Topic of the Day: Air Masses Category: Geography
Today’s Topic of the Day is ‘Air Masses’ which is one of the topics in NCERT Geography textbook.
The topic of the Day (ToD) will help the aspirants to know the basic concepts and make their foundation strong while preparing for UPSC IAS Exam. Reading Topic of the Day religiously will mould the aspirants to prepare for Current affairs in a very effective way and make relevant current affairs notes. The section of Topic of the Day will also make easy for candidates in making short notes on certain topics.
- Air mass is a volume of air well-defined by its temperature and water vapor content.
- It is an enormously large body of air whose properties of temperature and humidity, at any given elevation, are similar in any horizontal direction.
- The air mass stretches from surface to lower stratosphere and is spread across thousands of kilometers.
- Front is the transition zone between air masses with noticeable different properties.
- The air masses found near Antarctic, Arctic, and polar regions are cold.
- It form a vital part of the global planetary wind system.
- The major source regions are the high-pressure belts in the subtropics and around the poles.
- Regions with high pressure but slight pressure variance or pressure gradient are perfect source regions.
- There are no main source regions in the mid-latitudes as these areas are controlled by cyclonic and other disturbances.
The air masses are categorized into four according to the latitude and their continental or maritime source regions.
- Polar latitudes – positioned poleward of 60 degrees north and south
- Tropical latitudes – positioned within about 25 degrees of the equator
- Continental – situated over large land masses
- Marine – situated over the oceans