Climate Change Impacts on Alaskan Native Communities | Arctic Resilience

Permafrost covers approximately 11% of Earth's land mass, including half of Canada and two-thirds of Russia. It consists of rock, sediment, or ice remaining at or below 0°C for two or more consecutive years, often containing organic material accumulated over thousands to millions of years. The active layer above permafrost thaws and freezes annually, supporting ecosystems from forests to tundra. However, the Arctic is warming three to four times faster than global averages, causing the active layer to deepen about 6 cm annually. This thawing threatens to release vast amounts of stored carbon, with estimates suggesting four times more carbon exists in permafrost than all human-generated CO2 emissions in modern history.

Permafrost is frozen ground remaining frozen for at least two consecutive years, forming in cold climates at high latitudes or altitudes where summer thawing is incomplete. It consists of rock, sediment, and soil bound by ice acting as cement, with most modern permafrost forming during or since the last ice age. The active layer above permafrost thaws seasonally (30-200 cm deep), while permafrost itself can extend 1,500 meters. Repeated freezing creates ice wedge polygons. Permafrost covers 25% of northern hemisphere land and extends beneath flooded shelf seas, found in Russia, Canada, Alaska, China, Greenland, Scandinavia, and high mountains. Increasing global temperatures cause permafrost degradation with severe consequences: deeper active layers prevent complete winter refreezing, weakening ground stability and increasing coastal erosion. Infrastructure faces shifting foundations costing hundreds of millions. Permafrost acts as a massive carbon freezer storing 1,500 gigatons of organic matter—nearly twice atmospheric carbon—accumulated over tens of thousands of years. When thawed, microbes release CO2 and methane, creating an irreversible feedback cycle accelerating warming. While vegetation may absorb some CO2, it cannot compensate for permafrost carbon emissions. Predicting permafrost response remains challenging due to complex variables, with unexpected phenomena like Siberian crater formation challenging existing understanding. The Global Terrestrial Network for Permafrost monitors temperature and active layer thickness through international observation networks, requiring coordinated action by national governments and international organizations to address imminent climate impacts.

Permafrost thawing creates multiple interconnected consequences. The ground becomes unstable and swamp-like, causing structures to sink. Thawing releases ancient organic material preserved for thousands to millions of years, with bacteria decomposing it and releasing CO2 and methane. Methane accumulation can cause dangerous explosions. This process affects diverse regions including Siberia, Canada, Greenland, and the Alps. Permafrost preserves remarkable specimens like mammoths with extractable DNA, but also harbors ancient pathogens that can cause disease outbreaks, as demonstrated by the Russian anthrax epidemic among reindeer.

Permafrost is soil, sediment, rock, and ice frozen for more than two years, found in 24% of northern hemisphere land. When it thaws, ice melts leaving cavernous gaps that collapse, warping roads and creating craters up to half a mile wide. The thawing organic material releases carbon dioxide and methane, the most potent greenhouse gases. This creates a dangerous feedback loop: warming causes more thawing, which releases more greenhouse gases, causing more warming. Without intervention, 70% of permafrost could thaw by 2100, releasing 120 Giga tons of carbon and raising sea levels by at least 6 meters.

Permafrost thawing causes multiple environmental and health consequences. In 2016, a 75-year-old anthrax outbreak occurred in Siberia when permafrost thawing released frozen anthrax bacteria, causing multiple human deaths and hundreds of reindeer deaths. Permafrost thawing also damages infrastructure, including buildings and roads, because frozen ground becomes unstable. Additionally, thawing permafrost releases carbon dioxide and methane, which are potent greenhouse gases that contribute to global warming. The Arctic region contains approximately double the atmospheric carbon, with much stored in permafrost within Arctic wetlands.

Rising seas result from thermal expansion of warming oceans and melting ice sheets. Storm surges—temporary localized sea level rises generated by storms—became more dangerous as baseline sea levels rise. Higher initial sea levels allow storms to penetrate further inland. The Maldives built the Great Wall of Maldives to dissipate wave energy. Superstorm Sandy demonstrated devastating impacts: $65B damage, 60 deaths, thousands homeless. Coastal areas worldwide face vulnerability: Bangladesh's dense population, Florida's coastlines, Gulf Coast cities, and Pacific Islands may require evacuation. Rising seas threaten to displace millions, creating environmental refugees. Coastal infrastructure faces unprecedented challenges as climate change accelerates sea level rise and intensifies storm impacts.

Sea level change occurs through eustatic (global) and relative (local) processes. Eustatic changes affect overall ocean volume and basin shape, increasing storm surge and erosion hazards. Relative changes involve land and water movement, with rapid rises devastating coastal habitats. Storm surge is the local sea level rise from wind pushing water toward shore during storms, caused by wind stress and low atmospheric pressure. It is measured as water height above normal astronomical tide. Storm surge can flood coastal areas and push water into freshwater aquifers, degrading drinking water sources and threatening groundwater quality.

