More on Wildfires

Previous posts have highlighted the huge amounts of carbon dioxide, methane and soot being emitted as a result of wildfires. Apart from this, there are further important pollutants to consider in regard to their potential to contribute to warming, especially at high latitudes.

The image below, dated August 7, 2013, and kindly supplied by Leonid Yurganov, shows high levels of carbon monoxide as a result of wildfires in Siberia, reaching high up into the Arctic all the way to Greenland. 

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Formation of tropospheric ozone mostly occurs when nitrogen oxides (NOx), carbon monoxide (CO) and volatile organic compounds (VOCs) react in the atmosphere in the presence of sunlight. NOx, CO, and VOCs are therefore called ozone precursors. Apart from a health hazard, tropospheric ozone is an important greenhouse gas. Furthermore, carbon monoxide emissions contribute to hydroxyl depletion, thus extending the lifetime of methane.

While there appears to be little or no carbon dioxide from wildfires over North America on the above August 7 image, there are many recent wildfires raging over the North American continent, as illustrated by the August 12 map below, from Wunderground. 

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This point is illustrated even better on the image below [added later, ed.] showing a composite image with carbon monoxide over July 3-13, 2013. Carbon monoxide resulting from wildfires in Canada is seen crossing the Atlantic Ocean, due to the Coriolis effect, as well as reaching Greenland in large amounts.

[ click on image to enlarge ]

Related

- Wildfires even more damaging
http://arctic-news.blogspot.com/2013/07/wildfires-even-more-damaging.html

- The Threat of Wildfires in the North
http://arctic-news.blogspot.com/2013/06/the-threat-of-wildfires-in-the-north.html

- Wildfires in Canada affect the Arctic
http://arctic-news.blogspot.com/2013/07/wildfires-in-canada-affect-the-arctic.html

Russia: 74 million acres burned through August 2012

NASA image, acquired September 11, 2012

From NASA Earth Observatory
http://earthobservatory.nasa.gov/IOTD/view.php?id=79161

The summer of 2012 has proven to be the most severe wildfire season Russia has faced in a decade. Unlike 2010, when severe fires raged in western Russia, most of the fires in 2012 have burned through taiga in remote parts of eastern and central Siberia.

On September 11, 2012, the Moderate Resolution Imaging Spectroradiometer (MODIS) on NASA’s Aqua satellite captured this image of fires burning in Tomsk, a region of south central Siberia where severe wildfires have burned throughout the summer. Thick smoke billowed from numerous wildfires near the Ob River and mixed with haze and clouds that arrived from the southwest. Red outlines indicate hot spots where MODIS detected the unusually warm surface temperatures associated with fires.

More than 17,000 wildfires had burned more than 30 million hectares (74 million acres) through August 2012, according to researchers at the Sukachev Institute of Forest in the Russian Academy of Sciences. In comparison, 20 million hectares burned last year, which was roughly the average between 2000 and 2008, according to an analysis of MODIS data published in 2010.

Another way to gauge the severity of a wildfire season is to consider the smoke emissions. Fires emit a range of gases and particles into the atmosphere that can be detected by ground-based, aircraft, and satellite instruments. The two most common emissions are carbon dioxide and water vapor; however, incomplete combustion also generates carbon monoxide, an odorless and poisonous gas. In fact, fires are the source of about half of all carbon monoxide in the atmosphere.

Though ground and aircraft sensors provide the most accurate measurements of carbon monoxide for a localized area, satellites offer the best way to monitor wildfire emissions over broad regions, particularly in remote areas where there are fewer ground-based instruments. Christine Wiedinmyer, a scientist at the National Center for Atmospheric Research, has developed a model that ingests MODIS observations of fires and combines them with other information about vegetation (such as the percentage of tree cover and the type of forest) to calculate the quantity of emissions.

In September 2012, Wiedinmyer used her model to calculate Russian fire emissions for every year dating back to 2002. She found that the amount of carbon monoxide produced in 2012 was significantly more than what was produced in 2010 and the second most in a decade. Through August 31, the model showed that Russian wildfires had released an estimated 48 teragrams of carbon monoxide since the beginning of 2012. By comparison, the model estimated fires yielded just 22 teragrams of carbon monoxide in all of 2010.

Only one year—2003—had higher overall emissions. In that year, when severe fires burned in eastern Russia, wildfires produced an estimated 72 teragrams of carbon monoxide.

References
- Wiedinmyer, C. (2011). The Fire Inventory from NCAR (FINN): a High Resolution Global Model to Estimate the Emissions from Open Burning. Geoscience Model Development.
- Vivhar, A. (2010, July 13). Wildfires in Russia in 2008-2008: Estimates of Burn Areas Using Satellite MODIS MCD45. Remote Sensing Letters.
- Langmann, B. (2009, July 13). Vegetation Fire Emissions and Their Impact on Air Pollution and Climate. Atmospheric Environment.

Further Reading
- Russian Government. (2012, August 6). Dmitry Medvedev on a Working Visit to the Tomsk Region Holds a Meeting on the Situation in the Constituent Entities of the Russian Federation Suffering from Abnormally High Temperatures in 2012.Accessed September 12, 2012.
- Russian Government. (2012, August 6). Dmitry Medvedev Holds a Meeting With Tomsk Region Governor Sergei Zhvachkin. Accessed September 12, 2012.
- Ranson, J. (2012, July). Siberia 2012: A Slow and Smoky Arrival. Notes from the Field.

NASA image courtesy Jeff Schmaltz, LANCE MODIS Rapid Response Team, Goddard Space Flight Center. Caption by Adam Voiland, with information from Christine Wiedinmyer, Jon Ranson, and Vyacheslav Kharuk. Instrument: Aqua - MODIS