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@ARTICLE{Niinemets:13371,
      author       = {Niinemets, Ü. and Monson, R.K. and Arneth, A. and
                      Ciccioli, P. and Kesselmeier, J. and Kuhn, U. and Noe, S.M.
                      and Penuelas, J. and Staudt, M.},
      title        = {{T}he leaf-level emission factor of volatile isoprenoids:
                      caveats, model algorithms, response shapes and scaling},
      journal      = {Biogeosciences},
      volume       = {7},
      issn         = {1726-4170},
      address      = {Katlenburg-Lindau [u.a.]},
      publisher    = {Copernicus},
      reportid     = {PreJuSER-13371},
      pages        = {1809 - 1832},
      year         = {2010},
      note         = {This paper arose as the result of stimulating discussions
                      at the European Science Foundation (VOCBAS and INTROP
                      programmes) science meeting Biogenic Volatile Organic
                      Compounds: Sources and Fates in a Changing World, 2
                      October-5 October 2007, Montpellier, France. The authors'
                      work on BVOC emissions has been supported by the Estonian
                      Ministry of Education and Research (grant SF1090065s07), the
                      Estonian Science Foundation (grant 7645), the US National
                      Science Foundation and the US Environmental Protection
                      Agency, the join collaborative project between Spanish CSIC
                      and the Estonian Academy of Sciences, the Spanish Government
                      (grants CGL2006-04025/BOS and Consolider-Ingenio Montes
                      CSD2008-00040), the Catalan government (grant SGR2009-458),
                      the Human Frontier Science Programme, the Swedish Research
                      Councils VR and Formas. We thank Rudiger Grote, Alex
                      Guenther, Peter Harley, Trevor Keenan, Thomas Karl, Manuel
                      Lerdau and Georg Wohlfahrt for illuminating comments on the
                      manuscript.},
      abstract     = {In models of plant volatile isoprenoid emissions, the
                      instantaneous compound emission rate typically scales with
                      the plant's emission potential under specified environmental
                      conditions, also called as the emission factor, E-S. In the
                      most widely employed plant isoprenoid emission models, the
                      algorithms developed by Guenther and colleagues (1991,
                      1993), instantaneous variation of the steady-state emission
                      rate is described as the product of E-S and light and
                      temperature response functions. When these models are
                      employed in the atmospheric chemistry modeling community,
                      species-specific E-S values and parameter values defining
                      the instantaneous response curves are often taken as
                      initially defined. In the current review, we argue that E-S
                      as a characteristic used in the models importantly depends
                      on our understanding of which environmental factors affect
                      isoprenoid emissions, and consequently need standardization
                      during experimental E-S determinations. In particular, there
                      is now increasing consensus that in addition to variations
                      in light and temperature, alterations in atmospheric and/or
                      within-leaf CO2 concentrations may need to be included in
                      the emission models. Furthermore, we demonstrate that for
                      less volatile isoprenoids, mono- and sesquiterpenes, the
                      emissions are often jointly controlled by the compound
                      synthesis and volatility. Because of these combined
                      biochemical and physico-chemical drivers, specification of
                      E-S as a constant value is incapable of describing
                      instantaneous emissions within the sole assumptions of
                      fluctuating light and temperature as used in the standard
                      algorithms. The definition of E-S also varies depending on
                      the degree of aggregation of E-S values in different
                      parameterization schemes (leaf- vs. canopy- or region-scale,
                      species vs. plant functional type levels) and various
                      aggregated E-S schemes are not compatible for different
                      integration models. The summarized information collectively
                      emphasizes the need to update model algorithms by including
                      missing environmental and physico-chemical controls, and
                      always to define E-S within the proper context of model
                      structure and spatial and temporal resolution.},
      keywords     = {J (WoSType)},
      cin          = {IEK-8},
      ddc          = {570},
      cid          = {I:(DE-Juel1)IEK-8-20101013},
      pnm          = {Atmosphäre und Klima},
      pid          = {G:(DE-Juel1)FUEK491},
      shelfmark    = {Ecology / Geosciences, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000279390700001},
      doi          = {10.5194/bg-7-1809-2010},
      url          = {https://juser.fz-juelich.de/record/13371},
}