Available in standard lengths of 3, 8 and 12 meters. For longer cable lengths a user supplied junction box or connector may be used. Overall height: 37 cm Wind Sensor Interface Signal outputs: Marine Wind Monitor.
Quantity discounts applied during checkout. Excludes sensor cables. Dimensions: Overall height: 37 cm Propeller: 1. Potentiometer excitation: 15 VDC maximum.
Nominal values, determined in accordance with ASTM standard procedures. The weather station located at the field station was originally installed by the Arctic LTER ecosystems. The field station is an ideal location for maintaining long-term weather data, as it is located in a data sparse region and adds a data point along the north-south transect of the Northslope of Alaska, following along the Dalton Highway.
There is year round access and a long-term pre-existing dataset. These advantages make it possible to provide quality data - a often difficult achievement in remote northern latitudes in Alaska. To access the historical data from this weather station, please refer to Weather Data Query.
Data collected includes air temperature, relative humidity and wind speed, wind direction, global solar radiation, photosynthetically active radiation, barometric pressure, precipitation, soil temperatures, lake temperature, lake depth, precipitation and evaporation pan depth and pan water temperature.
Most sensors are read every minute and then averaged or totaled every hour. The exceptions are soil temperatures, lake temperature, lake depth, and evaporation pan depth and pan water temperature which are read on ten minute intervals and averaged every three hours. Pan evaporation and pan water temperature are only measured during the summer months.
For photosynthetically active radiation sensor no attempt is made to correct for frost or snow on the sensors during the winter months. As of , global solar radiation sensor is equipped with a heater and ventilation system to remain snow and frost free throughout the year. Years prior to , the global solar radiation was not kept free from frost or snow.
Please note this when viewing radiation data. The anemometer is located on a 44'-tall mast and records wind data at sec. To access these data, please go to data. For other weather data in the area, please see the NWS weather data viewer found here. Our summer tipping bucket was able to cover that outage, however two snow events occurred during the outage of the year-round gauge, the timing and volume of these events were likely not measured accurately by the tipping bucket.
The exact timing and volume of these events were not measured accurately. Note: During winter the sensors are affected by rime ice that prohibits the propellers from spinning at low wind speeds. Rime can only build up when there is very little wind, so it is difficult to know if they are reporting low or zero wind speeds due to ice or actual conditions.
However, a best attempt was made to replace steady zero values with NAN. Young because it provides a more complete data-set. Readings from the instruments are nearly identical. Young was installed at the same time also at 5 m. Its data is available upon request but for is not output through this website. Height: 1. Data from will be shifted to match, will start new depth.
Sensor is installed in pipe mounted to a large concrete anchor in such a way that the sensor can be removed and reinstalled to exact same location if needed for repair or replacement. Pressure reported here is uncorrected for sea level. Add 85 millibar to correct for sea level.
The snow depth sensor cannot always detect early small quantities of snow that do not completely cover the vegetation. Therefore early snow events may not be recorded here. Check the webcam or calculate the albedo for information on the discontinuous snow season. Snow depth data can be noisy due to blowing snow or very low density snow.
In order to produce the 3 hour data, we took samples every 5 minutes. We wrote a script that removed instances where there was more than a 1. Once a data point was removed, the filter was stricter for immediately following measurements to be included. We also manually corrected a handful of points. We then filled in the removed 5 minute points through linear interpolation and applied a 3 hour moving average. Note that raw logger files record midnight as of the following day, while the website's database converts midnight to of the current day.
If you are comparing data downloaded from the website to a raw data file, you may need to convert one of your data sets. Datalogger: CR Campbell Sci 14 differential 28 single-ended analog input channels.
A PRT attached to the multiplexer's grounding bar provides a temperature reference for the thermocouple measurements. The heat capacity of the grounding bar and an insulated aluminum cover reduce thermal gradients along the length of the multiplexer.
Reducing the thermal gradients allow more accurate measurements. Response time 18 s. The pyranometers and pyrgeometers measure shortwave and long-wave infrared radiation, respectively. There is also an internal thermistor for temperature correction and a heater to prevent frost deposition.
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