OA = fixed

OAV = interactive

Modern

Modern

Pre-industrial concentrations (around 1750)

CO₂ = 280 ppm

CH₄ = 760 ppb

N₂0 = 270 ppb

CFC = 0

0₃ = Modern - 10 DU

Solar constant = 1365 W m-2

Eccentricity = 0.016724

Obliquity = 23.446 °

Angular precession = 102.04 °

Modern

Initialize 3-D ocean temperature and salinity from the Levitus 1998 datasets

Each group has its own spinup methodology, which we ask they document.

The model should be run long enough for any trends to be small, and the control run should be at least as long as any anomaly integrations.

OA = Same as control run

OAV = interactive

Same as control run

Same as control run

CO₂ = 280 ppm

CH₄ = 650 ppb

N₂0 = 270 ppb

CFC = 0

0₃ = Same as control run

Solar constant = 1365 W m-2 (Same as control run)

Eccentricity = 0.018682

Obliquity = 24.105 °

Angular precession = 0.87 °

Initialize 3-D ocean temperature and salinity either from the Levitus 1998 datasets or from year 100 of the control run

Same as control run

OA = Same as control run

OAV = interactive

ICE-5G v1.1

From ICE-5G v1.1 data set

CO₂ = 185 ppm

CH₄ = 350 ppb

N₂0 = 200 ppb

CFC = 0

0₃ = Same as control run

Modified according to a river pathway map

Same as control run, or add excess LGM freshwater

Solar constant = 1365 W m-2 (Same as control run)

Eccentricity = 0.018994

Obliquity = 22.949 °

Angular precession = 114.42 °

Mean ocean salinity = Same as control run

• Option 1: same as for control run (warm ocean state)

but see model spinup below

• Option 2: cold ocean state from existing LGM simulation

If initializing from modern conditions (Option 1):

1. Option 1a: we recommend doing a 100-year Haney forced run, restoring the SSTs to those of a slab model LGM anomaly SSTs.
2. Option 1b: or 100-year Haney forced run, restoring to CLIMAP LGM anomaly SSTs.
3. Option 1c: or ocean-only stage restoring SSTs to slab or CLIMAP LGM
4. Option 1d: or just run it (brute force approach)!

For both Options 1 and 2:

Run the OAGCM (initialized from either the end of Option 1, or from the cold state of an existing LGM simulation) for long enough for any trends to be small.

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