The Institute for Meteorology and Climate Research (IMK) consists of four divisions, two of which are jointly operated by the Campus South (former University of Karlsruhe) and the Campus North (former Karlsruhe Research Centre). They work on atmospheric processes of the troposphere (IMK-TRO) as well as of atmospheric trace gases and remote sensing (IMK-ASF). A third division, the Atmospheric Aerosol Research (IMK-AAF) is jointly operated with the Institut für Umweltphysik of the University of Heidelberg. Since January 2002 the Institute of the Research of the Atmospheric Environment, former part of the Fraunhofer Gesellschaft, has become the fourth division of the IMK as IMK-IFU.