec/Details/A032010.aspx
One sodar is a Scintec MFAS
Doppler sodar. This sodar provides measurements of wind speed and wind
direction as a function of height. The spatial coverage is variable depending
on conditions, but can range from several hundred meters (in dry environments) to
a kilometer (in more humid conditions like Oklahoma City). The time resolution
and vertical resolution can be selected by the user, but we have generally done
15 or 30 minute averages and range gates of 10 to 20 m.
Three sodars are custom built
and vertically pointing with a height of coverage of 200m. They will measure
horizontal wind and the vertical component of the wind speed (turbulence). The
time resolution is 15 minutes with a vertical resolution of 5 m. Time
resolution is as short as 1 min or less, if desired. They measure both the mean
and standard deviation of vertical velocity (and other radial
components). The standard deviation of vertical velocity is a measure of
turbulence.
Can you please answer the
following question about these instruments?
1. Radiometers – Can
you please provide more information on the ECOR Flux module?
The ECOR/SEBS system
replicates the ECOR/SEBS systems used in ARM at the TWP and NSA sites (see the
ARM ECOR and SEBS web sites for more information at http://www.arm.gov/instruments/ecor
and http://www.arm.gov/instruments/sebs).
The instrumentation is mounted on a tripod (not a tower section as shown on the
ARM ECOR web page) and includes a 3D sonic anemometer, H2O/CO2
sensor, net radiometer (shortwave and longwave components), three soil heat
flow sensors, three soil moisture sensors, three soil temperature sensors (the
latter three for near surface measurements), and a wetness sensor. The
electronics for the system are mounted in a weatherproof stainless steel
enclosure.
2. Anemometers
a. Sonic - 13 – how many of these are 2-D vs. 3-D?
All sonic anemometers are
3-D.
3. Sensors
a. Energy Balance Bowen
Ratio System – Can you please provide more information on this system?
The Energy Balance Bowen
Ratio system is the same as those used in the ARM program (see the ARM EBBR web
site http://www.arm.gov/instruments/ebbr).
The only difference is that it's mounted on two tripods instead of the pipe
framework shown in the picture on the web site. Sensible and latent heat flux
are calculated based on the energy balance, using gradients of temperature and
relative humidity measurement, net radiation, soils measurements ( like the
ECOR/SEBS), wind speed and direction, and atmospheric pressure.
4. Surface weather
stations
a. 10 – What will these
systems be mounted on (i.e., 2 m tripod, 10 m tower)?
The anemometers are mounted
at the top of a tripod approximately 3 m tall. The towers include thermometer,
hygrometers, and barometers in addition to the anemometers. Some also can be
equipped with radiometers.
Anemometer: RM Young model
05106
Barometer: Vaisala model
PTB101B
T/RH Sensor: Vaisala model
HMP45C