Back to overview of v1 DECK simulations (low-res, water cycle)

Initialization of DECK piControl simulation

Due to time constraints, piControl year 1 (0001-01-01) initial conditions are taken from a pre-existing simulation rather than starting a new spin-up from scratch. The initial conditions are 0331-01-01 of 20171228.beta3rc13_1850.ne30_oECv3_ICG.edison.

Provenance of initial conditions:

MPAS-O stand-alone initialization
10 years of G-case (20170814.FCTfix-del4.GMPAS-IAF.T62_oECv3.anvil)
- Ocean and sea-ice restart as initial conditions for
50 years coupled FCT2 (0001-0051; 20170926.FCT2.A_WCYCL1850S.ne30_oECv3.anvil)
- Year 51 ocean and sea-ice restart as initial conditions for
150 years of coupled beta3rc10 (0001-0151; 20171122.beta3rc10_1850.ne30_oECv3_ICG.edison)
- Year 151 atmosphere, land, river, ocean and sea-ice restart as initial conditions for
100 years of coupled beta3rc11 (0151-0251; /wiki/spaces/SIM/pages/408453940)
- Year 251 atmosphere, land, river, ocean and sea-ice restart as initial conditions for
80 years of coupled beta3rc13 (0251-0331; 20171228.beta3rc13_1850.ne30_oECv3_ICG.edison)
- Year 331 atmosphere, land, river, ocean and sea-ice restart as initial conditions for
DECK v1 piControl

Final tuning

At the time piControl needed to start, we were still in the process of fine tuning the control simulation to reduce its long term drift in surface air temperature as much as possible. 20171228.beta3rc13_1850.ne30_oECv3_ICG.edison was the configuration with the smallest drift at the time. However, due to its limited duration (80 years), we couldn't conclusively determine whether the drift was as small as it could be. As a result, we decided to start two piControl simulations with the goal of running both of them for 100 years and then selecting one:

20180129.DECKv1a_piControl.ne30_oEC.edison : identical tuning as in /wiki/spaces/SIM/pages/478412855 ,but with a slightly updated version of the code base.
20180129.DECKv1b_piControl.ne30_oEC.edison : same, except for a minor retuning of clubb_c14: 1.08 → 1.06. This is expected to only change net TOA fluxes by a few hundreds of a W/m2, but may help further reduce long-term drift (without hopefully changing its sign).

On 15 Feb 2018, both v1a and v1b piControl simulations completed 110 years. Analysis of the global surface temperature trend for years 11 to 110 revealed that v1b had the smallest drift of the two. Comparison of climatologies for years 51-100 between the two configurations showed almost no differences, as expected. As a result, v1b was selected as the final tuning for the Water Cycle low-res model.

Log

29 Jan 2018 : initial configuration and testing
30 Jan 2018 : simulation started
15 Feb 2018 : v1b is selected as the final tuning due to its reduced drift.

Edison jobs

20180129.DECKv1a_piControl.ne30_oEC.edison

#	Simulation period	Years	Nodes	BFBFLAG	Time stamp	Duration (hr)	Raw core hours	Cost per year	Effective SYPD	Notes
1	0001-01-01 - 0017-01-01 0017-01-01 - 0021-01-01	16 4	285 285	true true	180130-111213 180131-235230	45.619	319,699.12	15,985	10.52
2	0021-01-01 - 0041-01-01	20	285	true	180201-180612	43.214	302,840.99	15,142	11.1
3	0041-01-01 - 0055-06-25	14	285	true	180208-020622					Died because of bus error. MyNERSC not reporting usage data.
4	0055-01-01 - 0075-01-01	20	285	true	180209-143851					MyNERSC not reporting usage data.
5	0075-01-01 - 0094-01-01	19	285	true	180211-105622					MyNERSC not reporting usage data.
6	0094-01-01 - 0113-01-01	19	285	true	180213-051928	43.518	297,659.70	15,666	10.48	Stopping v1a since v1b has been selected as the final tuning.

20180129.DECKv1b_piControl.ne30_oEC.edison

#	Simulation period	Years	Nodes	BFBFLAG	Time stamp	Duration (hr)	Raw core hours	Cost per year	Effective SYPD	Notes
1	0001-01-01 - 0017-01-01 0017-01-01 - 0021-01-01	16 4	285 285	true true	180130-143234 180201-020421	44.201	309,759.44	15,488	10.86
2	0021-01-01 - 0041-01-01 0041-01-01 - 0042-01-01	20 1	285 285	true true	180202-091048 180204-045726	46.804	328,001.65	15,619	10.77
3	0042-01-01 - 0060-11-19	18	285	true	180208-043625					Running slowly; could not complete 20 years in 48 hours. MyNERSC no longer reporting usage data.
4	0060-01-01 - 0079-01-01	19	285	true	180210-113736					MyNERSC not reporting usage data.
5	0079-01-01 - 0098-01-01	19	285	true	180212-084552	42.395	289,981.80	15,262	10.76
6	0098-01-01 - 0117-01-01	19	285	true	180214-030946	43.365	296,614.70	15,611	10.52