Climate-driven sea level anomalies modulate coastal groundwater dynamics and discharge
Gonneea, Meagan E.
Mulligan, Ann E.
Charette, Matthew A.
MetadataShow full item record
To better understand the physical drivers of submarine groundwater discharge (SGD) in the coastal ocean, we conducted a detailed field and modeling study within an unconfined coastal aquifer system. We monitored the hydraulic gradient across the coastal aquifer and movement of the mixing zone over multiple years. At our study site, sea level dominated over groundwater head as the largest contributor to variability in the hydraulic gradient and therefore SGD. Model results indicate the seawater recirculation component of SGD was enhanced during summer while the terrestrial component dominated during winter due to seasonal changes in sea level driven by a combination of long period solar tides, temperature and winds. In one year, sea level remained elevated year round due to a combination of ENSO and NAO climate modes. Hence, predicted changes in regional climate variability driven sea level may impact future rates of SGD and biogeochemical cycling within coastal aquifers.
Author Posting. © American Geophysical Union, 2013. This article is posted here by permission of American Geophysical Union for personal use, not for redistribution. The definitive version was published in Geophysical Research Letters 40 (2013): 2701–2706, doi:10.1002/grl.50192.
Suggested CitationArticle: Gonneea, Meagan E., Mulligan, Ann E., Charette, Matthew A., "Climate-driven sea level anomalies modulate coastal groundwater dynamics and discharge", Geophysical Research Letters 40 (2013): 2701–2706, DOI:10.1002/grl.50192, https://hdl.handle.net/1912/6156
Showing items related by title, author, creator and subject.
The magnitude and origin of groundwater discharge to Eastern U.S. and Gulf of Mexico coastal waters Befus, Kevin Martin; Kroeger, Kevin D.; Smith, Christopher G.; Swarzenski, Peter W. (John Wiley & Sons, 2017-10-28)Fresh groundwater discharge to coastal environments contributes to the physical and chemical conditions of coastal waters, but the role of coastal groundwater at regional to continental scales remains poorly defined due ...
Russoniello, Christopher J.; Konikow, Leonard F.; Kroeger, Kevin D.; Fernandez, Cristina; Andres, A. Scott; Michael, Holly A. (2016-05-02)Submarine groundwater discharge (SGD) is a small portion of the global water budget, but a potentially large contributor to coastal nutrient budgets due to high concentrations relative to stream discharge. A numerical ...
A radiocarbon method and multi-tracer approach to quantifying groundwater discharge to coastal waters Gramling, Carolyn M. (Massachusetts Institute of Technology and Woods Hole Oceanographic Institution, 2003-09)Groundwater discharge into estuaries and the coastal ocean is an important mechanism for the transport of dissolved chemical species to coastal waters. Because many dissolved species are present in groundwater in ...