Simulated AMOC forced by atmspheric forcings

AMOCs compared to RapidMOC

20thC forcing	NCEP forcing 1	NCEP forcing 2
AMOC from 1871-2009	AMOC from 1948-2016	AMOC from 1948-2016
Model grid: tnx1v1 (not BCCR Fast version)	Model grid: mnp2 (old MICOM-ICE alone stand version)	Model grid: tnx1v1 (BCCR Fast vesion, by Jörg Schwinger)

Power spectrum

20CR forcing	NCEP forcing 1	NCEP forcing 2
total	total	total
Florica Current
Ekman transport
Upp-mid ocean transport

Simulated AMOC and power spectrum in paleo simulations

• Marine isotope stage 3b (mis3b)
• Eemian periods: 115ka, 120ka, 125ka, 130ka
• Control preindustrial simulation: 1000-2000 years
• Model grid: tnx1v1 (BCCR Fast version)

AMOC timeseries

• 20 years running mean

Power spectrum

Eemian 115ka	Eemian 120ka

Eemian 125ka	Eemian 130ka

MIS 3b	PI control 1001-2000

ORGANIC simulation

Power spectrum

PI control 1001-3000 (left figure), and its power spectrum (right figure)

AMOC timeseries	Power spectrum

Power spectrums of randonly selected 100 years timeseries from the 2000 years PI control run

Years 1401-1500	Years 1701-1800

Years 2001-2100	Years 2301-2400

Years 2601-2700	Years 2901-3000

Overturning at strong and weak AMOC times

AMOC from PI years 10001-3000

Gray-dashed lines are $\pm 1.5 \sigma$ AMOC

mmflxd

mean (yrsmax)	diff (yrsmax-yrsmin)

strmf

mean (yrsmax)	diff (yrsmax-yrsmin)

sst

mean (yrsmax)	diff of (yrsmax-yrsmin)

sss

mean (yrsmax)	diff of (yrsmax-yrsmin)

sealv

mean (yrsmax)	diff of (yrsmax-yrsmin)

hflx

mean (yrsmax)	diff of (yrsmax-yrsmin)

mld March

mean (yrsmax)	diff of (yrsmax-yrsmin)

mld Annual

mean (yrsmax)	diff of (yrsmax-yrsmin)

fice

mean (yrsmax)	diff of (yrsmax-yrsmin)

ztx

mean (yrsmax)	diff of (yrsmax-yrsmin)

mty

mean (yrsmax)	diff of (yrsmax-yrsmin)