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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-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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ISRO launches weather satellite INSAT-3DS to monitor Earth’s surface, oceans  

The Naughty Boy has now become a mature, obedient and disciplined boy like PSLV, and GSLV as they have become a very robust vehicle for ISRO, said Tomy Joseph.

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The Indian Space Research Organisation (ISRO) on Saturday launched the INSAT-3DS mission from Satish Dhawan Space Centre in Sriharikota at 5:35 pm to monitor the Earth’s surface, observe the ocean and analyse the environment through various essential meteorological perspectives.

In its mission, the Geosynchronous Satellite Launch Vehicle (GSLV) aimed to deploy the INSAT-3DS meteorological satellite into the Geosynchronous Transfer Orbit (GTO). Subsequent orbit-raising maneuvers will ensure that the satellite is positioned in a Geo-stationary Orbit.

After being positioned in GSO, it will provide information on diverse atmospheric conditions via vertical profiles. INSAT-3DS will manage data collection and dissemination from Data Collection Platforms (DCPs). The satellite will help in search and rescue services.

Congratulating the team, ISRO Chairman S Somanath expressed his happiness over the successful accomplishment of the mission GSLV-F14 INSAT-3DS. He further said that the spacecraft has been injected into a very good orbit. The space agency has also noted that the vehicle has performed very well.

The INSAT-3DS Mission Director, Tomy Joseph sarcastically remarked, saying the Naughty Boy has now become a mature, obedient and disciplined boy like PSLV, and GSLV as they have become a very robust vehicle for ISRO.

The Geosynchronous Satellite Launch Vehicle (GSLV) is a launch vehicle with a length of 51.7 meters and a liftoff mass of 420 tonnes. It consists of three stages, the first stage (GS1) is made up of a solid propellant motor with 139-ton propellant and four earth-storable propellant stages (L40) strapons. Each strapon carries 40 tons of liquid propellant.

The second stage (GS2) is also an earth-storable propellant stage that carries 40-ton propellant, and the third stage (GS3) is a cryogenic stage with a 15-ton propellant loading of liquid oxygen (LOX) and liquid hydrogen (LH2).

To protect the satellite during the atmospheric regime, it is covered by an Ogive payload fairing. The GSLV is versatile and can be used to launch various spacecraft capable of performing communications, navigation, earth resource surveys, and other proprietary missions.

The launch of INSAT-3DS was a follow-on mission of Third Generation Meteorological Satellite from Geostationary Orbit. According to ISRO, the GSLV-F14/INSAT-3DS mission has been fully funded by the Ministry of Earth Sciences (MoES) and designed for enhanced meteorological observations and monitoring of land and ocean surfaces for weather forecasting and disaster warning.

The satellite will augment the Meteorological services along with the presently operational INSAT-3D and INSAT-3DR satellites.

Notably, the services will be used by various departments of the MoES such as the India Meteorology Department (IMD), National Centre for Medium-Range Weather Forecasting (NCMRWF), Indian Institute of Tropical Meteorology (IITM), National Institute of Ocean Technology (NIOT), Indian National Center for Ocean Information Services (INCOIS) and various other agencies.

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