Ocean currents - National Oceanic and Atmospheric Administration
2011年8月1日 · Deep ocean currents Differences in water density, resulting from the variability of water temperature ( thermo ) and salinity ( haline ), also cause ocean currents. This process is known as thermohaline circulation.
What are Ocean Currents? | Every Full Moon | Ocean Today
This is ocean current. The reason we have currents in the ocean is a bit more complicated. Let's go back to the shoreline to witness one cause of ocean currents. Tides. 1. Tidal Currents. Tidal currents are strongest near the shore, in bays, and in estuaries along our coasts. This illustration will give you an idea of how this works.
Ocean Circulations - National Oceanic and Atmospheric …
2023年3月28日 · This upwelling is relatively widespread. However, water samples taken around the world indicate that most of the upwelling takes place in the North Pacific Ocean. It is estimated that once the water sinks in the North Atlantic Ocean, it takes 1,000-1,200 years before that deep, salty bottom water rises back to the upper levels of the ocean again.
What causes ocean currents? - National Oceanic and Atmospheric ...
Currents may also be caused by density differences in water masses due to temperature (thermo) and salinity (haline) variations via a process known as thermohaline circulation. These currents move water masses through the deep ocean, taking nutrients, oxygen, and heat with them.
Ocean motion: Wind-driven currents - National Oceanic and …
2024年10月18日 · Earth’s rotation results in the Coriolis Effect which also influences ocean currents. Large-scale, surface ocean currents are driven by global wind systems that are fueled by energy from the sun. These currents transfer heat from the tropics to the Polar Regions, influencing local and global climate. Materials. Deep clear pan, or tub
Currents: NOAA's National Ocean Service Education
A second factor that drives ocean currents is wind. Winds drive currents that are at or near the ocean's surface. These currents are generally measured in meters per second or in knots (1 knot = 1.15 miles per hour or 1.85 kilometers per hour). Winds drive currents near coastal areas on a localized scale, and in the open ocean on a global scale.
How do we monitor currents? - National Oceanic and Atmospheric ...
2024年6月16日 · Many oceanographers also use radio antennas and high frequency Radio Detecting and Ranging systems (radar) to measure surface ocean currents. Similar to the Acoustic Doppler Current Profiler, these shore-based instruments use the Doppler effect to determine when currents are moving toward or away from the shore or to measure the velocity …
Ocean floor features - National Oceanic and Atmospheric …
2020年5月1日 · This graphic shows several ocean floor features on a scale from 0-35,000 feet below sea level. The following features are shown at example depths to scale, though each feature has a considerable range at which it may occur: continental shelf (300 feet), continental slope (300-10,000 feet), abyssal plain (>10,000 feet), abyssal hill (3,000 feet up from the …
Layers of the Ocean - National Oceanic and Atmospheric …
2023年3月28日 · Three-quarters of the area of the deep-ocean floor lies in this zone. Hadalpelagic Zone The deepest zone of the ocean, the hadalpelagic zone extends from 6,000 meters (19,700 feet) to the very bottom, 10,994 meters (36,070 feet) in the Mariana Trench off the coast of Japan. The temperature is constant, at just above freezing.
Rip Currents - National Oceanic and Atmospheric Administration
2024年9月19日 · Rip currents are powerful, channeled currents of water flowing away from shore. They typically extend from the shoreline, through the surf zone, and past the line of breaking waves. Rip currents can occur at any beach with breaking waves, including the Great Lakes. Anatomy of the rip current. Download