Informations et ressources scientifiques
sur le développement des zones arides et semi-arides

Accueil du site → Master → Portugal → Evaluation of land surface temperature in atmospheric reanalyses using Earth observations

Universidade de Lisboa (2019)

Evaluation of land surface temperature in atmospheric reanalyses using Earth observations

Johannsen, João Frederico Gonçalves

Titre : Evaluation of land surface temperature in atmospheric reanalyses using Earth observations

Auteur : Johannsen, João Frederico Gonçalves

Université de soutenance : Universidade de Lisboa

Grade : Mestrado, Ciências Geofísicas 2019

Résumé partiel
The surface skin temperature (SKT) is a key variable in surface-atmosphere energy and water exchanges. In the first part of this work, the SKT from two reanalyses (ERA-Interim and ERA5) of the European Centre for Medium-Range Weather Forecasts (ECMWF) is evaluated against satellite-based Land Surface Temperature (LST) retrieved by the Satellite Application Facility on Land Surface Analysis (LSA-SAF), during the 2004-2015 period over the Iberian Peninsula. Offline simulations by the Hydrology Tiled ECMWF Scheme of Surface Exchanges over Land (HTESSEL) model are also assessed. We apply four performance metrics to the daily maximum and minimum SKT : the mean error, standard deviation of the error, temporal correlation and root mean squared error. The results show an underestimation of the daytime SKT and a small overestimation of nighttime SKT in all the products, which is in line with previous studies. In general, ERA5 presents a consistent improvement over ERA-Interim by showing an overall better agreement with the satellite observations. There is also a reasonably high correlation between the misrepresentation of vegetation cover in the HTESSEL model and the daily maximum SKT bias. In the second part of the thesis, we apply changes to some parameters of the HTESSEL model. The parameters’ impact in the simulation of SKT is then assessed by comparing them to the satellite-LST in a confined domain centred in Évora.

Présentation

Version intégrale (3,2 Mb)

Page publiée le 23 mars 2021