- Antarctica’s ‘Doomsday Glacier’ – Thwaites glacier
- Indian Rhino Vision (IRV) 2020 ends
ANTARCTICA’S ‘DOOMSDAY GLACIER’ – THWAITES GLACIER
Researchers have been able to obtain data from underneath Thwaites Glacier, also known as the ‘Doomsday Glacier’ and have found that the supply of warm water to the glacier is larger than previously thought, triggering concerns of faster melting and accelerating ice flow.
GS-III: Environment and Ecology (Climate Change and related issues)
Dimensions of the Article:
- About Thwaites Glacier
- Significance of the Glacier
- Previous studies on the Glacier
- What has the new study revealed?
About Thwaites Glacier
- Thwaites Glacier, also called the “Doomsday Glacier”, is in Antarctica and has long been a cause of concern because of its high potential of speeding up the global sea level rise happening due to climate change.
- The glacier is fast-moving and also melting fast over the years. It contains enough water to raise the world sea level by more than half a metre because of its size.
Significance of the Glacier
- Thwaites’s melting already contributes 4% to global sea level rise each year.
- Studies have found the amount of ice flowing out of it has nearly doubled over the past 30 years.
- It is estimated that it would collapse into the sea in 200-900 years.
- Thwaites is important for Antarctica as it slows the ice behind it from freely flowing into the ocean.
Previous studies on the Glacier
- A 2019 study had discovered a fast-growing cavity in the glacier and also detected warm water at a vital point below the glacier.
- The study reported water at just two degrees above freezing point at Thwaites’s “grounding zone” or “grounding line”. The grounding line is the place below a glacier at which the ice transitions between resting fully on bedrock and floating on the ocean as an ice shelf.
- When glaciers melt and lose weight, they float off the land where they used to be situated. When this happens, the grounding line retreats.
- That exposes more of a glacier’s underside to seawater, increasing the likelihood it will melt faster.
- This results in the glacier speeding up, stretching out, and thinning, causing the grounding line to retreat ever further.
What has the new study revealed?
- The researchers have been able to map the ocean currents that flow below Thwaites’s floating part.
- The researchers have been able to identify three inflows of warm water, among whom the damaging effects of one had been underestimated in the past.
- The study also looked at heat transport in one of the three channels which brings warm water towards the glacier from the north.
- This data will help us better calculate ice melting in the future and with the help of new technology, we can improve the models and reduce the great uncertainty that now prevails around global sea level variations.
Why is this a cause of worry?
- The study shows that warm water is approaching the pinning points of the glacier from all sides, impacting these locations where the ice is connected to the seabed and where the ice sheet finds stability.
- This has the potential to make things worse for Thwaites, whose ice shelf is already retreating.
-Source: Indian Express
INDIAN RHINO VISION (IRV) 2020 ENDS
Two adult one-horned rhinos were translocated from Pobitora Wildlife Sanctuary to Manas National Park under the aegis of the Indian Rhino Vision 2020 (IRV 2020).
GS-III: Environment and Ecology (Conservation of Environment and Ecology, Protected Areas, Species in news), Prelims
Dimensions of the Article:
- About Indian rhinoceros
- Status of Rhinoceros in India
- Indian Rhino Vision (IRV) 2020 programme
- Other efforts to conserve rhinoceros in India
- Kaziranga National Park
- Manas National Park
- Pobitora Wildlife Sanctuary
About Indian rhinoceros
- The Indian rhinoceros also called the Indian rhino, greater one-horned rhinoceros or great Indian rhinoceros, is a rhinoceros species native to the Indian subcontinent.
- It is listed as Vulnerable on the IUCN Red List, as populations are fragmented and restricted to less than 20,000 square kilometers.
- Moreover, the extent and quality of the rhino’s most important habitat, the alluvial Terai-Duar savanna and grasslands and riverine forest, is considered to be in decline due to human and livestock encroachment.
- The Census of Rhinoceros is undertaken at the State-level by the respective State Governments periodically.
Status of Rhinoceros in India
- The population of Greater One-horned Rhinoceros reached to the brink of extinction by the end of the 20th century with fewer than 200 animals in wild.
- The Indian rhinoceros once ranged throughout the entire stretch of the Indo-Gangetic Plain, but excessive hunting and agricultural development reduced its range drastically to 11 sites in northern India and southern Nepal.
- Nearly 85% of the global Indian rhinoceros population is concentrated in Assam, where Kaziranga National Park contains 70% of rhino population.
- Kaziranga National Park alone had an estimated population of more than 2,000 rhinos in 2009.
- Pobitora Wildlife Sanctuary in Assam has the highest density of Indian rhinos in the world.
- Although poaching remains a continuous threat (more than 150 rhinos were killed in Assam by poachers between 2000 and 2006), their numbers have increased due to conservation measures taken by the government.
