Kara Sea

Kara Sea
CC BY-SA 3.0 · source
Name	Kara Sea
Caption	Map showing the location of the Kara Sea.
Location	Arctic Ocean
Type	Marginal sea
Inflow	Ob River, Yenisei River, Pyasina River, Taz River
Outflow	Arctic Ocean
Basin countries	Russia
Area	~926,000 km²
Depth	110 m
Max-depth	620 m
Frozen	October to June

Kara Sea. A marginal sea of the Arctic Ocean, located off the northern coast of Siberia between the Barents Sea and the Laptev Sea. It is bordered by the Kara Strait and Novaya Zemlya archipelago to the west, the Severnaya Zemlya islands to the east, and the Siberian Mainland to the south. The sea is a critical component of the Northern Sea Route, historically significant for Arctic exploration and rich in natural resources, though its severe climate presents significant challenges.

Geography

The Kara Sea is bounded to the west by the Novaya Zemlya archipelago, which separates it from the Barents Sea, and to the east by the Severnaya Zemlya islands, beyond which lies the Laptev Sea. Its southern limit is the mainland coast of Siberia, including the Yamal Peninsula and the Gydan Peninsula. Major gulfs include the large, shallow Gulf of Ob, fed by the Ob River, and the Yenisei Gulf, which receives outflow from the Yenisei River. Other significant inlets are the Baydaratskaya Bay and the Gyda Bay. The sea's floor is primarily a continuation of the West Siberian Plain, forming a vast shelf area with an average depth of about 110 meters, though the St. Anna Trough in the northwest reaches depths exceeding 600 meters.

Climate

The climate is classified as polar maritime, characterized by long, severe winters and short, cool summers. Temperatures frequently drop below -20°C in January and February, with the sea typically ice-covered from October through June. Summer temperatures average only a few degrees above freezing. The region experiences polar night from late November to mid-January and the midnight sun in summer. Weather is influenced by the Siberian High in winter and by cyclonic activity from the North Atlantic and the Barents Sea, often bringing fog, strong winds, and storms. Sea ice conditions are highly variable, influenced by Atlantic inflows through the Kara Gate and river discharge.

Hydrography

The Kara Sea receives enormous freshwater input from some of Siberia's greatest rivers, primarily the Ob River and the Yenisei River, along with the Pyasina River and the Taz River. This creates large areas of brackish water, particularly in the Gulf of Ob and Yenisei Gulf, which significantly lowers surface salinity. The general surface circulation is cyclonic, with a flow moving eastward along the coast and northward along Novaya Zemlya. Warmer, saltier water from the Barents Sea enters via the Kara Gate and the passage around the northern tip of Novaya Zemlya, flowing along the St. Anna Trough. Tides are predominantly semidiurnal, with the highest amplitudes occurring in the Baydaratskaya Bay.

Flora and Fauna

Biological productivity is relatively low but is enhanced near river mouths where nutrients are abundant. The phytoplankton community is dominated by diatoms. Coastal tundra vegetation includes mosses, lichens, and hardy grasses. The sea supports populations of marine mammals such as the beluga whale, walrus, and several seal species including the bearded seal and ringed seal. Polar bears are common on the pack ice. Important bird areas on the islands and coasts host colonies of guillemots, kittiwakes, and other seabirds. Commercially significant fish species include Arctic char, Arctic cisco, and navaga, while the estuaries are vital spawning grounds for Siberian sturgeon.

History

The coast was likely known to Pomors and the indigenous Nenets people for centuries. Western exploration began in earnest during the Great Northern Expedition of the 18th century. The sea was named after the Kara River, now insignificant. It became a focal point during the late 19th and early 20th centuries during the quest for the Northeast Passage, with notable expeditions led by Adolf Erik Nordenskiöld on the Vega, and later by Fridtjof Nansen on the Fram. During the Soviet Union era, the sea was used for the Northern Sea Route and saw the establishment of research stations and the infamous Gulag system on islands like Bely Island. It was also a site for nuclear testing and radioactive waste disposal during the Cold War.

Economy and Resources

The primary economic importance lies in its vast hydrocarbon reserves within the West Siberian Basin. Major projects are developed by companies like Gazprom and Rosneft, including the Yamal LNG project centered on the South Tambey Field. Shipping along the Northern Sea Route is seasonal, relying on nuclear icebreakers like those operated by Atomflot. Fishing is limited and mostly artisanal. Significant environmental concerns stem from industrial pollution from the Ob River and Yenisei River basins, legacy radioactive waste from the Soviet Navy, and the impacts of climate change on sea ice and coastal erosion. Future development is closely tied to global energy markets and the feasibility of Arctic shipping.

Category:Seas of the Arctic Ocean Category:Marginal seas of the Atlantic Ocean Category:Geography of Russia