Journal
GEOPHYSICAL RESEARCH LETTERS
Volume 49, Issue 7, Pages -Publisher
AMER GEOPHYSICAL UNION
DOI: 10.1029/2021GL096154
Keywords
submarine groundwater discharge; atmospheric forcing; subterranean estuary; coastal aquifer; Little Lagoon
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Funding
- Alabama DOT [RP 930-841R]
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By studying anomalies in coastal aquifer hydraulic head time-series, we found that atmospheric forcing has a greater impact on groundwater exchange and residence time, especially during winter. Winter atmospheric groundwater forcing is associated with winter storm passage, occurring approximately every 7 days. In summer, atmospheric groundwater forcing is limited to weak diurnal atmospheric convection and infrequent tropical cyclone activity.
Here we isolate groundwater responses to atmospheric forcing of surface water levels by relating anomalies in coastal aquifer hydraulic head time-series to weather events. Our results demonstrate that atmospheric forcing has a greater effect on groundwater exchange and extended residence time over astronomical tidal pumping at times. During winter, atmospheric groundwater forcing was associated with winter storm passage and had a recurrence interval of approximately 7 days. During summer, atmospheric groundwater forcing was limited to weak diurnal atmospheric convection and infrequent tropical cyclone activity. Because winter storms and tropical cyclones commonly produce precipitation, atmospheric groundwater forcing can synergize with the timing of meteoric recharge producing periods of intense submarine groundwater discharge.
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