Topic 2 - EQ4 - Glaciation (Mr W) Flashcards
What are the 5 industries that glaciated landscapes have economic value for?
Farming, forestry, mining, HEP and tourism
What industry categories do these 5 industries that glaciated landscapes hold economic value fall into?
Farming, forestry, mining - Primary
HEP - Secondary
Tourism - Tertiary
Why do glaciated landscapes hold economic value for the farming industry?
The fertile clays and sands of glaciated landscapes allow great agricultural development. For example: the Mendoza province (mountains and glaciers in the west of the province) of Argentina is one of the country’s prime wine growing areas.
Why do glaciated landscapes hold economic value for the forestry industry?
The steeper slopes unsustainable for agriculture and agricultural development (due to gradient) can be used to develop forestry. For example: the Southern Alps in New Zealand.
Why do glaciated landscapes hold economic value for the mining industry?
The upland areas of glaciated landscapes are perfect for the development of quarries proving building stone and cement. For example: green slate from Honiston (Lake District) and cement from Exshaw Cement Works in Canada
Why do glaciated landscapes hold economic value for the tourism industry?
- The ribbon lakes in the glacial troughs have proved to be an attractor of visitors in the Lake District
- In the glaciated landscape of the French Alps skiing in the slopes and glaciers has proven to be extremely successful with millions flocking from around Europe every year to ski in the Alps
- The flat valley floors of glacial troughs (e.g. Saas Grund in Switzerland) allow transport routes to be developed for tourists AND locals
Why do glaciated landscapes hold economic value for the Hydro-Electric Power industry?
Glaciated landscapes offer the opportunity to develop HEP in sparsely populated areas. For example: the reservoir at Saas Mattmark which has an earth filled HEP dam made out of moraine material.
For what 3 reasons do glaciated landscapes have environmental value?
- Biodiversity
- Water storage and role in global water cycle
- Habitat
Why do glaciated landscapes hold environmental value in terms of biodiversity?
They have distinct ecosystems. For example, Greenland has a fragile biodiversity of endemic plants, large mammals such as polar bears and whales as well as as a diverse range of fish and birds (organisms and ecosystem also offer important opportunities for ecological and biological research).
Why do glaciated landscapes hold environmental value in terms of the water cycle and water storage?
The cryosphere (ice) is an important store of water in the global water cycle, the vast majority of the cryosphere is glaciated landscapes. For example, Greenland ice sheet contains approximately 10% of the total global ice mass, therefore, it is an important store of global ice, if it were to melt it would cause sea level rises or up to 7m globally with devastating implications.
Also play a critical role in human water supply. Rivers around the globe are fed by glacial meltwater and supply water to populations to fulfil their demands. For example, Mekong river in China fed by Himalayan meltwater supplies water to high demand populations in China (world’s most populous country). Also, Arapaho glacier in Colorado produces 260 million gallons of drinkable water per year for the people of Boulder Colorado. Without meltwater historical population centres wouldn’t have been established where they are today, and modern settlements would likely not be as sustainable.
Why do glaciated landscapes hold environmental value in terms of habitat?
Home to many species of animals as mentioned before (e.g. Polar Bears in Svalbard). However, also act as homes for migratory species. For example, the Yamal Peninsula in Russia provides a summer home for a variety of migratory bird species and thus plays a crucial role in worldwide food webs. (Bonus point: Yamal Peninsula also acts as a large scale carbon sink)
Why do glaciated and periglacial landscapes have unique biodiversity?
The tundra environment is extreme with only a three month growing season and long, dark winters which only a few plants and animals can survive through, and so plants and animals are often endemic due to specialist adaptations to the climate. For example, the arctic Poppy’s flowers follow the sun, arctic fox has white fur.
Also, tundra ecosystems are more fragile because surface runoff is low and decomposition rates are low meaning that pollutants stay in the environment for a long time.
What is phenology?
The timing of natural events and phenomena (e.g. first snowdrops appear) in relation to climate.
What is the evidence to show the majority of the world’s glaciers are currently retreating?
- On the eastern slopes of the Rocky Mountains all the glaciers have lost 25-75% of their mass since 1850
- 38% decrease in glacier land coverage since 1949
- Approx 95% of Himalayan glaciers are retreating rapidly
- Satellites show Greenland Ice sheet retreat
- Massive loss in shelf ice in W and E Antarctica
What region are glaciers actually advancing? Why?
Maritime glaciers in Scandinavia. In Scandinavia the elements of changing precipitation have contributed to a more positive mass balance.
Why is retreat happening at an exponential rate in the vast ice sheets of Greenland and Antarctica?
Positive feedback cycles.
Less ice = loss of albedo = reduced reflection = more atmospheric warming = more melting and retreat
How is climate warming impacting on glaciated landscapes in different parts of the world?
- Rivers in Asia fed by meltwater (e.g. Mekong and Ganges) have lost their steady supply of meltwater which has had implications of India and China who have insatiable demands for water as home to 1/3 of the global population and rapidly growing economies. E.g. western China’s semi-desert area contains 350 million farmers dependent on Tibetan glaciers for water hence development of hard engineering projects, like South-North transfer, to improve water security. Indian meltwater decrease will affect nearly 40% of India’s irrigated land.
- 30% of water in Peruvian Andes comes from a meltwater source. This could result in an increased flood risk in summer due to spikes in temperature with more extreme temps with climate change, low levels of meltwater will limit HEP dam operation and changes in sediment yield.