CHARACTERISTICS OF INTRAANNUAL VARIATIONS OF N2O AND CH4 IN THE MIDDLE ATMOSPHERE

Intra-annual variations of the N2O and CH4 mixing ratios from the SAMS instrument on the Nimbus-7 satellite are analyzed using special ampli tude and phase characteristics. Differences of the N2O and CH4 evoluti on in the annual cycle are noted. Essential interhemispheric differenc es are noted in the species intra-annual evolution. Asymmetry of the a nnual cycle is characterized by an interval of increase and an interva l when the H2O and CH4 mixing ratios exceed the local annual mean valu es.