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- Title
Evaluation of Downward Surface Longwave Flux Estimates Using Meteosat Cloud Observations.
- Authors
Lopes, Francisco M.; Dutra, Emanuel; Trigo, Isabel F.; Wild, Martin
- Abstract
The downward surface longwave flux (DSLF) plays a relevant role in the Earth's surface radiative budget, which is crucial to monitor, understand and model the impact of changes at local and global scales on surface temperature and surface conditions. This study focuses on the evaluation and intercomparison of four DSLF products: (a) a recently developed all‐weather DSLF product based on the multivariate adaptive regression splines (MARS) algorithm driven by satellite cloud information from the Meteosat Second Generation (MSG) and ERA5 reanalysis screen variables; (b) the Satellite Application Facility on Land Surface Analysis (LSA SAF); (c) CERES Synoptic top‐of‐atmosphere and surface fluxes and clouds (CERES‐SYN1deg) and (d) ERA5 reanalysis. The study covers the period 2005–2021 and the MSG region focusing on monthly means. The evaluation performed against 48 ground stations from the Baseline Surface Radiation Network (BSRN) and FLUXNET2015 networks showed that the MARS product outperforms the remaining products, particularly the LSA SAF, while ERA5 and CERES show similar performance metrics. The fours products are intercompared in terms of their mean spatial variability and temporal mean annual cycles and inter‐annual variability in four selected regions, showing a high level of agreement, particularly between MARS, ERA5 and CERES. Our results highlight the clear added value of MARS with respect to LSA SAF, while providing higher spatial resolution (0.05°), constrained by satellite cloud information, when compared with ERA5 (0.25°) or CERES (1°). Plain Language Summary: Radiation that reaches the Earth's surface is fundamental for our understanding of the Earth's energy balance. In this work, we use a complex mathematical method together with data from weather satellites and ground‐based instruments to estimate the heat radiation component. To evaluate our results, we perform a comparison with those from various existing methods, including the one used by the Portuguese meteorological service. Our method generally outperforms the already existing techniques, with small errors as compared to surface measurements, demonstrating the added value of this new approach in improving our understanding of Earth's energy budget. Key Points: Evaluation of a new high spatial (0.05°) and temporal (30 min) resolution DSLF product constrained by MSG satellite cloud informationThe new DSLF MARS product outperforms the current LSA SAF when evaluated against 48 ground stationsHigh level of spatial and temporal variability consistency between four DSLF products MARS, LSA SAF, ERA5, CERES
- Subjects
MADISON Square Garden Co.; ENERGY budget (Geophysics); SURFACE of the earth; METEOROLOGICAL satellites; HEAT radiation &; absorption; METEOROLOGICAL services; EARTH stations
- Publication
Journal of Geophysical Research. Atmospheres, 2024, Vol 129, Issue 6, p1
- ISSN
2169-897X
- Publication type
Article
- DOI
10.1029/2023JD040306