Lithuanian Journal of Physics article / Lietuvos fizikos žurnalo straipsnis

NOCTURNAL AEROSOL PARTICLE FORMATION IN THE NORTH CHINA PLAIN
Simonas Kecorius^a,b, Shenglan Zhang^b,c,d, Zhibin Wang^b,e, Johannes Größ^b, Nan Ma^b, Zhijun Wu^f, Liang Ran^c, Min Hu^f, Pucai Wang^c, Vidmantas Ulevičius^a, and Alfred Wiedensohler^b
^aCenter for Physical Sciences and Technology, Savanorių Ave. 231, LT-02300 Vilnius, Lithuania
^bLeibniz Institute for Tropospheric Research, Leipzig 04318, Germany
E-mail: ma@tropos.de
^cKey Laboratory of Middle Atmosphere and Global Environment Observation, Institute of Atmospheric Physics, Chinese Academy of Sciences, Beijing 100029, China
^dChengdu University of Information Technology, Chengdu 610225, China
^eMultiphase Chemistry Department, Max Planck Institute for Chemistry, Mainz 55128, Germany
^fCollege of Environmental Sciences and Engineering, Peking University, Beijing 100871, China

Received 13 October 2014; revised 10 November 2014; accepted 10 December 2014

New particle formation is one of the major sources of atmospheric aerosol particles. Beside daytime nucleation, nocturnal new particle formation was also found in different regions around the world. Compared with daytime nucleation events, the understanding of nocturnal ones is still sparse. The variety of aerosol particle physico-chemical properties, including particle number size distribution, volatility and hygroscopicity were measured in the North China Plain during July–August 2013. During the observation period, rapid increase in ultrafine particle number concentration was attributed to new particle formation. The nocturnal new particle formation rate was 45 cm^–3s^–1, which is 1.25 times higher than an observed daytime value. Condensation sink was found to be 0.055 s^–1.

Keywords: nocturnal nucleation, particle number size distribution
PACS: 92.60.Mt

NAKTINIS AEROZOLIO DALELIŲ SUSIDARYMAS ŠIAURINĖJE KINIJOS LYGUMOJE

Simonas Kecorius^a,b, Shenglan Zhang^b,c,d, Zhibin Wang^b,e, Johannes Größ^b, Nan Ma^b, Zhijun Wu^f, Liang Ran^c, Min Hu^f, Pucai Wang^c, Vidmantas Ulevičius^a, Alfred Wiedensohler^b
^aValstybinis mokslinių tyrimų institutas Fizinių ir technologijos mokslų centras, Vilnius, Lietuva
^bLeibnico troposferos tyrimų institutas, Leipcigas, Vokietija
^cKinijos mokslų akademijos Atmosferos fizikos institutas, Pekinas, Kinija
^dČengdu informacijos technologijos universitetas, Čengdu, Kinija
^eMakso Planko chemijos institutas, Maincas, Vokietija
^fPekino universiteto Aplinkos mokslų ir inžinerijos koledžas, Pekinas, Kinija

2013 m. liepos mėn. Sianghe mieste (Hebėjaus provincija, Kinija) vykdytų išskirtinių aerozolio dalelių fizikinių-cheminių savybių tyrimų metu buvo tirtas retas naktinis dalelių susidarymas ir jį lemiančios priežastys. Panaudojus moderniausią spektrometrinę aerozolio dalelių matavimo įrangą nustatyta, kad naujų dalelių susidarymas vyko esant aukštam kondensaciniam nuotėkiui, CS = 0,055 s^–1, dalelių susidarymo sparta naktį buvo 1,25 kartus didesnė nei dieną, siekė 45 ± 5 cm^–3 s^–1. Naujų dalelių susidarymo metu skaitinė 2–10 nm dydžio dalelių koncentracijos reikšmė padidėjo nuo N_{2–10 nm} = 2,0 · 10⁴ ± 2000 cm^–3 iki N_{2–10

nm} = 7,3 · 10⁴ ± 7300 cm^–3. Naujai susidariusios 20–35 nm dydžio dalelės pasižymėjo itin dideliu lakumu ir mažu higroskopiškumu. Po dalelių išgarinimo 300 °C temperatūroje buvo užregistruota tik smulki liekamoji frakcija antrojo diferencialinio dalelių judrio analizatoriaus išėjime. Ši frakcija siejama su dalelėse vykstančiu polimerizacijos vyksmu, kai ant jos paviršiaus kondensuojasi organiniai junginiai. Naujai susiformavusių aerozolio dalelių populiacija, patekusi į 87 % santykinės oro drėgmės kamerą, augo vienodai ir pasižymėjo GF = 1,15 augimo koeficientu. Atlikus vietovės galimų šaltinių analizę nustatyta, kad naktinis naujų dalelių susidarymas yra nulemtas aukštos santykinės oro drėgmės (>98 %), vėjo krypties ir iš gyvenamųjų teritorijų atnešamų lakiosios organikos (amino) ir NH₃ junginių.

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