Springtime ecosystem-scale monoterpene fluxes from Mediterranean pine forests across a precipitation gradient

Seco, Roger; Karl, T.; Turnipseed, A.; Greenberg, J.; Llusià, Joan; Peñuelas, Josep; Dicken, Uri; Rotenberg, Eyal; Kim, Saewung; Yakir, Dan

doi:10.1016/j.agrformet.2017.02.007

Cited by 23 publications

(22 citation statements)

References 81 publications

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“…forests in Israel (~200 Seco et al, 2017), the corresponding measured mixing ratios in our study are generally higher than those measured in those two sites, where in only a few cases the MT mixing ratios reached above 0.5 ppbv for Birya, and the maximum was 0.2 ppbv in Yatir. Note that the https://doi.org/10.5194/acp-2019-1170 Preprint.…”

Section: Origin and Characterization Of Other Bvocscontrasting

confidence: 74%

Emission of biogenic volatile organic compounds from warm and oligotrophic seawater at the Eastern Mediterranean

Dayan¹,

Fredj²,

Misztal³

et al. 2020

Preprint

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Abstract. Biogenic volatile organic compounds (BVOCs) from terrestrial vegetation and marine organisms contribute to photochemical pollution and affect the radiation budget, cloud properties and precipitation via secondary organic aerosol formation. Their emission from both marine and terrestrial ecosystems is substantially affected by climate change in ways that are currently not well characterized. The Eastern Mediterranean Sea was identified as a hotspot for climate change, making it a natural laboratory for investigating the impact of climate change on BVOC emission from both terrestrial and marine vegetation. We quantified the mixing ratios of a suite of volatile organic compounds (VOCs), including isoprene, dimethyl sulfide (DMS), acetone, acetaldehyde and monoterpenes, at a mixed vegetation site ~ 4 km from the southeastern tip of the Levantine Basin, where the sea surface temperature maximizes and ultra-oligotrophic conditions prevail. The measurements were performed between July and October, 2015, using a proton-transfer-reaction–time-of-flight mass spectrometer. The analyses were supported by the Model of Emissions of Gases and Aerosols from Nature (MEGAN 2.1). For isoprene and DMS mixing ratios, we identified a dominant contribution from the seawater. Our analyses further suggest a major contribution at least for monoterpenes from the seawater. Our results indicate that the Levantine Basin greatly contributes to isoprene emission, corresponding with mixing ratios of up to ~ 9 ppbv. This highlights the need to update air-quality and climate models to account for the impact of sea surface temperature (SST) on marine isoprene emission. The DMS mixing ratios were one-to-two orders of magnitude lower than those measured in 1995 in the same area, suggesting a dramatic decrease in emission due to changes in the species composition induced by the rise in SST.

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Section: Origin and Characterization Of Other Bvocscontrasting

confidence: 74%

Emission of biogenic volatile organic compounds from warm and oligotrophic seawater at the Eastern Mediterranean

Dayan¹,

Fredj²,

Misztal³

et al. 2020

Preprint

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“…Data availability. VOC flux data used in this article, together with PAR, air temperature, and vegetation surface temperature, are available for download at https://doi.org/10.5281/zenodo.3886457 (Seco et al, 2020). CO 2 , H 2 O, and CH 4 fluxes and wind direction and speed can be downloaded from http://www.icos-etc.eu/home/ site-details?id=SE-St1 (Jansen et al, 2019b).…”

