Jennifer Clarke - Academia.edu (original) (raw)

Jennifer Clarke

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Centre National de la Recherche Scientifique / French National Centre for Scientific Research

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Papers by Jennifer Clarke

Research paper thumbnail of Hydrological, biogeochemical and carbonate system data in coastal waters and in glacier drainage systems in Kongsfjorden (Svalbard), during July-August 2016: land stations (drainage)

Freshwater samples and physical parameterswere also collectedin theglacial drainages surrounding ... more Freshwater samples and physical parameterswere also collectedin theglacial drainages surrounding the fjordin 55 sampling points. This included supraglacial streams and proglacial watercourses from the moraines to the coast (0-5 km in length). Temperature and conductivityin freshwaterwere measured with a portable Conductivity-Meter (LF325, WTW). For chemical parameters, a 10 L carboy was submerged in streams until the bubbles were removed. Subsamples were then collected using a silicone tube for the determination of nutrients, DOC, DON, DIC, pH and TA.

Research paper thumbnail of Glacial Drivers of Marine Biogeochemistry Indicate a Future Shift to More Corrosive Conditions in an Arctic Fjord

Journal of Geophysical Research: Biogeosciences, 2020

A detailed survey of a high Arctic glacier fjord (Kongsfjorden, Svalbard) was carried out in summ... more A detailed survey of a high Arctic glacier fjord (Kongsfjorden, Svalbard) was carried out in summer 2016, close to the peak of the meltwater season, in order to identify the effects of glacier runoff on nutrient distributions and the carbonate system. Short‐term weather patterns were found to exert a strong influence on freshwater content within the fjord. Freshwater inputs from glacier runoff and ice meltwater averaged (±SD) low nitrate (1.85 ± 0.47 μM; 0.41 ± 0.99 μM), orthophosphate (0.07 ± 0.27 μM; 0.02 ± 0.03 μM), dissolved organic carbon (27 ± 14 μM in glacier runoff), total alkalinity (708 ± 251 μmol kg−1; 173 ± 121 μmol kg−1), and dissolved inorganic carbon (622 ± 108 μmol kg−1; 41 ± 88 μmol kg−1), as well as a modest silicate concentration (3.71 ± 0.02 μM; 3.16 ± 5.41 μM). pCO2 showed a nonconservative behavior across the estuarine salinity gradient with a pronounced undersaturation in the inner‐fjord, leading to strong CO2 uptake from the atmosphere. The combined effect of...

Research paper thumbnail of Sources and Distribution of Fresh Water Around Cape Farewell in 2014

Journal of Geophysical Research: Oceans, 2019

We investigate the origin of fresh water on the shelves near Cape Farewell (south Greenland) usin... more We investigate the origin of fresh water on the shelves near Cape Farewell (south Greenland) using sections of three hydrographic cruises in May (HUD2014007) and June 2014 (JR302 and Geovide). We partition the fresh water between meteoric water sources and sea ice melt or brine formation using the δ18O of sea water. The sections illustrate the presence of the East Greenland Coastal Current (EGCC) close to shore east of Cape Farewell. West of Cape Farewell, it partially joins the shelf break, with a weaker near‐surface remnant of the EGCC observed on the shelf southwest and west of Cape Farewell. The EGCC traps the freshest waters close to Greenland and carries a brine signature below 50‐m depth. The cruises illustrate a strong increase in meteoric water of the shelf upper layer (by more than a factor 2) between early May and late June, likely to result from East and South Greenland spring melt. There was also a contribution of sea ice melt near the surface but with large variability...

Research paper thumbnail of Seasonality and spatial heterogeneity of the surface ocean carbonate system in the northwest European continental shelf

Progress in Oceanography, 2018

Research paper thumbnail of Review Article: How does glacier discharge affect marine biogeochemistry and primary production in the Arctic?

