Announcing the release of MCIP Version 2.1 (27 March 2003).

This version of MCIP2 focuses on correcting various algorithmic bugs.
These bugs generally exist in previous versions of MCIP1 and MCIP2.
However, the corrections have only been made in MCIP2; there is no
plan to update MCIP1 with these changes.  Users are urged to upgrade
code to MCIP Version 2.1 as soon as possible.

Another update to MCIP2 is anticipated in Summer 2003 to include
scientific updates to the dry deposition schemes with an emphasis
on winter simulations.

The following are the major changes in MCIP Version 2.1:

- Corrected layer collapsing for UHAT_S and VHAT_T (horizontal wind
  components coupled with map-scale factors on the Arakawa-C grid).
  In previous versions of MCIP1 and MCIP2, these two fields were
  inadvertently filled directly from the lowest NLAYS layers of the
  input meteorology data set without collapsing.

- Corrected translation of output horizontal wind components from
  dot points (Arakawa-B grid) to flux points (Arakawa-C grid).

- Changed collapsing of Jacobian to be collapsing of Jacobian coupled
  with density for better mass conservation.  Changed collapsing of
  flux-point winds to be coupled with Jacobian and density for better
  mass conservation.

- Corrected the calculation of the mid-layer density to use virtual
  temperature.

- Corrected vertical weighting in algorithms used to define vertical
  component of wind.

- Corrected algorithm to calculate non-hydrostatic vertical component
  of wind from horizontal and vertical components of wind.

- Modified definitions of I/O API header variables that are calculated
  in MCIP2 from MM5 header variables to minimize real number round-off
  issues.

- Removed unused variable JDRATE from METCRO3D.

- Simplified algorithm to map input meteorology to MCIP_X domain.

- Expanded MCIP_X dot-point arrays to (NCOLS_X+1, NROWS_X+1).

- Constrained calculation of non-PBL parameters with user option LRAD
  in the PBL rediagnosis routine (LPBL=2,3).