Gulf of Alaska

The Gulf of Alaska is a massive arm of the Pacific Ocean. It follows the southern curve of the Alaska coastline. This area is a vital part of the North Pacific system. It serves as a productive ecosystem for many different species. The gulf is bounded by the Alaska coast to the north. To the south, a line runs from Cape Spencer to Kabuch Point. This line ensures all adjacent islands are included in the gulf.

The physical landscape of the shoreline is very diverse. It consists of thick forests and tall mountains. Many tidewater glaciers also meet the sea here. The Malaspina Glacier and the Bering Glacier are the largest in Alaska. These massive ice structures spill out onto the coastline. The coast is also heavily indented by large bodies of water. Cook Inlet and Prince William Sound are the two largest connected areas. Yakutat Bay is another important feature of this coastline.

Ocean currents play a major role in the gulf's environment. The North Pacific Current flows through this region. This current is fed by the warm Kuroshio Current. Because of this warm water, the gulf remains ice-free all year. This constant temperature supports a highly productive ecosystem. Scientists classify it as a Class I ecosystem. It contains more than 300 grams of carbon per square meter every year. This carbon is based on data from SeaWiFS.

Life thrives in these waters, even in the deep ocean. Deep water corals can be found throughout the gulf. One specific type is called Primnoa pacifica. This coral is typically found in deep water. Because of this species, the area is labeled a Habitat Area of Particular Concern. These corals help define the biological importance of the region. The presence of such life shows how healthy the ecosystem is.

Climate patterns in the gulf have changed significantly over time. In 1977, the gulf showed an unexpected shift in its climate regime. This change was at first inexplicable to scientists. The mean temperature of the sea surface began to grow. A similar volatile change occurred in the North Pacific during the 1970s. This warming had a direct effect on local biology. It led to an increased variety of commercial fish species.

The gulf is also a powerful generator of weather systems. It creates many large storms that impact the coast. These storms dump massive amounts of snow and ice on southern Alaska. These are some of the largest concentrations south of the Arctic Circle. Many storms move south along the coasts of British Columbia and Washington. They can reach Oregon or even Southern California during El Niño events. Much of the seasonal rain in the Pacific Northwest comes from here.

There are several notable locations within the gulf's boundaries. Lituya Bay is a fjord located south of Mount Fairweather. This bay was the site of the largest recorded tsunami in history. The gulf also provides sheltered anchorages for fishing boats. The region contains hundreds of islands, such as Kodiak Island and Admiralty Island. These islands add to the complex geography of the area. The gulf remains a central part of the Pacific's natural systems.