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Turn off sea salt aerosol debromination by default
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Sea salt aerosol debromination is now disabled via the "Model sea salt Br-"
and "CalcBrSalt" options in HEMCO_Config.rc. The first switch controls
calculation of BrSALA and BrSALC via the Seasalt extension, while the
second controls calculation of BrSALA and BrSALA fluxes by scaling the
offline seasalt emissions for SALA and SALC. Both of these switches are now
set to false by default.

Note: This is how the SSA debromination was deactivated in GEOS-Chem v11-02
through 12.8.2. In GEOS-Chem 12.9.0, the "Model sea salt Br-" was switched
to true as part of the halogen updates from Xuan Wang.

This change comes out of concern over the GEOS-Chem 13.4.0-rc.2 benchmarks
where ozone concentrations were too low, especially over the Southern Ocean.
See Github issue #1145 for more details.

Signed-off-by: Melissa Sulprizio <mpayer@seas.harvard.edu>
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msulprizio committed Mar 16, 2022
1 parent 95fedc3 commit 2c01f46
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Showing 5 changed files with 24 additions and 4 deletions.
7 changes: 6 additions & 1 deletion run/CESM/HEMCO_Config.rc
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Original file line number Diff line number Diff line change
Expand Up @@ -113,6 +113,7 @@ Warnings: 1
--> OFFLINE_DUST : true # 1980-2021
--> OFFLINE_BIOGENICVOC : false # 1980-2021
--> OFFLINE_SEASALT : false # 1980-2021
--> CalcBrSeasalt : false
--> OFFLINE_SOILNOX : true # 1980-2021
# ----- NON-EMISSIONS DATA ------------------------------------
--> UVALBEDO : true # 1985
Expand Down Expand Up @@ -145,7 +146,7 @@ Warnings: 1
--> SALA upper radius : 0.5
--> SALC lower radius : 0.5
--> SALC upper radius : 8.0
--> Model sea salt Br- : true
--> Model sea salt Br- : false
--> Br- mass ratio : 2.11e-3
108 MEGAN : off ISOP/ACET/PRPE/C2H4/ALD2/MOH/EOH/MTPA/MTPO/LIMO/SESQ/SOAP/SOAS
--> Isoprene scaling : 1.0
Expand Down Expand Up @@ -2419,11 +2420,15 @@ Warnings: 1
0 SEASALT_SALA $ROOT/OFFLINE_SEASALT/v2019-01/0.5x0.625/$YYYY/$MM/seasalt_05.$YYYY$MM$DD.nc SALA_TOTAL 1980-2017/1-12/1-31/* C xy kg/m2/s SALA - 3 2
0 SEASALT_SALAAL - - - - - - SALAAL 615 3 2
0 SEASALT_SALACL - - - - - - SALACL 616 3 2
(((CalcBrSeasalt
0 SEASALT_BrSALA - - - - - - BRSALA 617 3 2
)))CalcBrSeasalt
0 SEASALT_SALC $ROOT/OFFLINE_SEASALT/v2019-01/0.5x0.625/$YYYY/$MM/seasalt_05.$YYYY$MM$DD.nc SALC_TOTAL 1980-2017/1-12/1-31/* C xy kg/m2/s SALC - 3 2
0 SEASALT_SALCAL - - - - - - SALCAL 615 3 2
0 SEASALT_SALCCL - - - - - - SALCCL 616 3 2
(((CalcBrSeasalt
0 SEASALT_BrSALC - - - - - - BRSALC 617 3 2
)))CalcBrSeasalt
))).not.SeaSalt
)))OFFLINE_SEASALT

