GEOS-Chem 12

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GEOS-Chem v11-02-final will also carry the designation GEOS-Chem 12.0.0. We are migrating to a purely numeric versioning system in order to adhere more closely to software development best practices. For a complete description of the new versioning system, please see our GEOS-Chem version numbering system wiki page.




Version history

The table below shows the previous, current, and successive major GEOS-Chem versions:

Previous major release Current release candidate Pending major release Next stable version Successive major release
GEOS-Chem v11-01-public v11-02-release-candidate
(aka v11-02-rc)
GEOS-Chem 12.0.0
aka v11-02-final in the
old version number system
GEOS-Chem 12.1.0 GEOS-Chem 13.0.0
RELEASED 01 Feb 2017 RELEASED 22 Jun 2018 RELEASE TBD RELEASE TBD RELEASE TBD 2019
GC v11-01 online manual GC v11-02 benchmark history GC 12 online manual GC 12 benchmark history


The sections below describe each GEOS-Chem feature version and GEOS-Chem patch version belonging to the GEOS-Chem 12 series. Each feature version carries the tag 12.Y.0, which indicates that the version will be (or has been) validated with a 1-month benchmark simulation (and one or more 1-year benchmark simulations if necessary). Each patch version carries the tag 12.Y.Z, which denotes that the version preserves backwards-compatibility with the prior feature version 12.Y.0. For more information, please see our GEOS-Chem version numbering system wiki page.

In the pipeline

Several GEOS-Chem updates have been proposed by the relevant Working Groups, but have not yet been assigned to a specific GEOS-Chem version. For a complete list of these updates, please visit our GEOS-Chem model development priorities wiki page.

12.3.0

The items listed below are slated to be included in GEOS-Chem 12.3.0. This is a feature release which will be validated with a 1-month benchmark simulation.

Feature Submitted by Type Status
Features affecting the full-chemistry simulation:
Update ISORROPIA from v2.0 to v2.2, in order to remove persistent noise in output Seb Eastham (Harvard) Science
  • Delivered to GCST (May 2017)
Update MODIS LAI fields for 2005-2016 using Yuan et al. (2011) Jenny Fisher (Wollongong)
Barron Henderson (US EPA)
Science
  • Will require reworking of LAI regridding in GEOS-Chem Classic and pre-processing land map data
Extend UCX into the mesosphere Sebastian Eastham (MIT) Science
OMI-based Volcanic emissions 2005-2012 Cui Ge (U. Iowa)
Jun Wang (U. Iowa)
Science
  • Working with developers to obtain alternate data for Oct-Dec 2012.

12.2.0

The items listed below are slated to be included in GEOS-Chem 12.2.0. This is a feature release which will be benchmarked with a 1-month benchmark simulation and a 1-year Rn-Pb-Be benchmark simulation.

Feature Submitted by Type Status
Features NOT affecting the full-chemistry simulation:
Common set of tracers in GEOS-Chem and GEOS Transport WG
GCST
Benchmarking
  • A set of passive species will be added to the GEOS-Chem Rn-Pb-Be benchmark simulation. This will facilitate comparisons between GEOS-Chem "Classic" and/or GCHP vs. the NASA GEOS-DAS system.

12.1.0

The items listed below are slated to be included in GEOS-Chem 12.1.0. This is a feature release which will be validated with a 1-month benchmark simulation.

Feature Submitted by Type Status
Features affecting the full-chemistry simulation:
FlexGrid: Use HEMCO to read met fields and enable nested simulations over any custom domains Jiawei Zhuang (Harvard)
Jintai Lin (PKU)
Structural
  • NOTE: FlexGrid might result in slight differences in met fields w/r/t the current regridding method. This could have an impact on the full-chemistry simulations.
Anthropogenic PM2.5 dust source Sajeev Philip (Dalhousie) Science
  • Update 29 Jun 2018: Fixed an initialization issue that caused much more dust to be emitted than the expected 13.1 Tg/yr.
  • Code updates have been added to GC git repository, but are commented out until we officially release this feature in 12.1.0.
NetCDF Output Phase 3b: Updates to eliminate differences between single and multi-segmented GEOS-Chem runs GCST
Christoph Keller
Bug Fix &
Structural
Features NOT affecting the full-chemistry simulation:
Updated flux diagnostics Chris Holmes (Florida State)
GCST
Structural/
Benchmarking

12.0.0



GEOS-Chem v11-02-final will also carry the designation GEOS-Chem 12.0.0. We are migrating to a purely numeric versioning system in order to adhere more closely to software development best practices. For a complete description of the new versioning system, please see our GEOS-Chem version numbering system wiki page.




The following updates and fixes are slated to be added to GEOS-Chem 12.0.0 (aka v11-02-final). Many of these updates fix issues that were identified during the GEOS-Chem v11-02 "release candidate" testing period.

