Articles (in Journals, Reports etc) (IIOE-2)
http://hdl.handle.net/1834/17866
2024-03-29T06:58:41ZA Precambrian microcontinent in the Indian Ocean.
http://hdl.handle.net/1834/9692
A Precambrian microcontinent in the Indian Ocean.
Torsvik, Trond H.; Amundsen, Hans; Hartz, Ebbe H.; Corfu, Fernando; Kusznir, Nick; Gaina, Carmen; Doubrovine, Pavel V.; Steinberger, Bernhard; Ashwal, Lewis D.; Jamtveit, Bjørn
The Laccadive–Chagos Ridge and Southern Mascarene Plateau
in the north-central and western Indian Ocean, respectively,
are thought to be volcanic chains formed above the Réunion
mantle plume1 over the past 65.5 million years2,3. Here we use
U–Pb dating to analyse the ages of zircon xenocrysts found
within young lavas on the island of Mauritius, part of the
Southern Mascarene Plateau. We find that the zircons are
either Palaeoproterozoic (more than 1,971 million years old)
or Neoproterozoic (between 660 and 840 million years old).
We propose that the zircons were assimilated from ancient
fragments of continental lithosphere beneath Mauritius, and
were brought to the surface by plume-related lavas. We
use gravity data inversion to map crustal thickness and
find that Mauritius forms part of a contiguous block of
anomalously thick crust that extends in an arc northwards
to the Seychelles. Using plate tectonic reconstructions, we
show that Mauritius and the adjacent Mascarene Plateau may
overlie a Precambrian microcontinent that we call Mauritia.
On the basis of reinterpretation of marine geophysical data4,
we propose that Mauritia was separated from Madagascar
and fragmented into a ribbon-like configuration by a series of
mid-ocean ridge jumps during the opening of the Mascarene
ocean basin between 83.5 and 61 million years ago.We suggest
that the plume-related magmatic deposits have since covered
Mauritia and potentially other continental fragments.
2013-01-01T00:00:00ZNew Indian Ocean Program Builds on a Scientific Legacy.
http://hdl.handle.net/1834/9686
New Indian Ocean Program Builds on a Scientific Legacy.
Hood, R,R,; McPhaden, M.J.; Urban, E.
Prior to the International Geophysical Year
(1957–1958) and before the acceptance of
ideas about continental drift and the emergence
of the theory of plate tectonics, the
Indian Ocean was viewed as one of the last
great frontiers of Earth exploration. During
this post–World War II era, many new technologies
were emerging for sampling the ocean
and atmosphere and for mapping deep- ocean
topography. Yet fundamental descriptive work
still remained to be done on oceanic and
atmospheric circulation, marine geology, and
biological and ecological variability in the
Indian Ocean.
Motivated by these technological developments
and the opportunity to explore one of
the last great frontiers on Earth, the Scientific
Committee on Ocean Research (SCOR) and
the Intergovernmental Oceanographic Commission
(IOC) launched one of the greatest
oceanographic expeditions of all time: the
International Indian Ocean Expedition (IIOE).
An interdisciplinary endeavor embracing
physical oceanography, chemical oceanography,
marine biology, meteorology, and marine
geology and geophysics, IIOE was a monumental
mid- twentieth- century oceanographic
research program that conducted an unprecedented
number of hydrographic surveys
covering the entire Indian Ocean basin
2014-01-01T00:00:00ZPacific origin of the abrupt increase in Indian Ocean heat content during the warming hiatus. [and Supplementary Information]
http://hdl.handle.net/1834/9681
Pacific origin of the abrupt increase in Indian Ocean heat content during the warming hiatus. [and Supplementary Information]
Lee, Sang-Ki; Park, Wonsun; Baringer, Molly O.; Gordon, Arnold L.; Huber, Bruce; Liu, Yanyun
Global mean surface warming has stalled since the end of
the twentieth century1,2, but the net radiation imbalance
at the top of the atmosphere continues to suggest an
increasingly warming planet. This apparent contradiction has
been reconciled by an anomalous heat flux into the ocean3–8,
induced by a shift towards a La Niña-like state with cold
sea surface temperatures in the eastern tropical Pacific over
the past decade or so. A significant portion of the heat
missing fromthe atmosphere is therefore expected to be stored
in the Pacific Ocean. However, in situ hydrographic records
indicate that Pacific Ocean heat content has been decreasing9.
Here, we analyse observations along with simulations from
a global ocean–sea ice model to track the pathway of heat.
We find that the enhanced heat uptake by the Pacific
Ocean has been compensated by an increased heat transport
from the Pacific Ocean to the Indian Ocean, carried by
the Indonesian throughflow. As a result, Indian Ocean heat
content has increased abruptly, which accounts for more
than 70% of the global ocean heat gain in the upper 700m
during the past decade. We conclude that the Indian Ocean
has become increasingly important in modulating global climate variability.
2015-01-01T00:00:00ZIndian Ocean - RAMA Research Moored Array for African-Asian-Australian Monsoon Analysis and Prediction: Journal publications. [Webpage]
http://hdl.handle.net/1834/9679
Indian Ocean - RAMA Research Moored Array for African-Asian-Australian Monsoon Analysis and Prediction: Journal publications. [Webpage]
The Research Moored Array for African-Asian-Australian Monsoon Analysis and Prediction (RAMA) was designed to study the Indian Ocean’s role in the monsoons. One third of the world population depends on monsoon driven rainfall for agricultural production, so improving our understanding and ability to predict the monsoons has been a longstanding objective of the international scientific community. RAMA, the newest tropical buoy array, was initiated in the traditionally data sparse Indian Ocean in 2004 following deployment of successful pilot scale arrays by Japan and India. RAMA has since grown through the formation of new partnerships that at present include Indonesia, China, the USA, and the Bay of Bengal Large Marine Ecosystem (BOBLME) program.
2017-01-01T00:00:00Z