Determining the nitrous oxide transfer velocity and emission factor of an agricultural drain

Figures & data

Figure 1. Photograph of the agricultural drain during experiment 2 on 12 August 2015, looking South, the direction the water was flowing.

Table 1. The nitrous oxide () transfer velocity from an agricultural drain to the atmosphere (, mean ± SE) determined by experiments 1 (20 January 2015) and 2 (12 August 2015).

Date	measured by a tracer method	measured by a chamber method	estimated following O’Connor and Dobbins (1958)
	m d^−1	m d^−1	m d^−1
20 January 2015	6.6 ± 0.6	No data	5.1 ± 1.0
12 August 2015	3.8 ± 0.6	4.8 ± 0.4	3.9 ± 0.6

Notes: As described in the text, the measurements used tracer and chamber methods. The estimates were based on hydraulic measurements and a relationship reported by O’Connor and Dobbins (1958).

O’Connor DJ, Dobbins E. 1958. Mechanisms of reaeration in natural streams. Transactions of the American Society of Civil Engineers. 123:641–684.

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