Fjord

Fjord
Frédéric de Goldschmidt www.frederic.net · CC BY 2.5 · source
Name	Fjord
Caption	Glacially carved inlet
Type	Coastal inlet
Inflow	Glacial meltwater
Outflow	Ocean
Basin countries	Norway, Canada, New Zealand, Chile, United States, Greenland, Iceland

Fjord A fjord is a long, narrow, deep inlet of the sea between high cliffs or steep slopes formed by glacial erosion during past ice ages, associated with temperate and polar coasts. Fjords are prominent in the landscapes of Norway, New Zealand, Canada, Chile, and Greenland, and their study connects fields such as glaciology, oceanography, geology, geomorphology, and paleoclimatology. Research on fjords informs understanding of Quaternary glaciation, ice sheet dynamics, sea level rise, and the habitats of species studied by institutions like the Norwegian Polar Institute and the Scripps Institution of Oceanography.

Definition and Formation

Fjords form where valley glaciers, driven by Pleistocene ice masses and tributary glaciers, excavate U-shaped troughs that are subsequently inundated by sea level rise linked to deglaciation and isostatic rebound—processes examined in studies from University of Oslo and University of Cambridge. Classic models cite basal abrasion and plucking beneath fast-flowing outlet glaciers such as those once feeding the Laurentide Ice Sheet and the Fennoscandian Ice Sheet, with stratigraphic signatures recorded in cores analyzed by teams from Lamont–Doherty Earth Observatory and the British Antarctic Survey. Sedimentological evidence from fjord floors, including diamictons, glacial pavements, and over-deepened basins, is compared across sites like Sognefjord, Milford Sound, Hardangerfjord, and Kong Oscar Fjord to reconstruct glacier advance and retreat chronologies.

Geomorphology and Types

Fjord geomorphology includes features such as over-deepened basins, sills, hanging valleys, and fjord mouth bars; classification schemes reference glacial trough fjords, fjord-trough systems, and drowned glacial valleys studied in geomorphology programs at University of Bergen and McGill University. Variants include skerry-archipelago coasts adjacent to fjords in regions cataloged by UNESCO and complex fjordic systems like Puget Sound and the Patagonian fjords where fjord branching, sill-controlled circulation, and freshwater stratification are documented by researchers from NOAA and CSIC. Comparative analyses draw on examples such as Sognefjord, Lysefjord, Doubtful Sound, Gullmarn Fjord, and Tasiilaq Fjord to illustrate gradients in depth, width, and sedimentation.

Global Distribution and Notable Fjords

Fjords cluster in high-latitude and former glaciated mid-latitude coastlines including Scandinavia, British Columbia, Alaska, South Island (New Zealand), Patagonia, and Svalbard; prominent named fjords cited in cartography and tourism include Sognefjord, Hardangerfjord, Geirangerfjord, Milford Sound, Doubtful Sound, Kenai Fjords National Park, Lynn Canal, Aurlandsfjord, Hornfjord, Kangerlussuaq Fjord, Beagle Channel, Puerto Natales, Taymyr Peninsula fjords, and Scoresby Sound. Historic exploration accounts by figures associated with James Cook, Fridtjof Nansen, Roald Amundsen, and expeditions linked to Royal Geographical Society and Scott Polar Research Institute contributed to naming and mapping many fjords used today in navigation charts from NOAA and Hydrographic Offices.

Ecology and Biodiversity

Fjord ecosystems support stratified water columns with low-oxygen bottom waters and productive surface layers that sustain communities of plankton, fish, seabirds, and marine mammals studied by Icelandic Institute of Natural History, Fisheries and Oceans Canada, and Institute of Marine Research (Norway). Key species include Atlantic cod, herring, salmon, polar cod, harbor seal, killer whale, humpback whale, and seabirds such as Atlantic puffin and guillemot that forage in fjord waters, while nearby terrestrial flora and fauna reference Scots pine, birch, reindeer, and arctic fox in Arctic fjords. Fjords host important benthic habitats—cold-water corals, sponges, and soft-sediment communities—documented in studies by Woods Hole Oceanographic Institution and conservation assessments by IUCN.

Human Use and Cultural Significance

Fjords have long been hubs for human settlement, transport, and resource extraction, central to cultures and economies in regions including Norway, Chile, New Zealand, Canada, and Iceland; archeological sites and historic fjord settlements appear in records maintained by National Museum of Norway and regional heritage organizations like Heritage New Zealand. Activities include commercial fisheries regulated by agencies such as ICES and Fisheries and Oceans Canada, aquaculture operations associated with companies operating under standards from Marine Stewardship Council, hydroelectric schemes linked to dams and reservoirs like those recorded by Statkraft, and tourism centered on scenic fjords promoted by national tourism boards including Innovation Norway and Visit Norway.

Hazards and Environmental Change

Fjords are prone to geohazards—submarine landslides, tsunamis, and glacial lake outburst floods—that have produced catastrophic events studied after incidents near Tromsø, Geirangerfjord, and Lituya Bay; monitoring is conducted by agencies including Norwegian Water Resources and Energy Directorate and USGS. Climate-driven changes—retreat of glaciers such as those monitored at Jostedalsbreen, altered freshwater input influencing circulation in fjords like Sognefjord, and increasing ocean temperatures and acidification observed by IMR and Scripps Institution of Oceanography—affect carbon sequestration, fisheries, and biodiversity, prompting research collaborations among institutions including UNEP, IPCC, and regional universities.

Category:Coastal landforms