they are vey cold and dry.
Scientists classify air masses according to their general characteristics and latitude. Artic air masses form at around 60 degrees latitude, Polar masses are at around 40 degrees latitude, warm tropical air masses are at 15 degrees latitude and very hot air masses form near the equator.
No the mass of air is a function of the thickness of the atmosphere.
Maritime polar air masses.
they form over cold dry areas
Continental air masses. Tropical air masses form over water.
over northern Canada and Alaska
They form near central and northern canada
Maritime polar
Maritime polar air masses.
an air mass is a small volume of air defined by its temperature and water vapor content. Air masses cover many hundreds or thousands of square miles, and adopt the characteristics of the surface below them. They are classified according to latitude and their continental or maritime source regions. Colder air masses are termed polar or arctic, while warmer air masses are deemed tropical. Continental and superior air masses are dry while maritime and monsoon air masses are moist. Weather fronts separate air masses with different density (temperature and/or moisture) characteristics. Once an air mass moves away from its source region, underlying vegetation and water bodies can quickly modify its character. Classification schemes tackle an air mass' characteristics, and well as modification...
Maritime polar air masses
Maritime polar air masses.