[PDF]    http://dx.doi.org/10.3952/lithjphys.47422

Open access article / Atviros prieigos straipsnis

Lith. J. Phys. 47, 513–521 (2007)


MODELLING OF BIOGENIC VOLATILE ORGANIC COMPOUND EMISSION FOR LITHUANIA*
V. Vėbra, S. Byčenkienė, K. Senuta, and V. Ulevičius
Institute of Physics, Savanorių 231, LT-02300 Vilnius, Lithuania
E-mail: ulevicv@ktl.mii.lt

Received 18 June 2007; accepted 21 November 2007

We present model estimates of biogenic emissions from forests in Lithuania. The numerical modelling of biogenic volatile organic compounds (BVOCs) monoterpene and isoprene was carried out using three-dimensional (3D) mesoscale meteorological and photochemical atmospheric models. Emission factors, combined with land cover data represented by the appropriate 11 Biogenic Emission Inventory System (BEIS) vegetation categories, along with environmental correction factors were used to derive emission fluxes of isoprene, monoterpene, other VOCs, and NO for Lithuania. Moreover, simulated data have been combined with BEIS data using a Geographic Information System (GIS) to appropriately represent the spatial distribution of BVOCs. Calculations showed that the coniferous trees are the main sources of biogenic emissions. The highest emission fluxes of biogenic VOC are estimated to be in the region of the south-southeastern Lithuania, which has the largest forest coverage in Lithuania and the major part of these forests consist of coniferous forests. The total simulated isoprene emission flux from Lithuania (65281 km2) reached 12710 kg h–1 in June and 18280 kg h–1 in July (approximately 34% from coniferous forests). On the other hand, monoterpene average emission flux from Lithuania was found to be 4080 kg h–1 in June and 5330 kg h–1 in July (approximately 50% from coniferous forests).
Keywords: BVOCs, emission, isoprene, monoterpene, numerical modelling, MM5 model
PACS: 92.60.Sz
*The report presented at the 37th Lithuanian National Physics Conference, 11–13 June 2007, Vilnius, Lithuania.


BIOGENINIŲ LAKIŲJŲ ORGANINIŲ JUNGINIŲ EMISIJOS LIETUVOJE MODELIAVIMAS
V. Vėbra, S. Byčenkienė, K. Senuta, V. Ulevičius
Fizikos institutas, Vilnius, Lietuva

Pagrindinis natūralus lakiųjų biogeninių organinių junginių šaltinis yra miškai. Lakiųjų biogeninių organinių junginių izopreno ir monoterpeno erdvinis pasiskirstymas Lietuvoje 2004 m. birželio–liepos mėnesiais įvertintas pritaikius Guenther modelį [13] su tam tikrais pakeitimais dėl vietinių ypatumų. Biogeninių organinių junginių erdvinei analizei atlikti buvo panaudoti emisijos koeficientai, žemės reljefas, BEIS augalų klasifikavimas pagal jų rūšį ir kiti vietiniai aplinkos parametrai. Nustatyta, kad biogeninių organinių junginių emisijos pasiskirstymas Lietuvoje netolygus: stebimas jos padidėjimas pietų–pietvakarių kryptimi ir ryškus sumažėjimas Vilniaus bei Kauno apylinkėse.


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