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Indian Institute of Science (2009)

Surface Energy Budget Over A Land Surface In The Tropics

Arunchandra, S C

Titre : Surface Energy Budget Over A Land Surface In The Tropics

Auteur : Arunchandra, S C

Etablissement : Indian Institute of Science

Grade : Master Science 2009

Résumé partiel
Atmospheric convection is sensitive to the nature of the surface and its temperature. Both dry (without cloud) and moist (with cloud) convections depend on the surface temperature. Surface temperature is of critical importance in several practical applications like human comfort and crop cultivation. In the climate change scenario too, variations in the surface temperature take the center stage. Therefore, prediction of surface temperature is important. The evolution of the temperature is governed by the energy equation and the surface temperature by the surface energy balance. Important components of the surface energy balance are radiation (incoming solar radiation, reflected solar radiation, incoming and outgoing longwave radiation), sensible and latent heat fluxes and heat flux into the ground (called ground heat flux). A large number of individual and collective observations have been carried out in the past to understand the atmospheric boundary layer and the surface energy budgets. However a major share of the observations is from mid-latitudes. There have been few experiments carried out in India, for example, MONTBLEX, LASPEX, etc. One common drawback among these experiments is that the data time series is discontinuous and continuous measurements covering an entire season are lacking. Moreover these measurements were not comprehensive and hence did not allowed to calculate complete surface energy balance – in some cases radiation data is not available while in some humidity data. Therefore, continuous time series of sufficient duration and covering all variables needed to look at the seasonal energy balance based on measurements alone is missing in the Indian context. New programmes with the main objective of predicting convection are being planned in India.

Mots clé : Earth’s Surface Temperature Radiation Latent Heat Flux Soil Heat Flux Eddy Correlation Method (ECM) Surface Energy Fluxes Bulk Method (BM) Soil Temperature Sensor Surface Layer


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