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Western Ghats biodiversity is a significant source of moisture for monsoon

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Western Ghats biodiversity is a significant source of moisture for monsoon

~By Raghu Murtugudde

The mountain range that runs along the west coast of peninsular India from Tamil Nadu through Kerala, Karnataka, and Goa to Maharashtra is known as the Western Ghats and is very well known for its majestic beauty. It is also among the top eight biodiversity hotspots in the world. The Western Ghats host over 400 species and 7 distinct vegetation types.

The Western Ghats are often in the news due to constant threat to their biodiversity. Forest cover has declined by up to 50% in parts of Uttara Kannada district of Karnataka and the evergreens in Kerala are facing a threat of extinction. The overall deforestation is reported to be accelerating over recent decades. In the meantime, water distribution remains a contentious issue among states in the region. What has not been understood clearly is just how critical a source of moisture the greenery of the Western Ghats is for some of the water-stressed states.

The Ghats run perpendicular to the moisture-laden southwest monsoon winds gusting in from the Arabian Sea, forcing the winds to climb the mountain range to get over to the other side. This climb leads to an expansion of the winds since pressure decreases with height in the atmosphere and the expansion leads to a cooling and thus condensation of the moisture, resulting in annual rainfall ranging from 2000 mm to nearly 7800 mm. If you are hiking the Ghats during the rainy season and happen to catch one of the break periods in the monsoon, then you will see water vapor pouring out of lush green vegetation like steam over a hot cup of coffee.

Studies on the impact of deforestation have mostly focused on the Amazon and the results have shown dramatic local and remote effects of deforesting the Amazon. It turns out that the loss of vegetation over the Ghats also would have detrimental effects on rainfall over India.  A study focused on this issue led by Supantha Paul under guidance of Subimal Ghosh at IIT-Bombay, of which this author is also a contributor, is appearing in scientific journal Geophysical Research Letters.

In this study, a regional atmospheric model which includes the representation of land and vegetation has been employed to conduct monsoon simulations for the period 1990-2015. A regional model can be computationally efficient due to its limited simulation domain and can be run at relatively high grid resolutions compared to the global climate models. This high grid resolution allows features like the Western Ghats and their vegetation types as well as agricultural and urban landscapes over the rest of India, to be represented more accurately compared to relatively lower-resolution global models. The leaf and stem area and canopy heights of vegetation and their evapotranspiration and energy exchange with the atmosphere are captured accurately by the model.  The model simulations can then be performed with all the vegetation included and by denuding the Western Ghats partially or totally.

The simulation period chosen includes sufficient number of seasons, active/break periods as well as normal and deficit monsoon years to allow us to confidently assess the moisture contribution of the Western Ghats vegetation to rainfall over interior India. Earlier studies on moisture sources for the Indian monsoon led by Amey Pathak of IITB had pointed out that the vast Ganga basin with its river water and agricultural activities, acts not only as a major source of moisture for itself in terms local evaporation and recycled rain but also as a significant supplier of moisture for rain over northeast India.

The new study points out that the evapotranspiration from the vegetation over the Western Ghats accounts for one quarter of the rainfall over peninsular India. This is highly significant. For example, Tamil Nadu receives a total annual rainfall of 960 mm but only 33% of that falls during the summer monsoon. The summer rainfall is thus critical for the Kharif crop season over Tamil Nadu.

The monsoon occurs in weeks of rain known as the active period followed by several days or weeks of mini-droughts known as the break period.  Model simulations show that the moisture supply from the Western Ghats is critical during the break period since it accounts for up to 50% of the total rainfall over the state of Tamil Nadu. The evergreen broadleaf forests in the southern Western Ghats are a significant bucket of moisture for rainfall over Tamil Nadu.

The monsoon during 1993, 1999 and 2002 were severely deficient over Tamil Nadu and the Kaveri basin. Model simulations attribute up to 50% of the rainfall during these deficit years to be due to the moisture supplied by the Western Ghats. It is clear that the thick vegetation cover over the Ghats accumulates moisture and acts like a capacitor to release the moisture to peninsular India during dry periods – be they the mini-droughts or break periods during a normal monsoon or the extended break periods associated with drought years.

