West Antarctic Warming Faster Than Thought, Study Finds

A paper released Sunday by the journal Nature Geoscience reports that the temperature at a research station in the middle of West Antarctica has warmed by 4.4 degrees Fahrenheit since 1958. That is roughly twice as much as scientists previously thought and three times the overall rate of global warming, making central West Antarctica one of the fastest-warming regions on earth.

“The surprises keep coming,” said Andrew J. Monaghan, a scientist at the National Center for Atmospheric Research in Boulder, Colo., who took part in the study. “When you see this type of warming, I think it’s alarming.”

Of course, warming in Antarctica is a relative concept. West Antarctica remains an exceedingly cold place, with average annual temperatures in the center of the ice sheet that are nearly 50 degrees Fahrenheit below freezing.

But the temperature there does sometimes rise above freezing in the summer, and the new research raises the possibility that it might begin to happen more often, potentially weakening the ice sheet through surface melting. The ice sheet is already under attack at the edges by warmer ocean water, and scientists are on alert for any new threat.

A potential collapse of the West Antarctic ice sheet is one of the long-term hazards that have led experts to worry about global warming. The base of the ice sheet sits below sea level, in a configuration that makes it especially vulnerable. Scientists say a breakup of the ice sheet, over a period that would presumably last at least several hundred years, could raise global sea levels by 10 feet, possibly more.

The new research is an attempt to resolve a scientific controversy that erupted several years ago about exactly how fast West Antarctica is warming. With few automated weather stations and even fewer human observers in the region, scientists have had to use statistical techniques to infer long-term climate trends from sparse data.

A nearby area called the Antarctic Peninsula, which juts north from West Antarctica and for which fairly good records are available, was already known to be warming rapidly. A 2009 paper found extensive warming in the main part of West Antarctica, but those results were challenged by a group that included climate change contrarians.

To try to get to the bottom of the question, David H. Bromwich of Ohio State University pulled together a team that focused on a single temperature record. At a lonely outpost called Byrd Station, in central West Antarctica, people and automated equipment have been keeping track of temperature and other weather variables since the late 1950s.

It is by far the longest weather record in that region, but it had intermittent gaps and other problems that had made many researchers wary of it. The Bromwich group decided to try to salvage the Byrd record.

They retrieved one of the sensors and recalibrated at the University of Wisconsin. They discovered a software error that had introduced mistakes into the record and then used computerized analyses of the atmosphere to fill the gaps.

The reconstruction will most likely undergo intensive scientific scrutiny, which Dr. Bromwich said he would welcome. “We’ve tested everything we could think of,” he said.

Assuming the research holds up, it suggests that the 2009 paper, far from overestimating warming in West Antarctica, had probably underestimated it, especially in summer.

Eric J. Steig, a University of Washington researcher who led the 2009 work, said in an interview that he considered his paper to have been supplanted by the new research. “I think their results are better than ours, and should be adopted as the best estimate,” he said. He noted that the new Byrd record matches a recent temperature reconstruction from a nearby borehole in the ice sheet, adding confidence in the findings.

Much of the warming discovered in the new paper happened in the 1980s, around the same time the planet was beginning to warm briskly. More recently, Dr. Bromwich said, the weather in West Antarctica seems to have become somewhat erratic. In the summer of 2005, the interior of West Antarctica warmed enough for the ice to undergo several days of surface melting.

Dr. Bromwich is worried that this could eventually become routine, perhaps accelerating the decay of the West Antarctic ice sheet, but the warming is not fast enough for that to happen right away. “We’re talking decades into the future, I think,” Dr. Bromwich said.

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No Clear Link Between Cancer and 9/11 Debris, New York Health Dept. Study Finds

The study was by far the largest to date. It examined 55,700 people, including rescue and recovery workers who were present at the World Trade Center site, on barges or at the Staten Island landfill where debris was taken in the nine months after Sept. 11, 2001, as well as residents of Lower Manhattan, students, workers and passers-by exposed on the day of the terrorist attacks.

Over all, there was no increase in the cancer rate of those studied compared with the rate of the general population, researchers concluded after looking at 23 cancers from 2003 to 2008. The prevalence of three cancers — multiple myeloma, prostate and thyroid — was significantly higher, but only in rescue and recovery workers and not in the rest of the exposed population. But since the number of actual cases was small and the subjects of the study may have been screened more frequently for cancer than other people on average, the researchers noted that it was too early to draw any correlation to time spent at ground zero.

In one of many counterintuitive findings, the incidence of cancer was not higher among those who were exposed more intensely to the toxic substances than among those who were exposed less.

The lack of clear evidence of a link between cancer and the debris from Sept. 11 casts into doubt the decision by the federal government in June to add 50 different types of cancer to the list of illnesses covered by the James Zadroga 9/11 Health and Compensation Act, signed by President Obama in early 2011. That decision meant that people with other sicknesses linked more strongly to ground zero were likely to receive less money.

Dr. Thomas A. Farley, the health commissioner in New York City, said in an interview on Monday that it was too soon to take the study as a repudiation of the government’s decision.

“Cancers take 20 years to develop,” Dr. Farley said, “and we might see something different 20 years down the line.” But echoing Dr. John Howard, head of the National Institute for Occupational Safety and Health, who made the final decision on covering cancer, the commissioner added, “You don’t want to wait 20 to 30 years to get a definitive answer” to people suffering today.

On Tuesday, Dr. Howard issued a statement that said, “The W.T.C. Health Program welcomes this addition to the peer-reviewed scientific literature, and we have long encouraged the growth of such peer-reviewed research.”

Dr. Alfred I. Neugut, an oncologist and professor of epidemiology at the Mailman School of Public Health at Columbia University, said he was not surprised by the study. “I think, given the time frame and the exposures,” he said, “that there wasn’t a high likelihood that there would be an elevated risk, certainly for cancer, and to the degree that it was, it would not be for the cancers that they’re finding.”

Dr. Neugut said he sympathized with people who had cancer they attributed to the disaster, but added that their emotional response was not necessarily valid scientifically. “The 9/11 attack was a terrible thing, but it doesn’t cause everything in the world,” he said. “Cancer is a very specific outcome, and in most exposures, you have to be exposed for an extended time before you get the cancer.”

Initially, the money set aside by the law — $2.8 billion to compensate victims and $1.5 billion for monitoring and treatment costs not covered by health insurance — covered mainly respiratory illnesses. (Mental health problems were included in the treatment fund but not the compensation fund.) Studies by the city health department have found asthma and post-traumatic stress disorder to be linked to the 2001 attacks. But cancer is expected to be far more expensive to treat than other qualifying illnesses, and the economic loss caused by cancer could require more compensation, since many cancer patients cannot work, and some have died.

The study was released on Tuesday, and was to be published in the Wednesday issue of The Journal of the American Medical Association — too late to influence Dr. Howard’s decision, but perhaps not too late to influence public opinion going forward or to affect whether Congress will decide to replenish the victim compensation fund should more money be needed.

The fund has not yet begun making payments, and it is supposed to make its final payments in 2016-17. In the meantime, some police officers and other rescue and recovery workers who worked at ground zero and have cancer have been receiving enhanced pension benefits based on a 2005 state law that said they were presumed to have contracted cancer from the ground zero substances.

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