Enabling Value Added Scientific Applications of ICESat‐2 Data With Effective Removal of Afterpulses
| Autor: | Yongxiang Hu, Mark A. Vaughan, Charles R. Trepte, Patricia L. Lucker, Rosemary R. Baize, Stephen P. Palm, Xiaomei Lu, Yuekui Yang, Ali Omar |
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| Rok vydání: | 2021 |
| Předmět: |
Photomultiplier
Leads Glaciology Astronomy QB1-991 Environmental Science (miscellaneous) ICESat‐2 Signal Remote Sensing Snow and Ice Polynas Data acquisition Ice Mechanics and Air/Sea/Ice Exchange Processes Snow Research Letter Instruments and Techniques Global Change ocean subsurface lidar Remote sensing QE1-996.5 Ice Sea Ice Detector Elevation The Ice Cloud and land Elevation Satellite‐2 (ICESat‐2) on‐orbit performance data discoveries and early science Geology PMT Photon counting afterpulses Lidar Cryospheric Change General Earth and Planetary Sciences Environmental science Hydrology Cryosphere Energy (signal processing) Oceanography: Physical |
| Zdroj: | Earth and Space Science (Hoboken, N.j.) Earth and Space Science, Vol 8, Iss 6, Pp n/a-n/a (2021) |
| ISSN: | 2333-5084 |
| Popis: | The Advanced Topographic Laser Altimeter System (ATLAS) aboard the Ice, Cloud, and land Elevation Satellite‐2 (ICESat‐2) has been making very high resolution measurements of the Earth’s surface elevation since October 2018. ATLAS uses photomultiplier tubes (PMTs) as detectors in photon counting mode, so that a single photon reflected back to the receiver triggers a detection within the ICESat‐2 data acquisition system. However, one characteristic of ICESat‐2 detected photons is the possible presence of afterpulses, defined as small amplitude pulses occurring after the primary signal pulse due to photon arrival. The disadvantage of these afterpulses is that they often confound the accurate measurements of low level signals following a large amplitude of signal and can degrade energy resolution and cause errors in pulse counting applications. This paper discusses and summarizes the after‐pulsing effects exhibited by the ATLAS PMTs based on on‐orbit measurements over different seasons and geographic regions. The potential impacts of these after‐pulsing effects on altimetry and ocean subsurface retrievals are discussed. Key Points The effects of after‐pulsing by the Advanced Topographic Laser Altimeter System (ATLAS) aboard the ICESat‐2 satellite are describedThe transient response of the ATLAS receiver is characterized over different measurement regimesThe potential impacts of these detector artifacts on ICESat‐2 science studies are discussed |
| Databáze: | OpenAIRE |
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