Results 121 to 130 of about 4,509,711 (135)

Seismic Evidence for Sharp Lithosphere-Asthenosphere Boundaries of Oceanic Plates

Science, 2009
Detection of the presence of melt at variable depth beneath two oceanic plates reveals the vertical extent of old oceanic plates. Boundary Issues of the Lithosphere The depth of Earth's tectonic plates is defined by the lithosphere-aesthenosphere ...
H. Kawakatsu, Prakash Kumar, Y. Takei, M. Shinohara, T. Kanazawa, E. Araki, K. Suyehiro   +6 more
semanticscholar   +1 more source

Deep Mantle Cycling of Oceanic Crust: Evidence from Diamonds and Their Mineral Inclusions

Science, 2011
Tiny minerals trapped inside Brazilian diamonds show that Earth’s carbon cycle extends down to the lower mantle. A primary consequence of plate tectonics is that basaltic oceanic crust subducts with lithospheric slabs into the mantle.
M. Walter, S. Kohn, D. Araújo, G. Bulanova, Christopher B. Smith, E. Gaillou, Jianhua Wang, A. Steele, S. Shirey   +8 more
semanticscholar   +1 more source

The oceanic vertical pump induced by mesoscale and submesoscale turbulence.

Annual Review of Marine Science, 2009
The motivation to study the vertical exchanges of tracers associated with mesoscale eddies is that the mean concentration of most oceanic tracers changes rapidly with depth.
P. Klein, G. Lapeyre
semanticscholar   +1 more source

Changing perspectives in marine nitrogen fixation

Science, 2020
Changing views and a changing ocean As a component of many biomolecules, nitrogen is a crucial element for life, especially in nutrient-poor environs such as the open ocean.
J. Zehr, D. Capone
semanticscholar   +1 more source

Global Observations of Oceanic Rossby Waves

Science, 1996
Rossby waves play a critical role in the transient adjustment of ocean circulation to changes in large-scale atmospheric forcing. The TOPEX/POSEIDON satellite altimeter has detected Rossby waves throughout much of the world ocean from sea level signals ...
D. Chelton, M. Schlax
semanticscholar   +1 more source

A simple predictive model for the structure of the oceanic pycnocline

Science, 1999
A simple theory for the large-scale oceanic circulation is developed, relating pycnocline depth, Northern Hemisphere sinking, and low-latitude upwelling to pycnocline diffusivity and Southern Ocean winds and eddies.
A. Gnanadesikan
semanticscholar   +1 more source

Globally Distributed Uncultivated Oceanic N2-Fixing Cyanobacteria Lack Oxygenic Photosystem II

Science, 2008
Biological nitrogen (N2) fixation is important in controlling biological productivity and carbon flux in the oceans. Unicellular N2-fixing cyanobacteria have only recently been discovered and are widely distributed in tropical and subtropical seas ...
J. Zehr, S. Bench, Brandon J. Carter, I. Hewson, Faheem Niazi, Tuo Shi, H. J. Tripp, J. Affourtit   +7 more
semanticscholar   +1 more source

Beyond the Calvin cycle: autotrophic carbon fixation in the ocean.

Annual Review of Marine Science, 2011
Organisms capable of autotrophic metabolism assimilate inorganic carbon into organic carbon. They form an integral part of ecosystems by making an otherwise unavailable form of carbon available to other organisms, a central component of the global carbon
Michael Hügler, S. Sievert
semanticscholar   +1 more source

Oceanic Primary Production: Estimation by Remote Sensing at Local and Regional Scales

Science, 1988
Satellites provide the only avenue by which marine primary production can be studied at ocean-basin scales. With maps of chlorophyll distribution derived from remotely sensed data on ocean color as input, deduction of a suitable algorithm for primary ...
T. Platt, S. Sathyendranath
semanticscholar   +1 more source

The geologic history of seawater pH

Science, 2017
The long view of ocean pH The acid-base balance of the oceans has been critical in maintaining Earth's habitability and allowing the emergence of early life. Despite this importance, systematic estimates of historical seawater pH are lacking.
I. Halevy, A. Bachan
semanticscholar   +1 more source