التفاصيل البيبلوغرافية
| العنوان: |
Toward Direct Measurement of Atmospheric Nucleation. |
| المؤلفون: |
Kulmata, Markku1 kulmala@pcu.helsinki.fi, Riipinen, Ilona1, Sipilä, Mikko1, Manninen, Hanna E.1, Petäjä, Tuukka1, Junninen, Heikki1, Maso, Miikka Dat1, Mordas, Genrik1, Mirme, Aadu2, Vana, Marko1,2, Hirsikko, Anne1, Laakso, Lauri1, Harrison, Roy M.3, Hanson, Ian3, Leung, Cart3, Lehtinen, Karl E. J.4, Kerminen, Veti-Matti5 |
| المصدر: |
Science. 10/5/2007, Vol. 318 Issue 5847, p89-92. 4p. 5 Graphs. |
| مصطلحات موضوعية: |
*ATMOSPHERIC nucleation, *ATMOSPHERIC aerosols, *AIR quality, *AIR pollution measurement, *AIR pollution monitoring, *NANOTECHNOLOGY, *PARTICULATE matter, *ATMOSPHERIC chemistry, *PHYSICAL & theoretical chemistry |
| مستخلص: |
Atmospheric aerosol formation is known to occur almost all over the world, and the importance of these particles to climate and air quality has been recognized. Although almost all of the processes driving aerosol formation take place below a particle diameter of 3 nanometers, observations cover only larger particles. We introduce an instrumental setup to measure atmospheric concentrations of both neutral and charged nanometer-sized clusters. By applying the instruments in the field, we come to three important conclusions: (i) A pool of numerous neutral clusters in the sub-3 nanometer size range is continuously present; (ii) the processes initiating atmospheric aerosol formation start from particle sizes of ∼1.5 nanometers; and (iii) neutral nucleation dominates over the ion-induced mechanism, at least in boreal forest conditions. [ABSTRACT FROM AUTHOR] |
| قاعدة البيانات: |
Academic Search Index |
