Figure 5. Measured isoprene concentrations (solid squares) in 1996, together with the temperature dependent part of the isoprene emission factor (solid line), calculated according to Guenther et al., JGR 98, 1993. In terrestrial environments, the concentrations follow the temperature, but in early summer and at low concentrations there is a discrepancy. This may be due to the uncertainty of the emission coefficient at low temperatures, or due to its dependency on the stage of the growing season. At the marine site of Utö, the isoprene concentration is not dependent on temperature.
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