[PDF] https://doi.org/10.3952/physics.v59i1.3940

Open access article / Atviros prieigos straipsnis
Lith. J. Phys. 59, 47–56 (2019)
 

LONG-TERM STUDY OF ATMOSPHERIC MERCURY DEPOSITION AT MONITORING STATIONS IN LITHUANIA
Jonas Šakalys, Kęstutis Kvietkus, Inga Garbarienė, and Andriejus Urba
  State Research Institute Center for Physical Sciences and Technology, Saulėtekio 3, 10257 Vilnius, Lithuania
 E-mail: kestutis.kvietkus@ftmc.lt
Received 12 July 2018; revised 4 October 2018; accepted 15 October 2018

The results of the  long-term study of atmospheric mercury concentrations in the  rain water carried out at the Aukštaitija and Žemaitija integrated monitoring stations are presented in this work. The bulk precipitation samples at both stations were collected every week during the 2007–2017 period. The mercury measurement method is based on the absorption of radiation by mercury vapour at the 253.7 nm line. The monthly samples of precipitation after preparation were analysed using a mercury analyzer ‘Gardis’ developed at our institution. The average annual concentrations, deposition amounts and trends of mercury in the precipitation over the period of 2007–2017 were analysed. The tendency of average monthly mercury concentrations in the precipitation at the Žemaitija station was continuously increasing before 2011, however, after 2012 it has a decreasing tendency which was contrary to that at the Aukštaitija station. At the same time, the tendencies of average monthly amounts of mercury deposited with precipitation showed decreasing amounts, especially at the Žemaitija station. Explanation of the above-mentioned phenomenon is complicated and the main reason is very changeable air mass trajectories and irregularity of precipitation.
Keywords: mercury, atmosphere, precipitation, concentration, deposition
PACS: 92.60.Sz, 92.60.Fm, 92.60.Jq, 92.70.Cr

GYVSIDABRIO NUSĖDIMO IŠ ATMOSFEROS ILGALAIKIAI TYRIMAI LIETUVOS MONITORINGO STOTYSE
Jonas Šakalys, Kęstutis Kvietkus, Inga Garbarienė, Andriejus Urba

Valstybinis mokslinių tyrimų institutas Fizinių ir technologijos mokslų centras, Vilnius, Lietuva
 
laikių matavimų rezultatai Aukštaitijos ir Žemaitijos integruoto monitoringo stotyse (IMS). Lietaus kritulių bandiniai buvo imami kiekvieną savaitę 2007–2017 metais. Gyvsidabrio koncentracijos buvo matuojamos mūsų institucijoje sukurtu atominiu absorbciniu gyvsidabrio analizatoriumi „Gardis“. Prietaisas išbandytas įvairiose interkalibracijose ir yra pripažintas tarptautiniu mastu. Darbe pateiktos vidutinės mėnesinės ir metinės gyv­sidab­rio koncentracijos, jų kitimas dešimties metų laikotarpiu ir nusėdimo kiekių į žemės paviršių analizė. Vakarinėje Lietuvos dalyje vidutinės mėnesinės gyvsidabrio koncentracijos krituliuose pamažu didėjo iki 2011  m., tačiau nuo 2012 m. buvo pastebėta gyvsidabrio koncentracijos mažėjimo tendencija. Rytinėje Lietuvos dalyje stebima priešinga gyvsidabrio koncentracijos svyravimo krituliuose eiga (iki 2011 m. ‒ mažėja, nuo 2012 m. ‒ didėja). Tuo pat metu nustatyta bendra abiems stotims žemės paviršiaus apkrovos Hg mažėjimo tendencija, ypač ryški Žemaitijos IMS. Anksčiau aprašytus reiškinius būtų galima paaiškinti didele oro masių pernašos trajektorijų kaita ir kritulių nereguliarumu abiejose tyrimų stotyse.

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