expedition. For this purpose, the average N20 value was determined from each pair of parallel measurements. The deviations of the corresponding single values from this average were used to calculate a quasi standard deviation, whose percentage from the average of all measurements of one expedition was ±1.7% for the 1970 expedition and ±1.45% for the 1971 expedition. As mentioned previously, for 15-to 20-liter air samples the standard deviation from laboratory experiments was ±1.4%. Accordingly, the ac ual accuracy aboard ship is comparable with that from laboratory experiments. The slightly increased value from the 1970 expedition may be due to unfavorable weather conditions.At some stations in the Atlantic Ocean, parallel samples were taken from the sea surface water. The N20 values from these parallel samples suggest an actual accuracy for N20 measurements in sea water aboard ship better than ± 3 %.In a recent paper, LaHue et al. ( 8) described an analytical method for measurements of the atmospheric N20. This
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