Secondary organic aerosol (SOA) particles are formed in the atmosphere from condensable oxidation products of anthropogenic and biogenic volatile organic compounds (VOCs). On a global scale, biogenic VOCs account for about 90% of VOC emissions and of SOA formation (90 billion kilograms of carbon per year). SOA particles can scatter radiation and act as cloud condensation or ice nuclei, and thereby influence the Earth’s radiation balance and climate.

Organic aerosol particles are ubiquitous in the atmosphere. In forests, such particles can occur in solid form — a finding that will lead to a re-evaluation of how they are formed, and their properties and effects.

Almost five months after the state-of-the-art radar, S Band, arrived in the city for more accurate weather prediction, it seems that the technology will not be put to use this monsoon. The reason: India Meteorological Department is yet to finish the earthing and wiring which would make the radar operational.

The Bharat Electronics Limited (BEL) made radar arrived in the city this April.

Using satellite data, scientists have produced a first-of-its kind map that details the height of the world's forests. Although there are other local- and regional-scale forest canopy maps, the new map is the first that spans the entire globe based on one uniform method.

Divya Gandhi

The evidence is in: the gas we breathe is becoming scarcer

The seasonal variability of phytoplankton biomass in the Arabian Sea, though a well researched topic, its inter-annual variability is less explored and understood. Analysis of the satellite-derived chlorophyll pigment concentration in the Arabian Sea during 1997

The combined global land and ocean average surface temperature for June 2010 was the warmest on record at 16.2

With growing importance being placed on climate change and mitigation strategies, India's space agency ISRO is in the process of launching a satellite to study greenhouse gases.

Richard Black

Simulation showed temperature falling decades after CO {-2}'s decline

Canada and Russia would receive more rain and snow

Impacts of manmade greenhouse warming on rainfall would endure long after temperatures fell, a study suggests.