Feature Submitted by Type Status
Features affecting the full-chemistry simulation:
Grid offset bug fix in high-resolution MEGAN files at southern mid-latitudes Jenny Fisher (Wollongong)
Dylan Millet (UMN)
Bug fix New files received
Run directory updates not yet applied
Bug fix in FlexChem: do not zero out ACTA, EOH, HCOOH concentrations Katie Holmes Bug Fix Implemented 27 Jun 2018
  • NOTE: This update only produced very small differences w/r/t v11-02-rc:
    • Mean OH decreased by 0.083 %
    • MCF lifefime increased by 0.112 %
    • CH4 lifetime increased by 0.112 %
    • O3 STE flux decreased by 0.011 %
Add GFED4.1 data for 2015 and 2016; Use GFED4.1 2016 in benchmarks Kate O'Dell (CSU)
GCST
Science In progress
Features NOT affecting the full-chemistry simulation:
Bug fixes for v11-02 simulations using the RRTMG radiative transfer model Chris Holmes (U. Florida) Bug Fix Implemented 26 Jun 2018
  • NOTE: This only affects the RRTMG simulations. Full-chemistry difference-tests yielded identical results w/r/t v11-02-rc.
Now always declare the netCDF time variable with an unlimited dimension Chris Holmes (U. Florida) Structural Implemented 26 Jun 2018
  • NOTE: Full-chemistry difference-tests yielded identical results w/r/t v11-02-rc.
Bug fix for HEMCO soil NOx error with ifort 17 Jenny Fisher (U. Wollongong) Structural Implemented 26 Jun 2018
  • NOTE: Full-chemistry difference-tests yielded identical results w/r/t v11-02-rc.
Update to HEMCO v2.1.006, which adds several minor updates Christoph Keller (NASA/GMAO) Structural Implemented 27 Jun 2018
  • NOTE: These updates only affect the CH4 simulation. Full-chemistry difference-tests yielded identical results w/r/t v11-02-rc.
Make two-way nesting option compatible with GEOS-Chem v11-02 code Yingying Yan (PKU)
Jintai Lin (PKU)
Bug Fix Awaiting code from developer
Bug fix for ARCTAS_SHIP in HEMCO_Config.rc file Barron Henderson (EPA) Bug Fix A minor edit to HEMCO_Config.rc is necessary. This will likely change the benchmark results, so validation will be necessary.

--Bob Yantosca (talk) 14:31, 21 June 2018 (UTC)

New data directories

The following HEMCO data directories have been added or updated for GEOS-Chem 12. You will have to download the directories relevant to your simulation.

Inventory What was added? When added? Directory
TBD

Validation

In this section we provide information about the benchmarks and tests that we have done to validate GEOS-Chem v11-03.

1-month and 1-year benchmarks

For complete information about the benchmark simulations used to validate GEOS-Chem v11-03, please see our GEOS-Chem 12 benchmark history wiki page.

Unit tests for GEOS-Chem 12

We perform a full set of unit tests on GEOS-Chem on an almost daily basis. These tests ensure that each new feature being added does not break any existing functionality.

Here are the unit tests that we ran before submitting 1-month benchmark simulation for v11-03. Click on the links below to see the results from each set of unit tests:

Unit test Date
TBD

Previous issues now resolved in GEOS-Chem 12

The following bugs and/or technical issues have been resolved in v11-03.

Outstanding issues not yet resolved in GEOS-Chem 12

The following known issues are slated to be fixed in GEOS-Chem 12:

Disable Xiao propane emissions to avoid double-counting with CEDS

This update is currently slated for GEOS-Chem 12.0.0

Lizzie Lundgren wrote:

I am turning off the XIAO inventory in v11-02 but just noticed Daniel said "for propane" while Christoph said to turn off the entire inventory. Christoph pointed out this would avoid double-counting C2H6 since we also get it from Tzompa-Sosa et al. (2017)

Christoph Keller wrote:

I should have been more specific: in the current configuration, XIAO emissions are only used for propane. For ethane, the Tzompa-Sosa emissions always have priority over XIAO (hierarchy of 1000 vs. 5) and XIAO ethane emissions are thus ignored. The problem with propane is that CEDS and XIAO have the same hierarchy (=5) and the emissions are therefore added. Just disabling XIAO will fix this - and won't have an impact on ethane.

--Bob Yantosca (talk) 18:54, 29 June 2018 (UTC)

Bug fix for HEMCO soil NOx error with ifort 17

This fix will be included in GEOS-Chem 12.0.0.

For complete information about this issue and how it was resolved, please see this post on our Implementation of HEMCO in GEOS-Chem wiki page..

--Bob Yantosca (talk) 13:54, 27 June 2018 (UTC)

FlexChem bug fix: do not zero ACTA, EOH, HCOOH

This fix will be included in GEOS-Chem 12.0.0.

For complete information about this bug and how it was fixed, please see this post on our FlexChem wiki page.

--Bob Yantosca (talk) 14:42, 27 June 2018 (UTC)

Avoid double counting CEDS and GEIA NH3 biofuel emissions

This fix will be included GEOS-Chem 12.

Eloise Marais wrote:

If CEDS includes NH3 emissions, then this will be double counting. I recommend using CEDS, as GEIA is very out of date (1998 according to the HEMCO configuration file I have).

Daniel Jacob replied:

We should use the GEIA NH3 natural emission inventory (1° x 1° file from Eleanor Morris) but not the GEIA NH3 biofuel inventory.

--Bob Yantosca (talk) 16:33, 17 May 2018 (UTC)