Section: Discussionmentioning

confidence: 99%

Volatile organic compound fluxes in a subarctic peatland and lake

et al. 2020

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Abstract. Ecosystems exchange climate-relevant trace gases with the atmosphere, including volatile organic compounds (VOCs) that are a small but highly reactive part of the carbon cycle. VOCs have important ecological functions and implications for atmospheric chemistry and climate. We measured the ecosystem-level surface–atmosphere VOC fluxes using the eddy covariance technique at a shallow subarctic lake and an adjacent graminoid-dominated fen in northern Sweden during two contrasting periods: the peak growing season (mid-July) and the senescent period post-growing season (September–October). In July, the fen was a net source of methanol, acetaldehyde, acetone, dimethyl sulfide, isoprene, and monoterpenes. All of these VOCs showed a diel cycle of emission with maxima around noon and isoprene dominated the fluxes (93±22 µmol m−2 d−1, mean ± SE). Isoprene emission was strongly stimulated by temperature and presented a steeper response to temperature (Q10=14.5) than that typically assumed in biogenic emission models, supporting the high temperature sensitivity of arctic vegetation. In September, net emissions of methanol and isoprene were drastically reduced, while acetaldehyde and acetone were deposited to the fen, with rates of up to -6.7±2.8 µmol m−2 d−1 for acetaldehyde. Remarkably, the lake was a sink for acetaldehyde and acetone during both periods, with average fluxes up to -19±1.3 µmol m−2 d−1 of acetone in July and up to -8.5±2.3 µmol m−2 d−1 of acetaldehyde in September. The deposition of both carbonyl compounds correlated with their atmospheric mixing ratios, with deposition velocities of -0.23±0.01 and -0.68±0.03 cm s−1 for acetone and acetaldehyde, respectively. Even though these VOC fluxes represented less than 0.5 % and less than 5 % of the CO2 and CH4 net carbon ecosystem exchange, respectively, VOCs alter the oxidation capacity of the atmosphere. Thus, understanding the response of their emissions to climate change is important for accurate prediction of the future climatic conditions in this rapidly warming area of the planet.

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“…The soil turnover times were calculated from the 2016 stocks and the following fluxes: R h for soil (τ soil_Rh ), and R a for standing biomass (τ tree_Ra ), and R e for the ecosystem (τ eco_Re ). Nonrespiratory carbon loss to VOC, which could have influenced our estimates, was recently shown to be a very minor flux (Seco et al, 2017).…”

Section: Carbon Turnovermentioning

confidence: 93%

Evidence for large carbon sink and long residence time in semiarid forests based on 15 year flux and inventory records

Qubaja

Grünzweig

Rotenberg

et al. 2019

Global Change Biology

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The rate of change in atmospheric CO2 is significantly affected by the terrestrial carbon sink, but the size and spatial distribution of this sink, and the extent to which it can be enhanced to mitigate climate change are highly uncertain. We combined carbon stock (CS) and eddy covariance (EC) flux measurements that were collected over a period of 15 years (2001–2016) in a 55 year old 30 km2 pine forest growing at the semiarid timberline (with no irrigating or fertilization). The objective was to constrain estimates of the carbon (C) storage potential in forest plantations in such semiarid lands, which cover ~18% of the global land area. The forest accumulated 145–160 g C m−2 year−1 over the study period based on the EC and CS approaches, with a mean value of 152.5 ± 30.1 g C m−2 year−1 indicating 20% uncertainty in carbon uptake estimates. Current total stocks are estimated at 7,943 ± 323 g C/m2 and 372 g N/m2. Carbon accumulated mostly in the soil (~71% and 29% for soil and standing biomass carbon, respectively) with long soil carbon turnover time (59 years). Regardless of unexpected disturbances beyond those already observed at the study site, the results support a considerable carbon sink potential in semiarid soils and forest plantations, and imply that afforestation of even 10% of semiarid land area under conditions similar to that of the study site, could sequester ~0.4 Pg C/year over several decades.

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Springtime ecosystem-scale monoterpene fluxes from Mediterranean pine forests across a precipitation gradient

Cited by 23 publications

References 81 publications

Emission of biogenic volatile organic compounds from warm and oligotrophic seawater at the Eastern Mediterranean

Emission of biogenic volatile organic compounds from warm and oligotrophic seawater at the Eastern Mediterranean

Volatile organic compound fluxes in a subarctic peatland and lake

Evidence for large carbon sink and long residence time in semiarid forests based on 15 year flux and inventory records

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