The Integrated Campaign for Aerosols, gases and Radiation
Budget (ICARB) was a multi- institutional, multi-instrumental,
multi-platform field campaign, where integrated observation and measurements
of aerosols with special emphasis on black carbon, radiation and trace gases
along with other complementary measurements on boundary layers and
meteorological parameters were made simultaneously.
The main goal of the ICARB was to assess the regional
radiative impact of aerosols and trace gases, and to quantify the effect of
the long-range transport of aerosols and trace gases, involving the Indian
mainland, the Arabian Sea, the Bay of Bengal, and tropical Indian Ocean.
The ICARB was conceived as an integrated campaign,
comprising three segments namely the land, ocean, and aircraft segments. In
each one of these segments, measurements of the optical, physical and
chemical properties of atmospheric aerosols were carried out.
The ISRO-GBP is maintaining 32 surface observatories
covering representative locations in India. In all these sites black carbon
measurements have been made. The duration of data available from these sites
vary with location.
ICARB aircraft segment carried out a few measurements of
altitude profiles of black carbon aerosols. Our knowledge on the OC/BC
ratios are based on isolated measurements only. There are several aspects on
which the knowledge and understanding is rather fragmented and inadequate.
These include Vertical distribution of Black Carbon State of mixing of Black
Carbon with other aerosols Organic Carbon / Black Carbon Ratio Effect of
Black Carbon on Cloud Cover and Effect of Black Carbon on Monsoon.