Grid-independent emissions: Difference between revisions

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<span style="color:green">'''''These emissions were be implemented in [[GEOS-Chem 12#12.4.0|GEOS-Chem 12.4.0]].'''''</span>
== Overview ==
== Overview ==
The grid-independent emissions were identified as a priority during the development of [[GCHP Main Page|GCHP]], which uses cubed-sphere grids instead of the traditional lat-lon grids used by GEOS-Chem "Classic". As such, emissions that utilized resolution-dependent scale factors (e.g. dust and lightning) posed a challenge. The solution was to use grid-independent emissions saved out at high-resolution that would be regridded to the simulation grid at run time via HEMCO.
The grid-independent (aka offline) emissions were implemented in [[GEOS-Chem 12#12.5.0|GEOS-Chem 12.5.0]]. They are available at 0.25&deg; x 0.3125&deg; and 0.5&deg; x 0.625&deg;, which correspond to the native horizontal resolution of the [[GEOS-FP]] and [[MERRA-2]] meteorology fields used to drive GEOS-Chem. The offline emissions were generated by running the [[HEMCO standalone]] with the analogous online emissions (or [[The_HEMCO_User%27s_Guide#Extensions|HEMCO extension]]) turned on.
*[[#Dust emissions|Offline dust emissions]] were generated with the [[Mineral_dust_aerosols|DustDead extension]]
*[[#Biogenic VOC emissions|Offline biogenic VOC emissions]] were generated with the [[MEGAN_v2.1_plus_Guenther_2012_biogenic_emissions|MEGAN extension]]
*[[#Sea salt emissions|Offline sea salt emissions]] were generated with [[Sea_salt_aerosols#SST_dependent_sea_salt_emissions|SeaSalt extension]]
*[[#Soil NOx emissions|Offline soil NOx emissions]] were generated with the [[Hudman_et_al_2012_soil_NOx_emissions_algorithm|SoilNOx extension]]
'''''<span style="color:red">By default, these offline emissions are turned on. To use the online emissions instead, set the offline emissions (OFFLINE_DUST, OFFLINE_BIOGENICVOC, OFFLINE_SEASALT, and/or OFFLINE_SOILNOX) to <tt>false</tt> at the top of HEMCO_Config.rc and set the corresponding HEMCO extension (DustDead, MEGAN, SeaSalt, and/or SoilNOx) to <tt>on</tt>.'''''</span>
== Download ==
The grid-independent emissions are stored on at the WashU data portal and may be accessed at the following address:
  http://geoschemdata.wustl.edu
A copy of the grid-independent emissions may be found on the Harvard and Dalhousie data archives, but they are not guaranteed to be up-to-date or contain all years available.


== Dust emissions ==
== Dust emissions ==


<span style="color:darkorange">'''''This update will be included in [[GEOS-Chem 12#12.4.0|GEOS-Chem 12.4.0]].'''''</span>
'''Developers:''' David Ridley (CARB, formerly MIT), Jun Meng (Dalhousie)


'''Developers:''' David Ridley (CARB, formerly MIT), Jun Meng (Dalhousie)
'''README''': http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_DUST/v2021-08/README
 
Please see [[Mineral_dust_aerosols#Offline_Dust_Emissions|this post on the ''Mineral Dust Aerosols'' wiki page]] for a details about the offline dust emissions.
 
== Lightning NOx emissions ==
 
'''Developer:''' Lee Murray (Rochester)
 
'''README''': http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_LIGHTNING/v2020-03/GEOSFP/README
 
== Biogenic VOC emissions ==


'''''Dave Ridley wrote:'''''
'''Developer:''' Jintai Lin (PKU) and Hongjian Weng (PKU)


<blockquote>The method that I’ve settled on is relatively simple and doesn’t require too many code alterations. Here is a link to the standalone code, a README (in /standalone/), the code files with the key changes and a diff patch from v11-01:
'''README''': http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_BIOVOC/v2021-12/README.txt
https://www.dropbox.com/sh/nmx7qhm5tlpt0aa/AAAF_-M1DBOVO1hwetpefd1wa?dl=0


There are a few points that need ironing out:
Grid-independent offline biogenic VOC emissions are now available for GEOS-Chem at native MERRA-2 (0.5° x 0.625°) and GEOS-FP (0.25° x 0.3125°) meteorology field resolution. The emissions used in [[GEOS-Chem 12#12.5.0|GEOS-Chem 12.5.0]] and later were generated with GEOS-Chem 12.3.0 using the Yuan-processed MODIS XLAI.


