What type of weather briefing should a pilot request to supplement mass disseminated data?

Requesting an abbreviated briefing is the most suitable option when a pilot seeks to supplement mass disseminated data. An abbreviated briefing is designed for situations where a pilot has already reviewed the general weather information available through mass dissemination and requires only specific updates or details. This briefing type focuses on key weather changes or relevant conditions that could impact a flight, while avoiding redundancy about information the pilot already knows.

In contrast, a complete briefing would provide extensive information, including all elements of the weather situation and forecasts. A standard briefing offers a comprehensive overview but may not be tailored specifically to the pilot's previously acquired knowledge. A detailed briefing might involve more in-depth analysis than necessary for a pilot looking to supplement existing knowledge efficiently. Therefore, the abbreviated briefing is the most effective choice for gaining relevant and concise weather information without unnecessary repetition.