New Study Says Water Vapor Is Global Warming Amplifier

Monday, July 28, 2014

A new study from scientists at the University of Miami Rosenstiel School of Marine and Atmospheric Science and colleagues says rising levels of water vapor in the upper troposphere – a key amplifier of global warming – will intensify climate change impacts over the next decades. The new study is the first to show that increased water vapor concentrations in the atmosphere are a direct result of human activities.

“The study is the first to confirm that human activities have increased water vapor in the upper troposphere,” said Brian Soden, professor of atmospheric sciences at the UM Rosenstiel School and co-author of the study.

To investigate the potential causes of a 30-year moistening trend in the upper troposphere, a region three to seven miles above Earth’s surface, Soden, UM Rosenstiel School researcher Eui-Seok Chung and colleagues measured water vapor in the upper troposphere collected by NOAA satellites and compared them to climate model predictions of water circulation between the ocean and atmosphere to determine whether observed changes in atmospheric water vapor could be explained by natural or man-made causes. Using the set of climate model experiments, the researchers showed that rising water vapor in the upper troposphere cannot be explained by natural forces, such as volcanoes and changes in solar activity, but can be explained by increased greenhouse gases, such as CO2.

Greenhouse gases raise temperatures by trapping the Earth’s radiant heat inside the atmosphere. This warming also increases the accumulation of atmospheric water vapor, the most abundant greenhouse gas. The atmospheric moistening traps additional radiant heat and further increases temperatures.

Climate models predict that as the climate warms from the burning of fossil fuels, the concentrations of water vapor will also increase in response to that warming. This moistening of the atmosphere, in turn, absorbs more heat and further raises the Earth's temperature.

The paper, titled “Upper Tropospheric Moistening in response to Anthropogenic Warming,” was published in the July 28 Early Addition on-line of the journal Proceedings of the National Academy of Sciences (PNAS). The paper’s authors include Chung, Soden, B.J. Sohn of Seoul National University, and Lei Shi of NOAA's National Climatic Data Center in Asheville, N.C.


TWRA Introduces Tackett Creek Unit Of North Cumberland Wildlife Management Area

The TWRA has entered into a lease agreement with Molpus Timberlands Management, LLC to lease 43,000 acres, which is being utilized as the Tackett Creek unit of the North Cumberland Wildlife Management Area. Located in both northeastern Campbell and northwestern Claiborne counties, the property, which has been historically used as a Public Hunting Area, is now in a five-year lease ... (click for more)

Tennessee Highway Patrol Urges Motorists To Watch Out For Deer

The Tennessee Highway Patrol urges motorists to exercise caution on the roadways this time of year due to deer-mating and -hunting season. Last year, two people were killed in traffic crashes involving deer on state roadways.  “The fall season is the most active time of year for deer-related crashes. We want to remind drivers to watch out for deer on or around the roadways, ... (click for more)

Man Shot At Apartments On Tunnel Boulevard Wednesday Afternoon, Then 2 Juveniles Shot At Rec Center On Oakwood Drive With Suspects In Custody

Chattanooga police officers responded to the apartment buildings at 404 Tunnel Blvd. Wednesday at 1:21 p.m., where residents say they heard multiple shots fired.  Witnesses said they saw multiple suspects fleeing the scene on foot behind the complex.  The male victim was taken to a local hospital for life threatening gunshot wounds.  Later Wednesday, ... (click for more)

Several Arrested Outside Erlanger Hospital When Crowd Gathers After Woodlawn Shooting

Several people were arrested Monday night outside Erlanger Hospital after a crowd gathered and clashed with police. The crowd included family and friends of 20-year-old Apprentice Berry, who was shot multiple times and killed earlier Monday night at the Woodlawn Apartments on Wilson Street. Erlanger officials said the group gathered at the emergency room, but were later moved ... (click for more)

Chattanooga Has Lost Its Most Popular Citizen - Luther Masingill - And Response

Chattanooga has lost its most popular citizen – Luther Masingill. Although we are saddened we cherish the memories.  All of us have a Luther story.  Mine is the first time I met Luther.  This was before TV and all of Chattanooga listened to Luther on the radio.  I was 12-years-old.  Some of my buddies and I had gone to the State Theater in downtown ... (click for more)

Roy Exum: The Policeman’s Prayer

Every year, when the Law Enforcement Foundation of Greater Chattanooga holds its annual luncheon, it is one of the most heartening displays of what America really believes, down deep inside. The most prominent and influential leaders in the community – well over 1,000 -- gather to pay tribute and pledge their support to our heroes in blue who are unfaltering in their devotion, service ... (click for more)