NEW YORK, July 9 (Reuters) - The Intercontinental Exchange (ICE) raised on Tuesday its margin requirements for some arabica coffee futures by as much as 11.4% in a day when prices jumped more than 6% in New York trading.

ICE said in a notice to market participants that the initial margin requirement for arabica futures contracts expiring in September is going up to $6,645 per contract from $6,000 previously (10.45%).

Initial margin requirement for contracts expiring in March 2025 were raised to $6,120 per contract from $5,490 previously (11.4%). The exchange also raised margin requirements for several inter-month add-ons, according to the notice.

Exchanges usually raise margin requirements when the value of the assets being traded go up sharply, as a way to reduce the risk involved in that trading. They can also increase margins as a way to reduce volatility.

"In theory, that would cool off the trading," said a U.S.-based broker.

Arabica coffee futures gained 34% this year so far. They rose to the highest in nearly two years and a half on Tuesday. Robusta coffee, traded in London, rose to an all-time high.

Traders that are carrying large short positions in the market, for example, such as the ones sourcing coffee in producing countries such as Brazil or Colombia, could be compelled to liquidate part of that position to avoid paying higher margins on their position.

(Reporting by Marcelo Teixeira; Editing by Josie Kao)