Abstract
The Suomi National Polar-orbiting Partnership (SNPP) satellite was launched on 28 October, 2011, and carries the Advanced Technology Microwave Sounder (ATMS) onboard. Currently, ATMS performance in orbit is very stable and the calibration parameters (e.g., noise and accuracy) meet specifications. This study documents an ATMS calibration error budget model and its results for community reference. The calibration accuracy is also verified with the ATMS pitch maneuver observations of cold space. It is shown that the ATMS pitch maneuver cold space observations at center positions are inconsistent with the values predicted by the instrument calibration error budget model. The biases also depend on scan angle. This scan-angle dependence may be caused by the ATMS plane reflector emission. Thus, a physical model is developed to simulate the radiation emitted from the reflector and is recommended as part of ATMS radiance calibration to further improve the sensor data record (SDR) data quality.
Highlights
In the past few decades, the observations from Microwave Sounding Unit (MSU) and AdvancedMicrowave Sounding Unit-A (AMSU-A) on National Oceanic and Atmospheric Administration (NOAA) polar-orbiting satellites have been widely used for monitoring global climate change.atmospheric temperature trends derived from these instruments remains a subject of debate.Pioneer investigations by Spencer and Christy [1,2] and their follow-on work at the University of Alabama at Huntsville (UAH) [3,4,5] showed nearly no warming trends for the mid-tropospheric temperature time series derived from the MSU channel 2 (53.74 GHz) and AdvancedMicrowave Sounding Unit-A (AMSU-A) channel5 (53.71 GHz) observations
Advanced Technology Microwave Sounder (ATMS) scan scan angle angle ranges ranges within direction and hashas
After examining the Suomi National Polar-orbiting Partnership (SNPP) ATMS antenna pattern coefficients, we found that for pitch-over observations ATMS sidelobe coefficients at most of channels are very small and are generally less than
Summary
In the past few decades, the observations from Microwave Sounding Unit (MSU) and Advanced. Microwave Sounding Unit-A (AMSU-A) on National Oceanic and Atmospheric Administration (NOAA) polar-orbiting satellites have been widely used for monitoring global climate change. Pioneer investigations by Spencer and Christy [1,2] and their follow-on work at the University of Alabama at Huntsville (UAH) [3,4,5] showed nearly no warming trends for the mid-tropospheric temperature time series derived from the MSU channel 2 (53.74 GHz) and AMSU-A channel. It is generally believed that the uncertainty in the MSU/AMSU-A derived trend arises from calibration corrections made to instrument components, as well as removals of inter-sensor biases and satellite orbital drifts [9].
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