GEOS-Chem v11-03

Overview

History

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

Previous version	This version	Next version
GEOS-Chem v11-02	GEOS-Chem v11-03	TBD
TBD	TBD	TBD
View v11-02 benchmark history	View v11-03 benchmark history	TBD

What's new in this version

NOTE: v11-03a, v11-03b, etc. denote 1-month benchmark simulations, which are designed to evaluate GEOS-Chem's performance at intermediate stages of development.

In the pipeline

Feature	Submitted by	Type	Status
Transport updates
GEOS resolution & subgrid convection	Karen Yu (Harvard)	Science	Delivered to GCST (Oct 2017)
Common set of tracers in GEOS-Chem and GEOS	Transport WG GCST	Benchmarking
Chemistry updates
Updated chlorine chemistry	Xuan Wang (Harvard)	Science
Emissions updates
Grid-independent emissions, including: Lightning NOx emissions (3-hourly) Dust emissions (hourly) Biogenic and sea salt emissions (hourly)	Randall Martin (Dalhousie) Lee Murray (Rochester) David Ridley (MIT) Jintai Lin (PKU)	Science
Ocean ammonia emission inventory	Fabien Paulot (NOAA/GFDL)	Science	Data files delivered to GCST (Jan 2016) Needs to be implemented via HEMCO
A snow NOx source from deep snowpack	Maria Zatko (UW) Becky Alexander (UW)	Science	Delivered to GCST (Nov 2017) Implemented in v9-01-01 Needs to be added as a HEMCO extension
MASAGE inventory in HEMCO as default	Fabien Paulot (NOAA/GFDL) Amos Tai (CUHK)	Science
Non-agricultural NH3 for use with MASAGE	Amos Tai (CUHK)	Science
Radon emission update	Bo Zhang (NIA/NASA Langley)	Science	Delivered to GCST (Nov 2017) Implementation pending paper submission
GFAS biomass burning emissions	Mat Evans (York)	Science
Deposition/surface updates
Wet scavenging in mixed-phase clouds	Bo Zhang (NIA/NASA Langley)	Science	Delivered to GCST (Nov 2017) Only applied/tested for Pb Implementation pending paper submission
Harmonizing Henry's Law coefficients across wet and dry deposition	GCST	Science
Sedimentation of stratospheric aerosols	Sebastian Eastham (Harvard)	Science
Aerosol updates
Sea salt aerosol alkalinity	Qianjie Chen (UW) Becky Alexander (UW) Xuan Wang (Harvard)	Science	UW version delivered to GCST (Nov 2017)
VBS SOA option	Rokjin Park (SNU)	Science
Specialty simulation updates
Oxidant fields from v10 for 2006-2012 3D chemical source for CO2, CO OH for tagged CO & CH4	Dylan Jones (UofT)	Science	Will make data files available on ftp site
Year 2010 ocean Hg boundary conditions from ocean model	Hannah Horowitz (Harvard)	Science
Historical products emissions from Zhang et al. (2016), should become default	Colin Thackray (Harvard)	Science
AMAP/UNEP 2035 for Hg simulation	Helene Angot (MIT)	Science
Africa nested-grid for GEOS-FP and MERRA-2	Eloise Marais (U. Birmingham)	Science	Delivered to GCST (Dec 2017)
West Africa nested-grid for GEOS-FP	Mat Evans (York) Eleanor Morris (York)	Science
Tagged sulfate simulation	Becky Alexander (UW)	Science
Arsenic simulation	Shiliang Wu (MT)	Science
Structural updates
Updated flux diagnostics	Chris Holmes (Florida State) GCST	Structural/ Benchmarking
Additional modifications for FlexChem, including: Rebuild the pre-built chemistry mechanisms (Standard, Tropchem, UCX, SOA, SOA-SVPOA) with Kppa Add capability for custom chemistry mechanism by building KPP on-the-fly in GEOS-Chem	Mike Long (Harvard) GCST	Structural
Benchmark of stratospheric simulation	Dylan Jones (U. Toronto)	Benchmarking	1-yr benchmarks for GEOS-Chem v11-01d and later include comparisons with OSIRIS O3 Waiting on OSIRIS NO2 data Waiting on comparisons with ACE-FTS data
Uniformity of units	GCST	Structural	Phase 2 (unit uniformity throughout chemistry) to be implemented after Flexchem Phase 3 (unit uniformity in some specialty simulations) will be implemented in pieces with input from 3rd party developers Phase 4 (removal of area and area-dependent State_Met variables) will be ongoing
ObsPack diagnostic as netCDF replacement for planeflight_mod.F	Andy Jacobson (NOAA/ESRL)	Structural	Delivered to GCST (May 2017)
NetCDF Output Phase 3b: Updates to eliminate differences between single and multi-segmented GEOS-Chem runs	GCST Christoph Keller	Bug fix/Structural
Expansion of model capabilities
FlexGrid: Use HEMCO to read met fields and enable nested simulations over any custom domains	Jiawei Zhuang (Harvard) Jintai Lin (PKU)	Structural	Delivered to GCST (Oct 2016)
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)
Archival of roughness length for temperature z0T	GCST	Met processing

New data directories

The following HEMCO data directories have been added or updated for GEOS-Chem v11-02. You will have to download the directories relevant to your simulation.

Inventory	What was added?	When added?	Directory

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 v11-03 benchmark history wiki page.

Unit tests for GEOS-Chem v11-03

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

Previous issues now resolved in GEOS-Chem v11-03

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

Outstanding issues not yet resolved in GEOS-Chem v11-03

TBD