Oceanography: Exploring Earth’s Final Wilderness

Overview

Course No. 1730

Probe the ocean depths in this intriguing course that explores what we know about the world’s oceans from the tidal zones to the deepest points on the ocean floor. Oceanography: Exploring Earth’s Final Wilderness takes you on a scientific expedition to fathom the ocean’s mysteries. These 36 intensively illustrated half-hour lectures are delivered by ocean scientist and Professor Harold J. Tobin of the University of Wisconsin–Madison, a researcher who has visited and mapped landscapes on the seabed that no human eyes had ever seen before.

Oceanography encompasses a wide range of fields, from biology and ecology to geology, meteorology, chemistry, physics, and ocean engineering. No background in science is needed to follow these lectures, which provide a thorough appreciation for the ocean as a system that is arguably more intricate and fascinating than the continents, not least because it is a world that is fully three-dimensional, from the tidal zone to the deepest point on the ocean floor.

Video Lectures

01: Diving In-The Ocean Adventure

Begin your study of the ocean from every angle, examining Earth’s watery realm in light of geology, biology, chemistry, meteorology, and other fields. In this lecture, survey the extent of the ocean and the approaches that oceanographers take to understanding it.

Duration: 31 min

02: Explorers, Navigators, Pioneering Scientists

The early explorers of the ocean were interested in charting its islands, dimensions, and resources—and in using it as a highway for trade. Relive the exploits of these mariners, who included Europeans, Chinese, and Polynesians. Only later did scientific exploration of the ocean begin.

Duration: 33 min

03: Ocean Basics and Ocean Basins

As recently as the 1950s, geologists envisioned the ocean basins as a submerged version of the continents. Explore the topography of the seabed, discovering that it is shaped by geological forces fundamentally different from those on land.

Duration: 32 min

04: Mapping the Sea-Soundings to Satellites

The ocean floor was once as mysterious as the surface of another planet. Investigate the technologies involved in measuring bathymetry, the undersea counterpart of topography. Weighted ropes and cables for gauging the depth of the sea have given way to sophisticated sonar from ships and radar from satellites.

Duration: 34 min

05: Habitats-Sunlit Shelves to the Dark Abyss

Take a tour of organisms that live from the shallows to the ocean floor. Learn how to classify ocean zones, and discover the importance of temperature, chemistry, nutrients, light, and other factors for different life forms—from active swimmers to passive floaters and bottom dwellers.

Duration: 32 min

06: The Spreading Sea Floor and Mid-Ocean Ridges

What made the ocean floor the way it is? Trace the evidence that ocean basins are geologically young and that new oceanic crust is being continually formed at mid-ocean ridges, pushing and rifting continental plates in a process called plate tectonics.

Duration: 33 min

07: The Plunging Sea Floor and Deep-Sea Trenches

Investigate subduction zones, where oceanic crust plunges beneath an overriding tectonic plate. These margins are associated with deep-sea trenches, earthquakes, tsunamis, and volcanoes. Examine other features, such as hotspots, which are a mid-plate phenomenon that includes the Hawaiian Islands chain.

Duration: 32 min

08: The Formation of the Earth and Its Ocean

Cover 9 billion years of cosmic history—from the big bang to the accretion of the sun and planets, to the formation of Earth’s oceans 4 billion years ago. The water in the oceans came from water vapor in volcanic eruptions and possibly from comet impacts.

Duration: 30 min

09: The Early Ocean and the Origins of Life

Explore scenarios for the origin of life, which may have begun around deep-sea hot springs. The oceans have maintained roughly the same conditions over the entire history of life on Earth, even though the sea floor has renewed itself many times over through plate tectonics.

Duration: 34 min

10: Marine Sediments-Archives of the Ocean

Ocean sediments are like tree rings that can be “read” as a history of the ocean and climate through time. Investigate the different sources of sediments, which range from products of erosion on land to the remains of sea creatures to ejecta from asteroid impacts.

