Antarctic is known for being earth's largest single mass of ice. It covers almost 14 million sq km and holds around 61 percent of earth’s freshwater. However, wide networks of canyons, waterways, and lakes that have been discovered buried under the ice sheet have captured the interest of people and are now the focus of novel scientific research. Subglacial lakes are large pockets of water that lie beneath a glacier or the ice sheet and are formed due to geothermal heat that is trapped by the insulating effect of the ice. These lakes may have existed since the continent became glaciated. There are around 400 subglacial lakes scattered across the Antarctic continent (Siegert et al., 2016). These subglacial lakes are proving to be attractive models to explore fundamental themes in limnology as well as have direct global implications such as landscape−lake interactions, the viability and adaptation of organisms to environmental extremes and subglacial aquatic environments as a planetary storehouse of ancient microbes and past climate records (Vincent and Laybourn-Parry, 2008)
Exploration of Antarctic subglacial lakes
The freezing of Antarctica began in the middle Eocene ( about 45.5 million years ago) and intensified during the Eocene−Oligocene about 35 million years ago. Since its formation, the ice sheet has withdrawn a little. However, its eastern and western parts have experienced significant fluctuations in ice volume over time.
The idea of subglacial lakes was proposed as early as the 19th century when Russian scientist Peter Kropotkin first suggested the existence of freshwater under the Antarctic ice sheets. He theorised that the tremendous pressure exerted by the cumulative mass of thousands of vertical meters of ice could increase the temperature at the lowest portions of the ice sheet to the point where the ice would melt.
この記事は Geography and You の June 1-15, 2019 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
すでに購読者です ? サインイン
この記事は Geography and You の June 1-15, 2019 版に掲載されています。
7 日間の Magzter GOLD 無料トライアルを開始して、何千もの厳選されたプレミアム ストーリー、9,000 以上の雑誌や新聞にアクセスしてください。
すでに購読者です? サインイン
Covid-19: Politics Of Knowledge, Public Health And The World Order
In the present era of a knowledge society, the world order will be shaped more than ever before by the politics of knowledge. In the post-CoVId world, public health knowledge is likely to be a significant contributor. This article briefly discusses the various contemporary public health approaches evident within the discipline: global health, community medicine and critical public health. Then it goes on to analyse country level policy approaches to the COVID-19 pandemic, delineating a tentative four-category typology, based on available information. Finally, it sets out the possible outcome indicators that should be used to assess the national responses.
WILD MEAT AND WET MARKETS: A GLOBAL DIALOGUE
Wet markets operate in most Asian countries including India. China reported its wet markets as the epicentre of the Covid-19 outbreak in Wuhan and also more recently in Beijing. These wet markets, a traditional part of popular local culture in Asian countries, are increasingly becoming a cause of concern for the international community and health practitioners across the globe. This article attempts to understand how global authorities and their Asian partners are looking to regulate these infamous wet markets to significantly lower the risk of viral and other pathogenic load from these unhygienic wet markets.
SEA WALL IN THE MALDIVES AND ITS SUSTAINABILITY
The Small Island developing states are particularly vulnerable to the peril of climate change. Sea level rise, increase in sea surface temperature, high incidences of drought and flood are some of the vulnerabilities that loom large over such island states.The republic of Maldives is one such example, which has been publicly advocating for the reduction in greenhouse gas emissions. Despite being one of the least contributors to such emissions, the Maldives faces the highest impact of global warming. Being one of the lowest-lying island nations, it has been undertaking various steps to curb the egregious impacts of environmental catastrophes.One of the response measures taken by the Maldives is the construction of seawalls. This article discusses this, while accenting the drawbacks and benefits associated with the approach.
TO PLUCK AT WILL: FRUIT TREES IN COMMON PROPERTY
Despite many governmental initiatives, malnutrition in India remains a major health challenge. There is a marked deficit of fruits in the diet of most Indians, consuming much lower than what is recommended by the World health organisation (Who). One of the reasons behind this is the high price of fruits and thus its inequitable access. As we prepare ourselves to live in a world marred by COVID-19 and a shrinking Indian economy, we must think of new ideas to manage access to food, especially micro nutrient rich fruits. This paper explores the possibility of planting endemic fruit trees in public spaces like roadsides and parks, that can help in increasing the consumption of fruits amongst the poor. It also attempts to analyse whether this can serve as a long term solution to bridge the gap between fruit production and consumption in India.
RESPONSIVE URBAN PLANNING: COVID-19 A TURNING POINT FOR REAL CHANGE IN INDIAN CITIES
The global challenge of COVID-19 is still unfurling. States are grappling to control its remorseless spread with varied success and its impact both on long and short-term scales are still being understood. However, a distinct urban bias in its spread across the globe and universal response of lockdown and social distancing for its control has brought pertinent questions to the fore. Urban planning and the future of our cities in terms of urban life and city form therefore needs to be revisited. In India, the exodus of migrant workers from its large cities has added yet another dimension to this challenge.
PAUSE AND REBOOT
REFLECTIONS ON ECONOMY, SOCIETY AND POLITY DURING COVID-19 GLOBAL PANDEMIC AND LESSONS FOR INDIA
Migrants & borders: My wishlist in a post-Covid-19 world
Former Professor of Economics and Education, School of Social Sciences, Jawaharlal Nehru University, New Delhi. bkhadria@gmail.com.
Inequalities in Access to Academic Spaces
Experiences of students from the socially excluded groups in higher education in India
Understanding Caste and Class - Categories and Measurement
The caste has been a unique social institution in India. It has also emerged in a new form after the mandalisation of caste in the early 1990s resulting in the extension of reservation to Other Backward Classes (OBCs) in government jobs and also in admissions to colleges and universities. The relative size of population of various caste groups particularly of the OBCs is also a matter of debate. Census does not provide population data on OBCs, however, it is possible to assess it from nationally representative sample surveys. Further, the correspondence between caste categories and class has been a matter of debate. This paper presents an assessment of class within caste categories based on data from nationally representative sample surveys.
The Middle Class - As the Class of No Class
An attempt to understand some of the ambiguities around what it means to be middle class in India has been made in this paper. It also discusses the influence that the middle class supposedly has on Indian politics despite these uncertainties.
