Land–air interactions and subsurface heat transport: the role of external forcing and implications for last millennium temperature reconstructions
The energy exchanges at the land-atmosphere interface play a fundamental role in several weather and climatic processes both in the atmosphere and below the land surface. A part of the radiation that reaches the surface is reflected away or dissipated by sensible and latent heat fluxes back to the a...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2021 |
| País: | España |
| Institución: | Universidad Complutense de Madrid (UCM) |
| Repositorio: | Docta Complutense |
| Idioma: | inglés |
| OAI Identifier: | oai:docta.ucm.es:20.500.14352/11789 |
| Acceso en línea: | https://hdl.handle.net/20.500.14352/11789 |
| Access Level: | acceso abierto |
| Palabra clave: | 53(043.2) Physics temperature Física temperaturas Física (Física) Física atmosférica 22 Física 2501 Ciencias de la Atmósfera |
| Sumario: | The energy exchanges at the land-atmosphere interface play a fundamental role in several weather and climatic processes both in the atmosphere and below the land surface. A part of the radiation that reaches the surface is reflected away or dissipated by sensible and latent heat fluxes back to the atmosphere while the ground heat flux balances the excess of incoming energy. This surface energy balance establishes a link between the atmosphere and the ground surface that often translates into a strong coupling between the surface air temperature (SAT) and the ground surface temperature (GST). In turn, the surface temperature stands as the key variable since it aects the amount of heat owing into the soil through thermal conduction, thus controlling the distribution of temperature below thesurface. The coupling between SAT and GST and the conductive heat transport of the surface temperature into the soil stand as the central assumptions for reconstructing the past surface temperature variations from present-day subsurface temperature measurements in a technique known as borehole reconstructions. As with every type of temperature reconstruction method, the borehole technique is subject to uncertainty sources principally due to the inuence of physical processes at the surface that interrupt the SAT{GST coupling assumption over adiversity of temporal scales. Understanding the physical mechanisms behind such processes is crucial to gain con dence in the borehole technique estimates regarding the past SAT variations... |
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