Because of how HEMCO_sa_Grid.rc wants a grid x and y to be listed on a single line, this becomes an issue within the HEMCO code for the maximum allowable line length. I went through and changed all occurrences of these to prevent crashing when listing the 0.5 x 625 grid points, but now it means that every line in the HEMCO log file is very long, making the file big and a mess to read. So there is definitely a better solution I’m sure (either how the grid is read into HEMCO or trimming the blankspace on lines written to the log file), but that is the source of all the changes in the HEMCO/Core files that you’ll see in the diff patch.
=== Fixes for biogenic SOAP, SOAS, and CO emissions ===


Alterations made to Makefile_header and CMN_SIZE_mod so that compilation will run far enough with GRID=0.5x0.625 MET=merra2 so that hemco_standalone.x is generated and dust emissions can be calculated at this resolution. Ideally need to extend this to GEOS-FP 0.25 x 0.3125 capability. I’ve not done this yet.
<span style="color:green">'''''This fix was included in [[GEOS-Chem 12#12.5.0|GEOS-Chem 12.5.0]], which was released on 09 Sep 2019.'''''</span>


Currently the scaling factor is 1.0 for the dust when pre-processor switches MERRA-2 and 0.5x0.625 are on, i.e. when HEMCO standalone is calculating offline emissions. Then the scaling factor is applied to the offline emissions when read in, by the 606 scale factor in HEMCO_Config.rc. This means that the scale factors should be unchanged when running dust online. There may be a better way of doing this that is consistent for online and offline dust emissions.
The 1-month benchmark for [[GEOS-Chem 12#12.5.0|GEOS-Chem 12.5.0]] revealed some issues with the SOAP, SOAS, and CO emissions in the updated offline biogenic VOC emissions (in <tt>OFFLINE_BIOVOC/v2019-08/</tt>. To resolve the issues, SOAP and SOAS emissions from those files are ignored, and we instead compute those emissions directly from isoprene and monoterpene emissions.


A random wetscav (potential) bug fixed with old NSOL reference changes. I’m not sure if it actually makes a difference, just for consistency if I’m correct.
0 BIOGENIC_ISOP      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc ISOP_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s ISOP -  4 2
<span style="color:green">0 BIOGENIC_ISOP_SOAP -                                                                                            -            -                        - -  -        SOAP 610 4 2
0 BIOGENIC_ISOP_SOAS -                                                                                            -            -                        - -  -        SOAS 610 4 2</span>
0 BIOGENIC_LIMO      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc LIMO_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s LIMO -  4 2
<span style="color:green">0 BIOGENIC_LIMO_SOAP -                                                                                            -            -                        - -  -        SOAP 611 4 2
0 BIOGENIC_LIMO_SOAS -                                                                                            -            -                        - -  -        SOAS 611 4 2</span>
0 BIOGENIC_MTPA      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc MTPA_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s MTPA -  4 2
<span style="color:green">0 BIOGENIC_MTPA_SOAP -                                                                                            -            -                        - -  -        SOAP 611 4 2
0 BIOGENIC_MTPA_SOAS -                                                                                            -            -                        - -  -        SOAS 611 4 2</span>
0 BIOGENIC_MTPO      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc MTPO_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s MTPO -  4 2
<span style="color:green">0 BIOGENIC_MTPO_SOAP -                                                                                            -            -                        - -  -        SOAP 611 4 2
0 BIOGENIC_MTPO_SOAS -                                                                                            -            -                        - -  -        SOAS 611 4  2</span>
0 BIOGENIC_SESQ      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc SESQ_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s SESQ -  4 2
<span style="color:green">0 BIOGENIC_SESQ_SOAP -                                                                                            -            -                        - -  -        SOAP 612 4 2
0 BIOGENIC_SESQ_SOAS -                                                                                            -            -                        - -  -        SOAS 612 4 2
#==============================================================================
# --- Offline biogenic VOC scale factors ---
#
# Isoprene      : 1.5% mass yield SOAP, 1.5% mass yield SOAS
# Monoterpenes  : 5.0% mass yield SOAP, 5.0% mass yield SOAS
# Other terpenes: 5.0% mass yield SOAP, 5.0% mass yield SOAS
#  --> Need to multiply by 1.133 to convert from carbon basis to mass basis
#==============================================================================
610 ISOPtoSOA 0.0170 - - - xy 1 1
611 MONOtoSOA 0.0567 - - - xy 1 1
612 OTHRtoSOA 0.0567 - - - xy 1 1</span>


