Paleoaltimetry: Geochemical and Thermodynamic Approaches by Matthew Kohn

By Matthew Kohn

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The vertical trajectories themselves can wander horizontally in an arbitrarily complex way as the parcel ascends. The chief physical assumption is that the air parcel remains relatively isolated from the surrounding air. Although turbulence, among other processes, no doubt contribute to isotopic lapse rates of precipitation in real world orographic settings, the fit of observed isotopic lapse rates with model predictions implies that the model captures the main features determining the relationship between elevation and isotopic composition in many low latitude settings (Rowley et al.

Each of the data sets, the weighted mean isotopic compositions for 1983, 1984, and the average for the interval from 1982 to 1986 as derived from Table 6, rather than Table 5, of Gonfiantini et al. (2001) are normalized relative to the 0 m intercept of linear regressions of each subset of station elevation against δ18Op, so that they are plotted as Δ(δ18Op). Also included are the isotopic compositions of small tributaries with samples from 2004 and 2005 as a function of elevation from Garzione et al.

Cameroon Mt. Cameroon Mt. Cameroon Mt. Cameroon Mt. Cameroon Mt. Cameroon Mt. Cameroon Mt. Cameroon Mt. Cameroon Mt. Cameroon Bolivian Andes Bolivian Andes Bolivian Andes Bolivian Andes Bolivian Andes GNIP Brazil-Peru GNIP Brazil-Colombia 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 2 2 (1) Gonfiantini et al. (2001), (2) (IAEA-Yearly 2004). 2‰ of the stations below 100 m elevation. 2‰ at Trinidad. 4‰. et al. 2001-Fig. 8). Figure 7 shows the revised model results in which both the weighted mean and the confidence intervals are computed as averages of elevation at each Δ(δ18Op), and with the revision of the sampling height of the condensate to 2,000±500 m.

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