Jökull

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Jökull - 01.12.1987, Qupperneq 42

Jökull - 01.12.1987, Qupperneq 42
Fig. 6. The effect of partial degassing on C02-N2-tem- peratures (A) and calculated steam condensation (B and C). Adiabatic boiling was assumed and an initial N2 concentration of 0.71 mmoles/kg. The curves show how the calculated values for tco N , Zb and Zc relate to N2 degassing of water initially at ^00°C, 250°C and 300°C. — Áhrif hlutaafgösunar djúpvatns á C02-N2-hitastig (A) og á reiknaða gufuþéttingu (B og C). Gert var ráð fyrir innrænni suðu og að upphaflegur styrkur N2 í djúpvatn- inu nœmi 0.71 mmól/kg. Ferlarnir sýna hvernig reiknuð gildi á tco^N , Zb og Zc breytast með N2 afgösun á vatni sem var upphaflega við 200°C, 250°C og 300°C. much lower than those observed. Lack of steam samples from the Krísuvík field giving strongly negative Z-values is thus taken to indicate that the fumarole steam has been derived from undegassed, or little degassed water. Some 30% degassing with respect to N2 would explain the lowest Z-value (sample 5 in Table 4). It should, however, be pointed out that atmospheric contamina- tion which increases the N2 content of the steam samples will have the opposite effect of partial degassing. There- fore, primary N2 degassing may truly be in excess of 30%. The calculated amount of condensation, up to 50%, 40
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