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What's New
Rick Pernak edited this page Mar 24, 2020
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5 revisions
RRTMG LW Version | Release Date | Modifications |
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v5.00 | March 2020 | Two new cloud overlap options were added: i) exponential (icld=4 ) and ii) exponential-random (icld=5 ) that apply an exponential transition from maximum to random through model layers. Exponential applies this transition through all layers without regard to the cloud configuration and exponential-random applies this transition through adjacent cloudy layers while randomly correlating cloud layers separated by clear sky. Both methods require calling a new subroutine, get_alpha , to define alpha , the exponential transition parameter, prior to calling the McICA sub-column generator. alpha requires the specification of a decorrelation length (in meters), and two methods for defining this value are available that are selected using a new input control variable, idcor , that allows the decorrelation length to be specified either as a constant or as a value that varies by latitude and day-of-year using the method of Oreopolous et al. (2012). See the file doc/rrtmg_lw_instructions.txt for more information. |
v4.91 | November 2017 | Removed the /src/src_link script that previously linked to the RRTM versions of rrtatm.f and extra.f . Current versions of those files as of this release have been added to this repository in the src directory. The values of MXLAY and MXMOL were also updated to correspond with those now used in rrtatm.f . Removed the src/util_link script that previously linked to the utility files and relocated these to a new aer_rt_utils folder that is tied to ~/RD/AER_RT_UTILS/trunk in the SVN repository as an external. All provided makefiles have been updated to get the utility files from the new directory. |
v4.90 | September 2016 | All source code modules were modified to replace the original copyright statement with a new BSD 3-clause software license (at the request of ECMWF). Additional minor changes include:
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v4.85 | November 2011 | A minor fix has been made to rrtmg_lw_taumol.f90 to the code introduced in v4.82 to correct specparm to read specparm1 at line 1513 in band 7. This change has no impact in moderate to high moisture profiles such as mid-latitude summer and tropical. The largest impact will occur in cold, dry profiles such as mid-latitude winter, or sub-arctic winter. In these profiles, the impact is generally less than 0.05 Wm-2 in flux and less than 0.06 K d-1 in heating rate. Other minor changes were made to improve code compatibility with g95 compilers that have no effect on output. |
v4.84 | November 2009 | An optional feature has been added to the model to provide the vertical profile of the change in upward flux with respect to surface temperature. This option is controlled by a new input flag, idrv . Setting this flag to 1 will output dF/dT for total sky and clear sky in GCM mode in the new output arrays duflx_dt and duflxc_dt . These can be utilized to approximate the change in upward flux for a change in surface temperature only and to derive approximate changes in layer heating rate at time intervals between full radiation calls. This feature should be used in a GCM with some caution, since large changes to only the surface temperature and emission while leaving the atmosphere unchanged will alter the flux divergence and heating in the near surface layers to a degree that may disrupt the GCM simulation. In single column mode, setting idrv to 1 requires the additional input of a dT change in surface temperature relative to the input surface temperature, and the provided dT will be applied to the flux derivative to output a modified upward flux profile for that dT change in surface temperature. Setting idrv to 0 provides the original forward radiative transfer calculation. |
v4.82 | October 2009 | Installed code fix to module rrtmg_lw_taumol.f90 to revise definition and use of the key species ratio parameter (eta ) in some spectral bands. Results are changed in profiles with low water vapor and low temperature. Downward surface fluxes are typically increased by this change by about 0.1 W m-2, with downward flux in some layers increased by as much as 0.5 W m-2 in some profiles. Upward flux changes are smaller. Heating rate changes are generally negligible. There are no changes in flux or heating rate in profiles with moderate to high water vapor such as mid-latitude summer or tropical. |
v4.8 | May 2009 |
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v4.71 | September 2008 | Modified input of ice particle effective size to require input of value appropriate for the selected ice optics parameterization. Previous scaling that was applied internally to convert ice effective radius to generalized effective size for the Fu parameterization has been removed. Any necessary scaling needed to provide the proper ice particle size must be done before input to the radiation in the GCM version of the code. This is consistent with the input requirement for the column version of the model. Note that the internal ice optics parameterizations are effective over specific ranges of particle size. Results may be different from previous versions if the Fu parameterization is used in the GCM version of the code. Also, fixed the definition of the secant of the diffusivity angle, which varies as a function of the water column amount. This change only affects results in profiles with more than eight precipitable cm of water vapor. |
v4.7 | August 2008 | Added requirement that cloud liquid and ice water paths, or optionally the cloud optical depth, be input as in-cloud averages rather than grid-averaged values in the version of the code intended for use in a GCM. This change requires that these cloud properties be scaled by the cloud fraction on input to convert to in-cloud values if necessary. The column model version of the code continues to expect in-cloud values as before. Oxygen amount was changed from being defined internally to a required input. Several other cosmetic modifications do not affect results, but a change in the factor used to convert flux to heating rate from a fixed to a calculated quantity may produce negligible differences in heating rates. |
v4.5 | April 2008 | Added capability to treat longwave aerosol absorption and added use of input file IN_AER_RRTM to read in aerosol optical depths following the application of this file in RRTMG_SW. Aerosol scattering is not presently available in the longwave, so the required input is limited to the aerosol optical depth by layer at the mid-point of each of the 16 spectral bands. |
v4.4 | September 2007 | Modified use of ice particle size variables rei /reicmc to utilize separate variable names (dge /dgesmc ) when units of generalized effective size are required for Fu ice parameterization (iceflag=3 ) option. Results may be minimally affected when ice particle radii exceed 90 microns and the iceflag=3 option is used. Also modified several local arrays in top-level subroutine module to accomodate an extra model layer at the top of the atmosphere if this feature is utilized when using the code in a GCM. |
v4.3 | August 2007 | Includes changes to the makefile for AIX systems and a few minor fixes in the interface for the subroutine version of the model. Results are identical to the previous version. |
v4.1 | August 2007 | Includes several format changes to retain consistency with RRTMG_SW. Results are identical to the previous version. |
v4.0.2 | May 2007 | Made several minor adjustments to kind type suffixes in several modules and made changes to the README file. Results are identical to the previous version. |
v4.0.1 | April 2007 | Includes minor bug fix to the dimension of arrays abscoice and abscoliq in rrtmg_lw_cldprmc.f90 , which affected results on some compilers. |
v4.0 | April 2007 |
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