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Abstract:

In this study, the performance of the combined-source variational data assimilation scheme (CS-VDA) is assessed in detail using in situ heat fluxes (i.e. sensible heat (H) and latent heat (LE)) collected at a Eucalypt forest savanna of Northern Australia (Howard Springs). The CS VDA scheme estimates surface turbulent heat fluxes via assimilation of sequences of land surface temperature (LST) and meteorological data into a surface energy balance model and a dynamic model. The main objectives of this paper were to extend previous studies to a semi-arid ecosystem and to evaluate the potential of using global meteorological forcing data (GMD) to drive the CS VDA model (rather than in-situ meteorological observations). In order to study the new errors associated with the use of GMD, the effects on LE of the uncertainty in air temperature and wind speed (the two key meteorological factors that controls the total estimation error) was quantitatively characterized. Using hourly in-situ measurements as inputs, the daily-averaged LE RMSE daily was 54 W/m 2 , which agrees with the errors previously reported in the literature. As expected, replacing local meteorological data with GMD reduces the performance of the LE estimation (GMA: RMSE daily = 82 W/m 2 , GLDAS: RMSE daily = 151 W/m 2 ). However, LE RMSE values at 8-day temporal scale for GMA are RMSE 8-days = 32 W/m 2 , similar to those reported in this area for other models (MODIS (MOD16A2) and Breathing Earth System Simulator (BESS)). The error propagation analysis indicate that the CS VDA model is very sensitive to uncertainties in wind speed measurements. Moreover, there are large discrepancies between in situ and GMD wind speed. These two factors combined can explain the degradation in LE estimations. In this context, our study is a first step towards the characterization of an operational daily LE estimation scheme using hourly LST observations. © 2019 Elsevier B.V.

Registro:

Documento: Artículo
Título:Estimation of latent heat flux using satellite land surface temperature and a variational data assimilation scheme over a eucalypt forest savanna in Northern Australia
Autor:Barraza, V.; Grings, F.; Franco, M.; Douna, V.; Entekhabi, D.; Restrepo-Coupe, N.; Huete, A.; Gassmann, M.; Roitberg, E.
Filiación:Instituto de Astronomía y Física del Espacio (IAFE-UBA-CONICET), Cdad. Universitaria, CABA, Buenos Aires, Argentina
Department of Civil and Environmental Engineering, Massachusetts Institute of Technology, Cambridge, MA, United States
School of Life Sciences, University of Technology of Sydney, Sydney, NSW, Australia
Department of Ecology and Evolutionary Biology, University of Arizona, Tucson, AZ 85721, United States
Department of Atmospheric and Ocean Sciences, FCEyN, UBA, CABA, Piso 2, Pabellón 2, Cdad. UniversitariaC1428EGA, Argentina
Palabras clave:Latent heat flux; Remote sensing; Savanna; Variational data assimilation; air temperature; data assimilation; deciduous forest; energy balance; land surface; latent heat flux; remote sensing; savanna; semiarid region; surface temperature; wind velocity; Australia; Howard Springs; Northern Territory
Año:2019
Volumen:268
Página de inicio:341
Página de fin:353
DOI: http://dx.doi.org/10.1016/j.agrformet.2019.01.032
Título revista:Agricultural and Forest Meteorology
Título revista abreviado:Agric. For. Meterol.
ISSN:01681923
CODEN:AFMEE
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_01681923_v268_n_p341_Barraza

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Citas:

---------- APA ----------
Barraza, V., Grings, F., Franco, M., Douna, V., Entekhabi, D., Restrepo-Coupe, N., Huete, A.,..., Roitberg, E. (2019) . Estimation of latent heat flux using satellite land surface temperature and a variational data assimilation scheme over a eucalypt forest savanna in Northern Australia. Agricultural and Forest Meteorology, 268, 341-353.
http://dx.doi.org/10.1016/j.agrformet.2019.01.032
---------- CHICAGO ----------
Barraza, V., Grings, F., Franco, M., Douna, V., Entekhabi, D., Restrepo-Coupe, N., et al. "Estimation of latent heat flux using satellite land surface temperature and a variational data assimilation scheme over a eucalypt forest savanna in Northern Australia" . Agricultural and Forest Meteorology 268 (2019) : 341-353.
http://dx.doi.org/10.1016/j.agrformet.2019.01.032
---------- MLA ----------
Barraza, V., Grings, F., Franco, M., Douna, V., Entekhabi, D., Restrepo-Coupe, N., et al. "Estimation of latent heat flux using satellite land surface temperature and a variational data assimilation scheme over a eucalypt forest savanna in Northern Australia" . Agricultural and Forest Meteorology, vol. 268, 2019, pp. 341-353.
http://dx.doi.org/10.1016/j.agrformet.2019.01.032
---------- VANCOUVER ----------
Barraza, V., Grings, F., Franco, M., Douna, V., Entekhabi, D., Restrepo-Coupe, N., et al. Estimation of latent heat flux using satellite land surface temperature and a variational data assimilation scheme over a eucalypt forest savanna in Northern Australia. Agric. For. Meterol. 2019;268:341-353.
http://dx.doi.org/10.1016/j.agrformet.2019.01.032