Difference between revisions of "NOy PEG"
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{{pdf| Xjcir_eval_yr01.pdf | Xjcir_eval_yr01.pdf }} <br/> |
{{pdf| Xjcir_eval_yr01.pdf | Xjcir_eval_yr01.pdf }} <br/> |
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{{pdf| Xjcin_eval_yr09.pdf | Xjcin_eval_yr09.pdf }} <br/> |
{{pdf| Xjcin_eval_yr09.pdf | Xjcin_eval_yr09.pdf }} <br/> |
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{{pdf| Xjcin_eval_yr10.pdf | Xjcin_eval_yr10.pdf }} <br/> |
{{pdf| Xjcin_eval_yr10.pdf | Xjcin_eval_yr10.pdf }} <br/> |
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+ | |- |
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+ | || Evaluation Suite Output (Aerosol) |
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+ | N/A |
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+ | {{pdf| Xjcin_EvalAero_yr01.pdf | Xjcin_EvalAero_yr01.pdf }} <br/> |
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+ | {{pdf| Xjcin_EvalAero_yr02.pdf | Xjcin_EvalAero_yr02.pdf }} <br/> |
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+ | {{pdf| Xjcin_EvalAero_yr03.pdf | Xjcin_EvalAero_yr03.pdf }} <br/> |
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+ | {{pdf| Xjcin_EvalAero_yr04.pdf | Xjcin_EvalAero_yr04.pdf }} <br/> |
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+ | {{pdf| Xjcin_EvalAero_yr05.pdf | Xjcin_EvalAero_yr05.pdf }} <br/> |
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+ | {{pdf| Xjcin_EvalAero_yr06.pdf | Xjcin_EvalAero_yr06.pdf }} <br/> |
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+ | {{pdf| Xjcin_EvalAero_yr07.pdf | Xjcin_EvalAero_yr07.pdf }} <br/> |
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+ | {{pdf| Xjcin_EvalAero_yr08.pdf | Xjcin_EvalAero_yr08.pdf }} <br/> |
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+ | {{pdf| Xjcin_EvalAero_yr09.pdf | Xjcin_EvalAero_yr09.pdf }} <br/> |
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+ | {{pdf| Xjcin_EvalAero_yr10.pdf | Xjcin_EvalAero_yr10.pdf }} <br/> |
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|| NOy species time evolution || {{pdf| Xjcir_NOy.pdf | Xjcir_NOy.pdf }} || {{pdf| Xjcin_NOy_yr01-06.pdf | Xjcin_NOy_yr01-06.pdf }} |
|| NOy species time evolution || {{pdf| Xjcir_NOy.pdf | Xjcir_NOy.pdf }} || {{pdf| Xjcin_NOy_yr01-06.pdf | Xjcin_NOy_yr01-06.pdf }} |
Revision as of 17:23, 24 June 2014
vn7.3 vs. vn8.4
While UKCA had low NOy at vn7.3, this feature has not improved when moving to vn8.2/vn8.4 GA4.0 jobs, and may even have become worse.
A pair of simulations have been set-up to try to aid the diagnosis of the cause of this low NOy. While there have been many changes to the base atmospheric model, the differences between the UKCA chemistry scheme used have been minimised.
- All surface and aircraft chemical emissions are the same between both jobs, and are year 2000 climatologies
- The SST/Sea-Ice ancillaries are daily means from the Reynolds dataset, and are meaned over 1995-2005
- All chemical reactions and associated rates are the same between both jobs
- The GHGs and tracer lower boundary conditions are the same for both jobs
- 2000-12-01 from the CCMI REF-C2 specification taking WMO2011 values for ODSs and following the historical values for GHGs from the RCP scenarios defined for CMIP5
- The initial conditions of the chemical species are the same for both jobs, originally taken from a vn7.3 job. The winds and other physical initial conditions are different however
- Radiative feedback from O3 is included in both jobs
- vn8.4 job also considers radiative feedback from aerosols
- The same lightning NOx routine were used by both models, and these were scaled to give approximately the same annual emissions
NOTE: While the vn8.4 job does include GLOMAP-mode aerosols and some extra associated chemical reactions, the low NOy has also been observed in the vn8.2 CheST (only) configuration.
Results
VN7.3 | VN8.4 | |
MONSooN jobid | xjcir | xjcin |
Configuration | HadGEM3-A r2.0 | HadGEM3-A GA4.0 |
Resolution | N48L60 | N96L85 |
UKCA scheme | CheST | CheST+GLOMAP |
Model set-up | TS2000 | TS2000 |
Evaluation Suite Output (Chemistry) |
Xjcir_eval_yr01.pdf |
Xjcin_eval_yr01.pdf |
Evaluation Suite Output (Aerosol) |
N/A |
Xjcin_EvalAero_yr01.pdf |
NOy species time evolution | Xjcir_NOy.pdf | Xjcin_NOy_yr01-06.pdf |
Comparison with SLIMCAT | Compare_SLIMCAT_UKCA.pdf | |
Lightning NOx |
year 01 4.31451 Tg(N)/year |
year 01 3.93965 Tg(N)/year |
Minutes from meeting 2014-02-13
- Present
- Luke Abraham (NLA), Alex Archibald, James Keeble (JMK), Sandip Dhomse, Paul Griffiths, Martyn Chipperfield, John Pyle, Fiona O'Connor (skype)
- Further experiments suggested
- Change how the NOy species are treated: removed these from transform_halogen and make a new routine which also requires NO2 to be transported. The NOy (i.e. Lumped N) tracer is also advected and this is used as a test against the calculated NOy field from the individual species. Using this comparison the NOy species can be rescaled according to the ratio of and . BrONO2 and ClONO2 should not be rescaled as this would change the Cl and Br species. A diagnostic check on the differences between and should be done, as well as possibly checking for global conservation during transport. The NALD tracer is not currently included and should be. (NLA to do)
- Further to the above, try turning off all other processes and check the advection over a short run. Other steps could then be added piecewise to see their effects.
- Check that N2O5 is not causing any problems by setting its rates to zero and set it to no_change in transform_halogen (JMK to do)