The ultimate aim of the CCOntrails Spreading into Cirrus (COSIC) project is, for the first time, to build a physically based parameterization of aviation induced cirrus to determine its role in climate change. The project aims to conduct studies of water vapour, ice crystal habit, turbulence and radiative properties of contrail as it either spreads into cirrus or dissipates. Boundary conditions for LEM studies of contrail lifecycles will be delivered and Measurements of radiative forcing from spreading contrail taken for comparison to other cases. Case studies for testing later contrail cirrus parameterization in the Unified Model will be also be considered.

Airborne atmospheric measurements from core and non-core instrument suites data on board the FAAM BAE-146 aircraft during flight 14 for COALESC - 2011 Cloud physics and radiation studies and COSIC - COntrails Spreading into Cirrus projects.

Airborne atmospheric measurements from core and non-core instrument suites data on board the FAAM BAE-146 aircraft collected for COSIC - COntrails Spreading into Cirrus project.

Airborne atmospheric measurements from core instrument suite data on board the FAAM BAE-146 aircraft during flight 11 for COALESC - 2011 Cloud physics and radiation studies and COSIC - COntrails Spreading into Cirrus projects.

Airborne atmospheric measurements from core and non-core instrument suites data on board the FAAM BAE-146 aircraft collected for COSIC - COntrails Spreading into Cirrus project.

Airborne atmospheric measurements from core and non-core instrument suites data on board the FAAM BAE-146 aircraft collected for Variational Assimilation of Cloud Affected Radiances (VACAR) and COSIC - COntrails Spreading into Cirrus projects.

In-situ airborne observations by the FAAM BAE-146 aircraft for Variational Assimilation of Cloud Affected Radiances (VACAR) with accompanying surface based UV Raman lidar observations from the Chilbolton Observatory, Hampshire