Spring floods carry 40 to more than 80% of the annual amounts of river water, suspended sediment and dissolved solids from Alaska to the coastal Beaufort Sea.
In this study, river water and suspended sediment were collected from the Sagavanirktok and Kuparuk rivers during the spring Floods of 2001, 2002, 2004 and 2006. Concentrations of dissolved Cu, Fe, Pb and some other trace metals, along with DOC, generally increased by 3-to-25-fold within 3 to 7 days of onset of the melt water event due to thawing of ponds and upper soil layers.
These peak concentrations then decreased over the next several days. Only minor shifts in concentrations of major ions were observed during the two to three week flood period. Interannual variations in flow patterns and peak concentrations of dissolved trace elements and suspended sediments were influenced by total flow and cooling and refreezing of flood water during any given year The transfer and fate of riverine inputs in the ocean was influenced by river volume and the presence of 2m thick ice in the coastal Beaufort Sea during spring. River flow was traced up to 15km offshore in 0.5 to 2m thick layers under the ice.
Water from the two rivers and from sea ice has geochemical characteristics that are different from ambient seawater as well as from each other that facilitated tracking of under-ice mixing. Conservative and some non-conservative mixing were observed for selected constituents across the freshwater-seawater interface; however, shifting concentrations of some dissolved substances in river water during the flood period complicated the tracking process.
Observed variations in river composition, flow and mixing with coastal seawater during this multi-year study provide insights to possible future responses to environmental change in the arctic.
Karen Rhine | EurekAlert!
Multi-year submarine-canyon study challenges textbook theories about turbidity currents
12.12.2017 | Monterey Bay Aquarium Research Institute
How do megacities impact coastal seas? Searching for evidence in Chinese marginal seas
11.12.2017 | Leibniz-Institut für Ostseeforschung Warnemünde
MPQ scientists achieve long storage times for photonic quantum bits which break the lower bound for direct teleportation in a global quantum network.
Concerning the development of quantum memories for the realization of global quantum networks, scientists of the Quantum Dynamics Division led by Professor...
Researchers have developed a water cloaking concept based on electromagnetic forces that could eliminate an object's wake, greatly reducing its drag while...
Tiny pores at a cell's entryway act as miniature bouncers, letting in some electrically charged atoms--ions--but blocking others. Operating as exquisitely sensitive filters, these "ion channels" play a critical role in biological functions such as muscle contraction and the firing of brain cells.
To rapidly transport the right ions through the cell membrane, the tiny channels rely on a complex interplay between the ions and surrounding molecules,...
The miniaturization of the current technology of storage media is hindered by fundamental limits of quantum mechanics. A new approach consists in using so-called spin-crossover molecules as the smallest possible storage unit. Similar to normal hard drives, these special molecules can save information via their magnetic state. A research team from Kiel University has now managed to successfully place a new class of spin-crossover molecules onto a surface and to improve the molecule’s storage capacity. The storage density of conventional hard drives could therefore theoretically be increased by more than one hundred fold. The study has been published in the scientific journal Nano Letters.
Over the past few years, the building blocks of storage media have gotten ever smaller. But further miniaturization of the current technology is hindered by...
With innovative experiments, researchers at the Helmholtz-Zentrums Geesthacht and the Technical University Hamburg unravel why tiny metallic structures are extremely strong
Light-weight and simultaneously strong – porous metallic nanomaterials promise interesting applications as, for instance, for future aeroplanes with enhanced...
11.12.2017 | Event News
08.12.2017 | Event News
07.12.2017 | Event News
13.12.2017 | Health and Medicine
13.12.2017 | Physics and Astronomy
13.12.2017 | Life Sciences