4. Quasi-biennial oscillation of stratospheric aerosol detected
Stratospheric aerosol is a key component in the concept of geo-engineering because of their ability to create a global dimming. It is therefore important to understand the natural variability of stratospheric aerosol load in order to quantify radiative impact of stratospheric aerosols on the Earth's climate. This study quantifies the influence of quasi-biennial oscillation (QBO) on stratospheric aerosols, when the stratosphere is unperturbed by volcanic eruptions. QBO is a dominant mode of stratospheric variability. Stratospheric aerosol layer extent in the tropics is modulated by QBO by up to 6 km (16-33 km). Strongest signal is detected above 10 hPa pressure level (~31 km), while the signal is moderate below 10 hPa level where aerosol mixing ratio is largest. The study shows that the life cycle of sulfate droplets in the tropical lower stratosphere is influenced by processes which are coupled in a nonlinear manner to QBO.
Reference: Hommel, R., C. Timmreck, M. A. Giorgetta, and H. F. Graf (2015): Quasi-biennial oscillation of the tropical stratospheric aerosol layer, Atmospheric Chemistry and Physics, 15: 5557-5584
5.Europe Aerosols Campaign
Europe Aerosols Campaign is a nice initiative involving student (school and college) community and educating them about aerosol science. The campaign is launched under GLOBE program. Two intensive observation periods are planned for the year 2015 (March 2 to May 8 and Sep-Oct). People are invited to take measurements with sunphotometer (following a common data protocol), upload the data to a common server and even analyze them with the help of aerosol scientists. Low cost sunphotometers can directly be purchased from the authorized vendors. This is a novel concept for spreading awareness and interest about aerosols through direct involvement in data collection and enlarging the measurement network in a systematic framework.
Forthcoming Events
1. 4th Workplace and Indoor Aerosols Conference 2016
The 4th Workplace and Indoor Aerosols Conference will be held in Barcelona, Spain during April 21-22, 2016. The conference website is: http://www.aerosols2016.eu/.
2. Upcoming IGAC Events
Several events related to atmospheric chemistry and aerosols are planned under International Global Atmospheric Chemistry (IGAC) annual program. Detailed information can be found in: http://www.igacproject.org/igac-events.
Editorial Board
Dr Sagnik Dey
Asst Professor
CAS, IIT Delhi
sagnik@cas.iitd.ac.in
Dr P. C. S. Devara
Ex-Scientist and
Advisor IITM, Pune
devara@tropmet.res.in
Dr A Jayaraman
Director
NARL
jayaraman@narl.gov.in
Dr B. K. Sapra
Head, E&BDS, RPAD
BARC
bsapra@barc.gov.in
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