Synoptic-scale winds can be thought of as distinct streams of air, which may emerge from large regions of uniform air temperature, humidity, stability, wind speed and direction. Then the atmosphere comes to be regarded as consisting of discrete 'air masses' and this approach to meteorology became customary in the middle of the twentieth century.
An 'air mass' is a fairly uniform body of air, hundreds or thousands of kilometres across, with surface dry-bulb and dewpoint temperatures within a few degrees of the respective averages. Alternatively, and preferably, we characterise air masses by the values of 'conserved' variables, such as the mixing ratio (Note 6.B), the
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Renewable energy is energy that is generated from sunlight, rain, tides, geothermal heat and wind. These sources are naturally and constantly replenished, which is why they are deemed as renewable. The usage of renewable energy sources is very important when considering the sustainability of the existing energy usage of the world. While there is currently an abundance of non-renewable energy sources, such as nuclear fuels, these energy sources are depleting. In addition to being a non-renewable supply, the non-renewable energy sources release emissions into the air, which has an adverse effect on the environment.