BBC excerpt

[Douglas G. Wilson]

"El nino" (the ocean current) has a counterpart called "la nina", says
the BBC (no need to confuse the audience with diacritical marks, I guess).

http://news.bbc.co.uk/2/hi/science/nature/7329799.stm

The pronunciation is not made clear, but the word origin is explained:

<<La Nina translates from the Spanish as "The Child Girl">>

-- Doug Wilson

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The American Dialect Society - http://www.americandialect.org