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Difficulty: MediumClimatic Controls and World Climate Types

Two meteorological stations located at similar latitudes of approximately 55∘N55^\circ\text{N} display contrasting thermal characteristics throughout the year. Station X, situated on a western continental coast, records mild winters (3∘C3^\circ\text{C} average in January), cool summers (16∘C16^\circ\text{C} average in July), and an annual temperature range of 13∘C13^\circ\text{C}. Station Y, situated deep within the continental interior at the same latitude, records severe winters (−22∘C-22^\circ\text{C} average in January), warm summers (18∘C18^\circ\text{C} average in July), and an annual temperature range of 40∘C40^\circ\text{C}. Which climatic control is primarily responsible for the contrasting annual temperature ranges observed between these two stations?

  1. The differential heat capacities of land and water combined with ocean proximity and maritime windsAnswer
  2. B
    The seasonal latitudinal migration of the Intertropical Convergence Zone (ITCZ)
  3. C
    Significant variations in the annual angle of incidence of incoming solar radiation
  4. D
    The presence of cold ocean currents creating atmospheric inversion layers along continental interiors

Answer

The differential heat capacities of land and water combined with ocean proximity and maritime winds
The correct answer correctly identifies continentality versus maritime influence as the controlling factor. Water has a higher specific heat capacity and takes longer to heat and cool than land. Coastal areas exposed to onshore maritime air masses (like Station X) experience moderated annual temperatures with small temperature ranges. In contrast, landlocked areas (like Station Y) experience rapid heat gain in summer and rapid radiation cooling in winter, resulting in extreme annual temperature ranges.

Step-by-Step Solution

1
Analyze the given data and identify the variable being compared.
Station X and Station Y are at the same latitude (55∘N55^\circ\text{N}), eliminating latitudinal angle of solar incidence as a factor. Station X has a low annual temperature range (13∘C13^\circ\text{C}) while Station Y has a very high annual temperature range (40∘C40^\circ\text{C}).
Isolating latitude confirms that solar radiation intensity cannot explain the difference.
2
Evaluate the geographic positioning and thermal properties of land versus water.
Water has a higher specific heat capacity than land, heating and cooling much more slowly. Onshore winds carry maritime moderating influences over coastal Station X, keeping winters mild and summers cool.
Oceanic proximity buffers coastal regions from temperature extremes.
3
Determine the climatic control governing continental interior temperatures.
Station Y suffers from extreme continentality, where rapid heating of the landmass in summer and rapid heat loss in winter produce a massive annual thermal amplitude.
Continentality is the primary control responsible for large annual temperature ranges at high mid-latitudes.

Key Concept

Continentality and Maritime Influence on Annual Temperature Range
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Topics

Climatic Controls and World Climate Types

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