英语翻译
Thethingaseousenvelopethatsurroundsourplanetisintegraltothemaintenanceoflifeonearth.thecompositionoftheatmosphereispredominatelydeterminedbybiologicalprocessesactinginconcertwithphysicalandchemicalchange.Thoughtheconcentrationsofthemajoratmosphericconstituentsoxygenandnitrogenremainthesame,theconcentrationoftracespecies,whicharekeytomanyatmosphericprocessesarechanging.Itisbecomingapparentthatman'sactivitiesarebeginningtochangethecompositionoftheatmosphereoverarangeofscales,leadingto,forexample,increasedaciddeposition,localandregionalozoneepisodes,stratosphericozonelossandpotentiallyclimatechange.inthispart,wewilllookatthefundamentalchemistryoftheatmospherederivedfromobservationsandtheirrationalization.