Tag Archives: Temperatures

Sea of Slush: Arctic sea ice lows mark a new polar climate regime

By Natalie Thomas and Cassandra Garrison

ARCTIC OCEAN (Reuters) – At the edge of the ice blanketing part of the Arctic Ocean, the ice on Monday looked sickly. Where thick sheets of ice once sat atop the water, now a layer of soft, spongy slush slid and bobbed atop the waves.

From the deck of a research ship under a bright, clear sky, “ice pilot” Paul Ruzycki mused over how quickly the region was changing since he began helping ships spot and navigate between icebergs in 1996.

“Not so long ago, I heard that we had 100 years before the Arctic would be ice free in the summer,” he said. “Then I heard 75 years, 25 years, and just recently I heard 15 years. It’s accelerating.”

As if on cue, scientists on Monday said the vast and ancient ice sheet sitting atop Greenland had sloughed off a 113 square kilometer chunk of ice last month. The section of the Spalte Glacier at the northwest corner of the Arctic island had been cracking for several years before finally breaking free on Aug. 27, clearing the way inland ice loss to the sea, the Geological Survey of Denmark and Greenland reported.

With climate change driving up Arctic temperatures, the once-solid sea ice cover has been shrinking to stark, new lows in recent years. This year’s minimum, still a few days from being declared, is expected to be the second-lowest expanse in four decades of record-keeping. The record low of 3.41 million square kilometers – reached in September 2012 after a late-season cyclonic storm broke up the remaining ice – is not much below what we see today.

“We haven’t gone back at all to anything from 30 to 40 years ago,” said climatologist Julienne Stroeve at the National Snow and Ice Data Center in Boulder, Colorado. And as climate change continues, scientists say the sea ice is unlikely to recover to past levels.

In fact, the long-frozen region is already shifting to an entirely new climate regime, marked by the escalating trends in ice melt, temperature rise and rainfall days, according to new research published Monday in the journal Nature Climate Change.

Those findings, climate scientist Laura Landrum said, were “unnerving.”

All three variables – sea ice, temperatures and rainfall – are now being measured well beyond the range of past observations. That makes the future of the Arctic more of a mystery.

“The new climate can’t be predicted by the previous climate,” Landrum explained. “The year-to-year variability, the change in many of these parameters, is moving outside the bounds of past fluctuations.”

Sea ice coverage minimums, in particular, are now about 31% lower than in the decade after 1979, when satellite observations began. The ice has also lost about two-thirds of its bulk, as much of the thicker ice layer built up over years has long since melted away. The current ice regime actually began about two decades ago, the study found.

This vanishing of sea ice also contributes to the region’s warming, as the icy white expanse is replaced by patches of dark water that absorb solar radiation rather than reflecting it back out of the atmosphere. The process, referred to as Arctic amplification, helps to explain why the Arctic has warmed more than twice as fast as the rest of the world over the last four decades.

The polar north will also likely see more days of rain rather than snow, which would further eat into the ice. For the new research, Landrum and her colleague Marika Holland at the National Center for Atmospheric Research analyzed sea ice, air temperature and precipitation data since 1950 to project climate scenarios up to the end of the century. They used computer simulations in the analysis and assumed the world’s release of greenhouse gas emissions would continue at a high trajectory.

Back in the Arctic Ocean aboard the Greenpeace Ship Arctic Sunrise research ship, biologist Kirsten Thompson of the University of Exeter said the new study was important in underlining “how fast and how profoundly the Arctic is changing.”

For Thompson, that means big change for the region’s wildlife, from polar bears and insects to the whales she focuses on studying. “All their distributions are changing,” Thompson said. “We might find in the Arctic there will be winners and losers,” as new species enter the region and out compete indigenous animals.

“Other species certainly will not be able to survive in the future.”

(Reporting by Natalie Thomas in the Arctic Ocean and Cassandra Garrison in Buenos Aires; Editing by Katy Daigle and Lisa Shumaker)

Crews gain on California wildfire as milder temperatures prevail

FILE PHOTO: A satellite image shows the River fire at the Mendocino Complex wildfire in California, U.S., August 6, 2018. Satellite image ©2018 DigitalGlobe, a Maxar company/Handout via REUTERS

LOS ANGELES (Reuters) – Crews battling the largest wildfire in California history took advantage of milder overnight temperatures to gain considerable ground in containing the blaze on Wednesday, a day after officials it would take until September to snuff it out.

The Mendocino Complex fire, which has scorched an area of northern California almost the size of Los Angeles, was 47 percent contained on Wednesday morning, the California Department of Forestry and Fire Protection (Cal Fire) said. A day earlier, the fire was 34 percent contained.

