Development of the CMA-GFS-AERO 4D-Var assimilation system v1.0- Part 1: System description and preliminary experimental results

<table> <tbody> <tr> <td> <p><span>DA_BC</span></p> </td> <td> <p><span>Assimilating only BC surface observations while excluding operational meteorological observations</span></p> </td> </tr> <tr> <td> <p><span>DA_MET</span></p> </td> <td> <p><span>Assimilating only operational meteorological observations while excluding BC surface observations</span></p> </td> </tr> <tr> <td> <p><span>DA_MET_then_BC</span></p> </td> <td> <p><span>First assimilating operational meteorological observations, then assimilating BC surface observations</span></p> </td> </tr> <tr> <td> <p><span>DA_MET_BC_simult</span></p> </td> <td> <p><span>Assimilating both operational meteorological and BC surface observations </span><span>simultaneously</span></p> </td> </tr> <tr> <td>code.zip</td> <td>Including black carbon observation preprocessing codes, black carbon observation operator codes, black carbon module tangent and adjoint interface codes, the CMA-GFS-AERO 4D-Var main program,and drawing script.</td> </tr> </tbody> </table>