One hundred specialists drawn from the United Nations and the organization that polices the global ban on chemical weapons will be sent to Syria over the next eight months to help dismantle and destroy its roughly 1,000-ton arsenal, an extremely hazardous task that has never been tried and that could fail without Syria’s cooperation, Secretary General Ban Ki-moon said Monday.

In a 10-page report submitted to the United Nations Security Council that provided new detail on the undertaking, Mr. Ban said he would establish a joint mission with the policing group, the Organization for the Prohibition of Chemical Weapons. It will be based in Damascus, the Syrian capital, but will include a staging ground on the Mediterranean island nation of Cyprus, about 300 miles west.

Mr. Ban said the staging ground would help increase security for the workers and the specialized equipment needed to help monitor and neutralize Syria’s vast quantities of deadly chemical compounds. It is “highly probable,” he said, that he will ask other member states, which he did not identify, to help the joint mission complete its work.

His report provided the first official indication of the size of the staff for the mission. The roughly 35-member advance team currently in Syria would grow to “approximately 100 personnel.”