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. The seasonality and interannual variability ofterrestrial carbonyl sulfide (COS) fluxes are poorly constrained. We presentthe first easy-to-use parameterization for the net COS forest sink based on thelongest existing eddy covariance record from a boreal pine forest, covering 32 monthsover 5 years. Fluxes from hourly to yearly scales are reported, with the aimof revealing controlling factors and the level of interannual variability.The parameterization is based on the photosynthetically active radiation,vapor pressure deficit, air temperature, and leaf area index. Waveletanalysis of the ecosystem fluxes confirmed earlier findings frombranch-level fluxes at the same site and revealed a 3 h lag between COSuptake and air temperature maxima at the daily scale, whereas no lag betweenradiation and COS flux was found. The spring recovery of the flux after thewinter dormancy period was mostly governed by air temperature, and the onsetof the uptake varied by 2 weeks. For the first time, we report a significantreduction in ecosystem-scale COS uptake under a large water vapor pressuredeficit in summer. The maximum monthly and weekly median COS uptake varied by26 % and 20 % between years, respectively. The timing of the latter variedby 6 weeks. The fraction of the nocturnal uptake remained below 21 % ofthe total COS uptake. We observed the growing season (April–August) averagenet flux of COS totaling −58.0 g S ha−1 with 37 % interannualvariability. The long-term flux observations were scaled up to evergreenneedleleaf forests (ENFs) in the whole boreal region using the Simple BiosphereModel Version 4 (SiB4). The observations were closely simulated usingSiB4 meteorological drivers and phenology. The total COS uptake by borealENFs was in line with a missing COS sink at high latitudes pointed out inearlier studies.

Long-term fluxes of carbonyl sulfide and their seasonality and interannual variability in a boreal forest