The pronounced seasonality of global groundwater recharge

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dc.contributor.authorJasechko, Scott
dc.contributor.authorBirks, S. Jean
dc.contributor.authorGleeson, Tom
dc.contributor.authorWada, Yoshihide
dc.contributor.authorFawcett, Peter J.
dc.contributor.authorSharp, Zachary D.
dc.contributor.authorMcDonnell, Jeffrey J.
dc.contributor.authorWelker, Jeffrey M.
dc.date.accessioned2017-07-12T22:05:15Z
dc.date.available2017-07-12T22:05:15Z
dc.date.copyright2014en_US
dc.date.issued2014
dc.description.abstractGroundwater recharged by meteoric water supports human life by providing two billion people with drinking water and by supplying 40% of cropland irrigation. While annual groundwater recharge rates are reported in many studies, fewer studies have explicitly quantified intra-annual (i.e., seasonal) differences in groundwater recharge. Understanding seasonal differences in the fraction of precipitation that recharges aquifers is important for predicting annual recharge groundwater rates under changing seasonal precipitation and evapotranspiration regimes in a warming climate, for accurately interpreting isotopic proxies in paleoclimate records, and for understanding linkages between ecosystem productivity and groundwater recharge. Here we determine seasonal differences in the groundwater recharge ratio, defined here as the ratio of groundwater recharge to precipitation, at 54 globally distributed locations on the basis of 18O/16O and 2H/1H ratios in precipitation and groundwater. Our analysis shows that arid and temperate climates have wintertime groundwater recharge ratios that are consistently higher than summertime groundwater recharge ratios, while tropical groundwater recharge ratios are at a maximum during the wet season. The isotope-based recharge ratio seasonality is consistent with monthly outputs from a global hydrological model (PCR-GLOBWB) for most, but not all locations. The pronounced seasonality in groundwater recharge ratios shown in this study signifies that, from the point of view of predicting future groundwater recharge rates, a unit change in winter (temperate and arid regions) or wet season (tropics) precipitation will result in a greater change to the annual groundwater recharge rate than the same unit change to summer or dry season precipitation.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.identifier.citationJasechko, Scott et al. (2014). The pronounced seasonality of global groundwater recharge, Water Resources Research, 50, 8845-8867. doi:10.1002/2014WR015809en_US
dc.identifier.urihttp://dx.doi.org/10.1002/2014WR015809
dc.identifier.urihttp://hdl.handle.net/1828/8330
dc.language.isoenen_US
dc.publisherWater Resources Researchen_US
dc.titleThe pronounced seasonality of global groundwater rechargeen_US
dc.typeArticleen_US

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