Indian Rhino Vision (IRV) 2020 programme
- The WHO-India launched Indian Rhino Vision (IRV) 2020 programme to protect and increase the population of the one-horned rhinoceros.
- It is an ambitious effort to attain a wild population of at least 3,000 greater one-horned rhinos spread over seven protected areas in the Indian state of Assam by the year 2020.
IVR 2020 is a partnership among:
- Government of Assam,
- International Rhino Foundation,
- World Wide Fund for Nature (WWF),
- Bodoland Territorial Council, and
- U.S. Fish & World Wildlife foundation.
- The horns of rhinos will be trimmed (in a way that any damage is not done to their internal organs and the trimmed horns will grow back to their original shape within a few months) before their translocation to protect them from the poachers, who hunt them just to take away their horns.
- Manas National Park was the first to receive translocated rhinos.
- One of the biggest challenges turned out to be the difficulty in obtaining etorphine — a major component of the tranquilizing drug used to sedate large wild animals like rhinos and elephants.
- In partnership with local NGO’s and the State Agriculture Department, the livelihood options of the communities living on the fringes of the park are being developed by undertaking agriculture support programs.
Other efforts to conserve rhinoceros in India
National Conservation Strategy for the Indian One-Horned Rhinoceros
- It was launched in 2019 to conserve the greater one-horned rhinoceros.
- It is a first of its kind for the species in India which aims to work for the conservation of the species under five objectives which include strengthening protection, expanding the distribution range, research and monitoring, and adequate and sustained funding.
- Its goal is to repopulate Rhinoceros population in those areas also which used to hold the Rhinoceros earlier by augmenting the existing conservation efforts and strengthening them through scientific and administrative measures.
New Delhi Declaration on Asian Rhinos 2019
- India and four rhino range nations have signed a declaration ‘The New Delhi Declaration on Asian Rhinos 2019’ for the conservation and protection of the species.
- India will collaborate with Bhutan, Nepal, Indonesia and Malaysia to increase the population of three species of Asian rhinos, including the Greater one-horned rhinoceros found in the Indian sub-continent.
- The declaration was signed to conserve and review the population of the Greater one-horned, Javan and Sumatran rhinos every four years to reassess the need for joint actions to secure their future.
Kaziranga National Park
- Kaziranga National Park is a national park in the Golaghat, Karbi Anglong and Nagaon districts of the state of Assam.
- It is a World Heritage Site and hosts two-thirds of the world’s great one-horned rhinoceroses.
- Kaziranga is recognized as an Important Bird Area by BirdLife International for conservation of avifaunal species.
- Along with the iconic Greater one-horned rhinoceros, the park is the breeding ground of elephants, wild water buffalo, and swamp deer.
- Over the time, the tiger population has also increased in Kaziranga, and that’s the reason why Kaziranga was declared as Tiger Reserve in 2006.
- Due to the difference in altitude between the eastern and western areas of the park, here one can see mainly four types of vegetation’ like alluvial inundated grasslands, alluvial savanna woodlands, tropical moist mixed deciduous forests, and tropical semi-evergreen forests.
- Kaziranga is a vast expanse of tall elephant grass, marshland, and dense tropical moist broadleaf forests, criss-crossed by four major rivers, including the Brahmaputra, and the park includes numerous small bodies of water.
- Kaziranga has flat expanses of fertile, alluvial soil, formed by erosion and silt deposition by the River Brahmaputra.
- The history of Kaziranga as a protected area can be traced back to 1904 when the wife of the Viceroy of India, Lord Curzon visited the area and persuaded to take measures to protect rhinoceros in the area.
Manas National Park
- Manas National Park or Manas Wildlife Sanctuary is a national park, UNESCO Natural World Heritage site, a Project Tiger reserve, an elephant reserve and a biosphere reserve in Assam, India.
- Located in the Himalayan foothills, it is contiguous with the Royal Manas National Park in Bhutan.
- The park is known for its rare and endangered endemic wildlife such as the Assam roofed turtle, hispid hare, golden langur and pygmy hog.
- There are two major biomes present in Manas: The grassland biomes and the forest biomes.
- The monsoon forests of Manas lie in the Brahmaputra Valley semi-evergreen forests ecoregion.
Pobitora Wildlife Sanctuary
- Pobitora Wildlife Sanctuary is a wildlife sanctuary on the southern bank of the Brahmaputra in Morigaon district in Assam, India.
- Pobitora Wildlife Sanctuary’s grassland vegetation provides habitat and food resource for the Indian rhinoceros, golden jackal, wild boar and feral water buffalo. Barking deer, Indian leopard and rhesus macaque live foremost in the hilly parts.
- It is an Important Bird Area and home for more than 2000 migratory birds and various reptiles.
-Source: Deccan Herald, The Hindu