Volcanic eruptions have periodically cooled the tropics over at least the last 450 years by spewing out particles that girdle the world at high altitude and reflect sunlight, a study released yesterday said.
The research adds a chunk of regional evidence to earlier work that found major eruptions — such as Krakatoa, Indonesia in 1883 and Huaynaputina, Peru in 1600 — contribute to cooling on a worldwide scale.
A trio of scientists led by Rosanne D’Arrigo of the Lamont-Doherty Earth Observatory in Palisades, New York, looked at ocean temperatures in a belt extending from 30 degrees south across the equator to 30 degrees north.
They compiled temperature records reaching back nearly half a millennium from three sources: ice cores, tree rings and coral reefs.
They found the longest sustained period of cooling of sea surfaces — to a depth of 1m — occurred in the early 1800s following the eruption of Mount Tambora on the Indonesia island of Sumbawa.
Tambora blew its top in 1815 and was the most powerful eruption in recorded history, the US Geological Survey said. But links between volcanic activity and cooler ocean surfaces weakened in the 20th century, apparently as a result of global warming from the burning of fossil fuels, the researchers said.
Another study, also published online in the journal Nature Geoscience, points to a previously unrecognized potential driver of climate change.
Intensive, chemical-laden agriculture could trigger the release of carbon dioxide from river systems, Henry Wilson and Marguerite Xenopoulos of Trent University in Ontario, Canada argue.
The researchers examined organic matter that had dissolved in 34 rivers in Ontario.
Some of the rivers were pristine and others were heavily polluted by runoff from agricultural chemicals such as fertilizers. Pollution from these chemicals meant the organic material was likelier to release its carbon into the atmosphere, the study said.
When Shanghai-based designer Guo Qingshan posted a vacation photo on Valentine’s Day and captioned it “Puppy Mountain,” it became a sensation in China and even created a tourist destination. Guo had gone on a hike while visiting his hometown of Yichang in central China’s Hubei Province late last month. When reviewing the photographs, he saw something he had not noticed before: A mountain shaped like a dog’s head rested on the ground next to the Yangtze River, its snout perched at the water’s edge. “It was so magical and cute. I was so excited and happy when I discovered it,” Guo said.
Chinese authorities said they began live-fire exercises in the Gulf of Tonkin on Monday, only days after Vietnam announced a new line marking what it considers its territory in the body of water between the nations. The Chinese Maritime Safety Administration said the exercises would be focused on the Beibu Gulf area, closer to the Chinese side of the Gulf of Tonkin, and would run until tomorrow evening. It gave no further details, but the drills follow an announcement last week by Vietnam establishing a baseline used to calculate the width of its territorial waters in the Gulf of Tonkin. State-run Vietnam News
TURNAROUND: The Liberal Party had trailed the Conservatives by a wide margin, but that was before Trump threatened to make Canada the US’ 51st state Canada’s ruling Liberals, who a few weeks ago looked certain to lose an election this year, are mounting a major comeback amid the threat of US tariffs and are tied with their rival Conservatives, according to three new polls. An Ipsos survey released late on Tuesday showed that the left-leaning Liberals have 38 percent public support and the official opposition center-right Conservatives have 36 percent. The Liberals have overturned a 26-point deficit in six weeks, and run advertisements comparing the Conservative leader to Trump. The Conservative strategy had long been to attack unpopular Canadian Prime Minister Justin Trudeau, but last month he
Four decades after they were forced apart, US-raised Adamary Garcia and her birth mother on Saturday fell into each other’s arms at the airport in Santiago, Chile. Without speaking, they embraced tearfully: A rare reunification for one the thousands of Chileans taken from their mothers as babies and given up for adoption abroad. “The worst is over,” Edita Bizama, 64, said as she beheld her daughter for the first time since her birth 41 years ago. Garcia had flown to Santiago with four other women born in Chile and adopted in the US. Reports have estimated there were 20,000 such cases from 1950 to
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