I think those are the main points.  
In addition, the offline [[MEGAN_v2.1_plus_Guenther_2012_biogenic_emissions#Remove_biogenic_CO_emissions_to_avoid_double_counting|biogenic CO emissions are not used to avoid double counting]].


Once the model has run again I can send over some details of the analysis, or at least add them to a wiki. The initial testing shows a <1% change in emissions when running offline at 2x2.5 vs online at 2x2.5, which is good! Using the 0.5x0.625 emissions increases the global dust emission by ~40-50%. The analysis will indicate when and where this happens, improvement relative to observations and the scaling factor that should be set in HEMCO_Config (currently defaulting to 0.0004).</blockquote>
=== Apply temporary scaling to biogenic VOC emissions in 12.4.0 ===


--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 12:58, 7 December 2018 (UTC)
The offline biogenic VOC emissions implemented in [[GEOS-Chem 12#12.4.0|GEOS-Chem 12.4.0]] and found in [http://ftp.as.harvard.edu/gcgrid/data/ExtData/HEMCO/OFFLINE_BIOVOC/v2019-01/ <tt>HEMCO/OFFLINE_BIOVOC/v2019-01</tt>] were generated using [[GEOS-Chem v11-02]]. The following updates and fixes had been applied to MEGAN since v11-02:


== Lightning NOx emissions ==
*[[MEGAN_v2.1_plus_Guenther_2012_biogenic_emissions#Updated_PFT_file|Update to a new plant functional type (PFT) file created from higher resolution data]] (added in 12.3.0)
*[[Implementation_of_HEMCO_in_GEOS-Chem#Bug_fix:_Read_data_with_the_.22E.22_cycle_flag_just_once|HEMCO bug fix to prevent excessive attempts to read the HEMCO restart file when using GEOS-Chem "Classic"]] (added in 12.1.0)


<span style="color:darkorange">'''''This update will be included in [[GEOS-Chem 12#12.4.0|GEOS-Chem 12.4.0]].'''''</span>
Jintai Lin's group is going to regenerate the offline biogenic VOC emissions with the latest version of the model, but as a temporary fix we are going to scale the annual biogenic VOC emission totals to those in 12.3.0. The scale factors were generated by running the [[HEMCO standalone]] using online MEGAN emissions and offline biogenic VOC emissions for one year (2016).


'''Developer:''' Lee Murray (Rochester)
        geosfp_4x5_MEGAN  geosfp_2x25_MEGAN  geosfp_4x5_OfflineBioVOC  Scale Factors
ACET 25.05267 Tg      24.37869 Tg        26.95496 Tg              0.9294271416
ALD2 9.882695 Tg      9.772552 Tg        8.402392 Tg              1.176176379
C2H4 21.87993 Tg      21.54709 Tg        16.22218 Tg              1.348766171
EOH 9.450429 Tg      9.345103 Tg        8.034874 Tg              1.176176378
ISOP 355.8949 Tg      364.0299 Tg        233.8795 Tg              1.521701941
PRPE 19.95450 Tg      19.46565 Tg        18.49293 Tg              1.079034029
SOAP 0.484302 Tg      0.495372 Tg        0.067689 Tg              7.154810974
SOAS 0.484302 Tg      0.495372 Tg        0.067689 Tg              7.154810974


== Biogenic emissions ==
The following changes need to be included in HEMCO_Config.rc if you're using this version of the offline biogenic VOC emissions.


