1. Scientists set sail on expedition to investigate 'Iceberg Alley' off Antarctica
The 5.4 million-square-mile Antarctic Ice Sheet is the greatest mass of fresh water on Earth. If it all were to melt, it would raise global sea levels some 220 feet. Searching for answers to how fast the ice might react to changes in climate, scientists are now studying how that ice reacted to past warm periods similar to today's.
More than two dozen researchers aboard the drillship JOIDES Resolution left Punta Arenas, Chile, on March 20. They will obtain cores of sediment from a remote section of seafloor, where ancient icebergs are believed to have left clues.
With information from these cores, the researchers hope to chart how the ice sheet waxed and waned in response to climate over the past 10 million years.
The two-month cruise is Expedition 382: Iceberg Alley and Subantarctic Ice and Ocean Dynamics of the International Ocean Discovery Program (IODP), a collaboration of scientists that coordinates large-scale ocean expeditions to study the Earth's history as it is recorded in sediments beneath the ocean floor.
On IODP Expedition 382, scientists plan to drill cores from the floor of the Scotia Sea off the Antarctic Peninsula.
As snow falls on Antarctica, it slowly builds up and turns into ice in the continent's interior. The ice then becomes glaciers, which move outward toward the coast. The ice carries sediment with it. When the ice reaches the ocean, icebergs break off, ferrying their load of debris to the sea.
more interested acees the link
https://phys.org/news/2019-03-scientists-iceberg-alley-antarctica.html
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2.Antarctic snowfall dominated by a few extreme snowstorms
Understanding the significance of these events is critical for scientists interpreting Antarctica's past, as well as predicting how our climate may
BRITISH ANTARCTIC SURVEY
A new study reveals the importance of a small number of intense storms around Antarctica in controlling the amount of snow falling across the continent.
Published in the journal Geophysical Research Letters, the study analysed daily Antarctic snowfall data starting in the 1970s. It reveals how the most extreme 10% of snowfall events account for up to 60% of annual snowfall in some places, and are the result of a few large storms that develop over the Southern Ocean.
more interested acees the link
https://www.eurekalert.org/pub_releases/2019-03/bas-asd032519.php
3. Connecting the Southern Ocean with Clouds
ACE-DATA/Antarctic Sea-Atmosphere Interactions Data (ASAID) Workshop; 5–6 November 2018, Lausanne, Switzerland
With rising global pollution, characterizing the processes of a previously unpolluted world is becoming ever more challenging. In the Antarctic and the surrounding Southern Ocean, we still find the cleanest seas and atmosphere on Earth. This makes it a particularly suitable place to investigate fundamental processes of ocean-atmosphere interactions in an almost pristine place. However, existing research in the Southern Ocean is mostly regional, making it difficult to generalize across the whole area.
he Antarctic Circumnavigation Expedition (ACE), organized in 2016–2017 by the Swiss Polar Institute, represents the first foray into linking the islands, the surrounding ocean, and the Antarctic continent. The wide range of marine, terrestrial, and atmospheric measurements collected by the 22 projects on board is helping to establish baselines for many variables across the different regions. The data also provide valuable input for Earth system models.
The ACE–Delivering Added Value to Antarctica (ACE-DATA) project is a joint effort of domain scientists and the Swiss Data Science Center aiming to exploit this cross-disciplinary data set. As part of this effort, scientists involved with seven ACE projects met in Lausanne, Switzerland, in November 2018 to discuss the Southern Ocean's complex interactions between sea state, phytoplankton, trace gases, aerosols, and clouds. This is of particular importance because global climate models still fail to reproduce the cloud coverage over the Southern Ocean, resulting in a poor representation of the energy balance. This effect, in turn, has repercussions for simulations of sea ice extent, latitudinal energy transport, and sea surface temperature.
more interested acees the link
https://eos.org/meeting-reports/connecting-the-southern-ocean-with-clouds
Shramik Maruti Patil
DST INSPIRE FACULTY
ESSO-NCPOR
DST INSPIRE FACULTY
ESSO-NCPOR
Ministry of Earth Science (MoES)
Headland Sada,
Vasco-Da-Gama,
Goa-403804
Headland Sada,
Vasco-Da-Gama,
Goa-403804
India
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