[1] The impact of wildfires on surface air composition over central Siberia is investigated based on near-surface carbon monoxide (CO) measurements conducted at Zotino Tall Tower Observatory (ZOTTO), a remote station in the center of Siberia, during 2007 and 2008 warm seasons. Seasonal variations of intensity and spatial distribution of wildfires in south of western and eastern Siberia are found to be important factors contributing a substantial part of synoptic and year-to-year variability of background CO levels in the region. Based on the MODIS area burned product, the estimate of the total yearly CO emitted from wildfires in the regions potentially affecting the measurement site (

Using a torsion pendulum, the peculiarities of low-frequency shear elastic and anelastic properties of the improper ferroelastic crystal K2Ba(NO2)4 have been investigated for various crystallographic oriented samples at a temperature range in the vicinity of the phase transition point (TC = 420 K). The work gives insights into the nature of the internal friction and spontaneous torque arising in the samples at the Curie point.

Abstract. Boreal forest fires are currently recognized as a significant factor in climate change and air quality problems. Although emissions of biomass burning products are widely measured in many regions, there is still lack of information on the composition of wildfire emissions in Siberia, a region known for its severe wildfire activity. Emission ratios (ERs) are important characteristics of wildfire emissions as they may be used to calculate the mass of species emitted into the atmosphere due to combustion of a known mass of biomass fuel. We analyze observations of carbon dioxide (CO 2 ), carbon monoxide (CO), methane (CH 4 ), total nonmethane hydrocarbons (NMHCs), nitrogen oxides NO x (= NO + NO 2 ), particulate matter (PM 3 ), and black carbon (BC) within two forest fire plume transects made by the moving railway observatory during TRanscontinental Observations Into the Chemistry of the Atmosphere (TROICA) expeditions. Slopes in linear regressions of excess levels of the pollutants are used to obtain ER CO / CO 2 = 10-15 %, ER CH 4 / CO = 8-10 %, ER NMHC / CO = 0.11-0.21 % ppmC ppmC −1 , ER NO x / CO = 1.5-3.0 ppb ppm −1 , ER PM 3 / CO = 320-385 ng m −3 µg m −3 −1 , and ER BC / CO = 6.1-6.3 µg m −3 ppm −1 , which fall within the range of uncertainty of the previous estimates, being at the higher edge for ER CH 4 / CO , ER NMHC / CO , and ER PM 3 / CO and at the lower edge for ER NO x / CO . The relative uncertainties comprise 5-15 % of the estimated ER CH 4 / CO , ER NMHC / CO , and ER PM / CO and 10-20 % of ER NO x / CO , ER CO / CO 2 , and ER BC / CO . The uncertainties are lower than in many other similar studies and associated mainly with natural variability of wildfire emissions.

No abstract