Publications

Knipper, KR; Kinoshita, AM; Hogue, TS (2016). Evaluation of a moderate resolution imaging spectroradiometer triangle-based algorithm for evapotranspiration estimates in subalpine regions. JOURNAL OF APPLIED REMOTE SENSING, 10, 16002.

Abstract
The current study evaluates the application of a moderate resolution imaging spectroradiometer (MODIS) triangle-based method to estimate evapotranspiration (ET) in subalpine environments. Topographic corrections and improved soil moisture representation are applied to a previously developed net radiation (R-n) model and triangle algorithm to develop an 8-day average ET product based solely on satellite products. We evaluate modeled R-n and MODIS ET (MOD-ET) against ground-based values at four sites in the Sierra Nevada of northern California and also present a comparison between two monthly distributed ET datasets [operational simplified surface energy balance (SSEBop) and MODIS MOD16]. Modeled daily R-n results indicate a systematic underestimation (between -83 and -110 W/m(2) bias). Consequently, R-n is bias-corrected before calculating MOD-ET. MOD-ET validation shows correlations between 0.15 and 0.45 with errors between 73 and 126 W/m(2). MOD-ET and SSEBop ET report correlations of 0.36 and 0.20, respectively, on average, compared to ground-based monthly ET. MOD16 underestimates monthly totals, with bias values on the range of -14 to -144 W/m(2). Semiarid conditions and scale differences between the MODIS pixel and station contribute to errors with respect to observation. Overall, MOD-ET provides reasonable ET estimates and may better capture temporal dynamics in environments undergoing chronic disturbance. (C) The Authors. Published by SPIE under a Creative Commons Attribution 3.0 Unported License.

DOI:
10.1117/1.JRS.10.016002

ISSN:
1931-3195