So far, two firefighters have been injured fighting the blaze, which has consumed more than 300,000 acres. While sprawling, the wildfire was less destructive than last week’s Carr Fire near Redding, destroying 75 homes and forcing the evacuation of more than 23,000 people. The Carr Fire destroyed more than 1,000 structures.

Overnight temperatures for Wednesday and Thursday should drop to a low of 64 degrees (18 Celsius) but highs were forecast to hit 98 degrees (36 Celsius) on Wednesday and 99 (37 Celsius) on Thursday, said National Weather Service meteorology intern Jennifer Guenehner.

Some 4,000 firefighters were working on Wednesday to stop the fire from reaching communities at the southern tip of the Mendocino National Forest, about 100 miles north of San Francisco. The blaze is still threatening more than 10,000 structures, Cal Fire said.

The Mendocino Complex is one of 17 major fires burning in California that have destroyed more than 1,500 structures and displaced tens of thousands of people over the past month.

Cal Fire on Tuesday pushed back the date when it expected to bring the Mendocino fire under full control to Sept. 1, the fourth time the department has revised its timetable as the massive wildfire expanded.

The fire became the largest in California history on Monday, after officials began battling two separate blazes in the Mendocino area as a single event, according to Cal Fire.

Now, having scorched more than 300,000 acres, the blaze has surpassed the Thomas Fire, which burned 281,893 acres in Santa Barbara and Ventura counties in southern California last December, destroying more than 1,000 structures.

 

Climate change is widely blamed for the higher temperatures that have fueled wildfires in California, and further afield like in Portugal, Sweden, and Siberia.

The California fires are on track to be the most destructive in a decade, prompting Democratic Governor Jerry Brown and Republican leaders such as state Senator Ted Gaines to call for thinning forests and controlled burns to reduce fire danger. Environmentalists oppose such preventive burns, saying they kill wildlife.

(Reporting by Brendan O’Brien in Milwaukee; Additional reporting by Barbara Goldberg in New York; Editing by Steve Orlofsky and Bernadette Baum)

Los Angeles ‘turns corner’ on largest wildfire in city history

Water is dropped above homes in Sun Valley during the La Tuna Canyon fire over Burbank, California, U.S., September 2,

LOS ANGELES (Reuters) – A smattering of rain and easing temperatures helped more than 1,000 firefighters battling the largest wildfire in Los Angeles history gain the upper hand on the blaze on Sunday, but officials warned that danger remains.

“We’ve turned the corner, but this is not over,” Los Angeles Mayor Eric Garcetti told reporters. “With winds this strong, anything can happen.”

Shifting winds could cause burning embers to spread the fire once more through the rugged northern edge of Los Angeles, said Garcetti.

The nearly 5,900-acre (2400-hectare) La Tuna Fire, named after the canyon area where it erupted on Friday, has destroyed three homes and damaged one. More than 700 homes were evacuated as the blaze tore through thick brush that has not burned in decades.

Firefighters evaluate houses in a voluntary evacuation zone during the La Tuna Canyon fire in Burbank, California, September 3, 2017. REUTERS/Kyle Grillot

Of the 1,400 people evacuated from their homes, 90 percent had returned by Sunday afternoon and Garcetti said nearly all would be back before the day was over.

The wildfire is the largest in terms of acreage in the city’s history, Garcetti said. It was considered 30 percent contained by late Sunday night, up from 10 percent Sunday morning.

“We do not have this fire contained,” Garcetti said, “but we do have a good sense of, in the next day or two, how we can bring this fire to rest.”

The stretch of the 210 freeway, a major thoroughfare that has been closed for several days, will reopen either Sunday night or Monday morning, Garcetti said.

Los Angeles County, home to 10 million people and vast tracts of undeveloped mountainous land, has suffered much larger wildfires that have burned for weeks.

California Governor Jerry Brown on Sunday declared a state of emergency for Los Angeles County, which will ease the path for state and federal help to fight the fire.

Temperatures in the area have hovered around 100 degrees Fahrenheit (38 degrees Celsius) in recent days. But the mercury was in the low 90s on Sunday, and the temperatures are expected to be moderate and the humidity higher in the coming days, positive signs for containing the fire, said Los Angeles Fire Chief Ralph Terrazas.

Garcetti said four firefighters had suffered dehydration or minor burns.

Flames above houses in Sun Valley during the La Tuna Canyon fire over Burbank, California, U.S., September 2, 2017.

Flames above houses in Sun Valley during the La Tuna Canyon fire over Burbank, California, U.S., September 2, 2017. REUTERS/ Kyle Grillot

More than 400 miles (644 km) to the north, the so-called Ponderosa Fire has burned 4,000 acres, or 1,620 hectares, and destroyed 32 homes in Butte County since it started on Tuesday, prompting evacuation orders to residents of about 500 homes. The blaze was 64 percent contained on Sunday evening, up from 56 percent earlier in the day.

