First measurements of the latitudinal atmospheric O2 and CO2 distributions across the western Pacific
Article first published online: 7 SEP 2005
Copyright 2005 by the American Geophysical Union.
Geophysical Research Letters
Volume 32, Issue 17, September 2005
How to Cite
2005), First measurements of the latitudinal atmospheric O2 and CO2 distributions across the western Pacific, Geophys. Res. Lett., 32, L17805, doi:10.1029/2005GL023311., , , , and (
- Issue published online: 7 SEP 2005
- Article first published online: 7 SEP 2005
- Manuscript Accepted: 5 AUG 2005
- Manuscript Revised: 10 JUN 2005
- Manuscript Received: 22 APR 2005
 We examine the latitudinal distribution of the tracer “atmospheric potential oxygen” APO = O2 + 1.1 × CO2 between 40°S and 50°N using new atmospheric CO2 and O2 measurements from flask samples collected onboard cargo ships between Japan and the United States, and Japan and Australia (or New Zealand) during the period from December 2001 to August 2004. Because APO is unaltered during photosynthesis and respiration by land vegetation, its atmospheric distribution is tightly linked to the air-sea gas exchange of O2 and CO2 and the underlying processes. We find that the seasonal amplitude of APO increases towards high latitudes in both hemispheres and its minimum is located approximately 10-degree north of the equator. The latitudinal distribution of annual mean APO shows a maximum in the tropics, confirming the recent coupled ocean-atmosphere model predictions for this region.