Performance evaluation of satellite-based approaches for the estimation of daily air temperature and reference evapotranspiration

Shwetha, HR and Kumar, Nagesh D (2018) Performance evaluation of satellite-based approaches for the estimation of daily air temperature and reference evapotranspiration. In: HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES, 63 (9). pp. 1347-1367.

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Abstract

Different satellite-based radiation (Makkink) and temperature (Hargreaves-Samani, Penman-Monteith temperature, PMT) reference evapotranspiration (ETo) models were compared with the FAO56-PM method over the Cauvery basin, India. Maximum air temperature (T-max) required in the ETo models was estimated using the temperature-vegetation index (TVX) and an advanced statistical approach (ASA), and evaluated with observed T-max obtained from automatic weather stations. Minimum air temperature (T-min) was estimated using ASA. Land surface temperature was employed in the ETo models in place of air temperature (T-a) to check the potency of its applicability. The results suggest that the PMT model with T-a as input performed better than the other ETo models, with correlation coefficient (r), averaged root mean square error (RMSE) and mean bias error (MBE) of 0.77, 0.80 mm d(-1) and -0.69 for all land cover classes. The ASA yielded better T-max and T-min values (r and RMSE of 0.87 and 2.17 degrees C, and 0.87 and 2.27 degrees C, respectively).

Item Type:	Journal Article
Publication:	HYDROLOGICAL SCIENCES JOURNAL-JOURNAL DES SCIENCES HYDROLOGIQUES
Publisher:	TAYLOR & FRANCIS LTD
Additional Information:	Copyright for this article belongs to Taylor & Francis
Keywords:	reference evapotranspiration; air temperature; Penman-Monteith temperature; Cauvery basin; India
Department/Centre:	Division of Mechanical Sciences > Centre for Earth Sciences Division of Mechanical Sciences > Civil Engineering
Date Deposited:	28 Dec 2018 12:13
Last Modified:	28 Dec 2018 12:13
URI:	http://eprints.iisc.ac.in/id/eprint/61322

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