Friday, September 25, 2020

Hundreds of whales wash ashore in Tasmania, leaving scientists puzzled

By Mark Puleo, AccuWeather staff writer                       Courtesy of Author, AccuWeather, and AP
Published Sep. 24, 2020 3:43 PM                                                                   Educational Purposes

The deaths of nearly 400 pilot whales on the shore of Tasmania’s west coast has captured global attention, both for the rescue efforts from local agencies and for the puzzling cause behind such a tragic event.

Images captured by helicopters paint the stunning scene, as the bodies of the hundreds of massive sea creatures lay in the shallow waters of the Macquarie Harbor.

Whale carcasses are scattered along the water's edge near Strahan, Australia, Wednesday, Sept. 23, 2020. Authorities revised up the number of pilot whales rescued from Australia's worst-ever mass stranding from 50 to 70 on Thursday, Sept. 24, 2020, as the focus shifted to removing 380 carcasses from Tasmania state shallows. (Patrick Gee/Pool Photo via AP)

According to authorities, 70 beached whales were rescued by locals and staff members from the Tasmania Parks and Wildlife Service. Marine and Conservation Program wildlife biologist Dr. Kris Carlyon said the stranding was the largest in Tasmania history, according to Storyful.

“Globally, there has been some much bigger events than this, twice the size and over, for example, in New Zealand. In Tasmania, this is the biggest we have recorded,” Dr. Carlyon said in a statement from the Department of Primary Industries, Parks, Water and Environment. “There is little we can do to prevent this occurring in the future.”

While the exact reason for why beachings occur is uncertain, experts have a variety of theories. Some have speculated that the whales' navigation and false echoes can bring them into shallow waters, as Carlyon said the "misadventure" of a couple whales could lead many others astray.

Another theory that has been researched from years involves weather patterns that could throw off the marine animals' navigational abilities. But those weather patterns aren't Earth-bound, like a hurricane or a change in the winds, but rather possibly millions of miles away on the surface of the sun.

In this Sept. 22, 2020, file photo, members of a rescue crew stand with a whale on a sand bar near Strahan, Australia. More pilot whales were found stranded on an Australian coast Wednesday, Sept. 23, raising the total to almost 500 in the largest mass stranding ever recorded in the island state of Tasmania. (Brodie Weeding/Pool Photo via AP, File)

In recent years, researchers from NASA provided several theories on why space weather conditions may result in healthy whales, dolphins and porpoises, collectively known as cetaceans, washing ashore.

“Theories as to the cause include magnetic anomalies and meteorological events, such as extreme tides during a new moon and coastal storms, which are thought to disorient the animals,” said Antti Pulkkinen, a NASA heliophysicist who co-authored a study on the topic. “It has been speculated that due to the possible magnetic-field sensing used by these animals to navigate, magnetic anomalies could be at least partially responsible."

AccuWeather Meteorologist and astronomy blogger Brian Lada said there has been a recent uptick in solar activity, which peaked on Sept. 21, the same day the whales beached.

"The sun has been showing some signs of life in recent weeks as it transitions from a period of low activity, called the solar minimum, to a period of high activity, called the solar maximum," Lada said. "This was far from what would be observed during a major solar storm, and it is unclear if it is related to the beached whales, but given the timing, it can’t be completely ruled out as a factor in the whales' behaviors."

According to Lada, one way scientists track solar activity is with X-rays. An instrument on NOAA’s GOES-16 weather satellite is equipped with a sensor to track X-ray emissions from the sun. The solar cycle lasts 11 years, with sunspot activity waxing and waning over that cycle.

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