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5 changes: 5 additions & 0 deletions run/GCClassic/HEMCO_Config.rc.templates/HEMCO_Config.rc.aerosol
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Expand Up @@ -112,6 +112,7 @@ Warnings: 1
--> OFFLINE_DUST : ${RUNDIR_OFFLINE_DUST} # 1980-2021
--> OFFLINE_BIOGENICVOC : ${RUNDIR_OFFLINE_BIOVOC} # 1980-2021
--> OFFLINE_SEASALT : ${RUNDIR_OFFLINE_SEASALT} # 1980-2021
--> CalcBrSeasalt : false
--> OFFLINE_SOILNOX : ${RUNDIR_OFFLINE_SOILNOX} # 1980-2021
# ----- NON-EMISSIONS DATA ------------------------------------
--> UVALBEDO : true # 1985
Expand Down Expand Up @@ -1667,11 +1668,15 @@ Warnings: 1
0 SEASALT_SALA $ROOT/OFFLINE_SEASALT/v2019-01/${RUNDIR_MET_NATIVE_RES}/$YYYY/$MM/seasalt_${RUNDIR_MET_LAT_RES}.$YYYY$MM$DD.nc SALA_TOTAL 1980-2021/1-12/1-31/* C xy kg/m2/s SALA - 3 2
0 SEASALT_SALAAL - - - - - - SALAAL 615 3 2
0 SEASALT_SALACL - - - - - - SALACL 616 3 2
(((CalcBrSeasalt
0 SEASALT_BrSALA - - - - - - BrSALA 617 3 2
)))CalcBrSeasalt
0 SEASALT_SALC $ROOT/OFFLINE_SEASALT/v2019-01/${RUNDIR_MET_NATIVE_RES}/$YYYY/$MM/seasalt_${RUNDIR_MET_LAT_RES}.$YYYY$MM$DD.nc SALC_TOTAL 1980-2021/1-12/1-31/* C xy kg/m2/s SALC - 3 2
0 SEASALT_SALCAL - - - - - - SALCAL 615 3 2
0 SEASALT_SALCCL - - - - - - SALCCL 616 3 2
(((CalcBrSeasalt
0 SEASALT_BrSALC - - - - - - BrSALC 617 3 2
)))CalcBrSeasalt
))).not.SeaSalt
)))OFFLINE_SEASALT

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7 changes: 6 additions & 1 deletion run/GCClassic/HEMCO_Config.rc.templates/HEMCO_Config.rc.fullchem
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,7 @@ Warnings: 1
--> OFFLINE_DUST : ${RUNDIR_OFFLINE_DUST} # 1980-2021
--> OFFLINE_BIOGENICVOC : ${RUNDIR_OFFLINE_BIOVOC} # 1980-2021
--> OFFLINE_SEASALT : ${RUNDIR_OFFLINE_SEASALT} # 1980-2021
--> CalcBrSalt : false
--> OFFLINE_SOILNOX : ${RUNDIR_OFFLINE_SOILNOX} # 1980-2021
# ----- NON-EMISSIONS DATA ------------------------------------
--> UVALBEDO : true # 1985
Expand Down Expand Up @@ -158,7 +159,7 @@ Warnings: 1
--> NH snow age : 3.0
--> SH snow age : 1.5
--> N per snowflake : 5.0
--> Model sea salt Br- : true
--> Model sea salt Br- : false
--> Br- mass ratio : 2.11e-3
108 MEGAN : on ISOP/ACET/PRPE/C2H4/ALD2/MOH/EOH/MTPA/MTPO/LIMO/SESQ/SOAP/SOAS
--> Isoprene scaling : 1.0
Expand Down Expand Up @@ -2778,11 +2779,15 @@ Warnings: 1
0 SEASALT_SALA $ROOT/OFFLINE_SEASALT/v2019-01/${RUNDIR_MET_NATIVE_RES}/$YYYY/$MM/seasalt_${RUNDIR_MET_LAT_RES}.$YYYY$MM$DD.nc SALA_TOTAL 1980-2021/1-12/1-31/* C xy kg/m2/s SALA - 3 2
0 SEASALT_SALAAL - - - - - - SALAAL 615 3 2
0 SEASALT_SALACL - - - - - - SALACL 616 3 2
(((CalcBrSeasalt
0 SEASALT_BrSALA - - - - - - BrSALA 617 3 2
)))CalcBrSeasalt
0 SEASALT_SALC $ROOT/OFFLINE_SEASALT/v2019-01/${RUNDIR_MET_NATIVE_RES}/$YYYY/$MM/seasalt_${RUNDIR_MET_LAT_RES}.$YYYY$MM$DD.nc SALC_TOTAL 1980-2021/1-12/1-31/* C xy kg/m2/s SALC - 3 2
0 SEASALT_SALCAL - - - - - - SALCAL 615 3 2
0 SEASALT_SALCCL - - - - - - SALCCL 616 3 2
(((CalcBrSeasalt
0 SEASALT_BrSALC - - - - - - BrSALC 617 3 2
)))CalcBrSeasalt
))).not.SeaSalt
)))OFFLINE_SEASALT

