Developing UKESM

Recent results from GA6.0#136.17 (including GLOMAP-mode) + CheST (StratTrop chemistry)

Model Run	Chemistry	Aerosol-microphys	Aerosol-optical	Owner	UM version	Monsoon job ID	Met Office ID	Link to chemistry evaluation	Link to aerosol evaluation	Link to Validation Note	Comments
1	StratTrop	GLOMAP-mode	RADAER/ACTIVATE/Gas-phase RF OFF	Steven Hardiman	10.2	N/A	mi-ah813	ah813.pdf ah813_updated.pdf	None at present	ai985 vs ah813	Run for 20 years - plots based on last 10 years; Biogenic ems prescribed; No trop het chem; Lightning ems 10.7 TgN/yr; CH4 lifetime too short; Strat o3 max reduced and in better agreement with obs; Diagnosed STE flux of O3 clearly wrong. Updated pdf now includes updated methane lifetime calculation and nh_oh/sh_oh ratio.
2	StratTrop	GLOMAP-mode	RADAER/ACTIVATE/O3, N2O, CH44 RF ON	Steven Hardiman	10.2	N/A	mi-ai985	ai985.pdf ai985_updated.pdf	None at present	ai985 vs ah813	Run for 20 years - plots based on last 10 years; Biogenic ems prescribed; No trop het chem; RF bugfix included; Lightning ems 10.7 TgN/yr; CH4 lifetime too short; Strat o3 max reduced and in better agreement with obs; Diagnosed STE flux of O3 clearly wrong. Updated pdf now includes updated methane lifetime calculation and nh_oh/sh_oh ratio.
3	StratTrop	GLOMAP-mode	RADAER/ACTIVATE/O3, N2O, CH4 RF ON	Steven Hardiman	10.2	N/A	mi-aj868	aj868.pdf aj868_updated.pdf	None at present	aj868 vs ai985	RF bugfix included; Lightning emissions halved. Updated pdf now includes updated methane lifetime calculation and nh_oh/sh_oh ratio. Methane lifetime now increased.
4	StratTrop	GLOMAP-mode	RADAER/ACTIVATE/O3, N2O, CH4 RF OFF	João Teixeira	10.2	N/A	mi-ak384	ak384.pdf	None at present	ak384 vs aj868	RF bugfix included; Lightning emissions halved. Updated pdf now includes updated methane lifetime calculation and nh_oh/sh_oh ratio.

Results from GA7.0 (including GLOMAP-mode) + CheST (StratTrop chemistry)

Model Run	Chemistry	Aerosol-microphys	Aerosol-optical	Owner	UM version	Monsoon job ID	Met Office ID	Link to chemistry evaluation	Link to aerosol evaluation	Link to Validation Note	Comments
1	StratTrop	GLOMAP-mode	RADAER/ACTIVATE/Gas-phase RF ON	Mohit Dalvi	10.3	N/A	u-ac900 GA7 N96 AMIP	u-ac900 Evaluation u-ac253 Evaluation	None at present	None at present	Run for 10 years - plots based on 10th year; Lightning emissions halved. Tropopause height bugfix included; Branch to maintain SAD above 12km ; compared against base vn10.3 GA7 suite -u-ac253

Investigating Low OH, High Methane Lifetime in vn10.5 GA7.0 CheST/StratTrop + GLOMAP simulations

Suite-Id

Owner

UM version

Branches and Configuration Details (apart from CheST+GLOMAP+RADAER+UKCAGHG)

Simulation Length

Plots

CH4 lifetime years Whole Atm vs OH; ACCMIP=9.3 +/− 0.9

Mean OH molec/cm3 ACCMIP = 1.17 (+/− 0.1) e+06

Comments

u-ac253

FOC

vn10.3

Lightning NOx 50%, Tropopause height bugfix ukca_ch2br2mmr=1.802e-11, ukca_h2mmr=3.453e-08

20 year, Plots:11-20yr

{pdf:ac253_Lawrence_plot.pdf ac253_OH_Lawrence}, {pdf:ac253_tau_ch4.pdf ac253_ch4_lifetime}

8.63

8.98e+05 molec/cm3

-

u-ae771

MD

vn10.5

Lightning NOx 50%, Tropopause height bugfix, Stratospheric aer-surf-area fixes ukca_ch2br2mmr=1.0000-12, ukca_h2mmr=500.0e-09

20 year, Plots:11-20yr

{pdf:ae771_Lawrence_plot.pdf ae771_OH_Lawrence}, {pdf:ae771_tau_ch4.pdf ae771_ch4_lifetime}

8.63

8.98e+05 molec/cm3

u-ad265

MD

vn10.3

Lightning NOx 50%, Tropopause height bugfix, Stratospheric aer-surf-area fixes ukca_ch2br2mmr=1.802e-11, ukca_h2mmr=3.453e-08

20 year, Plots:11-20yr

{pdf:ac253_Lawrence_plot.pdf ac253_OH_Lawrence}, {pdf:ac253_tau_ch4.pdf ac253_ch4_lifetime}

8.63

8.98e+05 molec/cm3

-