New discoveries on how underwater ridges impact the ocean's circulation system will help improve climate projections.
An underwater ridge can trap the flow of cold, dense water at the bottom of the ocean. Without the ridge, deepwater can flow freely and speed up the ocean circulation pattern, which generally increases the flow of warm surface water.
Warm water on the ocean's surface makes the formation of sea ice difficult. With less ice present to reflect the sun, surface water will absorb more sunlight and continue to warm.
U.S. Geological Survey scientists looked back 3 million years, to the mid-Pliocene warm period, and studied the influence of the North Atlantic Ocean’s Greenland-Scotland Ridge on surface water temperature.
"Sea-surface temperatures in the North Atlantic and Arctic Oceans were much warmer during the mid-Pliocene warm period than they are today, but climate models so far have been unable to fully understand and account for the cause of this large scale of warming," said USGS scientist Marci Robinson. "Our research suggests that a lower height of the Greenland-Scotland Ridge during this geologic age was a contributor to the increase of poleward heat transport."
"This is the first time the impact of a North Atlantic underwater ridge on the ocean circulation system was tested in a mid-Pliocene experiment," said Robinson. "Understanding this process allows for more accurate predictions of factors such as ocean temperature and ice volume changes."
Research was conducted on the mid-Pliocene because it is the most recent interval in the earth’s history in which global temperatures reached and remained at levels similar to those projected for the 21st century by the Intergovernmental Panel on Climate Change. Therefore, it may be one of the closest analogs in helping to understand the earth's current and future conditions.
The article was published in the journal, Palaeogeography, Palaeoclimatology, Palaeoecology, and can be viewed online. Any journalists who are not registered with this journal and cannot view this article can contact us to have a copy emailed to them.
This research contributes to the scientific foundation needed to make sound planning decisions in response to changes in climate and land use. To learn more, visit the Climate and Land Use Change website.
The USGS led this research through the Pliocene Research, Interpretation and Synoptic Mapping group. The primary collaborators in this research are the University of Leeds, University of Bristol and the British Geological Survey. More information about PRISM research is available online.
Wandering greenhouse gas
16.03.2018 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
Unique Insights into the Antarctic Ice Shelf System
14.03.2018 | Alfred-Wegener-Institut, Helmholtz-Zentrum für Polar- und Meeresforschung
For the first time, an interdisciplinary team from the University of Basel has succeeded in integrating artificial organelles into the cells of live zebrafish embryos. This innovative approach using artificial organelles as cellular implants offers new potential in treating a range of diseases, as the authors report in an article published in Nature Communications.
In the cells of higher organisms, organelles such as the nucleus or mitochondria perform a range of complex functions necessary for life. In the networks of...
Animal photoreceptors capture light with photopigments. Researchers from the University of Göttingen have now discovered that these photopigments fulfill an...
On 15 March, the AWI research aeroplane Polar 5 will depart for Greenland. Concentrating on the furthest northeast region of the island, an international team...
The world’s second-largest ice shelf was the destination for a Polarstern expedition that ended in Punta Arenas, Chile on 14th March 2018. Oceanographers from...
At the 2018 ILA Berlin Air Show from April 25–29, the Fraunhofer Institute for Laser Technology ILT is showcasing extreme high-speed Laser Material Deposition (EHLA): A video documents how for metal components that are highly loaded, EHLA has already proved itself as an alternative to hard chrome plating, which is now allowed only under special conditions.
When the EU restricted the use of hexavalent chromium compounds to special applications requiring authorization, the move prompted a rethink in the surface...
19.03.2018 | Event News
16.03.2018 | Event News
13.03.2018 | Event News
19.03.2018 | Physics and Astronomy
19.03.2018 | Materials Sciences
19.03.2018 | Event News