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Interactive freshwater stretches AMOC’s slow beat
Fixing freshwater flux in CESM1 inserts a ~30-year AMOC peak; coupling precipitation, evaporation, and ice melt lengthens the cycle via Labrador Sea salinity.
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What model configuration is used?
CESM1 with ~2° atmosphere and ~1° ocean, telescoped around Greenland.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
How long is the fully coupled control?
1,400 years of preindustrial CESM1.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
What is FWFIX?
A run where freshwater flux is prescribed as its daily climatology, not evolving.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
How is the AMOC index defined?
PC-1 of the overturning streamfunction.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
What periods were filtered out before spectra?
High-frequency variability shorter than 15 years.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
Where does coupled AMOC spectral power sit?
A broad 50–100-year band above red noise.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
What extra peak appears without interactive FWF?
A sharp ~30-year AMOC peak.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
What does interactive FWF do overall?
Lengthens multidecadal AMOC variability and suppresses the ~30-year mode.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
How do Labrador Sea densities lead AMOC even in FWFIX?
Dense upper waters form ~15 years before the AMOC peak; max r~0.5 at 5-year lead.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
How much longer do positive density anomalies last with FWF?
About 50% longer, from ~17 to ~25 years.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified
What two FWF processes lengthen Labrador salinity anomalies?
Local evaporation-driven salinification and remote advection from the Irminger Sea.
Source: Freshwater Flux Variability Lengthens the Period of the Low-Frequency AMOC Variability · DOI · quote verified