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Performance Study of Air Humidity/Water Vapor Monitoring Systems for the CRN

Performance Study of Air Humidity/Water Vapor Monitoring Systems for the CRN. Kenneth G. Hubbard and Xiaomao Lin. High Plains Regional Climate Center. Objectives. Investigate uncertainties of each candidate sensor under lab and field conditions.

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Performance Study of Air Humidity/Water Vapor Monitoring Systems for the CRN

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  1. Performance Study of Air Humidity/Water Vapor Monitoring Systems for the CRN Kenneth G. Hubbard and Xiaomao Lin High Plains Regional Climate Center

  2. Objectives • Investigate uncertainties of each candidate sensor under lab and field conditions. • Determine under what atmospheric conditions the RH sensors show greatest and least agreement (quantitatively), and build correction models if necessary. • Summarize the techniques of calibration and validation, as well as maintenance. Standardize the reporting, delivery, and interpretation of air humidity variable records.

  3. Rationale • High quality air humidity monitoring is essential for a better and more complete understanding of the interactions between the atmosphere and the earth’s surface. • Determining the most appropriate humidity sensor to track air humidity in the CRN is one of the most important aspects of the CRN sensor suite. • Both lab and field evaluation of air humidity sensors are equally indispensable for making a scientific decision: need high accuracy and high fidelity of air humidity records.

  4. Transfer Standard Sensors in the field DewTrackTM Model 200M (Edge Tech) $7,500

  5. Candidate DewPt Sensor Shown in the Field MET-2010 (Yankee Environ.) $4,700

  6. Candidate RH Sensors Shown in the Lab RH sensors installed in CRN aspirated shield MP101A CRN Temp. Sensors, <$2,000 HMP233 HMP45

  7. Candidate RH Sensor Array in field

  8. Data Acquisition • Sampling data: 5 seconds, one minute average output. • RH, Dew point, Air temperature, and related variables • MET-2010 (0.05oC) and RMY (0.1oC) air temperature systems (NIST traceable) as air temperature reference for interpreting related air humidity variables. • Analog output sensors are measured by CR7 datalogger. • Digital output sensors are measured by PC directly. • Real time air pressure is updated into HMP233 sensors for compensating humidity variables each 5 minutes.

  9. Air Temp. Sensor Array in field Sensors/ Shields are: Air pressure ASOS (1088) RMY Pair MMTS Pair Gill CRS

  10. Data Acquisitions

  11. Data Acquisitions Wireless Internet Analog Sensors RH Sensors Dewpoint Temp. Solar Radiation Wind speed Surface Temp. CR10 Datalogger Local PC Server Digital Sensors HMP233 Air Pressure ASOS-1088 MET-2010 PMT-2005 New ASOS RS232 and RS485 Interfaces

  12. Online Monitoring

  13. Field Testing Site

  14. Lab Testing RH Generator (Thunder Scientific) PC monitors RH Generator RH sensors to testing chamber

  15. Lab Testing

  16. Lab Testing

  17. Preliminary Results

  18. Preliminary Results in Lab Testing

  19. What’s Next • Determine the RH sensor dependencies of air temp. air humidity, and air pressure. • Develop correction models. • Install ASOS II sensors

  20. Thank You Air Temperature & RH Monitoring At High Plains Regional Climate Center (HPRCC)

  21. What’s Next

  22. Preliminary Results in Field Testing RH comparison among all RH sensors at site Dewpoint Comparison: ASOS 1088 and HMP233. Dewpoint difference is defined as a difference between a sensor and DewTrack’s reading

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