The paper deals with asymptotic behavior of solutions to the 2D viscous incompressible micropolar fluid flows in the whole space . These flows described by the equations
where is the velocity vector field, is the pressure, is the scalar gyration field, is the given body force, is the given scalar body moment, is the Newtonian kinetic viscosity, is a gyration parameter, and are gyration viscosity coefficients. Here
It is proved that the problem has a unique solution. The time decay estimates of this solution in and norms are obtained.