Abstract
To elucidate temporal and spatial variations of the atmospheric CO 2 concentration over the North Pacific Ocean, air samples have been collected systematically using 4 container ships for 3 years from 1984 to 1986. The seasonal CO 2 cycle was most enhanced at high latitudes and decreased gradually going southward with a phase delay. North of 30°N, the seasonal amplitude was larger in the western part than in the eastern part; however, to the south the situation was reversed. The southward phase shift of the seasonal CO 2 cycle was much reduced in the eastern part, as compared with that in the western part. In the western part, the annual mean values of the CO 2 concentration in respective years were high at middle latitudes and decreased going southward and northward; those in the eastern part were rather constant at middle and high latitudes, but increased slightly with decreasing latitude. As a result, yearly mean CO 2 concentrations between 50° and 25°N were always higher in the western part than in the eastern part and those at lower latitudes showed the opposite distribution. Differences of the CO 2 concentration between the eastern and western parts depended on season and latitude. DOI: 10.1034/j.1600-0889.1992.t01-2-00001.x
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