Regional scale assessment of Submarine Groundwater Discharge in Ireland combining medium resolution satellite imagery and geochemical tracing techniques

Wilson, J.; Rocha, Carlos

doi:10.1016/j.rse.2011.11.018

Cited by 78 publications

(82 citation statements)

References 47 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Given the above, it might be expected that, episodically, particularly after heavy rainfall, the amount of freshwater in unconfined aquifers would increase producing a pressure gradient that could result in pore fluid displacement and/or freshwater expulsion. Additionally, Wilson and Rocha (2012) identified water temperature anomalies, typically associated with submarine ground water discharge, just 1 km SW from the studied pockmark field. This hypothesis is not, however, supported by the pore fluid data from the collected sediment core, though profiles show some interesting features (Fig.…”

Section: Pockmark Formationmentioning

confidence: 99%

Occurrence, characteristics and formation mechanisms of methane generated micro-pockmarks in Dunmanus Bay, Ireland

Szpak

Monteys

O’Reilly

et al. 2015

Continental Shelf Research

View full text Add to dashboard Cite

a b s t r a c tA small gas pockmark field in Dunmanus Bay, SW Ireland was surveyed and ground-truthed to assess its activity, geomorphology, explore its formation mechanisms and to investigate its potential influence on the benthic community. The field consisted of 121 circular, shallow units ranging from 5 to 17 m in diameter and not exceeding 1 m in relief. Sub-bottom profiles revealed broad acoustic signatures typical of shallow gas accumulation in the subsurface in addition to vertically elongated signals of ascending bubbles captured in the echo sounder data. The pockmarks show strong correlation with the depth of sub-surface gas fronts. However methane concentrations in the water column and directly above the features were close to typical marine, background values and did not exceed 15 nM. This suggests a very mild, periodic venting scenario. Sediment core samples revealed permeable sandy layers with slightly elevated methane concentrations indicative of stratified, diffusive flow. Pore-water sulphate and chloride data show no sign of pore water freshening and thus suggest that methane gas is the sole fluid responsible for formation of these pockmarks. Benthic infauna distributions showed reduced diversity in pockmarked regions, primarily influenced by the sediment composition. Few species utilising chemosymbiotic associations were identified, and there was little indication of a community influenced by methane venting in Dunmanus Bay.

show abstract

Section: Pockmark Formationmentioning

confidence: 99%

Occurrence, characteristics and formation mechanisms of methane generated micro-pockmarks in Dunmanus Bay, Ireland

Szpak

Monteys

O’Reilly

et al. 2015

Continental Shelf Research

View full text Add to dashboard Cite

show abstract

“…Therefore, a total of seven daytime and cloud-free Landsat 7 satellite images (USGS) (i.e., 4 January, 5 February, 13 February, 26 April, 9 September, 11 October and 19 October 2015) was extracted to further examine spatial variations of water surface temperature (30 m × 30 m) in Poyang Lake and assess the hydrodynamic model. The methodology for the retrieval of water surface temperature is provided by Wilson and Rocha [44] and was applied similarly here. In brief, the approach involves the conversion of raw thermal data to at-satellite or top of atmosphere radiance values.…”

Section: Field Data and Remote Sensing Imagesmentioning

confidence: 99%

Investigation of Water Temperature Variations and Sensitivities in a Large Floodplain Lake System (Poyang Lake, China) Using a Hydrodynamic Model

Zhang

et al. 2017

Remote Sensing

View full text Add to dashboard Cite

Abstract:Although changes in water temperature influence the rates of many ecosystem processes in lakes, knowledge of the water temperature regime for large floodplain lake systems subjected to multiple stressors has received little attention. The coupled models can serve to derive more knowledge on the water temperature impact on lake ecosystems. For this purpose, we used a physically-based hydrodynamic model coupled with a transport model to examine the spatial and temporal behavior and primary causal factors of water temperature within the floodplain of Poyang Lake that is representative of shallow and large lakes in China. Model performance is assessed through comparison with field observations and remote sensing data. The daily water temperature variations within Poyang Lake were reproduced reasonably well by the hydrodynamic model, with the root mean square errors of 1.5-1.9 • C. The modeling results indicate that the water temperature exhibits distinct spatial and temporal variability. The mean seasonal water temperatures vary substantially from 29.1 • C in summer to 7.7 • C in winter, with the highest value in August and the lowest value in January. Although the degree of spatial variability differed considerably between seasons, the water temperature generally decreases from the shallow floodplains to the main flow channels of the lake. As expected, the lake water temperature is primarily affected by the air temperature, solar radiation, wind speed and the inflow temperature, whereas other factors such as cloud cover, relative humidity, precipitation, evaporation and lake topography may play a complementary role in influencing temperature. The current work presents a first attempt to use a coupled model approach, which is therefore a useful tool to investigate the water temperature behavior and its major causal factors for a large floodplain lake system. It would have implications for improving the understanding of Poyang Lake water temperature and supporting planning and management of the lake, its water quality and ecosystem functioning.

show abstract

“…In lakes, where the inflow and outflow of all of the other sources of water are measured, and precipitation and evaporation can be calculated, implementing a water budget is possible [4,29]. With the advent of satellite imaging and remote sensing, detecting plumes of groundwater by their temperature difference from surrounding water is a new option [30]. This technique, while efficient at identifying groundwater hot spots, cannot yet be used to calculate discharge [30].…”

Section: Introductionmentioning

confidence: 99%

“…With the advent of satellite imaging and remote sensing, detecting plumes of groundwater by their temperature difference from surrounding water is a new option [30]. This technique, while efficient at identifying groundwater hot spots, cannot yet be used to calculate discharge [30]. Advection-diffusion and heat flow modeling are also utilized to calculate groundwater discharge, but much less often than the most popular method of using tracers [4,10].…”

Section: Introductionmentioning

confidence: 99%

Groundwater Discharge in the Arctic: A Review of Studies and Implications for Biogeochemistry

Lecher

2017

Hydrology

View full text Add to dashboard Cite

Groundwater discharge, including submarine groundwater discharge, discharge to lakes and rivers, and subglacial discharge, affects freshwater and marine ecosystems across the globe. The implications for biogeochemistry include the transport of nutrients, metals, and gases to these systems. The Arctic is one region of the globe that has been understudied with respect to groundwater discharge until recently, when a handful of studies sought to understand the nature of groundwater discharge and its impacts on aquatic ecosystems. Those studies are summarized here, and the implications for biogeochemistry are synthesized. Carbon and nitrogen are the most frequently studied solutes with respect to groundwater discharge in the Arctic. The transport of carbon and nitrogen through groundwater discharge are discussed across study sites, and scientists expect their transport through this mechanism to significantly change with the onset of climate change. The Arctic is of special interest in terms of groundwater discharge, as climate change data predicts that it will warm faster than other environments. Lastly, the effects of climate change on the physical and biogeochemical aspects of groundwater discharge in the Arctic are discussed, as are research priorities.

show abstract

Regional scale assessment of Submarine Groundwater Discharge in Ireland combining medium resolution satellite imagery and geochemical tracing techniques

Cited by 78 publications

References 47 publications

Occurrence, characteristics and formation mechanisms of methane generated micro-pockmarks in Dunmanus Bay, Ireland

Occurrence, characteristics and formation mechanisms of methane generated micro-pockmarks in Dunmanus Bay, Ireland

Investigation of Water Temperature Variations and Sensitivities in a Large Floodplain Lake System (Poyang Lake, China) Using a Hydrodynamic Model

Groundwater Discharge in the Arctic: A Review of Studies and Implications for Biogeochemistry

Contact Info

Product

Resources

About