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7 changes: 6 additions & 1 deletion run/GCHP/HEMCO_Config.rc.templates/HEMCO_Config.rc.fullchem
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Original file line number Diff line number Diff line change
Expand Up @@ -116,6 +116,7 @@ Warnings: 1
--> OFFLINE_DUST : ${RUNDIR_OFFLINE_DUST} # 1980-2021
--> OFFLINE_BIOGENICVOC : ${RUNDIR_OFFLINE_BIOVOC} # 1980-2021
--> OFFLINE_SEASALT : ${RUNDIR_OFFLINE_SEASALT} # 1980-2021
--> CalcBrSeasalt : false
--> OFFLINE_SOILNOX : ${RUNDIR_OFFLINE_SOILNOX} # 1980-2021
# ----- NON-EMISSIONS DATA ------------------------------------
--> UVALBEDO : true # 1985
Expand Down Expand Up @@ -157,7 +158,7 @@ Warnings: 1
--> NH snow age : 3.0
--> SH snow age : 1.5
--> N per snowflake : 5.0
--> Model sea salt Br- : true
--> Model sea salt Br- : false
--> Br- mass ratio : 2.11e-3
108 MEGAN : on ISOP/ACET/PRPE/C2H4/ALD2/MOH/EOH/MTPA/MTPO/LIMO/SESQ/SOAP/SOAS
--> Isoprene scaling : 1.0
Expand Down Expand Up @@ -2777,11 +2778,15 @@ Warnings: 1
0 SEASALT_SALA $ROOT/OFFLINE_SEASALT/v2019-01/${RUNDIR_MET_NATIVE_RES}/$YYYY/$MM/seasalt_${RUNDIR_MET_LAT_RES}.$YYYY$MM$DD.nc SALA_TOTAL 1980-2021/1-12/1-31/* C xy kg/m2/s SALA - 3 2
0 SEASALT_SALAAL - - - - - - SALAAL 615 3 2
0 SEASALT_SALACL - - - - - - SALACL 616 3 2
(((CalcBrSeasalt
0 SEASALT_BrSALA - - - - - - BrSALA 617 3 2
)))CalcBrSeasalt
0 SEASALT_SALC $ROOT/OFFLINE_SEASALT/v2019-01/${RUNDIR_MET_NATIVE_RES}/$YYYY/$MM/seasalt_${RUNDIR_MET_LAT_RES}.$YYYY$MM$DD.nc SALC_TOTAL 1980-2021/1-12/1-31/* C xy kg/m2/s SALC - 3 2
0 SEASALT_SALCAL - - - - - - SALCAL 615 3 2
0 SEASALT_SALCCL - - - - - - SALCCL 616 3 2
(((CalcBrSeasalt
0 SEASALT_BrSALC - - - - - - BrSALC 617 3 2
)))CalcBrSeasalt
))).not.SeaSalt
)))OFFLINE_SEASALT

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2 changes: 1 addition & 1 deletion run/GEOS/HEMCO_Config.rc
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Original file line number Diff line number Diff line change
Expand Up @@ -120,7 +120,7 @@ Warnings: 1
--> NH snow age : 3.0
--> SH snow age : 1.5
--> N per snowflake : 5.0
--> Model sea salt Br- : true
--> Model sea salt Br- : false
--> Br- mass ratio : 2.11e-3
108 MEGAN : on ISOP/ACET/PRPE/C2H4/ALD2/MOH/EOH/MTPA/MTPO/LIMO/SESQ/SOAP/SOAS
--> Isoprene scaling : 1.0
Expand Down

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