Examkin

Soru

Zorluk: ZorClimate and Climatic Regions of Nigeria

During the Northern Hemisphere winter (December to January), meteorological records show that Maiduguri experiences a mean diurnal temperature range exceeding 15∘C15^\circ\text{C}, whereas Calabar records a diurnal temperature range of less than 6∘C6^\circ\text{C}. Which of the following atmospheric mechanisms is primarily responsible for this spatial variation in daily thermal range across Nigeria?

  1. The dominance of the dry Continental Tropical (cT) air mass over northern Nigeria, resulting in low cloud cover that promotes high daytime insolation and rapid nighttime terrestrial radiation loss.Cevap
  2. B
    The influence of the moist Maritime Tropical (mT) air mass over Maiduguri during winter, which creates dense cloud cover that traps daytime heat and elevates nighttime humidity.
  3. C
    The northernmost migration of the Inter-Tropical Discontinuity (ITD), which brings widespread convective rainfall and thick cloud cover to the Sahelian zone.
  4. D
    The effect of warm ocean currents along the Calabar coast, which dramatically raise daytime temperatures while suppressing nighttime temperatures.

Cevap

The dominance of the dry Continental Tropical (cT) air mass over northern Nigeria, which creates cloudless skies that maximize daytime solar heating and accelerate nocturnal terrestrial radiation loss, thereby widening the diurnal temperature range.
During the dry season (December–January), northern Nigeria (Maiduguri) is governed by the Continental Tropical (cT) air mass originating from the Sahara Desert. The low relative humidity and cloudless skies allow high daytime solar heating and intense radiative cooling at night, resulting in a large diurnal temperature range. Conversely, southern coastal locations (Calabar) experience high moisture levels and cloud cover from the Maritime Tropical (mT) air mass, which moderates thermal fluctuations.

Adım Adım Çözüm

1
Analyze the climatic characteristics of the two stations during December–January.
Maiduguri (located in the northern interior Sahel/Sudan belt) is dominated by dry North-East Trade Winds (cT air mass), whereas Calabar (located on the southern coast) remains under the moist influence of South-West Trade Winds (mT air mass).
Air mass dominance during the Northern Hemisphere winter determines cloud cover and atmospheric humidity levels across Nigeria.
2
Examine the effect of relative humidity and cloud cover on energy balance.
Low atmospheric moisture and clear skies over Maiduguri allow maximum solar radiation during the day and rapid escape of longwave terrestrial radiation at night. In Calabar, high relative humidity and cloud cover trap radiation, keeping diurnal temperature fluctuations small.
Water vapor and clouds act as a greenhouse blanket, suppressing nocturnal cooling and stabilizing daily temperatures.
3
Identify the primary mechanism explaining the contrasting diurnal ranges.
The wide diurnal temperature range in the north during the dry season is directly caused by cT air mass dominance and resultant cloudless atmospheric conditions.
Radiative cooling under clear, arid air mass regimes produces large day-to-night temperature differences.

Anahtar Kavram

Air Mass Dynamics and Diurnal Temperature Range Variations in Nigerian Climatic Zones
Bu soruyu puanla

Konular

Climate and Climatic Regions of Nigeria

Bu konudan daha fazla soru