Krochin, Witali (2024). Development and application of a ground-based fully polarimetric microwave radiometer for temperature sounding in the middle atmosphere. (Thesis). Universität Bern, Bern
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Abstract
The ground-based temperature radiometer (TEMPERA) was built by the microwave group at the University of Bern in 2013 and has been operating continuously since 2014. As part of this thesis, several updates to the retrieval algorithm were made in 2022. The main changes, along with other minor updates, are implementing the Zeeman splitting module and an improved tropospheric correction. From the updated TEMPERA dataset, measurements of atmospheric thermal tide amplitudes and phases were derived. To further increase the altitude range for temperature retrievals, a fully polarimetric temperature radiometer (TEMPERA-C) has been developed and is currently measuring at the Jungfraujoch high altitude research station within the framework of a test campaign. Using a digital correlator, TEMPERA-C allows us to derive all four Stokes parameters of the observed radiation. However, fully polarimetric calibration is a non-trivial issue currently being studied by the Community. For TEMPERA-C, a simplified calibration method is being tested. This thesis covers the basics of atmospheric remote sensing, technical and theoretical aspects of temperature retrievals from measurements of the ground-based microwave radiometers TEMPERA and TEMPERA-C, and the newly developed fully polarimetric calibration and retrieval routine. In addition, the basics of middle atmospheric dynamics are discussed, and observations of atmospheric thermal tides are presented.
| Item Type: | Thesis |
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| Dissertation Type: | Cumulative |
| Date of Defense: | 16 October 2024 |
| Subjects: | 500 Science > 530 Physics 500 Science > 570 Life sciences; biology 600 Technology > 620 Engineering |
| Institute / Center: | 08 Faculty of Science > Institute of Applied Physics |
| Depositing User: | Sarah Stalder |
| Date Deposited: | 15 Nov 2024 10:17 |
| Last Modified: | 25 Nov 2024 13:38 |
| URI: | https://boristheses.unibe.ch/id/eprint/5627 |
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