Announcing the release of MCIP Version 5.0 (August 2019)
The Meteorology-Chemistry Interface Processor (MCIP) ingests output from the Weather Research and Forecasting (WRF) Model to prepare the meteorology files that are used within the CMAQ Modeling System.
The MCIP code is updated to version 5.0. This is a major update to MCIP. Changes to MCIPv5.0 were made by Tanya Spero (U.S. EPA).
MCIPv5.0 accompanies CMAQv5.3. If you are using CMAQv5.3, you should upgrade to use MCIPv5.0.
MCIPv5.0 requires I/O API version 3.1 or greater to support error-checking within the I/O API.
MCIPv5.0 requires the netCDF F90 module (rather than the F77 include).
The following is a summary of the changes in MCIPv5.0:
- Enabled support for WRFv4.0+.
- Enabled support for WRF using the hybrid vertical coordinate.
- Removed support for using files from MM5.
- Overhauled all I/O routines to make internal arrays more generalized to support additional output formats.
- Removed layer collapsing.
- Added an option to write MCIP output in netCDF.
- Updated the units of most output fields to conform to CF compliance.
- Corrected bug in setting land use category names in MCIP for WRF land use classification “USGS24 + lakes”.
- Changed fill value for convective rainfall with “no cumulus parameterization” from -1 to a large negative number to prevent inadvertent use in CCTM and post-processing.
- Corrected error in computing precipitation amounts when the tipping bucket is used and less than 0.5 mm of precipitation accumulated during the same hour that the bucket tips; correct erroneous precipitation spikes.
- Added 7 new 2D variables to the output if the Pleim-Xiu land-surface model is run in WRFv4.1+. These variables can be used to improve the simulation of dust in CCTM.
- Changed the default output wind components to the “face” points (UWIND and VWINDC) from the “dot” points (UWIND and VWIND). The “face” points are on the Arakawa C staggered grid that is used by both WRF and CCTM.
- The “dot” points are on the Arakawa B staggered grid used by MM5.
With MCIPv5.0, the following remain deprecated:
- Including “SOIM1”, “SOIM2”, “SOIT1”, and “SOIT2” in METCRO2D.
Those fields are now in a separate file that includes all soil layers and
their associated depths (SOI_CRO).
- Including “LUFRAC_xx” in GRIDCRO2D. Those fields are now in a separate
file that includes each fractional land use classification (LUFRAC_CRO).
With MCIPv5.0, the following output variables in METCRO2D remain deprecated:
- 2-D cloud fraction (CFRAC)
- cloud top (CLDT)
- cloud bottom (CLDB)
- liquid water content (WBAR)
(They will be removed from METCRO2D in a forthcoming release of MCIP.)
MCIP can be cited with the following reference:
Otte, T. L., and J. E. Pleim, 2010. The Meteorology-Chemistry Interface Processor (MCIP) for the CMAQ modeling system: updates through MCIPv3.4.1. Geoscientific Model Development, 3, 243-256.
DOI for CMAQv5.3: https://doi.org/10.5281/zenodo.3379043 (which includes MCIPv5.0).
Background on MCIP and other useful information about the CMAQ system can be found online at http://www.epa.gov/cmaq.
Inquiries related to potential bugs in MCIPv5.0 or questions related to proper use of the code should be submitted to the MCIP Category in the Forum hosted by the CMAS Center: https://forum.cmascenter.org/c/mcip.
Users are encouraged to read the Frequently Asked Questions (FAQ) file. Users should consult the FAQ and other issues raised within the Forum before submitting new inquiries.