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Title	The Atmospheric Imaging Mission for Northern Regions: AIM-North
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Author	Nassar, R; McLinden, C; Sioris, C E; McElroy, C T; Mendonca, J; Tamminen, J; MacDonald, C G; Adams, C; Boisvenue, C; Bourassa, A; Cooney, R; Degenstein, D; Drolet, G; Garand, L; Girard, R; Johnson, M; Jones, D B A; Kolonjari, F; Kuwahara, B; Martin, R V; Miller, C E; ONeill, N; Riihelä, A; Roche, S; Sander, S P; Simpson, W R; Singh, G; Strong, K; Trishchenko, A P; van, Mierlo, H; Zanjani, Z V; Walker, K A; Wunch, D
Source	Canadian Journal of Remote Sensing vol. 45, 43894, 2019 p. 423-442, https://doi.org/10.1080/07038992.2019.1643707 Open Access
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Year	2019
Alt Series	Natural Resources Canada, Contribution Series 20190612
Document	serial
Lang.	English
Media	paper; on-line; digital
File format	pdf
Subjects	geophysics; remote sensing; evapotranspiration coefficient; vegetation
Program	Canada Centre for Remote Sensing Divsion
Released	2019 09 25
Abstract	Due to complex natural water flux processes and the ambiguous explanation of Bouchet's complementary theory, site-level investigations on evapotranspiration (ET) and related climate variables assist in understanding the regional hydrological response to climate change. In this study, site specific empirical parameters were incorporated in the Bouchet's complementary relationship (CR) and potential and actual ET were estimated by CR method and subsequently validated by 6 years of ground-based vapor flux observations. Time series analysis, correlation analysis and principal regression analysis were conducted to reveal the characteristics of climate change and the controlling factor(s) of the variations of potential ET and actual ET. The results show that this region is exhibiting a combined warming and drying trend over the past decades with two change points that occurred in 1993 and in 2000. Potential ET was predominantly influenced by temperature and vapor pressure deficit, while actual ET was mostly influenced by vegetation activity. Potential ET was found to be increasing concurrently with declining actual ET to constitute nearly a symmetric complementary relationship over the past decades. This study help to enhance our understanding of the regional hydrological response to climate change. Further studies are needed to partition the actual ET into transpiration and other components and to reveal the role of vegetation activity in determining regional ET as well as water balance.
GEOSCAN ID	321941