Marine Geosciences / Oceanography Fields and disciplines
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1 Marine Geosciences / Oceanography Fields and disciplines Marine Geosciences; Oceanography Chemical Oceanography Marine chemistry; marine geochemistry Biological Oceanography Marine biology; marine biogeochemistry Marine ecology Physical Oceanography Ocean circulation & Climate (change) Dynamics of the ocean floor, Marine Geodynamics Marine Sedimentology
2 Chemical Oceanography Where do the elements on the seawater come from? 1. Weathering of continents delivered to the oceans by rivers (also dust blown material) 2. Hydrothermal alteration of the oceanic crust 3. Volcanic degassing
3 The oceans as a chemical system Processes along ocean floor and mid-ocean ridges Input: rivers: 18.3 x 10 9 tons/yr Glaciers und ice: 2.0 x 10 9 tons/yr Wind (dust particles): 0.6 x 10 9 tons/yr Hydrothermal alteration of the oceanic crust Quelle: Volcanic degassing Discharge: Sedimentation anorganic biological
4 Chemical Oceanography River water Sea water Georg Forchhammer ( ) Danish Mineralogist The quantity of different elements in seawater is not proportional to the quantity of elements which river water pours into the sea
5 Marine mass balances
6 Marine mass balances Magnesium problem units: g/yr Basalt-seawater interaction
7 Residence times in seawater of solutes
8 The blue planet Where did the water in the oceans come from? 1. Earth held onto some water when it formed. Some of that water has remained with the Earth, and might be recycled through the planet's mantle layer. 2. delivered after Earth formed by ice-rich asteroids (carbonaceous chondrites) or comets.
9 Example Physical Oceanography Side-scan sonar depicts the shape of the seafloor and objects on it
10 Research facilities for marine geosciences in Germany GEOMAR Helmholtz-Zentrum für Ozeanforschung Kiel from : IfM-GEOMAR MARUM Zentrum für marine Umweltwissenschaften, Bremen Alfred-Wegener-Institut Helmholtz-Zentrum für Polar- und Meeresforschung, Bremerhaven Max-Planck-Institut für marine Mikrobiologie, Bremen Institut für Meereskunde, Hamburg (focus on physical oceanography) Leibnitz-Institut für Ostseeforschung, Warnemünde (focus on shore lines and marginal basins)
11 Research facilities for marine geosciences in Germany
12 Research facilities for marine geosciences in Germany
13 Ocean bathymetry
14 Hypsometric curve
15 The Oceans Ocean Surface Area Water Volume Avg. Depth Max. Depth (million km 2 ) (million km 3 ) (km) (km) Pacific Atlantic Indian Arctic Pacific ocean: less than double size, but more than double volume compared to the Atlantic ocean
16 Continental Margins Continental Shelf Submerged part of the continent Gently sloping (less than 1 ) Up to 1500 km wide; averages 80 km wide Locally cut by canyons (eroded by rivers during the Ice age low sea level) Continental Slope Boundary between continental and oceanic crust Steeply sloping compared to shelf (averages about 5 slope, up to 25 ); about 20 km wide Continental Rise At base of continental slope; slope angle decreases Thick accumulation of sediment transported downslope from continental shelf At mouths of submarine canyons, deep-sea fans are present. May be carved by turbidity currents - bottom-currents carrying suspended sediment downslope
17 Submarine Canyons Submarine Canyons ( super-highways ) N cut into the seabed of the continental slope formation during lowstands of sea level Monterey Canyon Schelf und continental slope along California; source: USGS
18 Deep-sea fan large-scale sediment deposition sediments introduced through submarine canyons formed by turbidity currents examples: Amazonas fan; Bengal fan; Indus fan
19 Deep Ocean Basins Cover about 30% of Earth's surface Abyssal plains (Tiefseeboden) Flat, deep ocean floor Depth may be 3-5 km Sediments bury topography of oceanic crust Deep sea trenches (Tiefseerinnen) The deepest part of the oceans May exceed m deep Deepest is Mariana trench in Pacific Ocean (more than m) Occur at subduction zones where oceanic crust is forced downward into the mantle Mid-ocean ridges continuous range of undersea mountains winding through km of the world s oceans Seamounts Undersea volcanic peaks which formed along mid-ocean ridges or over hot spots May be eroded flat on top and called guyots May be ringed by coral reefs called atolls
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