which of the following best explains moderate coastal climates?

which of the following best explains moderate coastal climates?

which of the following best explains moderate coastal climates?

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Which of the following best explains why coastal regions generally have more moderate air temperatures than inland regions of the same latitude?

A. The ocean has a moderating effect on the area.
B. Most of the sunlight that reaches the ocean’s surface is reflected.
C. Coastal regions have a lower altitude.
D. Heat energy is transferred from inland areas to coastal areas during the summer and from coastal areas to inland areas during the winter.

ANSWER: A
which of the following best explains moderate coastal climates?
which of the following best explains moderate coastal climates?

What Is A Coastal Region?

The name, coastal region (also known as a coastal zone), can be a bit vague for some, as it does not pinpoint a specific location and are mostly a transitional area. To best understand what a coastal region is, the following definition will help to clarify this term.

Some definitions include the borders between land and large inland lakes, but to clearly define a Coastal Climate, our focus will remain on the boundary between land and ocean. (The varying sizes of inland bodies of water may negate the effect of actual coastal weather.)

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The Climate Of A Coastal Region

The climate of a coastal region is characterized by several weather conditions, which combine to form atmospheric conditions that are unique to areas in and around the coast.

The best way to describe a Coastal Climate is to first list the various weather conditions that define it and then look at each one in more detail. The primary weather conditions that are associated with a coastal region are:

  1. Sea Breeze During The Day
  2. Land Breeze In The Evenings
  3. Moderate Climate Throughout The Year
  4. Coastal Fog
  5. Higher Rainfall Than Inland Areas

These characteristics are typical weather conditions you will find at the coast in temperate clime zones. There are obvious exceptions to the rules, especially in regions situated at higher latitudes and closer to the Tropics.

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which of the following best explains moderate coastal climates?
which of the following best explains moderate coastal climates?

Coastal regions where a desert meets the ocean can also have a vastly different climate. For example, The Skeleton Coast in the Namid Desert, and the Atacama Desert in Chile are some of the driest regions in the world. These are exceptions to the rule, though.

1) Sea Breeze During The Day

A sea breeze, much like the majority of weather conditions experienced at the coast, is the result of the contrasting way in which the land and ocean react to changes in temperature.

During the day, both the land and ocean warm up, but the land warms up much faster than the ocean water. As you will soon discover, it is important to note that even though the ocean takes longer to warm up, it is also able to retain the heat much longer than the land.

As the land warms up,  it heats the air at the surface. The warm air rises and expands, which leaves less air at the surface, creating a low-pressure system over land. Since water over the ocean takes longer to warm up, it allows the air above it to maintain a higher pressure. 

Since air always flows from a high-pressure to a low-pressure system, the air from the ocean flows to the land. This forms the sea breeze we are so familiar with, which usually occurs during the afternoons and early evenings. 

Depending on the contrast in temperature between land and sea, the wind blowing from the ocean may vary from a light breeze to relatively strong gusty wind. 

2) Land Breeze In The Evenings

During the evening, the opposite occurs. The land cools off much faster than the ocean, which retains the heat absorbed during the day much longer. (The reason why I highlighted this ability of the ocean in the previous section.)  

As a result, the colder air over land forms a high-pressure system, while the warm air over the ocean water rises and creates a low-pressure system. 

The wind now blows from the high-pressure area over land to the low-pressure area over the sea. This is how a land breeze is formed, which usually occurs late in the evening and the early hours of the morning.

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To find out how high and low-pressure systems are formed and how they influence the weather.

which of the following best explains moderate coastal climates?
which of the following best explains moderate coastal climates?

3) Moderate Climate Throughout The Year

The fact that the ocean takes much longer to warm up than land, and its ability to retain heat much longer than as well, do not just play a role in the creation of land and sea breezes but are also responsible for the moderate climate of coastal regions.

During the summer season, the air temperature over land warms up fairly quickly, while the ocean remains relatively cold since it takes longer to absorb the heat. During the winter months, the land cools down faster than the ocean, which is able to retain its heat longer.

This results in cooler air moving in from the ocean during the summer and warmer air over the sea that is blown inland during the winter months. This creates a more moderate climate where the summers are cooler and the winters milder than inland regions.

Please note that the moderate climate of a coastal region is in relation to the inland area of a landmass they are part of. The climate of a coastal region in one part of the world can be much colder or warmer than one in another part, especially at different latitudes.   

4) Coastal Fog

Fog often occurs at the coast, especially during the spring and summer. It is not always formed in the same way everywhere, but in most cases, it is as a result of the process described below. 

This type of fog usually occurs when moist warm air comes in contact with the cold water at the surface of the ocean. As the air temperature drops to below dew point, condensation takes place, and fog forms over the water.

Very often, prevailing winds (like sea breezes) can carry fog inland and create hazardous conditions for motorists. On sunny days, the fog tends to “burn way” as the day progresses. 

As I said, there are different conditions responsible for creating fog on the coast. For example, San Francisco is notorious for its cold foggy weather. In the summer, Northern California can very hot, creating low-pressure systems over land.

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Since San Francisco is surrounded by water on three sides, the moist & cold high-pressure air from the sea can quickly move into this low-pressure area over land, creating the dense fog the city is so famous for.

5) Higher Rainfall Than Inland Areas

Coastal regions normally have higher average rainfall than inland areas. It may seem obvious since a large body of water and moisture is present at the coast. It is not always that simple, as moist warm air must cool down sufficiently to condensate and form precipitation.

Two factors help this process along.

  • Cold Land Temperatures
  • Mountainous Terrain

During the winter, the land cools off and reaches lower temperatures than during the summer. This allows the air above it to cool down more as well. When the moist air from the sea comes in contact with the cold air over land, condensation will take place much easier.

which of the following best explains moderate coastal climates?
which of the following best explains moderate coastal climates?

Why do coastal regions experience moderate climate?

Coastal areas have moderate temperature because the land absorbs and radiates heat much faster than sea. So, during the day cool air from sea rush towards the land and during night cool air from the land rush towards sea. The specific heat capacity of water is very high. It is about five times as high as that of sand. Hence the heat energy required for the same rise in temperature by a certain mass of water will be nearly five times than that required by the same mass of sand. Similarly, a certain mass of water will give out nearly five times more heat energy than that given by sand of the same mass for the same fall in temperature. As such, sand gets heated or cooled more rapidly as compared to water under the similar conditions. Thus a large difference in temperature is developed between the land and the sea due to which land and sea breezes are formed. These breezes make the climate near the sea shore moderate. 

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