Experiments
Pre-industrial Equilibrium (Equil)
The model must be able to track ocean carbon and may be capable of providing climate, sediment, or vegetation carbon
feedbacks. For some experiments, the ability to turn on or off feedbacks from the pre-industrial state is required.
Simulation of carbon-14 is desirable in order to assess long time-scale uptake. Use OCMIP criteria for determining
carbon-14 equilibrium. The equilibrium state is desinated as "Equil".
Input:
- year 1765 (preferred) or between 1700 to 1850
- CO2 at 278 ppmv (preferred) or between 275 to 288
Output:
- annual average of delta carbon-14 and total ocean carbon, all points (preferred)
or just global average
Control (Cont_cswv, Cont)
This is a continuation of the integration that produced the equilibrium state or it can be output from the integration
that produced the equilibrium state. This will be used to access any model drift. One thousand years of the
equilibrium state is prefered but any amount of time would be useful. The control experiment with all feedbacks should
be designated as "Cont_cswv" (following the naming convention outlined for the
CO2 Neutralization Experiments). If fixed component experiments are being done, then a second
control integration in which all potential components are fixed would also be useful in order to access any drift
caused by fixing model components. The control integration with fixed components should be designated as
"Cont".
Input:
- zero emissions and no changes to other climate forcings
Output:
- annual, global average time series of atmospheric CO2,
total ocean carbon and alkalinity
- annual average snapshots of model state at least every 100 years
Historical (Hist_cswv)
This experiment is performed with specified historical atmospheric CO2 and CFC (11 and/or 12)
concentrations from pre-industrial to compare modelled 1994, ocean CFC, total carbon and recent atmosphere-ocean fluxes
to data estimates. The historical integration is designated as "Hist_cswv".
Input:
- historical CO2 and CFCs from pre-industrial to 2006
(required), other transient climate forcings (acceptable)
Output:
- annual, global average time series of CFCs, total ocean carbon and
atmosphere-ocean carbon flux
- 1994 annual average of ocean CFCs, total carbon and alkalinity, all points
(preferred) or just global average
Doubling CO2 from Pre-industrial (2xPI)
This experiment involves a rapid doubling of CO2 from pre-industrial. A 1000 year simulation
with no climate, sediment, weathering or vegetation feedbacks is the highest priority. The idea is to compare the
models response to earlier OCMIP models. The doubling CO2 experiment without feednacks is
designated "2xPI". Other feedback experiments or longer integrations would also be
desirable. If additional experiements with feedbacks are performed, use the naming convention outlined for the
CO2 Neutralization Experiments. For models without an atmosphere, convert emissions to
concentration of CO2 with 1 ppmv = 2.123 Pg C.
Input:
- 590.2 Pg C in a short pulse, instantaneous (preferred) or as quickly as the model
is able
Output:
- annual, global average time series of atmospheric CO2,
total ocean carbon and alkalinity
- annual, global average time series of surface ocean DIC, alkalinity and
pCO2
- annual average snapshots of model state at least very 100 years
CO2 Neutralization Experiments
Total emissions of 1000, 5000 and 100 Pg C (in order of priority) from pre-industrial should be considered. These
experiments should be for at least 1000 years but 10,000 years or equilibrium is preferred. Any or all of the following
sensitivity experiments could be performed (1000, 5000 and 100 Pg experiment designations followed by description, roughly
in order of priority):
- 1000, 5000, 100:
ocean without climate, sediment, weathering or vegetation feedbacks
- 1000_c, 5000_c, 100_c:
ocean with only climate feedbacks
- 1000_cs, 5000_cs, 100_cs:
ocean with only climate and sediment feedbacks
- 1000_csw, 5000_csw, 100_csw:
ocean with only climate, sediment and weathering feedbacks
- 1000_cswv, 5000_cswv, 100_cswv:
ocean with climate, sediment, weathering and vegetation feedbacks
- 1000_s, 5000_s, 100_s:
ocean with only sediment feedbacks
Input:
- constant emissions over 1 year (preferred) or as quickly as the model is able
Output:
- annual, global average time series of atmospheric CO2,
total ocean carbon and alkalinity
- annual average snapshots of model state at least every 100 years
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