===== Atmospheric Emitted Radiance Interferometer (AERI) =====
//Mentor: [[ulrich.loehnert@uni-koeln.de|Ulrich Löhnert]] //
 
===== Principle =====
The AERI is an operational infrared spectrometer that measures the downwelling infrared radiance from 3.3-19 µm at 1 cm<sup>-1</sup> resolution. Like the microwave spectrum, the infrared spectrum also contains information on the vertical profile of temperature and humidity. Spectral observations from 612-713 cm<sup>-1</sup> and 2223-2260 cm<sup>-1</sup> (i.e., measurements from the 15 µm and 4.3 µm CO2 bands, respectively) are used for temperature profiling, and observations from 538-588 cm<sup>-1</sup> and 1250-1350 cm<sup>-1</sup> (i.e., measurements from the wings of the rotational and 6.3 µm water vapor bands, respectively) for water vapor profiling. Additionally, selected window channels provide information on low-LWP (< 50 gm<sup>-2</sup>) liquid water cloud effective radius and cloud optical depth as well as ice clouds and aerosol. Currently, our AERI is also used for columnar trace gas retrieval (CO<sub>2</sub>, CH<sub>4</sub>, N<sub>2</sub>O).  
===== Instrument =====
{{:instruments:aeri:aeri01.jpg?350|}}

AERI (series 111) at [[http://www.fz-juelich.de/|Forschungszentrum Jülich]] on the roof of the IEK-8 ([[http://www2.fz-juelich.de/icg/icg-2/|Institut für Energie- und Klimaforschung: Troposphäre]]).
===== History =====
^  Period  ^  Place  ^  Project  ^
|  May 13, 2011 - today | Forschungszentrum Jülich | JOYCE |

===== Data =====

  * If you are interested in receiving data data please contact: [[http://www.geomet.uni-koeln.de/allgemein/das-institut/mitarbeiter/detailansicht/f93e43fbbe15a16f8a85792ec07ed119/?tx_wtdirectory_pi1[show]=42&tx_rggooglemap_pi1[poi]=42|U. Löhnert]]
  * [[http://atmos.meteo.uni-koeln.de/~hatpro/dataBrowser/dataBrowser4.html?site=JOYCE&date=-1&UpperLeft=AERI_spectrum1&UpperRight=AERI_status&LowerRight=AERI_rh_dewpt&LowerLeft=AERI_temp_wvmr|Quicklooks archive]]
  * [[http://webmads.ssec.wisc.edu| AERI on webmads link]]: This link shows the current observation of AERI instruments around the world  

  * Current observations:
{{http://atmos.meteo.uni-koeln.de/~hatpro/jue/aeri/AERI_jue_1.png?nocache&w=600}} \\
===== History =====
^  Period  ^  Place  ^  Project  ^
|  May 13, 2011 - today | Forschungszentrum Jülich | JOYCE |
===== Specifications =====
^  Parameter  ^  Specification  ^  Remark  ^
|Spectral range receiver 1 | 5-19 µm | corresponds to 2000 to 520 cm<sup>-1</sup> |
|Spectral range receiver 2 | 3.3-5 µm | corresponds to 3000 to 1800 cm<sup>-1</sup> |
|Spectral resolution | 1 cm<sup>-1</sup> |  |
|Number of channels | ~2500 per receiver|  |
|Front end | gold-coated mirror, optical paths redirect radiation into back end |  |
|Calibration targets | 2 black bodies (ambient and hot load) | 3rd target optional  |
|Back end | FT-IR (Fourier Transform Infrared) spectrometer (ABB) |  |
|Temporal resolution | ~1 min for one spectrum | 142 interferometer sweeps / min.  |
|Manufactorer | ABB Analytical Business, Québec, CANADA |   |