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9 results for “Seawater Intrusion”
Effect of salt water intrusion on the distribution of invertebrates in a GA tidal freshwater marshes from the GCE Seawater Addition Long-Term Experiment (SALTEx) project.
To characterize the effect of persistent and episodic salt water intrusion on the distribution of common freshwater marsh invertebrates, we monitored the density of adult and juvenile fiddler crabs and snails. Prior to the start of salt water addition treatments, we collected data on the distribution of crabs and snails in all 30 experimental plots (6 replicates of 5 treatments: pressed salt water addition, pulsed salt water addition, fresh water addition, procedural control structure, and control no structure). In each experimental plot, we counted the number of adult and juvenile fiddler crab burrows and snails visible on the marshs surface in a 50cm x 75cm plot (juvenile fiddler crabs were counted in only half of this area) that was positioned in the Northeastern corner of each experimental plot. Initial data was collected in March 2014. A Bentho Torch was used to measure the concentrations of cyanobacteria, diatoms, and green algae on the marsh surface in 2015 and 2016.
Widespread seawater intrusions beneath the grounded ice of Thwaites Glacier, West Antarctica
<p>Warm water from the Southern Ocean has a dominant impact on the evolution of Antarctic glaciers and in turn on their contribution to sea level rise. Using a continuous time series of daily-repeat satellite synthetic-aperture radar interferometry data from the ICEYE constellation collected in March-June 2023, we document an ice grounding zone, or region of tidally-controlled migration of the transition boundary between grounded ice and ice afloat in the ocean, at the main trunk of Thwaites Glacier, West Antarctica, a strong contributor to sea level rise with an ice volume equivalent to a 0.6-m global sea level rise. The ice grounding zone is 6 km wide in the central part of Thwaites with shallow bed slopes, and 2 km wide along its flanks with steep basal slopes. We additionally detect irregular seawater intrusions, 5-10 cm in thickness, extending another 6 km upstream, at high tide, in a bed depression located beyond a bedrock ridge that impedes the glacier retreat. Seawater intrusions align well with regions predicted by the GlaDS subglacial water model to host a high-pressure distributed subglacial hydrology system in between lower-pressure subglacial channels. Pressurized seawater intrusions will induce vigorous melt of grounded ice over kilometers, making the glacier more vulnerable to ocean warming, and increasing the projections of ice mass loss. Kilometer-wide, widespread seawater intrusion beneath grounded ice may be the missing link between the rapid, past, and present changes in ice sheet mass and the slower changes replicated by ice sheet models. The dataset includes grounding line positions, all ICEYE radar interferograms and parameter files, files of tidal predictions and corrections for change in atmospheric pressure, and output products from the GlADS subglacial hydrology model.</p>
Data for: Seawater intrusions in the observed grounding zone of Petermann Glacier causes extensive retreat
<p>Understanding grounding line dynamics is critical for projecting glacier evolution and sea level rise. Recent observations from satellite radar interferometry reveal rapid grounding line migration forced by oceanic tides that are several kilometers larger than predicted by hydrostatic equilibrium alone, indicating that the transition from grounded to floating ice is more complex than previously thought. Recent studies suggest that seawater intrusions beneath grounded ice may play a role in glacier dynamics. Here, we investigate their impact on the evolution of Petermann Glacier, Greenland, using an ice sheet model. We compare the model results with observed changes in grounding line position, velocity, and ice elevation between 2010 and 2022. If we exclude seawater intrusions, the model requires anomalously high melt rates to replicate the retreat. Conversely, we match the observed retreat with 3-km-long seawater intrusions with a maximum ice shelf melt rate of 50~m/yr, consistent with observations. We also obtain more realistic glacier speedup and ice thinning when including seawater intrusions in the model. We conclude that seawater intrusions play a critical role in the dynamics of Petermann Glacier. Including them in glacier flow models will make glaciers more sensitive to ocean warming and increase projections of sea level rise.</p>
Data For: Seawater intrusion at the grounding line of Jakobshavn Isbrae, Greenland, from Terrestrial Radar Interferometry (TRI)
<p>Jakobshavn Isbrae is a major outlet glacier in West Greenland that lost its protective ice shelf in 2002 and has been speeding up and retreating since. We image its grounding line for the first time with a ground portable radar interferometer deployed in 2016 and detect its migration at tidal frequencies. The southern half of the glacier develops a floating section (3 km x 3 km) that migrates in phase with the tide up to a distance of 1.5 km, which is far more than expected from flotation. We attribute the migration to kilometer-scale seawater intrusions, 10-20 cm in height, occurring at high tide. The intrusions reveal that the glacier bed must be 100-600 m deeper than expected on the south side, which illustrates that our knowledge of bed topography remains limited in this sector. We expect seawater intrusions to cause rapid melt of basal ice and play a major role in the glacier evolution. </p>
Data For: Seawater intrusion at the grounding line of Jakobshavn Isbrae, Greenland, from Terrestrial Radar Interferometry (TRI)
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Widespread seawater intrusions beneath the grounded ice of Thwaites Glacier, West Antarctica
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Data for: Seawater intrusions in the observed grounding zone of Petermann Glacier causes extensive retreat
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Data from: Rapid retreat of Berry Glacier, West Antarctica linked to seawater intrusions revealed by radar interferometry
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The dataset for the manuscript entitled "Seawater intrusion inhibits nitrate removal in tidal marsh aquifers"
<p>This is the dataset for the manuscript entitled "Seawater intrusion inhibits nitrate removal in tidal marsh aquifers".</p>
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