The Cryosphere Discussions, 2019

Research paper thumbnail of Physical and biogeochemical controls on the variability in surface pH and calcium carbonate saturation states in the Atlantic sectors of the Arctic and Southern Oceans

Deep Sea Research Part II: Topical Studies in Oceanography, 2016

Research paper thumbnail of Characterization of a Time-Domain Dual Lifetime Referencing pCO2 Optode and Deployment as a High-Resolution Underway Sensor across the High Latitude North Atlantic Ocean

Frontiers in Marine Science, 2017

Research paper thumbnail of Hydrological, biogeochemical and carbonate system data in coastal waters and in glacier drainage systems in Kongsfjorden (Svalbard), during July-August 2016: land stations (drainage)

Freshwater samples and physical parameterswere also collectedin theglacial drainages surrounding ... more Freshwater samples and physical parameterswere also collectedin theglacial drainages surrounding the fjordin 55 sampling points. This included supraglacial streams and proglacial watercourses from the moraines to the coast (0-5 km in length). Temperature and conductivityin freshwaterwere measured with a portable Conductivity-Meter (LF325, WTW). For chemical parameters, a 10 L carboy was submerged in streams until the bubbles were removed. Subsamples were then collected using a silicone tube for the determination of nutrients, DOC, DON, DIC, pH and TA.

Research paper thumbnail of Glacial Drivers of Marine Biogeochemistry Indicate a Future Shift to More Corrosive Conditions in an Arctic Fjord

Journal of Geophysical Research: Biogeosciences, 2020

A detailed survey of a high Arctic glacier fjord (Kongsfjorden, Svalbard) was carried out in summ... more A detailed survey of a high Arctic glacier fjord (Kongsfjorden, Svalbard) was carried out in summer 2016, close to the peak of the meltwater season, in order to identify the effects of glacier runoff on nutrient distributions and the carbonate system. Short‐term weather patterns were found to exert a strong influence on freshwater content within the fjord. Freshwater inputs from glacier runoff and ice meltwater averaged (±SD) low nitrate (1.85 ± 0.47 μM; 0.41 ± 0.99 μM), orthophosphate (0.07 ± 0.27 μM; 0.02 ± 0.03 μM), dissolved organic carbon (27 ± 14 μM in glacier runoff), total alkalinity (708 ± 251 μmol kg−1; 173 ± 121 μmol kg−1), and dissolved inorganic carbon (622 ± 108 μmol kg−1; 41 ± 88 μmol kg−1), as well as a modest silicate concentration (3.71 ± 0.02 μM; 3.16 ± 5.41 μM). pCO2 showed a nonconservative behavior across the estuarine salinity gradient with a pronounced undersaturation in the inner‐fjord, leading to strong CO2 uptake from the atmosphere. The combined effect of...

Research paper thumbnail of Sources and Distribution of Fresh Water Around Cape Farewell in 2014

Journal of Geophysical Research: Oceans, 2019

We investigate the origin of fresh water on the shelves near Cape Farewell (south Greenland) usin... more We investigate the origin of fresh water on the shelves near Cape Farewell (south Greenland) using sections of three hydrographic cruises in May (HUD2014007) and June 2014 (JR302 and Geovide). We partition the fresh water between meteoric water sources and sea ice melt or brine formation using the δ18O of sea water. The sections illustrate the presence of the East Greenland Coastal Current (EGCC) close to shore east of Cape Farewell. West of Cape Farewell, it partially joins the shelf break, with a weaker near‐surface remnant of the EGCC observed on the shelf southwest and west of Cape Farewell. The EGCC traps the freshest waters close to Greenland and carries a brine signature below 50‐m depth. The cruises illustrate a strong increase in meteoric water of the shelf upper layer (by more than a factor 2) between early May and late June, likely to result from East and South Greenland spring melt. There was also a contribution of sea ice melt near the surface but with large variability...

Research paper thumbnail of Seasonality and spatial heterogeneity of the surface ocean carbonate system in the northwest European continental shelf

Progress in Oceanography, 2018

Research paper thumbnail of Review Article: How does glacier discharge affect marine biogeochemistry and primary production in the Arctic?

The Cryosphere Discussions, 2019

Research paper thumbnail of Physical and biogeochemical controls on the variability in surface pH and calcium carbonate saturation states in the Atlantic sectors of the Arctic and Southern Oceans

Deep Sea Research Part II: Topical Studies in Oceanography, 2016

Research paper thumbnail of Characterization of a Time-Domain Dual Lifetime Referencing pCO2 Optode and Deployment as a High-Resolution Underway Sensor across the High Latitude North Atlantic Ocean

Frontiers in Marine Science, 2017

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