Sea level rise is occurring at an average rate of almost eight-tenths of a foot every 100 years, with acceleration in the last 20 years. Projections indicate 1.5 to 3 feet of sea level rise by the end of the century, which will inundate significant coastal areas even with weaker storms. Hurricane Sandy demonstrated how sea level rise and atmospheric blocking combine to create devastating coastal flooding—Sandy was a slow-moving storm that created three days of onshore flow, piling water toward the coastline. The combination of sea level rise, beach erosion (100-250 feet on the south coast), and storm surge produced remarkable devastation. Coastal vulnerability mapping shows areas at risk from different categories of storm surge, with homes destroyed three to five blocks inland even from moderate storms. Communities face difficult decisions about whether to protect assets cost-effectively or adapt surroundings to provide natural buffers.

The coastal zone extends beyond the high tide line to include the continental shelf, representing a geological area that was once continental. Coastal dynamics are classified into transgressive coasts (ocean advances) and regressive coasts (ocean retreats), with additional classification by tidal versus wave dominance. Spatio-temporal scales in coastal management range from geological scales (centuries to millennia) for estuarine evolution to event scales (hours to days) for storm impacts. Storm surges are long waves (10-20 second periods) that can cause significant coastal flooding, lasting minutes rather than seconds. Sea level rise is the primary long-term driver of coastal change, operating at millimeters per year but accumulating to significant changes over millennia. The rate of sea level rise (currently 3.6 mm/year) combined with storm surge events determines coastal vulnerability. Nature-based solutions for coastal protection include beach nourishment, dune restoration, and wetland preservation, working with natural processes rather than against them. Coastal ecosystems provide multiple services: physical protection through barriers that absorb wave energy, flood attenuation, biodiversity habitat provision, water filtration, and cultural benefits. Marshes are particularly effective at carbon sequestration, potentially storing more carbon than tropical forests.

Rising sea levels cause two primary coastal impacts: (1) High tide submersions - flooding during major tides that were previously rare, now occurring more frequently; (2) Storm surge flooding - combining low pressure, wind effects, and wave action. When sea level rise is superimposed on storm surge, flooding becomes more frequent and intense. Coastal erosion results from multiple phenomena at different time scales, including extreme events and seasonal variability. Scientific evidence suggests attributing erosion to sea level rise alone is premature in most locations, as natural variability and human activities also play significant roles.

Alaska, the largest U.S. state at one-third the size of the contiguous United States, contains diverse ecosystems including tundra, spruce forests, and muskeg/bog systems. These ecosystems have shaped the cultures of indigenous peoples. The Anup Eskimos in the far north rely on sea mammals like whales and seals. The Yupik Eskimos inhabit varied ecosystems from coastal boglands to inland spruce forests, practicing seasonal subsistence strategies including sea mammal hunting in summer and moose/caribou hunting in winter. The Aleut people, Alaska's maritime people, live on the Aleutian Islands and depend on the North Pacific and Bering Sea for their livelihood.

Indigenous peoples of Alaska maintain their traditional subsistence lifestyle through generations of accumulated knowledge, adapting to harsh environments while preserving cultural practices that connect them to their ancestral lands; this includes hunting, fishing, building shelters, and passing down traditional skills to younger generations, demonstrating how indigenous communities navigate changing climates and modern challenges while maintaining their identity and way of life.

Alaska Native communities maintain a subsistence lifestyle where traditional hunting, fishing, and gathering of local foods like salmonberries (equivalent to oranges in vitamin C content) remain essential for both cultural preservation and economic necessity due to high grocery costs, while personal identity and resilience are strengthened through embracing both sides of one's heritage and overcoming adversity.

Alaska Native cultures share core values including respect, equality, and interconnectedness with nature, expressed through subsistence practices of living from the land, sharing resources, and maintaining traditional languages; these living traditions are preserved and passed between generations through active knowledge transfer between elders and youth, demonstrating that cultural heritage is dynamic and evolving rather than static or archaic.

Indigenous Alaskan communities practice traditional subsistence hunting where families rely on hunting and fishing to survive. During summer, families must catch large quantities of fish to stock up for the long winter. They also hunt moose to obtain meat and fat, and use the hide to make hats that can be sold for hundreds of dollars. This way of life involves living off the land without modern conveniences like cars or offices, relying entirely on their skills to provide for their families and elders. The Yup'ik people, indigenous to Alaska, experienced significant cultural suppression when 55 years ago their language was banned. Despite this, they have fought to preserve their cultural heritage, with some community members becoming professors at Stanford University, teaching the Yup'ik language and traditional culture. Family cooperation is essential for survival, with brothers and sisters working together as a team, relying on each other completely and willing to risk their lives for one another without hesitation.