Pechora Sea

The Pechora Sea (Печо́рское мо́ре, Pechorskoye More) is an Arctic sea to the north-west of European Russia, forming the south-eastern portion of the Barents Sea. It is bordered to the west by Kolguyev Island; to the east by Vaygach Island's western coasts and the Yugorsky Peninsula; and to the north by the southern end of Novaya Zemlya.

Located in the centre of the East-Atlantic flyway with conditions befitting for benthic life, the Pechora Sea supports about 600 taxa and the Barents Sea's highest total biomass. It is the site of the yearly migration of one of the largest salmon stocks in Northern Europe. Compared to the rest of the Barents Sea, the Pechora Sea is unique for its more continental climate, lower salinity, shallowness, separation from the open sea and large input from rivers, as well as a low level of human interference historically. Its temperate characteristics are not typical of the Arctic.

History
Historically, before the adjacent Barents Sea was named as such, the Pechora Sea's own name was already established. The rest of the present-day Barents Sea was known then as Sea of Murmansk (Murmanskoye Morye).

The Pechora Sea was used as a starting point of the exploration of the then unknown icy seas lying to the east. The earliest recorded voyage across the Pechora Sea through the Yugorsky Strait was made by early Russian explorer Uleb, from Nizhny Novgorod. Uleb's passing into the Kara Sea was recorded in 1032.

Russian Pomors, the coastal dwellers of the White Sea shores, have explored the Sea and the coast of Novaya Zemlya since the 11th century. The Arctic's first shipping line, the Great Mangazea Route, from the White Sea to the Ob River and the Yenisei Gulf began operating in the latter part of the 16th century. This line opened up the way to Siberia's riches and it worked until 1619, when it was closed for military and political reasons, for fear of possible penetration by Europeans into Siberia.

Geography
The Pechora Sea is blocked by floating ice from November to Junea relatively short period. The main river entering the Sea is the Pechora. The Sea's salinity ranges from 18 to 34 ‰. At the central part of the Sea, the salinity stays around 34 ‰, and the temperature ranges from 0.5 to 2 C.

Bathymetry
The Pechora Sea's average depth is 6 m, and its deepest point reaches 210 m. The mean depth ranges from 11 m in the Bay to 190 m south of Novaya Zemlya. The Atlantic-influenced Kolguyev Current, which influences the temperature and salinity of the central part of the Sea, flows eastwards. There are a few islands close to the coast, the largest of which is Dolgiy Island.

The Sea's shallowness makes it distinct from the rest of the Barents Sea. Over its 205607 km2 area, the average depth in the Sea is around 50 m. This shallowness prevents the upwelling of nutrients from the Atlantic, contributing to the Sea's low pelagic productivity.

Hydrology
As with the neighbouring Kara Sea, the Pechora Sea's hydrologic situation is unique for its high input from rivers and heavy continental outflow. The Pechora River alone discharges about 130 km3 of freshwater into the Pechora Sea from the Pechora Riverthe Pechora Sea's main source of inflowsupplying the Sea with a sediment load of 6.1e6 t yearly.

Compared to other seas around the world, the Arctic Ocean's river-heavy source of inflow is significant, giving the Pechora Sea less Arctic-like characteristics than would be expected at latitudes so far from the equator. The Pechora Sea together with the bordering Kara Sea (separated by the jet stream) make up more than a third of the Arctic Ocean's total runoff from continental sources (as opposed to mostly saltwater sources like most oceans). This high input from rivers makes this area of the Arctic Ocean unique.

Temperature and salinity
Ice formation is boosted by the Sea's low salinity. The temperature ranges from -1.0 to 1.5 C below 150 m; 0.5 to 2 C at the central part of the Sea; and 5 to 8 C in summer and autumn at the southern part of the Sea.

Its salinity ranges from 8 to 18 ‰ in the bay, 18 to 26 ‰ in the southern portion, and 34 ‰ in the central part, increasing with distance from the mouth of the Pechora River.

Climate
The Pechora Sea has a humid continental climate. Polar bears and Atlantic walrus are threatened by climate change, which exceptionally burdens the Arctic.

Counteracting the Sea's continental position is the influx of nutrients supplied by the Pechora River, which gives the Sea 4570 km3 of sediment and 12500 t of other suspended matter.

The Sea's cold continental climate, a result of its location in the dead centre of the continent, gives favourable conditions to ice formation. As a result of this continental position and abundance of ice, the Sea's water column is stratified, its sediment is heterogeneous and its pelagic productivity is low.

Seafloor sediment
1 km-wide fast ice covers the floor of the Sea's coastal zone. On top of it is flaw polynya.

Biogeography and ecology
It supports a unique benthic ecosystem. The productive benthic environment fostered by the Pechora River holds more than 600 fauna. At the Kara and Yugor Straits, the total biomass is more than 500 mg/m2, the highest in the Barents Sea. This benefits benthic organisms such as walruses. The Pechora River, the main input for the Pechora Sea, has an average yearly runoff of 130 km3. The Pechora Sea has 70 fish species, the most abundant being Boreogadus saida. This species is important for the cryopelagic ecosystem.

The fisheries of the Barents Sea, in particular the cod fisheries, are of great importance for both Norway and Russia. There is a diversity of benthic fauna on the Pechora Sea floor. In addition, there is a genetically distinct polar bear population associated with the Barents Sea. The Karskaya group of beluga whales migrate into Pechora Sea for wintering. Various species such as walruses are threatened by possible pollutions.

Flora and fauna


There are about 600 taxa in the Pechora Sea. Various anadromous fishes inhabit the Sea. One of the largest Northern European stocks of Atlantic salmon (Salmo salar) as well as other fish populations from surrounding areas migrate throughout the Pechora Sea each autumn to spawn, a process which they complete under the ice. Additionally, the only stock of Coregonus autumnalis in Northern Europe, and one of the region's largest, spawns in the Pechora's estuary.

The Pechora Sea is the main 'staging and moulting ground for king eiders. Long-tailed ducks scoters and most other waterfowl species use the Sea as a stopover point.

At the Kara and Yugor Straits, the total biomass is more than 500 mg/m2, the highest in the Barents Sea. The most abundant phyla are Annelida, Bryozoa, Crustacea, Echinodermata, Mollusca and Sarcomastigophora.

Pollution
Relative to the rest of the Barents Sea, the water quality of the Pechora Sea is poor.

Oil and gas
, the Pechora Sea is one of the most developed places in the Arctic with regard to petroleum exploration.



In current times there is some oil drilling in the Pechora Sea at the Dolginskoye and Prirazlomnoye oil fields. The negative ecological impact of such industrial exploitation in the Pechora Sea coast is significant. According to Greenpeace and the World Wildlife Fund Gasprom is not prepared to deal adequately with a spill associated with oil production. As such, in September, 2013, Greenpeace staged a confrontation with the Russian Coast Guard in which Greenpeace activists approached and attempted to scale a Gasprom drilling platform.