Biomes and Oceanic Currents Study Guide

Characteristics of Tropical Zones

Tropical zones are located between the latitudes of $0^\circ$ and $23.5^\circ$ North or South of the equator. These regions are characterized by consistently hot temperatures throughout the entire year. They receive a significant amount of rainfall, which contributes to their unique seasonal cycle. Unlike other regions with more varied seasonal changes, tropical zones typically experience only two distinct seasons: the wet season and the dry season.

Characteristics of Temperate Zones

Temperate zones are situated between the latitudes of $23.5^\circ$ and $66.5^\circ$ in both the Northern and Southern Hemispheres. These areas are generally cooler than the tropical zones and receive less overall rainfall. A defining feature of temperate zones is the presence of four distinct seasons. Geographic examples of regions located within these temperate zones include Myanmar and Europe.

Arctic and Antarctic Circles

The Arctic and Antarctic Circles are found at the high latitudes between $66.5^\circ$ and $90^\circ$ North or South. These regions are defined by extreme cold and a unique seasonal pattern consisting of only two seasons: day and night. The imaginary lines at $66.5^\circ$ mark the formal beginning of the Arctic region in the north and the Antarctic region in the south. Norway serves as a specific geographical example of a country within these high-latitude regions.

Impact of Warm and Cool Oceanic Currents

Oceanic currents play a significant role in determining the climate and biological productivity of coastal areas. Warm currents function by bringing heat from the equator toward the coastlines. This influx of heat causes the coastline temperatures to warm up, which creates an environment that encourages more life to grow and thrive in those regions.

Cool currents, conversely, bring cold water from the Arctic and Antarctic circles toward other regions. As these currents move, they scrape the bottom of the ocean. This process is beneficial because it brings more mineral wealth from the ocean floor to the coastline, enriching the local marine ecosystem with essential nutrients.