Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

ABIOTIC STRESS IMPACT ON AEROSOL MASS SPECTRA OVER A FOREST SITE IN LITHUANIA
Julija Pauraitė^a, Steigvilė Byčenkienė^a, Kristina Plauškaitė^a, Algirdas Augustaitis^b, Vitas Marozas^b, Gintautas Mozgeris^b, Ainis Pivoras^b, Gintaras Pivoras^b, and Vidmantas Ulevičius^a
^aCenter for Physical Sciences and Technology, Saulėtekio 3, 10257 Vilnius, Lithuania
^bVytautas Magnus University, Studentų 13, 53362 Kaunas, Lithuania
Email: julija.pauraite@ftmc.lt

Received 26 May 2019; revised 10 September 2019; accepted 30 September 2019

Volatile organic compounds (VOCs) emitted by trees in response to abiotic stress evoke high levels of secondary organic aerosol (SOA) compounds. Few techniques exist to provide chemically-resolved submicron (PM₁) particle mass concentrations and source apportionment of stress-induced emissions from trees and SOA formation. The chemical composition of atmospheric aerosol particles was characterized using an aerosol chemical speciation monitor (ACSM) at a mixed-mature forest site – the Aukštaitija Integrated Monitoring Station in the eastern part of Lithuania. The organic fraction of PM₁ consisted of SOA (76%) and of anthropogenic combustion related primary organic aerosol (POA) (24%). The analysis of tree trunk circumference revealed three shrinkage and three normal increase episodes. During the episodes of tree trunk circumference shrinkage, several m/z signal (m/z 42, 43, 45, 48, 50) intensities were found to be magnified together with the daily SOA concentration. The stress response analysis confirm that tree trunk circumference shrinkage may be observed through the enhancement of selected m/z signals and result in increased SOA levels.

Keywords: aerosol, SOA, ACSM, tree trunk circumference
PACS: 92.60.Mt, 33.15.Ta

ABIOTINIO STRESO ĮTAKA AEROZOLIO DALELIŲ MASĖS SPEKTRUI MIŠKO APLINKOJE LIETUVOJE
Julija Pauraitė^a, Steigvilė Byčenkienė^a, Kristina Plauškaitė^a, Algirdas Augustaitis^b, Vitas Marozas^b, Gintautas Mozgeris^b, Ainis Pivoras^b, Gintaras Pivoras^b, Vidmantas Ulevičius^a

^aFizinių ir technologijos mokslų centras, Vilnius, Lietuva
^bVytauto Didžiojo universitetas, Kaunas, Lietuva

Abiotinio streso veikiami medžiai išskiria lakius organinius junginius (LOJ), kurie yra antrinių aerozolio dalelių (SOA) prekursoriai. Tyrimo tikslas buvo atlikti submikroninių aerozolio dalelių (PM₁) masės koncentracijos tyrimus ir šaltinių kilmės atskyrimą medžių abiotinio streso sąlygomis formuojantis SOA. Aerozolio cheminė sudėtis Aukštaitijos integruotoje monitoringo stotyje (IMS LT01) rytinėje Lietuvos dalyje mišraus miško aplinkoje buvo išmatuota aerozolio cheminės sudėties monitoriumi (ACSM). Nustatyta, kad PM₁ organikos frakcija sudaryta iš antrinių (76 %) ir pirminių (24 %) aerozolio dalelių. Medžio kamieno skersmens pokyčių analizė parodė tris medžio kamieno skersmens augimo ir susitraukimo epizodus. Esant abiotinio streso sąlygoms, vyksta medžių kamienų skersmens susitraukimo epizodai, todėl išauga m/z 42, 43, 45, 48 ir 50 signalų intensyvumai nuo 5,7 iki 8,8 kartų, o SOA paros koncentracija padidėja nuo 2,7 iki 4,7 kartų. Įprastai augant medžio kamieno skersmeniui m/z signalų intensyvumai ir SOA koncentracija nekinta. Galima teigti, kad augalų patiriamo abiotinio streso atsakas gali būti identifikuojamas per nustatytų m/z signalų intensyvumų pokyčius ir lemti padidėjusią SOA koncentraciją.

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