{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,3,24]],"date-time":"2026-03-24T10:57:10Z","timestamp":1774349830713,"version":"3.50.1"},"reference-count":29,"publisher":"American Geophysical Union (AGU)","issue":"D7","license":[{"start":{"date-parts":[[2012,9,21]],"date-time":"2012-09-21T00:00:00Z","timestamp":1348185600000},"content-version":"vor","delay-in-days":9590,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["J. Geophys. Res."],"published-print":{"date-parts":[[1986,6,20]]},"abstract":"<jats:p>An extensive set of atmospheric CO<jats:sub>2<\/jats:sub> observations were obtained during the First Global Geophysical Experiment (FGGE) Hawaii to Tahiti Shuttle expedition of 1979\u20131980. These data have been examined using a one\u2010dimensional meridional diffusive transport model of the atmospheric circulation. The observed CO<jats:sub>2<\/jats:sub> concentration field was first decomposed into three parts: a seasonal component consisting of two harmonic functions of time, with periods of 1 year and 6 months; a mean annual north\u2010south concentration profile; and a linear trend with time, independent of latitude. In the first of two papers interpreting these data, we consider which features of the north\u2010south eddy transport are revealed by the seasonal component of the CO<jats:sub>2<\/jats:sub> concentration field. We assume that the FGGE data represent a zonally and vertically uniform CO<jats:sub>2<\/jats:sub> field, and we restrict our analysis to the latitude belt between 14.5\u00b0N and 14.5\u00b0S, where seasonal sources and sinks of CO<jats:sub>2<\/jats:sub> have minimal influence on the atmospheric CO<jats:sub>2<\/jats:sub> concentration. The strongest feature of the CO<jats:sub>2<\/jats:sub> data for calibrating the model is the steadily diminishing amplitude of the annual harmonic from north to south. We show that in the absence of sources and sinks the magnitude of the eddy diffusion coefficient as a function of latitude can be prescribed from this amplitude, provided that two additional quantities are specified at a single reference location. These additional quantities are the amplitude of the first harmonic of the seasonal flux and the phase difference between that harmonic and the first harmonic of the local concentration signal. Selecting 14.5\u00b0S for this reference location, we find through comparisons of the model prediction with the FGGE CO<jats:sub>2<\/jats:sub> data that the diffusion coefficient depends primarily on the selected amplitude of the seasonal flux and is practically independent of the phase difference. On the basis of the goodness of fit of the model predictions to the CO<jats:sub>2<\/jats:sub> data, we set a lower limit on this flux amplitude, corresponding to an average eddy diffusion coefficient of 4.6 \u00d7 10<jats:sup>9<\/jats:sup> cm<jats:sup>2<\/jats:sup> s<jats:sup>\u22121<\/jats:sup>. This is equivalent to an upper limit of 1.4 years on the interhemispheric exchange time for CO<jats:sub>2<\/jats:sub>. We are unable to set an upper limit on the diffusion coefficient because the phasing of the first harmonic in the FGGE data shifts so slightly with latitude that even very large diffusion coefficients yield satisfactory model predictions of the seasonal CO<jats:sub>2<\/jats:sub> concentration field. The relative variation in the diffusion coefficient with latitude, which is derived solely from the amplitude of the first harmonic of the CO<jats:sub>2<\/jats:sub> data, reveals two zones of resistance to interhemispheric CO<jats:sub>2<\/jats:sub> exchange. One, near 8\u00b0N, corresponds to the well\u2010known intertropical convergence zone of the wind field which exists around the entire earth. The second, near 8\u00b0S, correlates with a weaker wind convergence zone in the central Pacific. This regional feature evidently affects the CO<jats:sub>2<\/jats:sub> concentration field in the vicinity of the FGGE data set, but it may not represent a global feature.