Sensitivity of CO₂ and CH₄ Annual Cycles to Different Meteorological Variables at a Rural Site in Northern Spain

Table 4

Recirculation factor calculated in different studies.

Site	Recirculation factor (average)	Period (years)	Reference
Portugal	0.10–0.39	9	[41]
India	0.15–0.24	5	[42]
Argentina	0.16–0.25	2	[43]
India	0.21–0.27	6	[44]
Korea	0.23–0.33	2	[45]
Oman	0.26–0.48	5	[46]
Israel	0.27–0.53	5	[47]