<span style="color:darkorange">'''''This update will be included in [[GEOS-Chem 12#12.4.0|GEOS-Chem 12.4.0]].'''''</span>
#==============================================================================
# --- Offline biogenic VOC emissions ---
#==============================================================================
0 BIOGENIC_ACET $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc ACET_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s ACET <span style="color:green">610</span> 4 2
0 BIOGENIC_ALD2 $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc ALD2_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s ALD2 <span style="color:green">611</span> 4 2
0 BIOGENIC_C2H4 $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc C2H4_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s C2H4 <span style="color:green">612</span> 4 2
0 BIOGENIC_EOH  $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc EOH_MEGAN  1980-2017/1-12/1-31/0-23 C xy kgC/m2/s EOH  <span style="color:green">613</span> 4 2
0 BIOGENIC_ISOP $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc ISOP_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s ISOP <span style="color:green">614</span> 4 2
0 BIOGENIC_PRPE $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc PRPE_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s PRPE <span style="color:green">615</span> 4 2
0 BIOGENIC_SOAP $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc SOAP_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s SOAP <span style="color:green">616</span> 4 2
0 BIOGENIC_SOAS $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc SOAS_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s SOAS <span style="color:green">616</span> 4 2
...
<span style="color:green">610 ACET_SF 0.929 - - - xy 1 1
611 ALD2_SF 1.176 - - - xy 1 1
612 C2H4_SF 1.349 - - - xy 1 1
613 EOH_SF  1.176 - - - xy 1 1
614 ISOP_SF 1.522 - - - xy 1 1
615 PRPE_SF 1.079 - - - xy 1 1
616 SOA_SF  7.155 - - - xy 1 1</span>


'''Developer:''' Jintai Lin (PKU) and Hongjian Meng (PKU)
--[[User:Melissa Payer|Melissa Sulprizio]] ([[User talk:Melissa Payer|talk]]) 16:07, 18 June 2019 (UTC)


== Sea salt emissions ==
== Sea salt emissions ==


<span style="color:darkorange">'''''This update will be included in [[GEOS-Chem 12#12.4.0|GEOS-Chem 12.4.0]].'''''</span>
'''Developer:''' Jintai Lin (PKU) and Hongjian Weng (PKU)


'''Developer:''' Jintai Lin (PKU) and Hongjian Meng (PKU)
'''README''': http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_SEASALT/v2019-01/README


== Soil NOx emissions ==
== Soil NOx emissions ==


<span style="color:darkorange">'''''This update will be included in [[GEOS-Chem 12#12.4.0|GEOS-Chem 12.4.0]].'''''</span>
'''Developer:''' Jintai Lin (PKU) and Hongjian Weng (PKU)


'''Developer:''' Jintai Lin (PKU) and Hongjian Meng (PKU)
'''README''': http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_SOILNOX/v2021-12/README.txt

Latest revision as of 14:50, 20 September 2022

These emissions were be implemented in GEOS-Chem 12.4.0.

Overview

The grid-independent emissions were identified as a priority during the development of GCHP, which uses cubed-sphere grids instead of the traditional lat-lon grids used by GEOS-Chem "Classic". As such, emissions that utilized resolution-dependent scale factors (e.g. dust and lightning) posed a challenge. The solution was to use grid-independent emissions saved out at high-resolution that would be regridded to the simulation grid at run time via HEMCO.

The grid-independent (aka offline) emissions were implemented in GEOS-Chem 12.5.0. They are available at 0.25° x 0.3125° and 0.5° x 0.625°, which correspond to the native horizontal resolution of the GEOS-FP and MERRA-2 meteorology fields used to drive GEOS-Chem. The offline emissions were generated by running the HEMCO standalone with the analogous online emissions (or HEMCO extension) turned on.

By default, these offline emissions are turned on. To use the online emissions instead, set the offline emissions (OFFLINE_DUST, OFFLINE_BIOGENICVOC, OFFLINE_SEASALT, and/or OFFLINE_SOILNOX) to false at the top of HEMCO_Config.rc and set the corresponding HEMCO extension (DustDead, MEGAN, SeaSalt, and/or SoilNOx) to on.

