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DOI	10.5194/hess-23-515-2019
	Using phase lags to evaluate model biases in simulating the diurnal cycle of evapotranspiration: A case study in Luxembourg
	Renner M.; Brenner C.; Mallick K.; Wizemann H.-D.; Conte L.; Trebs I.; Wei J.; Wulfmeyer V.; Schulz K.; Kleidon A.
发表日期	2019
ISSN	1027-5606
起始页码	515
结束页码	535
卷号	23 期号:1
英文摘要	While modeling approaches of evapotranspiration λE) perform reasonably well when evaluated at daily or monthly timescales, they can show systematic deviations at the sub-daily timescale, which results in potential biases in modeled λE to global climate change. Here we decompose the diurnal variation of heat fluxes and meteorological variables into their direct response to incoming solar radiation (Rsd) and a phase shift to Rsd. We analyze data from an eddy-covariance (EC) station at a temperate grassland site, which experienced a pronounced summer drought. We employ three structurally different modeling approaches of λE, which are used in remote sensing retrievals, and quantify how well these models represent the observed diurnal cycle under clear-sky conditions. We find that energy balance residual approaches, which use the surface-to-air temperature gradient as input, are able to reproduce the reduction of the phase lag from wet to dry conditions. However, approaches which use the vapor pressure deficit (Da) as the driving gradient (Penman-Monteith) show significant deviations from the observed phase lags, which is found to depend on the parameterization of surface conductance to water vapor. This is due to the typically strong phase lag of 2-3h of Da, while the observed phase lag of λE is only on the order of 15min. In contrast, the temperature gradient shows phase differences in agreement with the sensible heat flux and represents the wet-dry difference rather well. We conclude that phase lags contain important information on the different mechanisms of diurnal heat storage and exchange and, thus, allow a process-based insight to improve the representation of land-atmosphere (L-A) interactions in models. © Author(s) 2019.
语种	英语
scopus关键词	Climate change; Digital storage; Evapotranspiration; Heat storage; Remote sensing; Thermal gradients; Different mechanisms; Global climate changes; Meteorological variables; Sensible heat flux; Surface conductance; Systematic deviation; Temperate grasslands; Vapor pressure deficit; Heat flux; air temperature; air-soil interaction; climate change; diurnal variation; drought; energy balance; evapotranspiration; global climate; grassland; remote sensing; sensible heat flux; solar radiation; temperature gradient; vapor pressure; Belgium; Luxembourg [Belgium]
来源期刊	Hydrology and Earth System Sciences
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/159779
作者单位	Renner, M., Max Planck Institute for Biogeochemistry, Jena, 07745, Germany; Brenner, C., Institut für Wasserwirtschaft, Hydrologie und Konstruktiven Wasserbau, Universität für Bodenkultur (BOKU), Vienna, 1190, Austria; Mallick, K., Department of Environmental Research and Innovation, Luxembourg Institute of Science and Technology (LIST), Belvaux, 4422, Luxembourg; Wizemann, H.-D., Institut für Physik und Meteorologie, Universität Hohenheim, Stuttgart, 70599, Germany; Conte, L., Max Planck Institute for Biogeochemistry, Jena, 07745, Germany; Trebs, I., Department of Environmental Research and Innovation, Luxembourg Institute of Science and Technology (LIST), Belvaux, 4422, Luxembourg; Wei, J., Institut für Physik und Meteorologie, Universität Hohenheim, Stuttgart, 70599, Germany; Wulfmeyer, V., Institut für Physik und Meteorologie, Universität Hohenheim, Stuttgart, 70599, Germany; Schulz, K., Institut für Wasserwirtschaft, Hydrologie und Konstruktiven Wasserbau, Universität für Bodenkultur (BOKU), Vienna, ...
推荐引用方式 GB/T 7714	Renner M.,Brenner C.,Mallick K.,et al. Using phase lags to evaluate model biases in simulating the diurnal cycle of evapotranspiration: A case study in Luxembourg[J],2019,23(1).
APA	Renner M..,Brenner C..,Mallick K..,Wizemann H.-D..,Conte L..,...&Kleidon A..(2019).Using phase lags to evaluate model biases in simulating the diurnal cycle of evapotranspiration: A case study in Luxembourg.Hydrology and Earth System Sciences,23(1).
MLA	Renner M.,et al."Using phase lags to evaluate model biases in simulating the diurnal cycle of evapotranspiration: A case study in Luxembourg".Hydrology and Earth System Sciences 23.1(2019).