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\begin{document}

\title{Precessional Climate Variations Driven from the Tropics}



\author[1]{J. R. Toggweiler}%
\affil[1]{Geophysical Fluid Dynamics Laboratory / NOAA}%


\vspace{-1em}



  
  \date{May 21, 2024}


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\begin{abstract}
The Atlantic's Meridional Overturning Circulation (AMOC) is weak when
the northern summer insolation is strong and vice-versa in the 23-kyr
precessional frequency band. The mechanism behind this response is
unknown and does not conform in any obvious way to Milankovitch theory.
The link between the AMOC and precession is attributed here to the trade
winds that blow out from Africa across the Atlantic. The trade winds,
like the AMOC itself, are weak when the northern summer insolation is
strong. The trade winds are shown here to have a direct impact on the
AMOC's return flow. A return flow altered this way should warm and cool
the Earth in a way that has not been previously considered.%
\end{abstract}%



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