Download

The grid-independent emissions are stored on at the WashU data portal and may be accessed at the following address: 

 http://geoschemdata.wustl.edu

A copy of the grid-independent emissions may be found on the Harvard and Dalhousie data archives, but they are not guaranteed to be up-to-date or contain all years available.

Dust emissions

Developers: David Ridley (CARB, formerly MIT), Jun Meng (Dalhousie)

README: http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_DUST/v2021-08/README

Please see this post on the Mineral Dust Aerosols wiki page for a details about the offline dust emissions.

Lightning NOx emissions

Developer: Lee Murray (Rochester)

README: http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_LIGHTNING/v2020-03/GEOSFP/README

Biogenic VOC emissions

Developer: Jintai Lin (PKU) and Hongjian Weng (PKU)

README: http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_BIOVOC/v2021-12/README.txt

Grid-independent offline biogenic VOC emissions are now available for GEOS-Chem at native MERRA-2 (0.5° x 0.625°) and GEOS-FP (0.25° x 0.3125°) meteorology field resolution. The emissions used in GEOS-Chem 12.5.0 and later were generated with GEOS-Chem 12.3.0 using the Yuan-processed MODIS XLAI.

Fixes for biogenic SOAP, SOAS, and CO emissions

This fix was included in GEOS-Chem 12.5.0, which was released on 09 Sep 2019.

The 1-month benchmark for GEOS-Chem 12.5.0 revealed some issues with the SOAP, SOAS, and CO emissions in the updated offline biogenic VOC emissions (in OFFLINE_BIOVOC/v2019-08/. To resolve the issues, SOAP and SOAS emissions from those files are ignored, and we instead compute those emissions directly from isoprene and monoterpene emissions. 

0 BIOGENIC_ISOP      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc ISOP_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s ISOP -   4 2
0 BIOGENIC_ISOP_SOAP -                                                                                            -             -                        - -  -        SOAP 610 4 2
0 BIOGENIC_ISOP_SOAS -                                                                                            -             -                        - -  -        SOAS 610 4 2
0 BIOGENIC_LIMO      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc LIMO_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s LIMO -   4 2
0 BIOGENIC_LIMO_SOAP -                                                                                            -             -                        - -  -        SOAP 611 4 2
0 BIOGENIC_LIMO_SOAS -                                                                                            -             -                        - -  -        SOAS 611 4 2
0 BIOGENIC_MTPA      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc MTPA_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s MTPA -   4 2
0 BIOGENIC_MTPA_SOAP -                                                                                            -             -                        - -  -        SOAP 611 4 2
0 BIOGENIC_MTPA_SOAS -                                                                                            -             -                        - -  -        SOAS 611 4 2
0 BIOGENIC_MTPO      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc MTPO_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s MTPO -   4 2
0 BIOGENIC_MTPO_SOAP -                                                                                            -             -                        - -  -        SOAP 611 4 2
0 BIOGENIC_MTPO_SOAS -                                                                                            -             -                        - -  -        SOAS 611 4  2
0 BIOGENIC_SESQ      $ROOT/OFFLINE_BIOVOC/v2019-08/{NATIVE_RES}/$YYYY/$MM/biovoc_{LATRES}x{LONRES}.$YYYY$MM$DD.nc SESQ_MEGAN    1980-2017/1-12/1-31/0-23 C xy kgC/m2/s SESQ -   4 2 
0 BIOGENIC_SESQ_SOAP -                                                                                            -             -                        - -  -        SOAP 612 4 2
0 BIOGENIC_SESQ_SOAS -                                                                                            -             -                        - -  -        SOAS 612 4 2

#==============================================================================
# --- Offline biogenic VOC scale factors ---
#
# Isoprene      : 1.5% mass yield SOAP, 1.5% mass yield SOAS
# Monoterpenes  : 5.0% mass yield SOAP, 5.0% mass yield SOAS
# Other terpenes: 5.0% mass yield SOAP, 5.0% mass yield SOAS
#  --> Need to multiply by 1.133 to convert from carbon basis to mass basis
#==============================================================================
610 ISOPtoSOA 0.0170 - - - xy 1 1
611 MONOtoSOA 0.0567 - - - xy 1 1
612 OTHRtoSOA 0.0567 - - - xy 1 1

In addition, the offline biogenic CO emissions are not used to avoid double counting.

