干旱区生态环境知识资源中心(Arid): Groundwater influence on soil moisture memory and land-atmosphere fluxes in the Iberian Peninsula

Arid

DOI	10.5194/hess-23-4909-2019
	Groundwater influence on soil moisture memory and land-atmosphere fluxes in the Iberian Peninsula
	Martinez-de la Torre, Alberto 1,2; Miguez-Macho, Gonzalo 1
通讯作者	Martinez-de la Torre, Alberto
来源期刊	HYDROLOGY AND EARTH SYSTEM SCIENCES
ISSN	1027-5606
EISSN	1607-7938
出版年	2019
卷号	23 期号:12 页码:4909-4932
英文摘要	Groundwater plays an important role in the terrestrial water cycle, interacting with the land surface via vertical fluxes through the water table and distributing water resources spatially via gravity-driven lateral transport. It is therefore essential to have a correct representation of groundwater processes in land surface models, as land-atmosphere coupling is a key factor in climate research. Here we use the LEAFHYDRO land surface and groundwater model to study the groundwater influence on soil moisture distribution and memory, and evapotranspiration (ET) fluxes in the Iberian Peninsula over a 10-year period. We validate our results with time series of observed water table depth from 623 stations covering different regions of the Iberian Peninsula, showing that the model produces a realistic water table, shallower in valleys and deeper under hilltops. We find patterns of shallow water table and strong groundwater-land surface coupling over extended interior semi-arid regions and river valleys. We show a strong seasonal and interannual persistence of the water table, which induces bimodal memory in the soil moisture fields; soil moisture remembers past wet conditions, buffering drought effects, and also past dry conditions, causing a delay in drought recovery. The effects on land-atmosphere fluxes are found to be significant: on average over the region, ET is 17.4% higher when compared with a baseline simulation with LEAFHYDRO's groundwater scheme deactivated. The maximum ET increase occurs in summer (34.9 %; 0.54 mm d(-1)). The ET enhancement is larger over the drier southern basins, where ET is water limited (e.g. the Guadalquivir basin and the Mediterranean Segura basin), than in the northern Mino/Minho basin, where ET is more energy limited than water limited. In terms of river flow, we show how dry season baseflow is sustained by groundwater originating from accumulated recharge during the wet season, improving significantly on a free-drain approach, where baseflow comes from water draining through the top soil, resulting in rivers drying out in summer. Convective precipitation enhancement through local moisture recycling over the semi-arid interior regions and summer cooling are potential implications of these groundwater effects on climate over the Iberian Peninsula. Fully coupled land surface and climate model simulations are needed to elucidate this question.
类型	Article
语种	英语
国家	Spain ; England
开放获取类型	Green Submitted, gold, Green Published
收录类别	SCI-E
WOS记录号	WOS:000500953400001
WOS关键词	WATER-TABLE ; EVAPOTRANSPIRATION ; SURFACE ; MODEL ; IRRIGATION ; FLOW ; SIMULATION ; FEEDBACKS ; ALGORITHM ; DYNAMICS
WOS类目	Geosciences, Multidisciplinary ; Water Resources
WOS研究方向	Geology ; Water Resources
EI主题词	2019-12-02
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/311476
作者单位	1.Univ Santiago de Compostela, Fac Phys, Nonlinear Phys Grp, Santiago De Compostela, Spain; 2.Ctr Ecol & Hydrol, Wallingford, Oxon, England
推荐引用方式 GB/T 7714	Martinez-de la Torre, Alberto,Miguez-Macho, Gonzalo. Groundwater influence on soil moisture memory and land-atmosphere fluxes in the Iberian Peninsula[J],2019,23(12):4909-4932.
APA	Martinez-de la Torre, Alberto,&Miguez-Macho, Gonzalo.(2019).Groundwater influence on soil moisture memory and land-atmosphere fluxes in the Iberian Peninsula.HYDROLOGY AND EARTH SYSTEM SCIENCES,23(12),4909-4932.
MLA	Martinez-de la Torre, Alberto,et al."Groundwater influence on soil moisture memory and land-atmosphere fluxes in the Iberian Peninsula".HYDROLOGY AND EARTH SYSTEM SCIENCES 23.12(2019):4909-4932.