rel="nofollow" href="https://doi.org/10.1029/2005GL025305">https://doi.org/10.1029/2005GL025305214 Walker, A.E., & Goodison, B.E. (1993). Discrimination of a wet snow cover using passive microwave satellite data. Annals of Glaciology, 17, 307–311.
215 Wang, L., & Qu, J.J. (2009). Satellite remote sensing applications for surface soil moisture monitoring: A review. Frontiers of Earth Science in China, 3(2), 237–247. https://doi.org/10.1007/s11707‐009‐0023‐7
216 Wang, S., Mo, X., Hu, S., Liu, S., & Liu, Z. (2018). Assessment of droughts and wheat yield loss on the North China Plain with an aggregate drought index (ADI) approach. Ecological Indicators, 87, 107–116. https://doi.org/10.1016/j.ecolind.2017.12.047
217 Wang, X.Y., Wang, J., Jiang, Z.Y., Li, H.Y., & Hao, X.H. (2015). An effective method for snow‐cover mapping of dense coniferous forests in the Upper Heihe River Basin using Landsat Operational Land Imager Data. Remote Sensing, 7(12), 17246–17257. https://doi.org/10.3390/rs71215882
218 Waseem, M., Ajmal, M., & Kim, T. (2015). Development of a new composite drought index for multivariate drought assessment. Journal of Hydrology, 527, 30–37. https://doi.org/10.1016/j.jhydrol.2015.04.044
219 Watkins, M.M., Wiese, D.N., Yuan, D., Boening, C., & Landerer, F.W. (2015). Improved methods for observing Earth’s time variable mass distribution with GRACE using spherical cap mascons. Journal of Geophysical Research: Solid Earth, 120(4), 2648–2671.
220 Whitcraft, A.K., Becker‐Reshef, I., & Justice, C.O. (2015). A framework for defining spatially explicit earth observation requirements for a global agricultural monitoring initiative (GEOGLAM). Remote Sensing, 7(2), 1461–1481.
221 Wilhite, D.A., & Buchanan‐Smith, M. (2005). Drought as hazard: understanding the natural and social context. In D.A. Wilhite (Ed.), Drought and water crises: Science, technology, and management issues (pp. 3–29). Boca Raton, FL: CRC Press.
222 Wilhite, D.A., & Glantz, M.H. (1985). Understanding: the drought phenomenon: the role of definitions. Water international, 10(3), 111–120.
223 Williams, A.P., Seager, R., Abatzoglou, J.T., Cook, B.I., Smerdon, J.E., & Cook, E.R. (2015). Contribution of anthropogenic warming to California drought during 2012–2014. Geophysical Research Letters, 42(16), 6819–6828.
224 WMO, 1975. Drought and agriculture (WMO Technical Note 138). Geneva: World Meteorological Organization.
225 WMO, 2006. Systematic observation requirements for satellite‐based products for climate: Supplemental details to the satellite‐based component of the implementation plan for the global observing system for climate in support of the UNFCCC (WMO/TD‐ No. 1338; GCOS‐ No. 107). Geneva: World meteorological Organization.
226 WMO, 2009. Inter‐regional workshop on indices and early warning systems for drought (8–11 December). Lincoln, Nebraska: World Meteorological Organization.
227 Wolff, D.B., & Fisher, B.L. (2008). Comparisons of instantaneous TRMM ground validation and satellite rain‐rate estimates at different spatial scales. Journal of Applied Meteorology and Climatology, 47(8), 2215–2237.
228 Xie, P., & Arkin, P.A. (1997). Global precipitation: A 17‐year monthly analysis based on gauge observations, satellite estimates, and numerical model outputs. Bulletin of the American Meteorological Society, 78(11), 2539–2558.
229 Xu, H., Bailey, J.O., Barrett, E.C., & Kelly, R.E.J. (1993). Monitoring snow area and depth with integration of remote sensing and GIS. International Journal of Remote Sensing, 14(17), 3259–3268.
230 Xu, R., Tian, F., Yang, L., Hu, H., Lu, H., & Hou, A. (2017). Ground validation of GPM IMERG and TRMM 3B42V7 rainfall products over southern Tibetan Plateau based on a high‐density rain gauge network. Journal of Geophysical Research: Atmospheres, 122(2), 910–924.
231 Yang, Y., & Shang, S. (2013). A hybrid dual‐source scheme and trapezoid framework‐based evapotranspiration model (HTEM) using satellite images: Algorithm and model test. Journal of Geophysical Research: Atmospheres, 118(5), 2284–2300.
232 Yao, Y., Liang, S., Qin, Q., & Wang, K. (2010). Monitoring drought over the conterminous United States using MODIS and NCEP Reanalysis‐2 data. Journal of Applied Meteorology and Climatology, 49(8), 1665–1680.
233 Zacharias, S., Bogena, H., Samaniego, L., Mauder, M., Fuß, R., Pütz, T., et al. (2011). A network of terrestrial environmental observatories in Germany. Vadose Zone Journal, 10(3), 955–973.
234 Zaitchik, B.F., Rodell, M., & Reichle, R.H. (2008). Assimilation of GRACE terrestrial water storage data into a land surface model: Results for the Mississippi River basin. Journal of Hydrometeorology, 9(3), 535–548.
235 Zampieri, M., D’Andrea, F., Vautard, R., Ciais, P., de Noblet‐Ducoudré, N., & Yiou, P. (2009). Hot European summers and the role of soil moisture in the propagation of Mediterranean drought. Journal of Climate, 22(18), 4747–4758.
236 Zamuda, C., Mignone, B., Bilello, D., Hallett, K. C., Lee, C., Macknick, J., et al. (2013). US energy sector vulnerabilities to climate change and extreme weather. Washington, DC: U.S. Department of Energy.
237 Zhang, A., & Jia, G. (2013). Monitoring meteorological drought in semiarid regions using multi‐sensor microwave remote sensing data. Remote Sensing of Environment, 134, 12–23. https://doi.org/10.1016/j.rse.2013.02.023
238 Zhang, X., Chen, N., Li, J., Chen, Z., & Niyogi, D. (2017). Multi‐sensor integrated framework and index for agricultural drought monitoring. Remote Sensing of Environment, 188, 141–163. https://doi.org/10.1016/j.rse.2016.10.045
239 Zreda, M., Shuttleworth, W.J., Zeng, X., Zweck, C., Desilets, D., Franz, T., & Rosolem, R. (2012). COSMOS: The cosmic‐ray soil moisture observing system. Hydrology and Earth System Sciences, 16(11), 4079–4099.
2 Remote Sensing of Evapotranspiration for Global Drought Monitoring
Xiwu Zhan1, Li Fang1,2, Jifu Yin1,2, Mitchell Schull1,2, Jicheng Liu1,2, Christopher Hain3, Martha Anderson4, William Kustas4, and Satya Kalluri5
1 NOAA NESDIS Center for Satellite Applications and Research, College Park, Maryland, USA
2 UMD‐CISESS Cooperative Institute for Satellite Earth System Studies, College Park, Maryland, USA
3 NASA Marshall Space Flight Center, Huntsville, Alabama, USA
4 Agricultural Research Service, United States Department of Agriculture, Beltsville, Maryland, USA
5 Raytheon, Upper Marlboro, Maryland, USA
ABSTRACT
Evapotranspiration (ET) is one of the
