Huge Waves Measured for First Time in Arctic Ocean

By W. Erick Rogers
Tuesday, July 29, 2014
J. Thomson / University of Washington

As the climate warms and sea ice retreats, the North is changing. An ice-covered expanse now has a season of increasingly open water which is predicted to extend across the whole Arctic Ocean before the middle of this century. Storms thus have the potential to create Arctic swell – huge waves that could add a new and unpredictable element to the region.

A University of Washington researcher made the first study of waves in the middle of the Arctic Ocean, and detected house-sized waves during a September 2012 storm. The results were recently published in Geophysical Research Letters.

"As the Arctic is melting, it's a pretty simple prediction that the additional open water should make waves," said lead author Jim Thomson, an oceanographer with the UW Applied Physics Laboratory .

His data show that winds in mid-September 2012 created waves of 5 meters (16 feet) high during the peak of the storm. The research also traces the sources of those big waves: high winds, which have always howled through the Arctic, combined with the new reality of open water in summer.

Arctic ice used to retreat less than 100 miles from the shore. In 2012, it retreated more than 1,000 miles. Wind blowing across an expanse of water for a long time creates whitecaps, then small waves, which then slowly consolidate into big swells that carry huge amounts of energy in a single punch.

The size of the waves increases with the fetch, or travel distance over open water. So more open water means bigger waves. As waves grow bigger they also catch more wind, driving them faster and with more energy.

Shipping and oil companies have been eyeing the opportunity of an ice-free season in the Arctic Ocean. The emergence of big waves in the Arctic could be bad news for operating in newly ice-free Northern waters.

"Almost all of the casualties and losses at sea are because of stormy conditions, and breaking waves are often the culprit," Thomson said.

It also could be a new feedback loop leading to more open water as bigger waves break up the remaining summer ice floes.

"The melting has been going on for decades. What we're talking about with the waves is potentially a new process, a mechanical process, in which the waves can push and pull and crash to break up the ice," Thomson said.

Waves breaking on the shore could also affect the coastlines, where melting permafrost is already making shores more vulnerable to erosion.

The observations were made as part of a bigger project by a sensor anchored to the seafloor and sitting 50 meters (more than 150 feet) below the surface in the middle of the Beaufort Sea, about 350 miles off Alaska's north slope and at the middle of the ice-free summer water. It measured wave height from mid-August until late October 2012.

Satellites can give a rough estimate of wave heights, but they don't give precise numbers for storm events. They also don't do well for the sloppy, partially ice-covered waters that are common in the Arctic in summer.

Warming temperatures and bigger waves could act together on summer ice floes, Thomson said: "At this point, we don't really know relative importance of these processes in future scenarios."

Establishing that relationship could help to predict what will happen to the sea ice in the future and help forecast how long the ice-free channel will remain open each year.

The recent paper recorded waves at just one place. This summer Thomson is part of an international group led by the UW that is putting dozens of sensors in the Arctic Ocean to better understand the physics of the sea-ice retreat.

"There are several competing theories for what happens when the waves approach and get in to the ice," Thomson said. "A big part of what we're doing with this program is evaluating those models."

He will be out on Alaska's northern coast from late July until mid-August deploying sensors to track waves. He hopes to learn how wave heights are affected by the weather, ice conditions and amount of open water.

"It's going to be a quantum leap in terms of the number of observations, the level of detail and the level of precision" for measuring Arctic Ocean waves, Thomson said.

The other author is W. Erick Rogers at the Naval Research Laboratory. The research was funded by the U.S. Office of Naval Research.

 

Maritime Reporter November 2014 Digital Edition
FREE Maritime Reporter Subscription
Latest Maritime News    rss feeds

Environmental

Italian Shipbuilder Pleads Guilty to Environmental Crimes

An Italian shipping firm based in Genoa, Italy, pleaded guilty to violating the Act to Prevent Pollution from Ships by falsifying required ships’ documents to hide

K Line to Expand Use of Eco-efficiency Software

Three further K Line vessels to install ClassNK-NAPA GREEN eco-efficiency software after reporting fuel savings during trials on an 8,600 TEU container vessel   NAPA

LR Supports Chinese Recycling Yards' EU Application

LR’s initial verification of the Ship Recycling Facility Plans for both Zhoushan Changhong International Ship Recycling Co. Ltd. and Jiangyin Xiagang Changjiang

News

BP Faces Heavy Hit from Former Prized Asset Rosneft

BP faces a first and heavy loss from its stake in Russia's Rosneft due to plummeting oil prices and a crumbling rouble, potentially forcing it to write down the value of its once-prized asset.

Libyan State Oil Firm NOC Will Remain Independent

Libya's Tripoli-based state firm National Oil Corp (NOC) will remain independent, it said on Thursday, in an apparent attempt to reassure foreign oil buyers it will stay out of the country's conflict.

Oil Prices Retreat from Short-covering Rebound

Global crude prices fell more than $1 a barrel on Thursday, retreating from a short-covering charged rally as traders bet the market had not shaken off a six-month long rout on oversupply concerns.

Marine Science

NKCS Approves FROSIO Inspector Programs

ClassNK Consulting Service Co., Ltd. has announced the agreement concerning the Certifying Body of FROSIO, as an internationally recognized coating inspector’s qualification.

Vard Wins Farstad's OSCV Contract

Vard Holdings Limited (“VARD”) has secured a contract for the design and construction of one Offshore Subsea Construction Vessel (“OSCV”) for Farstad Shipping (“Farstad”).

Coast Guard Foundation Chosen Charity on Celebrity Apprentice

The Coast Guard Foundation, a non-profit organization committed to the education and welfare of Coast Guard members and their families, announced today that this season,

Arctic Operations

BSEE Attends Arctic Council Meeting

The Bureau of Safety and Environmental Enforcement’s (BSEE) David M. Moore recently traveled to Seattle, Wash., for a meeting of the Arctic Council Emergency Prevention,

RV Sikuliaq: Modern Electric Propulsion & Power Management

While ships have used electricity to help power vessels for a long time, new and sophisticated diesel-electric technologies are making serious gains in efficiency,

BigRoll Orders Two MC Class Vessels

BigRoll Shipping announced that COSCO Dalian Shipyard Co. Ltd has been contracted to build two more MC Class Module Carriers, bringing the total number of vessels under construction to four.

 
 
Maritime Security Naval Architecture Navigation Pod Propulsion Port Authority Ship Repair Ship Simulators Shipbuilding / Vessel Construction Sonar Winch
rss | archive | history | articles | privacy | terms and conditions | contributors | top maritime news | about us | copyright | maritime magazines
maritime security news | shipbuilding news | maritime industry | shipping news | maritime reporting | workboats news | ship design | maritime business

Time taken: 0.1493 sec (7 req/sec)