Christian Alexandersen, Oldenburger

Hello!
I'm looking for Christian Alexandersen. He had told that he was an
Oldenburger, and was born aboute 1778. He spoke danish very well, and his
german language was platt. In 1809 he came from Hamburg to Archangelsk. He
was captain at the bark Patriot. He left Archangelsk in 1809, and ended the
sailing in the north of Norway. I would be happy for any information!