Duration: 31 min

11: Offshore Oil and Gas-Resources and Risks

Learn the origin of petroleum and natural gas deposits, which formed under very specific conditions in marine sediments. As an example of the challenges of oil recovery, survey the technology of deep-water drilling, focusing on the disastrous blow-out in the Gulf of Mexico in 2010.

Duration: 34 min

12: The Enduring Chemistry of Seawater

Why is the sea salty? Why isn’t it getting saltier? Probe these and other mysteries of ocean chemistry, looking at the remarkable stability and uniformity of seawater over time. Also study the role of water and the conjectured role of life in driving plate tectonics.

Duration: 30 min

13: How the Physics of Water Controls the Ocean

Analyze the surprising properties that keep the ocean liquid and make water the defining physical substance for life. Among them is its ability to retain heat, which has kept Earth in a narrow temperature range hospitable to life for billions of years. Also investigate the propagation of light in water and why the ocean is blue.

Duration: 32 min

14: Waves-Motion in the Ocean

Chart the dynamics of wind-generated waves, which include almost all ocean waves. See how they form, grow in size, travel for thousands of miles, and then break on shore. The big waves preferred by surfers come from remote regions that have the ocean’s stormiest weather.

Duration: 30 min

15: Rogue Waves and Tsunami

Long considered a mariners’ tall tale, abnormally high “rogue” waves are now well documented. Understand the physics of why they form and the yearly toll they take on shipping. Then study tsunami, or seismic sea waves, which are generated when undersea earthquakes displace huge volumes of water, often with catastrophic results.

Duration: 32 min

16: Tides in Theory and Practice

Tides are caused by the gravitational attraction of the moon and, to a lesser extent, the sun. Learn that the timing and height of tides are far more complex than the daily motions of the moon and sun suggest—due to the influences of coastal features, the Coriolis effect, and other factors.

Duration: 30 min

17: Marine Life, Energy, and Food Webs

Trace the path of energy and food through oceanic ecosystems, which have a far higher turnover of biomass than the terrestrial equivalents. As a result, most of what grows in the oceans is very quickly consumed. Learn why warm, temperate seas are often nutrient-poor compared with polar waters.

Duration: 34 min

18: Tiny Plankton-The Most Abundant Life on Earth

Survey some of the many species of plankton, which are passive, floating, and drifting organisms. Microscopic plankton are ubiquitous throughout the oceans and represent all three of the basic biological domains: Archaea, Bacteria, and Eukarya.

Duration: 31 min

19: Soft-Bodied Life in the Dark, Open Depths

Investigate the soft-bodied organisms that live at great depths and have no skeletons or shells. Little known until recently, this group includes a variety of creatures whose amorphous bodies are often destroyed by nets and who only came to light through studies from submersibles.

Duration: 33 min

20: Swimming-The Many Fish in the Sea

Contrasting with free-floating plankton, nekton are the ocean’s swimmers. In this lecture, study the most numerous nekton—fish—focusing on their streamlining, gills, schooling, and other adaptations. Also, examine mollusks, including the octopus, squid, and nautilus.

Duration: 34 min

21: Marine Birds, Reptiles, and Mammals

Turn to the nekton among birds, reptiles, and mammals. These feature some of the most magnificent creatures on the planet, including albatrosses, Sooty Shearwaters, sea turtles, manatees, seals, sea lions, whales, and dolphins. Focus on the adaptations that allow them to thrive in marine environments.

Duration: 34 min

22: Whaling, Fisheries, and Farming the Ocean

Examine the economic exploitation of marine life, beginning with the history of whaling and continuing to the present, when fishing is the only significant source of hunted food. Weigh the alternatives of commercial fishing and mariculture in an era of rapidly declining fish populations.

Duration: 34 min

23: Where Sea Meets the Land and Why Coasts Vary

Have you ever walked along a beach or stood on a high cliff overlooking the sea and wondered how the land got to be that way? Learn how erosion, deposition, sea-level change, plate tectonics, and other factors have produced the characteristic coastlines of the world.

