We will study the responses of the terrestrial, aquatic and glacial communities of organisms, including the microbes, at both poles to global environmental changes. Our key questions include (a) diversity and biogeography, (b) food webs and ecosystem evolution, and (c) links between biological, chemical, and physical processes in icy ecosystems. This is a huge collaboration involving 17 nations and a wide range of field work.

Thermal State of Permafrost Permafrost conditions underlie upwards of 25% of the Earth's land surface. Permafrost temperatures are a function of past and present climates and vary greatly depending on location. Lacking is a comprehensive set of pemafrost measurements against which to assess present and future regional and global changes. Duirng IPY, TSP researchers will obtain a "snapshot" of permafrost temperatures in hundread of borehole throughout the world.

Polarstern’s biggest fish catch in 24 years of research in Antarctic waters. New hope for commercial fisheries? Quite the opposite, a good catch doesn’t necessarily mean that depleted stocks have recovered. Five tons of marbled Antarctic cod (Notothenia rossii), now that was surely a big surprise to scientists and crew alike considering that previous and subsequent hauls barely ever reaped such plentiful harvests. Their shimmering silver and dark blue bodies, which can grow up to 70cm, were piled on the aft deck of Polarstern. In combination with previous stock assessments, fisheries biologists onboard interpreted the catch as a sampling of a discrete, small-scale aggregation of this fish species. ...

Launched in August 2007, the Phoenix Mars Mission is the first in NASA's Scout Program. Phoenix is designed to study the history of water and habitability potential in the Martian arctic's ice-rich soil. The harsh climates and exotic biology of Antarctic dry valleys provide an analogue to the more extreme environments of northern polar regions of Mars. Understanding how systems in the Antarctic work therefore provides useful information during future explorations of Mars.

Thawing permafrost could release large amounts of greenhouse gases to the atmosphere causing even more global warming !

This initiative was launched because there is considerable concern and increased awareness both within the international scientific community and the general public about the effects that global warming could have on frozen grounds in Arctic regions (Main Photo). A significant proportion of this permafrost would start to thaw out over the coming decades, with a potential release of large amounts of greenhouse gases (both carbon dioxide and the much more potent methane) to the atmosphere from previously frozen soil organic matter that will start to decompose. This is a so-called positive feedback within the Earth System, as climate warming results in permafrost thawing that causes a further increase of greenhouse gases in the Earth's atmosphere resulting in even more warming. We are not dealing only with a gradual process related to progressive thawing of the ground with depth over time. Also more dramatic events like ground subsidence due to melting of buried ice bodies (Photo 2) and lateral erosion along the edges of thaw lakes (Photo 3) would accelerate the release of greenhouse gases.

As key components of freshwater (lake and river), estuarine and nearshore marine aquatic environments of the circumpolar north, Arctic char and related fishes of the genus Salvelinus are fundamental to the lifestyles and well-being of northerners as the basis for extensive fisheries conducted for household food (i.e., domestic and subsistence), commercial and sport purposes. Chars contribute significantly to household and wage economies, and social and cultural elements of northern life. Chars are also key integrators and indicators of the health of northern aquatic ecosystems, many aspects of which are at significant risk from increased climate variability and change. However, human adaptive responses are hampered by a lack of vital information regarding char thermal ecology, biodiversity and its functional significance in northern ecosystems, mercury and other pollutant interactions, and how these may respond to climate change.