Posted on May 12, 2015 by Bob Berwyn
Western U.S. counties violating current and proposed ozone air quality standards. Map courtesy Jeremy Nichols/ClimateWest blog.
La Niña weather pattern found to contribute to spikes in western ozone levels
FRISCO — Spring ozone formation in parts of the western U.S. appear to be linked with the hemispheric La Niña weather pattern, when the path of the jet stream forces high altitude ozone down to ground level.
After discovering the link, a team of researchers say their findings may help forecast harmful ozone episodes well in advance, which could have implications for attaining the national ozone standard. Continue reading
Filed under: air quality, climate and weather, Environment, La Niña | Tagged: air pollution, air quality, climate, Environment, La Niña, ozone | 1 Comment »
Posted on December 17, 2013 by Bob Berwyn
Cool U.S. readings the exception in a record-warm month
Planet Earth record-warm in November 2013. Graphic courtesy NASA.
FRISCO — November’s cool temperatures across parts of North America were the exception, as the rest of globe reported all-time record warmth for the month. According to the National Climatic Data Center’s monthly update, the average global temperature was 1.40 degrees Fahrenheit above the 20th century average.
Many regions saw all-time record highs, including southern Russia, northwest Kazakhstan, south India, southern Madagascar, parts of the central and south Indian Ocean, and sections of the Pacific Ocean.
Northern Australia, parts of North America, south west Greenland, and parts of the Southern Ocean near South America were cooler than average, but no regions of the globe were record cold during November. Read the full report here. Continue reading
Filed under: climate and weather, El Niño, global warming, La Niña, seasons, Snow and weather | Tagged: climate, global warming, National Climatic Data Center, National Oceanic and Atmospheric Administration, NOAA, November 2013 global temperatures | Leave a comment »
Posted on November 22, 2013 by Bob Berwyn
NOAA’s winter outlook offers little relief for Arizona, New Mexico
By Bob Berwyn
FRISCO — Drought conditions may persist across the southwestern U.S. this winter and may redevelop across the Southeast, according to the seasonal outlook from NOAA’s Climate Prediction Center.
“Even though we don’t have La Niña, the atmosphere across the Pacific seems to be stuck in a La Niña mode … It’s been quite surprising to us, how persistent the pattern is,” said Mike Halpert, acting director of the Climate Prediction Center.
Parts of the Southwest, especially New Mexico, have been experiencing one of the driest periods on record, and Halpert said there is “decent agreement” in the CPC’s models on the climate signal that has resulted in the persistent trend. Continue reading
Filed under: climate and weather, Drought, El Niño, La Niña | Tagged: climate, Climate Prediction Center, drought, El Nino, ENSO, La Niña, Southwest, winter weather outlook | 2 Comments »
Posted on November 12, 2013 by Bob Berwyn
Simultaneous changes in global precipitation patterns can’t be explained by natural variability
By Summit Voice
FRISCO — Scientists with Lawrence Livermore National Laboratory say unequivocally that greenhouse gases are affecting the distribution and intensity of precipitation around the world.
The new study, published Nov. 11 in the Proceedings of the National Academy of Sciences, shows how emissions of heat-trapping and ozone-depleting gases affect the distribution of precipitation through two mechanisms. Increasing temperatures are expected to make wet regions wetter and dry regions drier (thermodynamic changes); and changes in atmospheric circulation patterns will push storm tracks and subtropical dry zones toward the poles.
“Both these changes are occurring simultaneously in global precipitation and this behavior cannot be explained by natural variability alone,” said LLNL’s lead author Kate Marvel. “External influences such as the increase in greenhouse gases are responsible for the changes.” Continue reading
Filed under: climate and weather, El Niño, extreme weather, global warming, La Niña | Tagged: climate change, Environment, global precipitation, global warming, greenhouse gases | 1 Comment »
Posted on November 1, 2013 by Bob Berwyn
‘We may have underestimated the efficiency of the oceans as a storehouse for heat and energy … ‘
The heat trapped by greenhouse gases isn’t missing — it’s in the ocean. bberwyn photo.
By Summit Voice
FRISCO — There’s more evidence that the world’s ocean are taking up the heat trapped by greenhouse gases at an increasing rate, according to a new study published in Science this week.
After reconstructing Pacific Ocean temperatures from the last 10,000 years, the researchers found that the middle depths have warmed 15 times faster in the last 60 years than they did during apparent natural warming cycles in the previous 10,000 years.
“We’re experimenting by putting all this heat in the ocean without quite knowing how it’s going to come back out and affect climate,” said study coauthor Braddock Linsley, a climate scientist at Columbia University’s Lamont-Doherty Earth Observatory. “It’s not so much the magnitude of the change, but the rate of change.” Continue reading
Filed under: climate and weather, El Niño, Environment, global warming, La Niña | Tagged: global, greenhouse gases, Intergovernmental Panel on Climate Change, oceans, warming | Leave a comment »
Posted on October 23, 2013 by Bob Berwyn
Warmer than average temperatures prevailed across much of the globe in September 2013. Graphic courtesy NCDC.
Southern hemisphere land-surface temps record warm for the month
By Summit Voice
FRISCO — For all the tweeting, squawking and general clamor from global warming deniers, you’d think the Earth was on the brink of a new ice age, but the facts show otherwise.
Once again during September, the average global temperature was near record highs, at 1.15 degrees above the 20th century average — tied with 2003 as the fourth-warmest on record.
Even without the warming effect of El Niño, the average global ocean temperature was .97 degrees above the 20th century average, tying with 2006 as the fourth-warmest on record. For the year, land and sea surface temperatures together are on pace to register as the sixth warmest on record, according to the National Climatic Data Center, which released its monthly climate update a few days late due to the shutdown. Continue reading
Filed under: climate and weather, El Niño, global warming, La Niña, seasons | Tagged: Australia heatwave, climate, global temperature records, global warming, National Climatic Data Center, Southern hemisphere record warmth | 1 Comment »
Posted on October 18, 2013 by Bob Berwyn
Cooler Pacific Ocean temps may drive tornado activity into southern U.S.
A tornado near Lakeview, Texas. Photo courtesy NOAA.
By Summit Voice
FRISCO — After studying more than 56,000 tornados, researchers at the University of Missouri say they’ve found a clear link between Pacific Ocean sea surface temperatures and the patterns of storms that spawn the violent twisters. The findings could help scientists predict the type and location of tornado activity in the U.S.
When surface sea temperatures were warmer than average, the U.S. experienced 20.3 percent more tornadoes that were rated EF-2 to EF-5 on the Enhanced Fuijta (EF) scale. (The EF scale rates the strength of tornados based on the damage they cause. The scale has six category rankings from zero to five.)
“Differences in sea temperatures influence the route of the jet stream as it passes over the Pacific and, eventually, to the United States,” said Laurel McCoy, an atmospheric science graduate student at the MU School of Natural Resources. “Tornado-producing storms usually are triggered by, and will follow, the jet stream. This helps explain why we found a rise in the number of tornadoes and a change in their location when sea temperatures fluctuated.” Continue reading
Filed under: climate and weather, Environment, La Niña | Tagged: climate, extreme weather, National Oceanic and Atmospheric Administration, Pacific Decadal Oscillation, Sea surface temperature, tornadoes | 1 Comment »