Duration: 32 min

24: Where Rivers Meet the Sea – Estuaries and Deltas

River mouths, deltas, tidal inlets, fjords, and enclosed bays are places where freshwater and seawater mix. Explore these complex zones, which are among the most biologically productive ecosystems on Earth. Many marine organisms carry out key parts of their lifecycles in such environments.

Duration: 30 min

25: Coastal Erosion-Beaches and Sea Cliffs

Coastlines are constantly changing features. Examine what happens when structures are built to halt or reverse the change, especially at a time when sea level is rising. Most human-engineered solutions turn out to be short-term at best, and many have unintended consequences.

Duration: 31 min

26: Tidal Life, Sea Forests, and Coral Reefs

Begin your survey of the organisms and ecosystems that flourish in the most complex and varied part of the ocean: the benthic zone, or sea bottom. Start in the shallows, where life inhabits a wide range of niches—from the crashing waves of tide pools to placid mudflats.

Duration: 32 min

27: Deep Bottom Life and Hydrothermal Vents

Continue your investigation of the benthic zone by exploring the deep ocean bottom, where astonishing diversity exists in cold, darkness, and high pressure. Your tour includes sea cucumbers, brittle stars, herds of sea pigs, and the unique community around deep sea vents, which extracts energy from the Earth itself.

Duration: 32 min

28: Trade Winds-The Circulation of Heat and Wind

Explore another ocean—the ocean of air—which interacts with Earth’s seas through the force of wind on water. Investigate the cause of wind patterns such as the trade winds, westerlies, and polar easterlies. Two crucial factors are uneven distribution of heat and the Coriolis effect due to Earth’s rotation.

Duration: 28 min

29: Heavy Weather-Storms and Hurricanes

Gain insight into the world’s largest storms by looking at the interaction of ocean, atmosphere, and land, and how it produces nor’easters, monsoons, and hurricanes. Focus on the life cycle of hurricanes—how they form, intensify, and often produce devastating storm surges, as happened during Hurricane Katrina.

Duration: 34 min

30: The Gulf Stream to Gyres-Vast Surface Currents

Follow the chain of events that initiate surface currents in the ocean. Big currents such as the Gulf Stream are caused mainly by wind friction. The mapping of currents has been aided by incidents such as the accidental spill of thousands of floating bath toys in the Pacific in 1992.

Duration: 32 min

31: Upwelling, Downwelling, and El Niño

Winds drive surface currents, and together wind and currents set in motion large-scale upwelling and downwelling. Study these patterns and the disturbances that lead to El Niño and La Niña cycles, which cause major disruptions in fisheries and weather.

Duration: 32 min

32: The Deepest, Slowest River-Polar Bottom Water

While surface currents move a typical water molecule around an ocean basin in a year or two, down deep water circulates much more slowly, taking hundreds to thousands of years to make a circuit. Trace how dense, cold water masses from the polar regions slowly but inexorably move the great bulk of the ocean.

Duration: 32 min

33: The Ocean and Global Climate

The ocean contains most of the heat in the ocean-atmosphere system, and surface currents distribute it around the planet. Begin your study of the ocean’s reaction to increasing carbon dioxide in the atmosphere, which is leading to climate change worldwide.

Duration: 32 min

34: The Warming, Rising Sea

Learn that one conjectured effect of global warming—the shutting down of the Gulf Stream leading to a new ice age in Europe—is unlikely. But the planet is already on a path to melting glaciers and steadily rising seas, with catastrophic implications for low-lying populated areas.

Duration: 34 min

35: Marine Pollution-The Impact of Toxins

Turn to the problem of marine pollution, which includes runoff from land and deliberate dumping, in addition to acidification from atmospheric carbon dioxide. Also look at the Great Pacific Garbage Patch, where plastic particles and other debris have concentrated in a rotating mid-ocean current.

Duration: 34 min

36: The Future Ocean

Finish the course by looking into the future. Constant change will continue to be the state of the ocean, just as it always has been. But humans can promote change for the better in a variety of ways, including using the national park model to establish marine sanctuaries. Learn other choices you can make to help preserve this wonder of the planet.

Duration: 36 min