The study also shows that any reduction in rainfall due to deforestation of the Western Ghats would lead to a warming of peninsular India as well. This can be expected since the monsoon rains typically bring a significant cooling over India by dragging down the dry cool air from the upper atmosphere. This cooling is a lifesaving relief from the scorching pre-monsoon temperatures and heatwaves.

Continued deforestation is of great concern for the ecological community due to the loss of precious flora and fauna. This study puts a finer point on the value of the Western Ghats biodiversity as a significant source of moisture for rainfall over parts of India that are constantly struggling for water for agriculture as well as domestic and industrial use. The battle cry for protecting biodiversity hotspots and the overall forest cover over the Western Ghats just got louder. (India Science Wire)

The author is a Professor at the Earth System Science Interdisciplinary Center, University of Maryland and a visiting faculty at IISER, Pune and IIT, Bombay.

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ISRO-European Space Agency sign agreement for advancing human spaceflight

Dr. Aschbacher expressed gratitude to Dr. Somanath for his address at the ESA Council, noting that the agreement lays a solid foundation for ongoing cooperation between the two agencies.

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ISRO on Saturday announced that it has signed an agreement with the European Space Agency (ESA) to collaborate on astronaut training, mission execution, and research initiatives. The agreement was formalised by ISRO Chairman Dr. S Somanath and ESA Director General Dr. Josef Aschbacher.

This partnership establishes a framework for cooperative efforts in human space exploration and research, focusing on areas such as astronaut training, experiment development and integration using ESA facilities on the International Space Station (ISS), human and biomedical research experiments, and joint educational outreach programs, according to ISRO’s statement.

For the upcoming Axiom-4 mission, where ISRO’s Gaganyatri will be part of the crew alongside an ESA astronaut, both organizations will work together to conduct experiments proposed by Indian Principal Investigators on the ISS.

Moreover, the collaboration aims to include participation in ESA’s human physiological studies, technology demonstration experiments, and further joint educational outreach initiatives.

During the announcement, Dr. Somanath emphasised that ISRO has developed a roadmap for human spaceflight activities, and with the approval of the Bharatiya Antariksh Station (BAS), India’s planned indigenous space station, there is an opportunity to foster interoperability between human spaceflight programs.

Dr. Aschbacher expressed gratitude to Dr. Somanath for his address at the ESA Council, noting that the agreement lays a solid foundation for ongoing cooperation between the two agencies.

The leadership of both ISRO and ESA conveyed their satisfaction with the progress of the joint projects related to the Axiom-4 mission and emphasized the importance of continuing collaborative efforts in human spaceflight in the future, according to ISRO’s statement.

ISRO has stated that the newly signed agreement creates a framework for collaboration in human space exploration and research. This partnership emphasizes astronaut training, support for experiment development and integration—which includes utilising ESA facilities on the International Space Station—along with conducting human and biomedical research experiments and engaging in joint educational and outreach initiatives.

In preparation for the upcoming Axiom-4 mission, which will feature ISRO’s Gaganyatri alongside an ESA astronaut, both agencies are working together to implement experiments proposed by Indian Principal Investigators on the ISS. Additionally, ISRO is actively pursuing participation in ESA’s human physiological studies, technology demonstration experiments, and joint educational outreach efforts.

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ISRO-NASA mission: Astronaut Shubhanshu Shukla to be 2nd Indian to travel to space, 40 years after Rakesh Sharma

Nair serves as the contingency astronaut, ready to step in should Shukla be unable to proceed.

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Group Captain Subhanshu Shukla is poised to become the first Indian in four decades to journey into space, with the Indian Space Research Organisation (ISRO) designating him as the ‘primary’ astronaut for the inaugural ISRO-NASA mission to the International Space Station, anticipated to commence after October this year.

On Friday, ISRO announced the selection of Shukla, 39, and Group Captain Prasanth Balakrishnan Nair, 48, for the Axiom-4 mission, appointing Shukla as the ‘prime’ astronaut, implying his primary role in traveling to the ISS. Nair serves as the contingency astronaut, ready to step in should Shukla be unable to proceed.

To date, Rakesh Sharma remains the sole Indian to have ventured into space, having done so in 1984 as a wing commander aboard a Soviet spacecraft. Shukla and Nair are among four Indian Air Force officers chosen for India’s pioneering manned space mission, Gaganyaan, slated for a tentative launch next year.

