Single-Point Calibration for Microwave Sounders: Application to TEMPEST-D
نویسندگان
چکیده
Abstract Passive microwave sounders are critical for accurate forecasts from numerical weather prediction models. These sensors calibrated using a traditional two-point approach, with one source typically free-space blackbody target and the second clear view to cosmic background, commonly referred as “cold space.” Occasionally, or both of these calibration sources can become corrupted, either by solar/lunar intrusion in cold space thermal instability source. A Temporal Experiment Storms Tropical Systems (TEMPEST) sounder instrument is currently deployed on International Space Station (ISS) 3-yr mission. TEMPEST also view; however, will be routinely obstructed objects present ISS. Here we test an alternative single-point methodology that uses only target. We find brightness temperature difference between this new approach <0.1 K when applied 3 years CubeSat Demonstration (TEMPEST-D) mission data 2018 2020. This applicable other radiometers experience occasional degradation sources, such effects, intrusions, noise diodes. Significance Statement Cross-track have relied two distinct often background ambient tested single target, making sensor robust field-of-view intrusions alternatively simplifies spaceborne design eliminating need space. performance two-calibration indistinguishable temperature/water vapor profiling precipitation-rate estimation. technique past, current, future help diagnose systematic uncertainties targets.
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ژورنال
عنوان ژورنال: Journal of Atmospheric and Oceanic Technology
سال: 2023
ISSN: ['1520-0426', '0739-0572']
DOI: https://doi.org/10.1175/jtech-d-22-0063.1