Deglacial water-table decline in Southern California recorded by noble gas isotopes
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Abstract
Constraining the magnitude of past hydrological change may improve understanding and predictions of future shifts in water availability. Here we demonstrate that water-table depth, a sensitive indicator of hydroclimate, can be quantitatively reconstructed using Kr and Xe isotopes in groundwater. We present the first-ever measurements of these dissolved noble gas isotopes in groundwater at high precision (≤0.005‰ amu−1; 1σ), which reveal depth-proportional signals set by gravitational settling in soil air at the time of recharge. Analyses of California groundwater successfully reproduce modern groundwater levels and indicate a 17.9 ± 1.3 m (±1 SE) decline in water-table depth in Southern California during the last deglaciation. This hydroclimatic transition from the wetter glacial period to more arid Holocene accompanies a surface warming of 6.2 ± 0.6 °C (±1 SE). This new hydroclimate proxy builds upon an existing paleo-temperature application of noble gases and may identify regions prone to future hydrological change.
Study Area
| Publication type | Article |
|---|---|
| Publication Subtype | Journal Article |
| Title | Deglacial water-table decline in Southern California recorded by noble gas isotopes |
| Series title | Nature Communications |
| DOI | 10.1038/s41467-019-13693-2 |
| Volume | 10 |
| Year Published | 2019 |
| Language | English |
| Publisher | Nature |
| Contributing office(s) | California Water Science Center |
| Description | 5739, 6 p. |
| Country | United States |
| State | California |
| City | San Diego |
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