Apply temporary scaling to biogenic VOC emissions in 12.4.0

The offline biogenic VOC emissions implemented in GEOS-Chem 12.4.0 and found in HEMCO/OFFLINE_BIOVOC/v2019-01 were generated using GEOS-Chem v11-02. The following updates and fixes had been applied to MEGAN since v11-02:

Jintai Lin's group is going to regenerate the offline biogenic VOC emissions with the latest version of the model, but as a temporary fix we are going to scale the annual biogenic VOC emission totals to those in 12.3.0. The scale factors were generated by running the HEMCO standalone using online MEGAN emissions and offline biogenic VOC emissions for one year (2016). 

        geosfp_4x5_MEGAN  geosfp_2x25_MEGAN  geosfp_4x5_OfflineBioVOC  Scale Factors
ACET	25.05267 Tg       24.37869 Tg        26.95496 Tg               0.9294271416
ALD2	9.882695 Tg       9.772552 Tg        8.402392 Tg               1.176176379
C2H4	21.87993 Tg       21.54709 Tg        16.22218 Tg               1.348766171
EOH	9.450429 Tg       9.345103 Tg        8.034874 Tg               1.176176378
ISOP	355.8949 Tg       364.0299 Tg        233.8795 Tg               1.521701941
PRPE	19.95450 Tg       19.46565 Tg        18.49293 Tg               1.079034029
SOAP	0.484302 Tg       0.495372 Tg        0.067689 Tg               7.154810974
SOAS	0.484302 Tg       0.495372 Tg        0.067689 Tg               7.154810974

The following changes need to be included in HEMCO_Config.rc if you're using this version of the offline biogenic VOC emissions. 

#==============================================================================
# --- Offline biogenic VOC emissions ---
#==============================================================================
0 BIOGENIC_ACET $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc ACET_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s ACET 610 4 2
0 BIOGENIC_ALD2 $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc ALD2_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s ALD2 611 4 2
0 BIOGENIC_C2H4 $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc C2H4_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s C2H4 612 4 2
0 BIOGENIC_EOH  $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc EOH_MEGAN  1980-2017/1-12/1-31/0-23 C xy kgC/m2/s EOH  613 4 2
0 BIOGENIC_ISOP $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc ISOP_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s ISOP 614 4 2
0 BIOGENIC_PRPE $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc PRPE_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s PRPE 615 4 2
0 BIOGENIC_SOAP $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc SOAP_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s SOAP 616 4 2
0 BIOGENIC_SOAS $ROOT/OFFLINE_BIOVOC/v2019-01/0.25x0.3125/$YYYY/$MM/biovoc_025.$YYYY$MM$DD.nc SOAS_MEGAN 1980-2017/1-12/1-31/0-23 C xy kgC/m2/s SOAS 616 4 2

...

610 ACET_SF 0.929 - - - xy 1 1
611 ALD2_SF 1.176 - - - xy 1 1
612 C2H4_SF 1.349 - - - xy 1 1
613 EOH_SF  1.176 - - - xy 1 1
614 ISOP_SF 1.522 - - - xy 1 1
615 PRPE_SF 1.079 - - - xy 1 1
616 SOA_SF  7.155 - - - xy 1 1

--Melissa Sulprizio (talk) 16:07, 18 June 2019 (UTC)

Sea salt emissions

Developer: Jintai Lin (PKU) and Hongjian Weng (PKU)

README: http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_SEASALT/v2019-01/README

Soil NOx emissions

Developer: Jintai Lin (PKU) and Hongjian Weng (PKU)

README: http://geoschemdata.wustl.edu/ExtData/HEMCO/OFFLINE_SOILNOX/v2021-12/README.txt

Retrieved from "https://wiki.seas.harvard.edu/geos-chem/index.php?title=Grid-independent_emissions&oldid=51608"