 

(Writing by Gina Cherelus in New York and Bernie Woodall in Fort Lauderdale, Fla.; Editing by Mary Milliken and Clarence Fernandez)

 

Four die from heat in sweltering U.S. Southwest: reports

FILE PHOTO: A sign warns of extreme heat as tourists enter Death Valley National Park in California June 29, 2013. REUTERS/Steve Marcus/File Photo

By Dan Whitcomb

LOS ANGELES (Reuters) – Four people, including a homeless person and two hikers, have died from the record-breaking heat in the U.S. Southwest, media reports said, where triple-digit temperatures have driven residents indoors and canceled airline flights.

The first two fatalities recorded in the three-day heatwave took place on Monday in Santa Clara County, California, south of San Francisco, and included a homeless person found in a car, the San Jose Mercury News reported.

The victims were identified only as a 72-year-old man and an 87-year-old woman.

“It is tragic when someone dies of hyperthermia since in most every case it could have been prevented,” Dr. Michelle Jorden of the Santa Clara County Coroner’s Office told the newspaper.

“Hyperthermia and heat stress happen when a body’s heat-regulation system cannot handle the heat. It can happen to anyone, which is why it is so important to be in a cool location, drink plenty of water and take a cool bath or shower if you are getting too hot,” Jorden said.

The extreme heat, brought on by a high-pressure system parked over the Four Corners region where Colorado, Utah, New Mexico, and Arizona meet, has boosted temperatures well above normal across much of the Southwest.

The bodies of a 57-year-old father and his 21-year-old son from Corpus Christi, Texas, were found earlier this week in the Carlsbad Caverns National Park in New Mexico, where they were hiking, media reported.

New Mexico State Police told an NBC affiliate in New Mexico that the scorching temperatures, which were over 100 degrees Fahrenheit (37.8 degrees Celsius), contributed to the deaths of the men.

The National Weather Service and local authorities issued heat advisories and warnings, urging residents to stay indoors and to drink plenty of water if they were outdoors. Power grid operators encouraged customers to use electricity sparingly to avoid a shutdown or blackout.

The sizzling weather forced the cancellation of more than 20 flights at Phoenix Sky Harbor International Airport and delays at McCarran International Airport in Las Vegas. Aviation experts say the hotter, thinner air saps power from airline engines.

The heat can also create issues for ground crews, where pavement temperatures can reach more than 150 degrees F (66 C), a life-threatening condition if workers are exposed to it too long.

Temperatures reached 127 F (52.8 C) in California’s Death Valley at the peak of the heat wave on Tuesday afternoon but cooler weather was expected across the region by the end of the week.

(Reporting by Dan Whitcomb and Brendan O’Brien; Editing by Leslie Adler and Paul Tait)

New Study Finds that Persian Gulf Could Become Uninhabitable Due to Extreme Climate Change

By the end of the century, major cities along the Persian Gulf could be too hot for human survival.

On Monday a scientific study published in the journal Nature Climate Change warned that climate change could make the summer days in the Persian Gulf area too hot for “human habitability.” It would be so hot that even the healthiest of people would only be able to be outdoors for just a few hours. Cities such as Doha, Abu Dhabi, Dubai, and Mecca are at risk if global warming continues at its current rate, according to the Washington Post.

“The threats to human health may be much more severe than previously thought, and may occur in the current century,” Christoph Schaer, a physicist and climate modeler at the Institute for Atmospheric and Climate Science in Zurich, Switzerland, said in a commentary on the study’s conclusions.

The Washington Post reports that the authors of the study are a pair of scientists from Massachusetts Institute of Technology and Loyola Marymount University. Using high-resolution climate models of the Persian Gulf, they were able to view several different scenarios that could affect the area due to climate change over the coming decades. They focused on “wet-bulb temperature,” a key heat measurement that includes evaporation rates and humidity, averaged over several hours to determine when the Persian Gulf would be uninhabitable to humans. They determined that the high temperatures would be so high that the human body would not be able to sweat to ward off the heat.

The scientists predicted that low-lying regions of the Persian Gulf could see temperatures as high as 113 degrees Fahrenheit while other cities including Kuwait City and Al Ain would see temperatures above 140 degrees Fahrenheit. In the summer months, they predict the temperatures rising to as high as 165-170 degrees Fahrenheit, according to the Washington Post and Fox News.

And while some could stave off the heat with air conditioning, the impoverished areas in the Persian Gulf would see disastrous results.

“People who have resources could use air conditioning and avoid the outdoors during heat waves but, in some corners of that region, there are communities and people who don’t have resources to do that,” Elfatih Eltahir, a co-author of the study, told Fox News. “We pointed to some corners of Yemen along the Red Sea that are not as well off as other parts of the Gulf Region.”