Impact of ocean color on the maintenance of the Pacific Cold Tongue

Details Impact of ocean color on the maintenance of the Pacific Cold Tongue Impact of ocean color on the maintenance of the Pacific Cold Tongue

Jun 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007georl..3411609a&link_type=abstract

Geophysical Research Letters, Volume 34, Issue 11, CiteID L11609

Physics

Optics

12

Atmospheric Processes: Ocean/Atmosphere Interactions (0312, 4504), Oceanography: General: Numerical Modeling (0545, 0560), Oceanography: General: Ocean Predictability And Prediction (3238), Oceanography: General: Ocean Optics (0649), Paleoceanography: El Nino (4522)

Scientific paper

The impact of the penetration length scale of shortwave radiation into the surface ocean is investigated with a fully coupled ocean, atmosphere, land and ice model. Oceanic shortwave radiation penetration is assumed to depend on the chlorophyll concentration. As chlorophyll concentrations increase the distribution of shortwave heating becomes shallower. This change in heat distribution impacts mixed-layer depth. This study shows that removing all chlorophyll from the ocean results in a system that tends strongly towards an El Niño state-suggesting that chlorophyll is implicated in maintenance of the Pacific cold tongue. The regions most responsible for this response are located off-equator and correspond to the oligotrophic gyres. Results from a suite of surface chlorophyll perturbation experiments suggest a potential positive feedback between chlorophyll concentration and a non-local coupled response in the fully coupled ocean-atmosphere system.

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