Definition

1. Noun:
   • The atmospheric pressure reduced by a formula to the pressure at sea level: It is the calculated or adjusted barometric pressure reading, standardized to what it would be if measured at sea level, allowing for consistent comparison between locations at different altitudes.

Usage

• Primary Use: This term is used in meteorology, aviation, and climatology to report and compare atmospheric pressure readings from various geographical locations on a common reference plane (mean sea level).
• Context: It is typically used in weather reports, aviation forecasts (e.g., altimeter settings), and scientific analyses of pressure systems.

Examples

• Noun:
  • The weather map shows isobars connecting points of equal sea-level pressure.
  • For safe landing, the pilot adjusted the altimeter to the current sea-level pressure.
  • A low sea-level pressure often indicates stormy weather.

Advanced Usage

• "Mean sea-level pressure (MSLP)": The average sea-level pressure over a period, often used in climate studies.
  • The mean sea-level pressure for the region has shown a slight increase over the decade.

Variants and Related Words

• Station pressure: The actual atmospheric pressure measured at a specific location and elevation, adjusted to sea level.
• Altimeter setting: The value of sea-level pressure used to calibrate an aircraft's altimeter.
• Isobar: A line on a map connecting points of equal sea-level pressure.

Synonyms

• Reduced pressure (in a meteorological context).
• Barometric pressure (adjusted).

Related Phrases

• To reduce pressure to sea level: The process of calculating the sea-level pressure from a station pressure measurement.
  • The meteorologist reduced the station pressure to sea level for the report.

Noun

1. the atmospheric pressure reduced by a formula to the pressure at sea level