<\/jats:p>","DOI":"10.1029\/jd091id07p07765","type":"journal-article","created":{"date-parts":[[2008,2,6]],"date-time":"2008-02-06T19:18:54Z","timestamp":1202325534000},"page":"7765-7781","source":"Crossref","is-referenced-by-count":36,"title":["Meridional eddy diffusion model of the transport of atmospheric carbon dioxide: 1. Seasonal carbon cycle over the tropical Pacific Ocean"],"prefix":"10.1029","volume":"91","author":[{"given":"Martin","family":"Heimann","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Charles D.","family":"Keeling","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"13","published-online":{"date-parts":[[2012,9,21]]},"reference":[{"key":"e_1_2_1_2_1","first-page":"51","article-title":"Atmospheric carbon dioxide and radiocarbon in the natural carbon cycle, II, Changes from A.D. 1700 to 2070 as deduced from a geochemical model, in Carbon and the Biosphere","volume":"24","author":"Bacastow R.","year":"1973","journal-title":"Brookhaven Symp. Biol."},{"key":"e_1_2_1_3_1","unstructured":"Bacastow R. B. C. D.Keeling P. R.Guenther D. J.Moss Scripps reference gas calibrating system for carbon dioxide in nitrogen standards: Revision of 1980 report 64Scripps Inst. of Oceanogr. La Jolla Calif. 1983a."},{"key":"e_1_2_1_4_1","unstructured":"Bacastow R. B. C. D.Keeling P. R.Guenther D. J.Moss Scripps reference gas calibrating system for carbon dioxide in air standards: Revision of 1981 report 33Scripps Inst. of Oceanogr. La Jolla Calif. 1983b."},{"key":"e_1_2_1_5_1","volume-title":"Data Reduction and Error Analysis for the Physical Sciences","author":"Bevington P. R.","year":"1969"},{"key":"e_1_2_1_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.2153-3490.1970.tb00508.x"},{"key":"e_1_2_1_7_1","doi-asserted-by":"publisher","DOI":"10.1029\/JZ068i013p03899"},{"key":"e_1_2_1_8_1","volume-title":"Conduction of Heat in Solids","author":"Carslaw H. S.","year":"1978"},{"key":"e_1_2_1_9_1","doi-asserted-by":"publisher","DOI":"10.1029\/JC088iC13p08379"},{"key":"e_1_2_1_10_1","doi-asserted-by":"crossref","first-page":"57","DOI":"10.1016\/S0065-2687(08)60571-3","article-title":"Studies of interhemispheric exchange in the troposphere by a diffusion model","volume":"18","author":"Czeplak G.","year":"1974","journal-title":"Adv. Geophys."},{"key":"e_1_2_1_11_1","volume-title":"Applied Regression Analysis","author":"Draper N.","year":"1981"},{"key":"e_1_2_1_12_1","doi-asserted-by":"publisher","DOI":"10.1029\/JC088iC06p03591"},{"key":"e_1_2_1_13_1","unstructured":"Fung I. Analysis of the seasonal and geographic patterns of atmospheric CO2distribution with a three\u2010dimensional tracer modelSixth ORNL Life Sciences Symposium Knoxville TennesseeOak Ridge Natl. Lab.Oak Ridge Tenn. 1986."},{"key":"e_1_2_1_14_1","doi-asserted-by":"publisher","DOI":"10.1029\/JC088iC02p01281"},{"key":"e_1_2_1_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.2153-3490.1982.tb01828.x"},{"key":"e_1_2_1_16_1","unstructured":"Heimann M. Modellstudien zum Verhalten des CO2und14C in der Atmosph\u00e4re Ph.D. thesis University of Bern Switzerland 1982."},{"key":"e_1_2_1_17_1","doi-asserted-by":"crossref","unstructured":"Heimann M. C. D.Keeling I. Y.Fung Simulating the atmospheric carbon dioxide distribution with a three\u2010dimensional tracer modelSixth ORNL Life Sciences Symposium Knoxville TennesseeOak Ridge Natl. Lab.Oak Ridge Tenn. 1986.","DOI":"10.1007\/978-1-4757-1915-4_2"},{"key":"e_1_2_1_18_1","doi-asserted-by":"crossref","first-page":"422","DOI":"10.3402\/tellusa.v20i3.10021","article-title":"Some aspects of the seasonal variation of carbon dioxide and ozone","volume":"20","author":"Junge C. E.","year":"1968","journal-title":"Tellus"},{"key":"e_1_2_1_19_1","doi-asserted-by":"publisher","DOI":"10.1029\/JD091iD07p07782"},{"key":"e_1_2_1_20_1","doi-asserted-by":"publisher","DOI":"10.1029\/JB073i014p04511"},{"key":"e_1_2_1_21_1","doi-asserted-by":"publisher","DOI":"10.1029\/JD089iD03p04615"},{"key":"e_1_2_1_22_1","unstructured":"Keeling C. D. A. F.Carter P. R.Guenther Seasonal and meridional variations of atmospheric carbon dioxide over the tropical Pacific ocean reportScripps Inst. of Oceanogr. La Jolla Calif. 1985."},{"key":"e_1_2_1_23_1","doi-asserted-by":"crossref","first-page":"33","DOI":"10.1016\/S0065-2687(08)60570-1","article-title":"Global scale atmospheric mixing","volume":"18","author":"Machta L.","year":"1974","journal-title":"Adv. Geophys."},{"key":"e_1_2_1_24_1","unstructured":"Oort A. H. Global atmospheric statistics 1958\u20131973 NOAA Prof Pap. 14 180 Natl. Oceanic and Atmos. Admin. 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