Causes and effects of AIRS optics temperature cycles

Evan M. Manning; Hartmut H. Aumann; Thomas S. Pagano; Steven Broberg; Rudolf A. Schindler; Kenneth Overoye

doi:10.1117/12.2567458

20 August 2020 Causes and effects of AIRS optics temperature cycles

Evan M. Manning, Hartmut H. Aumann, Thomas S. Pagano, Steven Broberg, Rudolf A. Schindler, Kenneth Overoye

Proceedings Volume 11501, Earth Observing Systems XXV; 115010B (2020) https://doi.org/10.1117/12.2567458
Event: SPIE Optical Engineering + Applications, 2020, Online Only

Abstract

In addition to the expected orbital thermal cycle, geophysical conditions with high thermal and reflected upwelling infrared (IR) drive measurable changes in the AIRS instrument with a period of 24 hours. Especially hot and bright scenes are important, with about 30% of the variability driven by thermal IR and 70% by reflected IR. We show how these cycles manifest in the instrument telemetry for temperatures and gain and with careful analysis can even be detected in spectral shifts. Thermal cycles are an unavoidable feature of instruments observing upwelling radiances from Earth, because the signal inherently carries varying amounts of energy into the instrument. Temperature control of the optical bench, on-board calibrator blackbody, and Focal Plane Array (FPA) in AIRS reduce the impacts of temperature variability to extremely small levels. This combined with good on-board telemetry of the temperatures and including temperature variability in our calibration algorithm has resulted in an instrument that achieves ‘climate quality’ measurements. Careful instrument and algorithm design allows us to characterize and document the impact of temperature variability and limit the effects to negligible levels, helping the instrument meet important climate-quality criteria specified in Ohring 2005.

Conference Presentation

Citation Download Citation

Evan M. Manning, Hartmut H. Aumann, Thomas S. Pagano, Steven Broberg, Rudolf A. Schindler, and Kenneth Overoye "Causes and effects of AIRS optics temperature cycles", Proc. SPIE 11501, Earth Observing Systems XXV, 115010B (20 August 2020); https://doi.org/10.1117/12.2567458

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available