- 1 What wind direction causes upwelling?
- 2 What direction is upwelling?
- 3 What direction does the wind push the ocean?
- 4 Why is there shallow and wind driven oceanic upwelling at the equator?
- 5 What causes Ekman spirals?
- 6 Which event causes upwelling?
- 7 What are 3 areas of upwelling in the world?
- 8 Does El Nino cause upwelling?
- 9 What three types of fish are found almost entirely in upwelling regions?
- 10 Why is the Coriolis force to the left in the southern hemisphere?
- 11 Why is there always wind at the beach?
- 12 What would happen if ocean circulation stopped?
- 13 How does Ekman cause downwelling?
- 14 What can prevent upwelling?
- 15 What causes Ekman transport?
What wind direction causes upwelling?
Upwelling occurs along west coasts in the Northern Hemisphere when the wind direction is from the north because the net transport of near-surface water is away from shore. Winds from the south cause upwelling along east coasts in the Northern Hemisphere.
What direction is upwelling?
Upwelling is most common along the west coast of continents (eastern sides of ocean basins). In the Northern Hemisphere, upwelling occurs along west coasts (e.g., coasts of California, Northwest Africa) when winds blow from the north (causing Ekman transport of surface water away from the shore).
What direction does the wind push the ocean?
The winds pull surface water with them, creating currents. As these currents flow westward, the Coriolis effect—a force that results from the rotation of the Earth—deflects them. The currents then bend to the right, heading north.
Why is there shallow and wind driven oceanic upwelling at the equator?
The Coriolis effect also causes upwelling in the open ocean near the Equator. Trade winds at the Equator blow surface water both north and south, allowing upwelling of deeper water.
What causes Ekman spirals?
The Ekman spiral, named after Swedish scientist Vagn Walfrid Ekman (1874-1954) who first theorized it in 1902, is a consequence of the Coriolis effect. When surface water molecules move by the force of the wind, they, in turn, drag deeper layers of water molecules below them.
Which event causes upwelling?
Conditions are optimal for upwelling along the coast when winds blow along the shore. Winds blowing across the ocean surface push water away. Water then rises up from beneath the surface to replace the water that was pushed away. This process is known as “upwelling.”
What are 3 areas of upwelling in the world?
Worldwide, there are five major coastal currents associated with upwelling areas: the Canary Current (off Northwest Africa), the Benguela Current (off southern Africa), the California Current (off California and Oregon), the Humboldt Current (off Peru and Chile), and the Somali Current (off Somalia and Oman).
Does El Nino cause upwelling?
America to Asia/Australia, and warm surface water is dragged away from the coast and colder, nutrient water rises to shallow depths. During El Niño, the trade winds are very weak and upwelling doesn’t happen.
What three types of fish are found almost entirely in upwelling regions?
What three types of fish are found almost entirely in upwelling regions? Herring, anchovy, and sardines, three of the most widely harvested fish, are especially concentrated in upwelling zones. Such sea life is an increasingly large component of man’s food supply.
Why is the Coriolis force to the left in the southern hemisphere?
Because the Earth rotates on its axis, circulating air is deflected toward the right in the Northern Hemisphere and toward the left in the Southern Hemisphere. This deflection is called the Coriolis effect. But because the Earth rotates, circulating air is deflected.
Why is there always wind at the beach?
The ocean heats up much slower and becomes relatively cooler than the beach making it a high pressure zone. The air moves from the water to the land each morning forming a sea breeze. These pressure zones might equal out later in the day and the winds may diminish. A sea breeze blows from the ocean towards the beach.
What would happen if ocean circulation stopped?
The ocean currents carry warmth from the tropics up to these places, which would no longer happen. If the currents were to stop completely, the average temperature of Europe would cool 5 to 10 degrees Celsius. There would also be impacts on fisheries and hurricanes in the region.
How does Ekman cause downwelling?
As wind blows along a coastline, Ekman transport moves the surface layer in a direction 90o to the wind. In any coastal upwelling location, if the winds reverse, surface water moves towards the shore and downwelling is the result.
What can prevent upwelling?
Upwellings are caused when wind blows the surface water away from the coast. This causes the cold, deep water to move up toward the surface. El Niño can prevent upwelling along the Pacific Coast.
What causes Ekman transport?
Ekman transport occurs when ocean surface waters are influenced by the friction force acting on them via the wind. As the wind blows it casts a friction force on the ocean surface that drags the upper 10-100m of the water column with it.