Daily PIB News (October 1, 2020): Global Climatic events Of Last 3200 Years May Have Caused Variations In Indian Monsoon

Global climatic events like the Roman Warm Period, Medieval Climate Anomaly, and the Little Ice Age may have had significant impacts on India’s landscape, vegetation, and socio-economic growth, with abrupt shifts in the Indian Summer Monsoon (ISM) coinciding with these climatic events.

A new study by the Wadia Institute of Himalayan Geology (WIHG), an autonomous institute of the Department of Science & Technology (DST), Government of India, shows wet monsoon conditions in the North-Western Himalaya between 1200 and 550 BCE. This condition prevailed till 450 AD, coinciding with the Roman Warm Period (RWP). It was followed by reduced precipitation and a weak ISM till 950 AD and then strengthened during the Medieval Climate Anomaly (MCA) between 950 and 1350 AD. During the Little Ice Age, there was a pronounced reduction in monsoon precipitation

Rewalsar Lake

The study carried out with lake sediments from Rewalsar Lake, a freshwater lake from Mandi district of Himachal Pradesh, could resolve the long debate among scientists about whether such events were local or global.  Sediments from this lake preserve signature that can be used as proxies to understand monsoon variability in the past.

Also known as the Tso Pema Lotus Lake, it is a mid-altitude lake located on a mountain spur in Mandi. It is a square shaped lake with a shoreline of 735 km. This lake is considered to be holy and revered by Buddhists, Hindus and Sikh.

 The natural lake at Rewalsar is famous for its floating reed islands and fishes. Hindu, Buddhist and Sikh shrines exist along the periphery of Lake. Legend has it that the great teacher and scholar Padmasambhava used his enormous powers to take flight to Tibet from Rewalsar.

Scientists Uncover Clue Of How First Extreme-UV Light appeared

India’s first multi-wavelength satellite, AstroSat, has detected extreme-UV (EUV) light from a galaxy, called AUDFs01, 9.3 billion light-years away from Earth.

At the time, our universe was forming stars at its peak rate. Such EUV radiation has enough energy to ionize a hydrogen atom by liberating its electron from the nucleus’s influence. The EUV photons emitted by galaxies like AUDFs01 could play a crucial role in reionizing the early universe soon after the Cosmic Dark Age and emitting the first light.

A collaboration of researchers from different countries under the project CEFIPRA funded by Indo-French Centre for the Promotion of Advanced Research (CEFIPRA) a bilateral organization set up by the Department of Science & Technology, Government of India and the Ministry for Europe and Foreign Affairs, Government of France delved into how galaxies like AUDFs01 grow their stellar mass when the first stars and galaxies became visible.

The multi-wavelength satellite AstroSat, which was launched on September 28, 2015, by the Indian Space Research Organisation (ISRO) has five unique X-ray and ultraviolet telescopes working in tandem and has onboard the UltraViolet Imaging Telescope (UVIT).

AUDFs01 is the first example of a leaking galaxy with clumpy morphology.

Image by WikiImages from Pixabay