Retrieving cloud ice masses from geostationary images with neural networks
Licentiatavhandling, 2023
This thesis challenges the traditional approach by applying supervised learning against CloudSat collocations, the only existing satellite mission targeting ice clouds. A set of neural networks is assembled to compare the performance of using different visible or infrared channels as retrieval input as well as the added value of using spatial context. The retrievals are probabilistic, in the sense that all neural networks predict quantiles to estimate the retrieval irreducible uncertainty, and thus represent the state of the art for atmospheric retrievals.
With several spectral channels, infrared retrievals are found to have a similar performance compared to the peak accuracy offered by the combination of visible and infrared channels. However, the infrared-only retrievals enable a consistent diurnal performance. The use of spatial information reinforces the retrievals, which is demonstrated by the ability to provide skilful three-dimensional estimates of ice masses, known as ice water content, from only one infrared channel. The latter retrieval scheme is supported by an extensive validation with independent measurements.
These neural network-based retrievals offer the possibility to derive new insights into cloud physics, reduce present ice cloud uncertainties, and validate climate models. Ideally, such retrieval schemes will complement the sparse measurements from specialized instruments. Finally, this thesis contains the groundwork for executing retrievals on multidecadal geostationary observations, offering unprecedented spatially and temporally continuous three-dimensional data for the tropics and mid-latitudes. The implementation of these ongoing retrievals is publicly released as part of the Chalmers Cloud Ice Climatology.
machine learning
geostationary satellites
ice clouds
Författare
Adrià Amell Tosas
Chalmers, Rymd-, geo- och miljövetenskap, Geovetenskap och fjärranalys
Ice water path retrievals from Meteosat-9 using quantile regression neural networks
Atmospheric Measurement Techniques,;Vol. 15(2022)p. 5701-5717
Artikel i vetenskaplig tidskrift
A. Amell, and S. Pfreundschuh, and P. Eriksson. The Chalmers Cloud Ice Climatology: retrieval implementation and validation
Robust Estimation of Global precipitation using Neural networks (REGN)
Rymdstyrelsen (154/19), 2020-01-01 -- 2023-12-31.
Ämneskategorier
Matematik
Data- och informationsvetenskap
Geovetenskap och miljövetenskap
Infrastruktur
C3SE (Chalmers Centre for Computational Science and Engineering)
Utgivare
Chalmers
EA, EDIT, Campus Johanneberg, Hörsalsvägen 11
Opponent: Assoc. Prof. Abhay Devasthale and Dr. Nina Håkansson, Swedish Meteorological and Hydrological Institute