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Atmospheric Emitted Radiance Interferometer (AERI)

Mentor: Ulrich Löhnert


The AERI is an operational infrared spectrometer that measures the downwelling infrared radiance from 3.3-19 µm at 1 cm-1 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-1 and 2223-2260 cm-1 (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-1 and 1250-1350 cm-1 (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-2) 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 (CO2, CH4, N2O).



Period Place Project
May 13, 2011 - today Forschungszentrum Jülich JOYCE


  • Current observations:


Period Place Project
May 13, 2011 - today Forschungszentrum Jülich JOYCE


Parameter Specification Remark
Spectral range receiver 1 5-19 µm corresponds to 2000 to 520 cm-1
Spectral range receiver 2 3.3-5 µm corresponds to 3000 to 1800 cm-1
Spectral resolution 1 cm-1
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
instruments/aeri/aeri.txt · Last modified: 2021/01/22 22:17 by