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====== Meteorological Tower ======

//Mentor: [[http://www.geomet.uni-koeln.de/das-institut/mitarbeiter/schween/|J.H. Schween]]//

===== Principle =====
The meteorological tower was built in 1963 and 1964 based on the model of the towers in Rookhaven (USA) and Risoe (Denmark). It has a height of
124 m and a triangular cross section. An elevator inside is operated for easy access to the measurement platforms. The tower is steadied from three directions at 40 m and 100 m height respectively.

The tower is located in the northwest of the Jülich Research Center and surrounded by 20 m high forest. The instrumentation allows measurements of wind velocity, temperature and humidity in 8 heights, wind direction in 3 heights and radiation in two heights to provide the local information on wind, air temperature, relative humidty, radiation, and air pressure. Additionally precipitation is registered at ground level.

For more information refer to the [[https://www.fz-juelich.de/de/gs/ueber-uns/meteo/aktuelle-wetterdaten/wetterdaten|webpage at the research center Juelich]].



===== Instrument =====
{{:instruments:tower:p1000243.jpg?200|{{:instruments:tower:wstation_turm1_img.jpg_jsessionid_23df998e5a256f0d63e5d20b39d77dee.jpeg?200|}}{{:instruments:tower:p1000364.jpg?200|{{:instruments:tower:wstation_turm2_img.jpg_jsessionid_23df998e5a256f0d63e5d20b39d77dee.jpeg?200|}}

Meterological station ([[http://www.fz-juelich.de/gs/DE/UeberUns/Organisation/S-U/Meteorologie/wetter/wstation_node.html|120m mast in Jülich at 6°24'34'' east, 50°54'36'' north ]])


===== Data =====
  * If you are interested in receiving data please contact the instrument mentor: // [[http://www.geomet.uni-koeln.de/en/the-institute/rg-crewell/staff-crewell/schween/|J.H. Schween]]//
  * Recent plots can be found in the  [[http://atmos.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser4.html?site=JOYCE&date=2016-10-18&UpperLeft=FZJ-Meteo_Temperature&UpperRight=FZJ-Meteo_Wind-Speed&LowerRight=FZJ-Meteo_Precipitation&LowerLeft=FZJ-Meteo_absolute_Humidity|Quicklook archive]]


Examples of latest available measurements (typically the last week Friday to Thursday):

[[http://atmos.meteo.uni-koeln.de/~hatpro/jue/met/#T_air|{{http://atmos.meteo.uni-koeln.de/~hatpro/jue/met/T_air.png?200|T_air}}]]
[[http://atmos.meteo.uni-koeln.de/~hatpro/jue/met/#RH|{{http://atmos.meteo.uni-koeln.de/~hatpro/jue/met/RH.png?200|RH}}]]
[[http://atmos.meteo.uni-koeln.de/~hatpro/jue/met/#wind|{{http://atmos.meteo.uni-koeln.de/~hatpro/jue/met/wind.png?200|Wind}}]]
[[http://atmos.meteo.uni-koeln.de/~hatpro/jue/met/#ani_prof|{{http://atmos.meteo.uni-koeln.de/~hatpro/jue/met/ani_prof.gif?200|Wind}}]]

From Left to right: Temperature (red), humidity (green), wind (right, blue) and profiles (animation) measured at different heights (i.e. 2, 10, 20, 30, 50, 80, 100, 120m), the brighter the color the higher up. The Animation shows profiles of Temperature (thick red line), Wind (thick blue line) and water vapor mixing ratio (thick green line), fits of profiles according to Monin Obukhov theory (thin lines) as well as up (green boxes on the right) and downwelling (red) and net radiative fluxes (blue). Click on the plots to see more.





===== History =====

We have data available from 1.1.2006. Nevertheless measurements go back to 1961 and the website at Juelich provides [[https://www.fz-juelich.de/de/gs/ueber-uns/meteo/klimastation|Climate data, diagrams, 'meteograms' etc.]] (in German).


===== Specifications =====

^ Parameter  ^ Instrument  ^ height(s)  ^
| Temperature   | ventilated pt100  | 8 heights: 2, 10, 20, 30, 50, 80, 100, 120m  |
| Relative Humidity  | Hair Hygrometer \\ (800 L0-100, [[http://www.lambrecht.net/en/home|Lambrecht, Göttingen, Germany]]) | 8 heights: 2, 10, 20, 30, 50, 80, 100, 120m  |
| wind speed   | cup anemomemter\\ (Lisa, [[http://www.siggelkow-gmbh.homepage.t-online.de/|Sigelkow, Hamburg, Germany]])((bankrupt in 2012 - see [[https://www.wmo.int/pages/prog/www/IMOP/publications/IOM-109_TECO-2012/Session1/P1_08_GonzalezSotelino_intercomp_anemometers_UCCLE.pdf|this wmo report]]))  | 8 heights: 2, 10, 20, 30, 50, 80, 100, 120m  |
| wind direction   | wind vane\\ (Rita, [[http://www.siggelkow-gmbh.homepage.t-online.de/|Sigelkow, Hamburg, Germany]])  | 3 heights: 30, 50, 120m  |
| up- and downwelling radiation   | Pyrradiometer\\ (8111, [[http://www.schenk.co.at/|Schenk]], Vienna, Austria)   | 2 heights: 30, 120m  |
| Pressure   | Barometer\\ (5002.0000, [[http://www.th-friedrichs.de/|Th. Friedrichs]], Schenefeld, Germany)   | at foot of tower, 2m  |
| Precipiation   | Ombrometer\\ ([[https://thiesclima.com/|Thies Clima]], Göttingen, Germany)   | at foot of tower, 1m  |