TITLE: Mesonet Arizona Meteorological Network (AZMET) Data CONTACTS: http://cals.arizona.edu/azmet/ azmet@ag.arizona.edu 1.0 DATA SET OVERVIEW This data set contains hourly resolution surface meteorological data from the Arizona Meteorological Network (AZMET). These 28 stations are located across the state of Arizona. This data set covers the period from 1 January to 31 December 2004. The data are in comma delimited ASCII format. 2.0 INSTRUMENT DESCRIPTION Information in this readme is from the AZMET Network home page at: http://cals.arizona.edu/azmet/ 2.1 Instrumentation Measurement Instrument Model Sensor Type Siting Accuracy ----------- ---------------- ----------- ------ -------- Air Temp. Vaisala Thermistor 1.5 m +/-0.4C 1992-Present HMP35C, HMP45C Fenwall Above (UUT51J1) Surface Rel. Humidity Vaisala Vaisala 1.5 m +/-2%RH 1992-Present HMP35C, HMP45C Capacitive Above Surface Soil Temp. Thermocouple Type 1 5,10 cm +/-0.2C Copper- Depth constantan Bare Surface Solar Radiat. LiCor LI200S Silcon Cell 2.5m +/-5% Pyranometer Pyranometer Above Surface Precipitation Sierra Misco Tipping Gage Top +/-1mm RG2501 Rain Bucket With At ~43 cm Gage Magnetic Above ReedSwitch surface Texas Electronics Tipping Gage Top +/-1mm Model # TE525 Bucket With At ~43 cm Rain Gage Magnetic Above Reed Switch surface Wind Speed Met One Model Anemometer 3.0 m +/-1.5% 014A Wind Speed Using Reed Above Sensor Switch Surface RM Young Anemometer 3.0 m +/-0.5 m/s Wind Sentry Generating Above Model 03101-5 AC Voltage Surface Wind Direct. Met One Model Wind Vane 3.0 m +/-5 degrees 024A Wind Dir. Attached to Above Sensor Potentiom. Surface RM Young Wind Vane 3.0 m +/-5 degrees Wind Sentry Attached to Above Model 03301-5 Potentiom. Surface Each AZMET weather station is controlled by a Campbell Scientific Inc. datalogger. The sampling rate is every 10 seconds. At the end of each hour, the datalogger processes and stores all the sampled measurements for that hour. Rain and solar measurements are totalized. Soil temps are point measurements taken on the hour, and all other readings are averaged from measurements during the hour. An AZMET hour starts at one second after the hour and goes to the top of the next hour. For example, the data listed for the 8:00 hour are measurements from 7:00:01 to 8:00:00. At midnight, the datalogger processes all the 10 second measurements, picks out the daily maximums and minimums, and calculates the daily averages, and totals. An AZMET day begins one second after midnight. AZMET is on Arizona time; Mountain Standard Time. Arizona does not adjust clocks for daylight savings time. Once a year, we replace all the Solar sensors and Wind Speed sensors with recalibrated sensors. Humidity sensor chips are replaced twice a year. Other sensors are carefully monitored and checked during each station visit. 2.2 Station Locations Station locations can be found in the file azmet_sites.txt included along with your data order. 3.0 DATA COLLECTION AND PROCESSING See above. Further information is available from the AZMET home page: http://cals.arizona.edu/azmet/ UCAR/JOSS conducted no processing or quality control on these data. 4.0 DATA FORMAT AND FILE NAMING 4.1 Data Format These data are in comma delimited ASCII format. DATA POINT NUMBERS --> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 | | | | | | | | | | | | | | | | | 92,254,1,20.9,42.2,1.4,0,0,25.5,27.6,1.6,1.3,147,33,2.6,.05,.34 DATA --> 92,254,2,19.5,49.8,1.1,0,0,24.8,27,1,.8,192,37,1.5,.03,.28 92,254,3,19.1,51,1.1,0,0,24.2,26.5,1,.8,236,41,2.3,.03,.26 92,254,4,18.1,55.1,.9,0,0,23.7,26,1.3,.8,289,48,2.5,.02,.22 Data Point Description -------- ----------------------- A 1 Year (86,87,88,89,90 etc) B 2 Day of Year C 3 Hour of Day D 4 Air Temp. E 5 Rel. Humidity F 6 Vapor Pressure Deficit G 7 Solar Radiation H 8 Precipitation I 9 2" Soil Temp. J 10 4" Soil Temp. K 11 Wind Speed (Ave) L 12 Wind Vector Magnitude M 13 Wind Vector Direction N 14 Wind Direction Standard Deviation O 15 Max Wind Speed P 16 Reference ET Q 17 Heat Units (30/12.8 C) (86/55 F) 4.2 File Naming conventions StationName_2004data.txt e.g. Safford_2004data.txt 5.0 DATA REMARKS None. 6.0 REFERNCES None.