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\begin{document}

\title{Forcing of the MJO-related Indian Ocean Heating on the Intraseasonal
Lagged NAO}



\author[1]{Xiaolu Shao}%
\author[2]{David Martin Straus}%
\author[3]{Shuanglin Li}%
\author[2]{Erik Swenson}%
\author[4]{Priyanka Yadav}%
\author[5]{Jie Song}%
\affil[1]{Hohai University}%
\affil[2]{George Mason University}%
\affil[3]{Institute of Atmospheric Physics, CAS}%
\affil[4]{University of Delaware}%
\affil[5]{LASG, Institute of Atmospheric Physics, Graduate School of the Chinese Academy of Science}%


\vspace{-1em}



  
  \date{May 27, 2024}


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\begin{abstract}
Based on the experiments with the Coupled Forecast System version 2
(CFSv2), the mechanism by which the Madden-Julian Oscillation (MJO)
modulates the North Atlantic Oscillation (NAO) is investigated. To
isolate the cyclic MJO heating with an eastward propagation over the
Indian Ocean and western Pacific, three sets of experiments are
conducted with spatio-temporal varying heating added to the model's
internally generated heating. The results suggest that the anomalous MJO
heating over the Indian Ocean, rather than the western Pacific,
dominates the formation of the NAO anomaly in the following 10-20 days.
The MJO heating triggers a westward propagation of the storm track that
influences Europe, complementing the eastward pathway of influence via
the North Pacific. Both pathways contribute to an enhanced storm track
over the North Atlantic and the positive NAO anomaly. The Eurasian
pathway is less important for the formation of the negative NAO anomaly.%
\end{abstract}%



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