Evaluation of Chemical Ozone Loss in the Stratosphere over the Kola Peninsula in the 2002/2003 Winter from Microwave Sounding Data

摘要

From long-term observations of ozone evolution in the stratosphere of the Kola Peninsula in the 2002/2003 winter,the rates of chemical destruction of ozone and its net loss at isentropic levels of 530 K(an altitude of about 22 km)and 465 K(an altitude of about 19 km)are evaluated with consideration for diabatic descent of air masses.These rates were-18.6±3.3 and-14.3+2.9 ppb/day and the net loss of ozone due to its chemical destruction over the period from December 1,2002,to March 5,2003,reached 1.77±0.33 ppm and 1.36±0.29 ppm,respectively.At the lower level,these data are in satisfactory agreement(to within measurement errors)with other measurements that were taken at that time.At a potential-temperature level of 530 K,the ozone loss in the 2002/2003 season evaluated from our data and from similar microwave measurements performed in Kiruna(Sweden)virtually coincides and testifies to the fact that the net loss increases with altitude.These inferences are inconsistent with the results obtained with the Match technique and the method of averaging over a vortex,which indicate that the ozone loss decreases with altitude.However,since polar stratospheric clouds were detected regularly in December and early January at levels up to 600 K or higher,it may be suggested that the ozone loss at these altitudes can be comparable to the values found for isentropic levels of 465 to 475 K.