نتایج جستجو برای: oceanic

تعداد نتایج: 14084  

Journal: :Oceanography 2007

2015
Hisashi UTADA

Electromagnetic exploration is a geophysical method for examining the Earth's interior through observations of natural or artificial electromagnetic field fluctuations. The method has been in practice for more than 70 years, and 40 years ago it was first applied to ocean areas. During the past few decades, there has been noticeable progress in the methods of instrumentation, data acquisition (o...

Journal: :Nature 1895

2000
Angela Terrill Ger Reesink Edgar Suter

The Papuan-Oceanic world has long been considered a hotbed of contactinduced linguistic change, and there have been a number of studies of deep linguistic influence between Papuan and Oceanic languages (like those by Thurston and Ross). This paper assesses the degree and type of contactinduced language change in the Solomon Islands, between the four Papuan languages—Bilua (spoken on Vella Lavel...

2009
Junichi Nakajima Yusuke Tsuji Akira Hasegawa

[1] We perform travel-time tomography to estimate detailed seismic velocity structures in the crust of the Pacific slab from northeastern (NE) Japan to the Kanto district, Japan, and reveal that the depth extent of the low-velocity (hydrated) oceanic crust varies along the arc. The low-velocity oceanic crust is subducting to depths of 120–150 km beneath Kanto, which is 40–70 km deeper compared ...

2007
Barry F. Sherr

extraordinary species diversity and variety of interactions of protists in the sea are only now being fully appreciated. Figure 1 shows representative examples of marine protists, and of methods used to visualize these microbes. Protists can be autotrophic or heterotrophic. The former, also called microscopic algae, contain chloroplasts, thrive by photosynthesis, and are at the base of all ocea...

2015
Rong Wang Yves Balkanski Laurent Bopp Olivier Aumont Olivier Boucher Philippe Ciais Marion Gehlen Josep Peñuelas Christian Ethé Didier Hauglustaine Bengang Li Junfeng Liu Feng Zhou Shu Tao

Satellite data and models suggest that oceanic productivity is reduced in response to less nutrient supply under warming. In contrast, anthropogenic aerosols provide nutrients and exert a fertilizing effect, but its contribution to evolution of oceanic productivity is unknown. We simulate the response of oceanic biogeochemistry to anthropogenic aerosols deposition under varying climate from 185...

صلواتی, مژگان, کنعانیان , علی , زعیمنیا, فاطمه , صمدی صوفی, علیرضا ,

The Southern Caspian Sea ophiolite complex (SCO) is one of the Late Cretaceous discontinuous oceanic lithosphere remnants in northern Iran. These complex is almost a complete sequence from bottom to top, ultramafic cumulates, layered gabbros, isotropic gabbros, dike complex and basaltic lavas which is covered by Late Cretaceous (Companion- maaestirchtian) pelagic limestone. Crustal ultramafic c...

2008
Sylvain Bonhommeau Emmanuel Chassot Benjamin Planque Etienne Rivot Anthony Knap Olivier Le Pape

Glass eel abundances are declining worldwide. This has mostly been attributed to direct impacts of human activities such as overfishing or habitat loss and degradation, whilst the potential influence of changes in oceanic conditions has received less attention. Eel are characterized by a complex and still enigmatic life cycle that includes a trans-oceanic spawning and larval migration. The appa...

Study of the beam propagation behavior through oceanic media is a challenging subject. In this paper, based on generalized Collins integral, the mean irradiance profile of Gaussian laser beam propagation through ocean is investigated. Power In Special Bucket (PIB) is calculated. Using analytical expressions and calculating seawater transmission, the effects of absorption and scattering on beam ...

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