The Institute of Meteorology and Climate Research (IMK) consists of four divisions, two of which are jointly operated by the KIT-Campus South (former University of Karlsruhe) and the KIT-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 and with a long history of more than 60 years the Institute of Atmospheric Environment Research, former part of the Fraunhofer Gesellschaft, has become the fourth division of the IMK as IMK-IFU at KIT-Campus Alpin in Garmisch-Partenkirchen.