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Carbon monoxide total column amounts in the atmospherehave been measured in the High Northern Hemisphere (30°-90° N,HNH) between January 2002 and December 2003 using infrared spectrometers ofhigh and moderate resolution and the Sun as a light source. They werecompared to ground-level CO mixing ratios and to total column amountsmeasured from space by the Terra/MOPITT instrument. All these data revealincreased CO abundances in 2002-2003 in comparison to the unperturbed2000-2001 period. Maximum anomalies were observed in September 2002 andAugust 2003. Using a simple two-box model, the corresponding annual COemission anomalies (referenced to 2000-2001 period) have been found equal to95Tg in 2002 and 130Tg in 2003, thus close to those for 1996 and 1998. Agood correlation with hot spots detected by a satellite radiometer allowsone to assume strong boreal forest fires, occurred mainly in Russia, as asource of the increased CO burdens

Increased Northern Hemispheric carbon monoxide burden in the troposphere in 2002 and 2003 detected from the ground and from space