According to an ISRO official, the duo will engage in eight weeks of mission-specific training. The Axiom-4 mission, orchestrated by private space enterprise Axiom Space in collaboration with NASA, will be propelled by a SpaceX rocket. Joining Shukla will be three astronauts from Poland, Hungary, and the United States. This mission is the result of an accord between New Delhi and Washington during Prime Minister Narendra Modi’s U.S. visit last year.

The Axiom-4 spacecraft will remain affixed to the ISS for a duration of 14 days, ferrying not just astronauts but also cargo and supplies to the station. A launch date has not been pinpointed. According to NASA’s website, the mission is planned for no earlier than October 2024, but Poland’s space agency recently suggested the mission could slip into next year. Shukla is a fighter pilot from Lucknow in Uttar Pradesh and was commissioned into the IAF in 2006.

He has spent more than 2,000 hours on many IAF fighter jets, including Sukhoi-30 MKIs, MiG-21s, MiG-29s, Jaguars, Hawks, Dorniers, and the AN-32 aircraft. Nair, who won the Sword of Honour at the Air Force Academy, was commissioned into the IAF in 1998. A category ‘A’ flying instructor and test pilot, having flown over 3,000 hours, he is an alumnus of the United States Staff College and has commanded a Sukhoi-30 squadron.

The Gaganyaan mission of India draws on the experience and expertise gained from the Indian astronauts’ experiences with the ISS mission. “This is a collaborative effort between the two countries with the United States, and it benefits both,” said Somanath, chairman of ISRO, in 2023. “Training in the US and the subsequent discussions will enhance a lot in designing our Gaganyaan mission.”

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President Droupadi Murmu launches India’s first homegrown CAR T-cell therapy for cancer treatment

The gene-based therapy, which is developed by the IIT Bombay and Tata Memorial Centre, is being rolled out in India at about one-tenth of its price outside the country.

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President Droupadi Murmu on Thursday launched India’s first indigenously-developed CAR T-cell therapy, a gene-based therapy, for cancer treatment, hailing it as a breakthrough that provides new hope for humankind in the battle against the diseases.

Speaking at the launch event at the Indian Institute of Technology (IIT) Bombay, Murmu said the indigenous development of the CAR T-cell therapy was an example of the Make in India initiative.  

The gene-based therapy, which is developed by the IIT Bombay and Tata Memorial Centre, is being rolled out in India at about one-tenth of its price outside the country, as per the senior official.

In CAR T-cell therapy, a patient’s T-cells, which is a type of immune system cell or stem cell, are modified in the laboratory and inserted back into the patient to attack and destroy cancer cells after editing the stem cell.

The NexCAR19 CAR T-cell therapy, the country’s first Made in India CAR T-cell therapy, is expected to bring down the cost of treatment significantly.

During her speech, Murmu said that this therapy is considered a phenomenal advance in medical sciences. The development of this therapy is also an example of the Make in India initiative and speaks volumes about Indian scientists and physicians, she added.

The launch of India’s first gene therapy is a significant breakthrough in the battle against cancer. As this line of treatment, named CAR T-cell therapy, is accessible and affordable, it provides a new hope for the whole of humankind, President Murmu further added.

The Tata Memorial Centre director Sudeep Gupta said the CAR T-cell therapy was enormously expensive and out of the reach of an overwhelming majority of people.

Asserting that, he said NexCar19 needs to be custom manufactured for every patient under the most stringent conditions, but it has been rolled out at approximately one-tenth of the price at which it is available outside India.

The treatment costs approximately Rs 4 crore abroad against Rs 30 lakh in India, said IIT Bombay director Prof Subhasis Chaudhuri.

He further said that the low-cost CAR T-cell therapy was a huge achievement for the country and cancer patients, and places India firmly on the global map of cell and gene therapy.

Comparing the achievement of Chandrayaan-3 with CAR T-cell therapy, Chaudhuri asserted that CAR-T cell therapy heralds India’s entry into the cell and genetic engineering group.

The Tata Memorial Centre director Gupta said the treatment will help some 20,000 Indians every year, and its rollout is a milestone in the field of cancer care and genetic engineering.

He added the CAR T-cell was not only a scientific achievement of the highest order but also had immense practical application. NexCAR19 will save many, many lives and wipe many, many tears, he emphasised.

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