Results 81 to 90 of about 173,175 (225)

Triple Oxygen Isotope Compositions of Isotopic Reference Waters: Implications for VSMOW‐Scale and VSMOW–SLAP‐Scale Δ′17O Calibration

Geostandards and Geoanalytical Research, EarlyView.
Key Points Triple oxygen isotope ratios of two primary (VSMOW, SLAP) and twelve secondary water isotopic reference materials were precisely measured using BrF5 fluorination‐IRMS. The measured Δ'17OVSMOW value for SLAP (34 ± 6 per meg) demonstrates that VSMOW‐SLAP normalisation ensures interlaboratory comparability, but introduces systematic offsets for
Ryoji Tanaka, Andreas Pack, Tyler B. Coplen   +2 more
wiley   +1 more source

Geolocation reveals wintering sites of near‐extinct Caucasian breeding sea duck

Ibis, EarlyView.
We obtained 14 sets of full annual cycle geolocator tracks from 13 individual nesting female Velvet Scoter Melanitta fusca from the relict Caucasian population at their last remaining breeding site, Lake Tabatskuri, Georgia. Results showed that females wintered at widespread discrete localities in Ukraine, around the coasts of the Crimean Peninsula and
Nika Paposhvili, Heidi Maria Thomsen, Ib Krag Petersen, Anthony D. Fox   +3 more
wiley   +1 more source

Shallow water modeling of Antarctic Bottom Water crossing the equator

Journal of Geophysical Research: Oceans, 2004
The dynamics of abyssal equator‐crossing flows are examined by studying simplified models of the flow in the equatorial region in the context of reduced‐gravity shallow water theory. A simple “frictional geostrophic” model for one‐layer cross‐equatorial flow is described, in which geostrophy is replaced at the equator by frictional flow down the ...
Choboter, Paul F., Swaters, Gordon E.
openaire   +3 more sources

Impact of Weddell Sea shelf progradation on Antarctic bottom water formation during the Miocene

, 2017
The Weddell Sea is a main location of bottom water formation and, thus, an important component of global ocean circulation. In this study we examine the ocean and climatic responses to a shelf progradation induced by ice sheet advance and glacially ...
Xiaoxia Huang, Michael Stärz, K. Gohl, G. Knorr, G. Lohmann   +4 more
semanticscholar   +1 more source

Distribution and ecology of the four Macrourus species by‐caught in the longline fishery at South Georgia, Southern Ocean

Journal of Fish Biology, EarlyView.
Abstract Although Macrourus species are the main by‐catch across Southern Ocean longline fisheries, including around South Georgia, the lack of species‐specific data has hindered effective management and ecological understanding. Aggregation of macrourids at genus level masks critical interspecific differences in life‐history strategies and ...
José Abreu, Philip R. Hollyman, Jennifer J. Freer, M. L. Romero Martínez, José P. Queirós, Timothy Jones, Richard A. Phillips, José C. Xavier, Martin A. Collins   +8 more
wiley   +1 more source

Report on field research of the Spanish Antarctic Campaign 2014/15: a cooperative international research project with the 56th Japanese Antarctic Research Expedition

Antarctic Record, 2015
A study on the limnological and ecological characteristics of maritime Antarctic lakes on Byers Peninsula, Livingstone Island, South Shetland Islands, West Antarctica, was conducted by the Spanish Antarctic Research Campaign during the 2014/15 season, in
Sakae Kudoh, Yukiko Tanabe
doaj   +1 more source

Divergent exploratory‐avoidant behavioural strategies may drive niche differentiation in juvenile Antarctic fishes

Journal of Fish Biology, EarlyView.
Abstract We used an ecological niche theory framework integrating physiological and behavioural ecology to understand interspecific differentiation of juveniles of four Antarctic fishes: Trematomus bernacchii, Trematomus pennellii, Trematomus nicolai and Pagothenia borchgrevinki.
Amanda J. Frazier, Andrew W. Naslund, Milica Mandic, Kenneth W. Zillig, Bryant C. Siu, Anne E. Todgham   +5 more
wiley   +1 more source

The Observed Circumpolar Decline of Antarctic Bottom Water Volume

Geophysical Research Letters
Antarctic Bottom Water (AABW) formation is a key component of the global overturning circulation, ventilating the abyssal ocean and sequestering heat and carbon.
James Wyatt, Nathaniel L. Bindoff, Annie Foppert, Helen Phillips, Stephen R. Rintoul   +4 more
doaj   +1 more source

Estimating Patagonian toothfish (Dissostichus eleginoides) length at first maturity from their age, sex and temperature experience around South Georgia

Journal of Fish Biology, EarlyView.
Abstract Patagonian toothfish (Dissostichus eleginoides) are a long‐lived, slow‐growing deep‐sea species endemic to the Southern Hemisphere and the focus of longline fisheries managed to ensure sustainable exploitation. Managing the fisheries relies on accurate stock assessments that include pertinent biological and exploitation processes.
Jessica E. Marsh, Sarah R. Alewijnse, Stephen D. Gregory, Philip R. Hollyman, Marta Söffker   +4 more
wiley   +1 more source

Centric diatom communities found in the Antarctic sea ice

Antarctic Record, 1982
It has been generally accepted that the ice algal communities are dominated by pennate diatoms in the Arctic and Antarctic seas. However, two ice algal communities found near the Antarctic Continent were dominated by centric diatoms.
Kentaro Watanabe
doaj   +1 more source