Monday, December 11, 2017
 
Stratosphere an Accomplice for Santa Ana Winds and California Wildfires

Stratosphere an Accomplice for Santa Ana Winds and California Wildfires

The hot and dry Santa Ana winds are associated with many of Southern California’s destructive wildfires, and even take the blame for tense, ugly moods. Now, NOAA researchers have found that on occasion the winds have an accomplice in contributing to California’s wildfires: atmospheric events known as stratospheric intrusions, which bring extremely dry air from the upper atmosphere down to the surface

The findings suggest that forecast models with the capacity to predict stratospheric intrusions may provide valuable lead time for agencies to issue air quality alerts and fire weather warnings, or to reallocate fire fighting resources before these extreme events occur.

“The atmosphere could give us an early warning for some wildfires,” said Andrew Langford, a research chemist at NOAA’s Earth System Research Laboratory in Boulder, Colorado, and lead author of the study. Researchers at NOAA’s National Environmental Satellite, Data, and Information Service (NESDIS) and the Cooperative Institute for Research in Environmental Sciences (CIRES) at the University of Colorado Boulder coauthored the work, which was published this week in Geophysical Research Letters.

The authors took a detailed look at the May 2013 “Springs Fire” that burned 25,000 acres about 50 miles northwest of Los Angeles. They used a NOAA forecast model that incorporates satellite observations of ozone, wind data, and other atmospheric information to detect the occurrence of the intrusions.

The analysis showed that in the early hours before the Springs Fire, a tongue of air characteristic of the stratosphere—extremely dry and very high in ozone from the stratosphere’s ozone layer—reached to the surface in southern California and extended as far south as Baja California.

Satellite Image of California Fire

Satellite Image of California Fire

Satellite image of smoke on May 2, 2013, the first day of the Springs fire northwest of Los Angeles. The photo was taken by the Moderate Resolution Imaging Spectroradiometer (MODIS) instrument on NASA’s Terra satellite. Photo credit: NASA.
The researchers found that ground-based monitoring stations near the fire’s origin also confirmed the telltale signs of the intrusion right before the fire broke out: a large drop in relative humidity and a rise in ozone. As the day went on, a combination of factors accelerated the fire: low humidity, persistent high winds, dry condition of the grasses and other vegetation, clear skies and bright sunlight, and very warm surface temperatures. A few days later, cloudy skies, a drop in temperature, a shift in winds, and widespread rainfall helped extinguish the fire.

The stratospheric intrusion also had another downside during the Springs Fire. It added ozone from the upper atmosphere to the urban and fire-related pollution produced in the lower atmosphere. On the second and third days of the fire, this helped to push levels of ground level ozone—which can harm people’s lungs and damage crops—over the federal limit at 24 monitoring sites across southern California. Monitors as far away as Las Vegas also saw a spike in ozone on the third day of the fire. The observed exceedances of the ozone standard were unusual for the region for that time period, suggesting that the stratospheric intrusions were a contributing factor.

“Stratospheric intrusions are double trouble for Southern California,” said Langford. “We knew that the intrusions can add to surface ozone pollution. Now we know that they also can contribute to the fire danger, particularly during La Niña years when deep intrusions are more frequent, as recently shown by our NOAA colleagues at the Geophysical Fluid Dynamics Laboratory. The good news is that with models and observations, we can get an early warning from the atmosphere in some cases.”

The authors note that stratospheric intrusions have previously been implicated in the explosive development of wildland fires in New Jersey and Michigan, but have not previously been connected to fires in southern California or to the Santa Ana winds. The frequent occurrence of stratospheric intrusions above the West Coast during the fall, winter, and spring suggests that similar circumstances may have played a role in other major southern California fires, including the series of destructive fires that burned more than 800,000 acres in October of 2003, and burned nearly a million acres in October of 2007, say the authors.

For more information, please contact Monica Allen, director of public affairs for NOAA Oceanic and Atmospheric Research at 301-734-1123 or by email at monica.allen@noaa.gov

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