Friday, April 5, 2019

Its Raining On The Greenland Ice. In Winter

It's Raining on the Greenland Ice. In the Winter. | Lamont-Doherty Earth Observatory

   Rainy weather is becoming increasingly common over parts of the Greenland ice sheet, triggering sudden melting events that are eating at the ice and priming the surface for more widespread future melting, says a new study. Some parts of the ice sheet are even receiving rain in winter—a phenomenon that will spread as climate continues to warm, say the researchers. The study appears this week in the European scientific journal The Cryosphere.   Greenland has been losing ice in recent decades due to progressive warming. Since about 1990, average temperatures over the ice sheet have increased by as much as 1.8 degrees C (3.2F) in summer, and up to 3 degrees C (5.4F) in winter. The 660,000-square-mile sheet is now believed to be losing about 270 billion tons of ice each year. For much of this time, most of this was thought to come from icebergs calving into the ocean, but recently direct meltwater runoff has come to dominate, accounting for about 70 percent of the loss. Rainy weather, say the study authors, is increasingly becoming the trigger for that runoff.   The researchers combined satellite imagery with on-the-ground weather observations from 1979 to 2012 in order to pinpoint what was triggering melting in specific places. Satellites are used to map melting in real time because their imagery can distinguish snow from liquid water. Automated weather stations spread across the ice offer concurrent data on temperature, wind and precipitation. Combining the two sets of data, the researchers zeroed in on more than 300 events in which they found the initial trigger for melting was weather that brought rain. “That was a surprise to see,” said the study’s lead author, Marilena Oltmanns of Germany’s GEOMAR Centre for Ocean Research. She said that over the study period, melting associated with rain and its subsequent effects doubled during summer, and tripled in winter. Total precipitation over the ice sheet did not change; what did change was the form of precipitation. All told, the researchers estimate that nearly a third of total runoff they observed was initiated by rainfall. http://bit.ly/2U1QzQt

Friday, February 8, 2019

A red screaming alarm bell

A red screaming alarm bell’: NASA confirms last five years were the hottest on record – Alternet.org   

  

"We're no longer talking about a situation where global warming is something in the future. It's here. It's now."

 We're no longer talking about a situation where global warming is something in the future. It's here. It's now." NASA scientists confirmed in a report Wednesday that 2018 was one of the hottest years on record, continuing what the New York Times called “an unmistakable warming trend.” Last year was the fourth-warmest on record since scientists began recording such data 140 years ago, according to NASA’s Goddard Institute for Space Studies (GISS). This finding makes the last five years the five hottest years ever, scientists said, slapping down any question that the planet is growing warmer. “2018 is yet again an extremely warm year on top of a long-term global warming trend,” said GISS director Gavin Schmidt in a statement. “The five warmest years have, in fact, been the last five years,” he told the Times. “We’re no longer talking about a situation where global warming is something in the future. It’s here. It’s now.” Read More