Latitudinal distribution of CO2 and CH4 on the route of the Chinese Arctic R esearch Expedition 2003

During the 2nd Chinese Arctic Research Expedition,20 pair of atmospher ic samples were collected on the cruising route from Shanghai to Arctic Ocean us ing NOAA/ESRL flask sampling unit.Mean concentration of CO2 and CH4 were an alyz ed in different latitude zone from 30°N to 80°N and the distribution character is tics were studied.Mean concentration of CO2 decrease toward high latitude whi ch indicates the uptake effect of CO2 by ocean.Coinciding with the CH4 global dis tribution character,mean CH4 concentration increase from 45°N to the North P ole region.Regional or local air mass may influence the greenhouse gas concentrati ons near seashore in the middle latitude(30°N-45°N).