Cloudy feedback on global warming

Oct. 31, 2016- 
Lawrence Livermore National Laboratory researchers have identified a mechanism that causes low clouds -- and their influence on Earth’s energy balance -- to respond differently to global warming, depending on their spatial pattern and location. The results imply that studies relying solely on recent observed trends underestimated how much Earth will warm due to increased carbon dioxide. The...

Researcher sheds light on ocean observations

Feb. 24, 2016- 
Oceanographer Paul Durack of the Laboratory’s Program for Climate Modeling and Intercomparison (PCMDI) recently opined about the importance of ocean salinity observations and needed urgent attention for the ocean observing system in the journal, Nature Climate Change.The global water cycle — where, when and how it rains, and the corresponding changes to water availability — are as pressing an...

Livermore Lab scientists show salinity matters when it comes to sea level changes

Nov. 20, 2014- 
 LIVERMORE, California -- Using ocean observations and a large suite of climate models, Lawrence Livermore National Laboratory scientists have found that long-term salinity changes have a stronger influence on regional sea level changes than previously thought."By using long-term observed estimates of ocean salinity and temperature changes across the globe, and contrasting these with model...

Volcanoes contribute to recent warming 'hiatus'

Feb. 23, 2014- 
LIVERMORE, Calif. -- Volcanic eruptions in the early part of the 21st century have cooled the planet, according to a study led by Lawrence Livermore National Laboratory. This cooling partly offset the warming produced by greenhouse gases. Despite continuing increases in atmospheric levels of greenhouse gases, and in the total heat content of the ocean, global-mean temperatures at the surface...

Current ice melt rate in Pine Island Glacier may go on for decades

Feb. 21, 2014- 
A study of the Pine Island Glacier could provide insight into the patterns and duration of glacial melt. The Pine Island Glacier, a major outlet of the West Antarctic Ice Sheet, has been undergoing rapid melting and retreating for the past two decades. But new research by an international team including researchers from Lawrence Livermore National Laboratory shows that this same glacier also...

Research shows humans are primary cause of global ocean warming over past 50 years

June 10, 2012- 
LIVERMORE, Calif. -- The oceans have warmed in the past 50 years, but not by natural events alone. New research by a team of Lawrence Livermore National Laboratory scientists and international collaborators shows that the observed ocean warming over the last 50 years is consistent with climate models only if the models include the impacts of observed increases in greenhouse gas during...

Separating signal and noise in climate warming

Nov. 17, 2011- 
LIVERMORE, Calif. -- In order to separate human-caused global warming from the "noise" of purely natural climate fluctuations, temperature records must be at least 17 years long, according to climate scientists. To address criticism of the reliability of thermometer records of surface warming, Lawrence Livermore National Laboratory scientists analyzed satellite measurements of the...