Geophysical Research Letters News

(Photo: NOC)

Arctic Melt Leads to Enhanced Storms

circulation, which then results in a cooling of the North Atlantic. Our new study shows that freshwater achieves this cooling much more rapidly and efficiently by triggering atmospheric feedbacks,” said NOC's Marilena Oltmanns, lead author of the study published in the Journal of Geophysical Research Letters this week.Freshwater creates shallower surface layers that adjust faster to the lower air temperature in autumn and winter. This increases the north-south temperature gradient, promoting the occurrence of storms. The storms in turn reinforce the cooling by triggering increased ocean heat

Photo Courtesy of National Oceanography Centre

#Oi2020 History

the ice mixes with a relatively warm, salty layer below it. This mixing is caused by turbulent motions, such as internal waves and eddy currents, which are likely to increase as the sea-ice thins and breaks up, causing a positive feedback effect. The study as published in the Journal of Geophysical Research Letters, identified differences in how energy is distributed by turbulent motions in the Arctic when compared to open, ice-free seas. The findings also showed that the turbulence was very similar in Arctic regions with high and low amounts of sea-ice. This suggests that the turbulence in the Arctic

Pic: University College London Photo credit: Alexander Mils on Pexels

Tracking Ship Emissions from Space

and the University of Oxford shows how satellite tracking could be used to monitor compliance with the upcoming IMO 0.5% sulfur emission regulations and Emission Control Areas (ECA).Research conducted by their own researchers, UCL Energy and the University of Oxford and published today in Geophysical Research Letters, has unveiled discoveries that appear important on many levels for they describe the impact of shipping emissions on the climate: because fossil fuel emission particles from ships affect the air including by releasing sulfur, they affect clouds and consequently the environment.Acknowledging

Image: RBR

RBR Order to Support Great Lakes RAEON

; T loggers (internally recording and powered temperature instruments) will be used in conjunction with acoustic telemetry arrays in Lake Ontario for the long-term monitoring of how the temperature in the lake changes over annual and inter-annual time scales.  Based on work published in Geophysical Research Letters, the high accuracy of the RBRsolo³ T temperature measurement is required to measure and resolve the small changes in the vertical structure of lake temperature that drive seasonal circulation and track long-term changes.Over 20 RBRmaestro³ CTD multiparameter data loggers were

Illustration by Natalie Renier, Woods Hole Oceanographic Institution

Currents Not Linked to New England Sea Level

There is no direct link between major North Atlantic ocean currents and sea level along the coast of northeastern United States, according to a recent study by the Woods Hole Oceanographic Institution (WHOI).The study, published last week in the journal Geophysical Research Letters, examined both the strength of the Atlantic Meridional Overturning Circulation (AMOC)—a conveyor belt of currents that move warmer waters north and cooler waters south in the Atlantic—and historical records of sea level in coastal New England.“Scientists had previously noticed that if the AMOC is stronger

One of the CTD instruments used to collect the data used in this study (Photo: NOC)

Switch from Leaded Petrol has Reduced Ocean Pollution

New research shows the first observed reduction in lead concentrations in the surface waters of the seas around Europe since the phasing out of leaded petrol.Lead has no biological function, and is toxic to humans and marine organisms. The study, published in Geophysical Research Letters, is based on samples of the Celtic Sea taken during a series of research expeditions on board the Royal Research Ship (RRS) Discovery. The results show that there has been a four-fold reduction in the concentration of lead in the surface waters of European shelf seas compared to measurements undertaken two to three

Thaw Could Release Toxic Waste Buried Under Greenland's Ice

start to melt by the end of the century on current trends, the scientists added.   "Climate change could remobilise the abandoned hazardous waste believed to be buried forever beneath the Greenland ice sheet," the university said of findings published this week in the journal Geophysical Research Letters.   The study, led by York University in Canada in collaboration with the University of Zurich, estimated that pollutants in the camp included 200,000 litres (44,000 UK gallons) of diesel fuel and the coolant from a nuclear generator used to produce power.   "It's a new

A new study compared sea surface temperatures with endangered Galapagos Penguin population counts and found that the penguin population doubled while waters cooled around their nesting islands. (Courtesy of Snowmanradio/Flickr)

Climate Change Boosts Galapagos Penguin Population

;The penguins are the innocent bystanders experiencing feast or famine depending on what the Equatorial Undercurrent is doing from year to year," said Kristopher Karnauskas, a climate scientist who performed the research while at WHOI, and lead author of the new study recently accepted in Geophysical Research Letters, an American Geophysical Union journal.   The new findings could help inform conservation efforts to save the endangered penguins, said the study’s authors. Increasing efforts on the northern coasts of the islands and expanding marine-protected areas north to where the penguins

Credit: Grolltech

Study: Worldwide Ship Traffic up 300% since 1992

than 300 percent over the 20-year period, according to the research. International trade and the sizes of merchant fleets have both enlarged rapidly over the past two decades, explaining the steep rise in ship traffic, the study reports. The new analysis has been accepted for publication in Geophysical Research Letters, a journal of the American Geophysical Union. Jean Tournadre is a geophysicist at Ifremer, the French Institute for the Exploitation of the Sea in Plouzane, and the study author. The author hope the new study will increase scientists’ understanding of how human activities are affecting

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