Causes of Tropical Atlantic Paleo-Salinity Variation During Periods of Reduced AMOC

During periods of reduced Atlantic meridional overturning circulation (AMOC) associated with a freshening of northern North Atlantic surface water, paleo proxy records indicate a corresponding surface salinity increase over the entire tropical Atlantic. Although latitudinal-shifts in the mean positi...

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Bibliographic Details
Published in:Geophysical Research Letters
Main Authors: Wan, Xiuquan, Chang, Ping, Schmidt, Matthew W
Format: Article in Journal/Newspaper
Language:unknown
Published: ODU Digital Commons 2010
Subjects:
Sea surface temperature
Thermohaline circulation
Model
Variability
Tropical Atlantic
AMOC
Geology
Oceanography
Paleontology
North Atlantic
Online Access:https://digitalcommons.odu.edu/oeas_fac_pubs/213
https://doi.org/10.1029/2009gl042013
https://digitalcommons.odu.edu/context/oeas_fac_pubs/article/1235/viewcontent/Wan_2010_Causes_of_tropical_Atlantic_paleo_sal.pdf
Description
Summary:During periods of reduced Atlantic meridional overturning circulation (AMOC) associated with a freshening of northern North Atlantic surface water, paleo proxy records indicate a corresponding surface salinity increase over the entire tropical Atlantic. Although latitudinal-shifts in the mean position of the Atlantic Intertropical Convergence Zone (ITCZ) can explain certain features of the paleo salinity reconstructions, this mechanism does not offer an explanation for the reconstructed basin-wide paleo-salinity response to AMOC change. Here, we present new results from general circulation model simulations that suggest the sea surface salinity (SSS) increase in the tropical north Atlantic during periods of weakened AMOC is mainly controlled by the atmospheric response to the North Atlantic cooling, while the oceanic teleconnection contributes to increased SSS over the equatorial and south tropical Atlantic Ocean.

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