气候变化领域集成服务门户(CCPortal): Climate elasticity of evapotranspiration shifts the water balance of Mediterranean climates during multi-year droughts

CCPortal

DOI	10.5194/hess-24-4317-2020
	Climate elasticity of evapotranspiration shifts the water balance of Mediterranean climates during multi-year droughts
	Avanzi F.; Rungee J.; Maurer T.; Bales R.; Ma Q.; Glaser S.; Conklin M.
发表日期	2020
ISSN	1027-5606
起始页码	4317
结束页码	4337
卷号	24 期号:9
英文摘要	Multi-year droughts in Mediterranean climates may shift the water balance, that is, the partitioning rule of precipitation across runoff, evapotranspiration, and subsurface storage. Mechanisms causing these shifts remain largely unknown and are not well represented in hydrologic models. Focusing on measurements from the headwaters of California s Feather River, we found that also in these mixed rain snow Mediterranean basins a lower fraction of precipitation was partitioned to runoff during multi-year droughts compared to non-drought years. This shift in the precipitation runoff relationship was larger in the surfacerunoff-dominated than subsurface-flow-dominated headwaters (39% vs. 18% decline of runoff, respectively, for a representative precipitation amount). The predictive skill of the Precipitation Runoff Modeling System (PRMS) hydrologic model in these basins decreased during droughts, with evapotranspiration (ET) being the only water-balance component besides runoff for which the drop in predictive skill during drought vs. non-drought years was statistically significant. In particular, the model underestimated the response time required by ET to adjust to interannual climate variability, which we define as climate elasticity of ET. Differences between simulated and data-driven estimates of ET were well correlated with accompanying data-driven estimates of changes in sub-surface storage (1S, r D 0:78). This correlation points to shifts in precipitation runoff relationships being evidence of a hysteretic response of the water budget to climate elasticity of ET during and after multi-year droughts. This hysteresis is caused by carryover storage offsetting precipitation deficit during the initial drought period, followed by vegetation mortality when storage is depleted and subsequent post-drought vegetation expansion. Our results point to a general improvement in hydrologic predictions across drought and recovery cycles by including the climate elasticity of ET and better accounting for actual subsurface water storage in not only soil, but also deeper regolith that stores water accessible to roots. This can be done by explicitly parametrizing carryover storage and feedback mechanisms capturing vegetation response to atmospheric demand for moisture. © 2020 EDP Sciences. All rights reserved.
语种	英语
scopus关键词	Budget control; Climatology; Digital storage; Drought; Elasticity; Evapotranspiration; Hysteresis; Rain; Runoff; Vegetation; Water supply; Hydrologic modeling; Hydrologic prediction; Interannual climate variability; Mediterranean basin; Mediterranean climates; Precipitation deficits; Vegetation response; Water balance components; Climate models; climate change; drought; evapotranspiration; headwater; hydrological modeling; Mediterranean environment; runoff; subsurface flow; water budget; water storage; California; Feather River; United States
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/159315
作者单位	Avanzi, F., Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, CA 94720, United States, Cima Research Foundation, Via Armando Magliotto 2, Savona, 17100, Italy; Rungee, J., Sierra Nevada Research Institute, University of California, Merced, CA 95343, United States; Maurer, T., Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, CA 94720, United States; Bales, R., Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, CA 94720, United States, Sierra Nevada Research Institute, University of California, Merced, CA 95343, United States; Ma, Q., Sierra Nevada Research Institute, University of California, Merced, CA 95343, United States, Department of Forestry, Mississippi State University, Mississippi State, MS 39762, United States; Glaser, S., Department of Civil and Environmental Engineering, University of California, Berkeley, Berkeley, CA 94720, United States; Conklin...
推荐引用方式 GB/T 7714	Avanzi F.,Rungee J.,Maurer T.,et al. Climate elasticity of evapotranspiration shifts the water balance of Mediterranean climates during multi-year droughts[J],2020,24(9).
APA	Avanzi F..,Rungee J..,Maurer T..,Bales R..,Ma Q..,...&Conklin M..(2020).Climate elasticity of evapotranspiration shifts the water balance of Mediterranean climates during multi-year droughts.Hydrology and Earth System Sciences,24(9).
MLA	Avanzi F.,et al."Climate elasticity of evapotranspiration shifts the water balance of Mediterranean climates during multi-year droughts".Hydrology and Earth System Sciences 24.9(2020).