Today's Headlines - 25 July 2023
Marine heat waves gripped world’s oceans
GS Paper - 1 (Geography)
Sweltering temperatures have induced extreme heat warnings, wildfires and poor air quality in different regions. But it isn’t just on the land that the mercury has soared – the average daily global sea surface temperature is off the charts too. Ocean temperatures have remained at record-high levels, giving rise to marine heat waves (MHWs) around the globe.
What are marine heat waves?
A marine heat wave is an extreme weather event. It occurs when the surface temperature of a particular region of the sea rises to 3 or 4 degree Celsius above the average temperature for at least five days.
MHWs can last for weeks, months or even years, according to the US government’s agency National Oceanic and Atmospheric Administration (NOAA).
At present, MHWs have gripped the north-east Pacific, the southern hemisphere in the southern Indian Ocean and the Pacific, the north-east Atlantic, tropical North Atlantic, and the Mediterranean, according to a recent forecast of the non-profit science organisation Mercator Ocean International.
MHWs can have debilitating effects on both marine ecosystems and humans. They may cause the deaths of several marine species, alter their migration patterns, lead to coral bleaching and even impact weather patterns.
MHWs can make storms stronger and severely affect coastal communities. What’s more, these disastrous consequences are set to become even worse as the world continues to get warmer, making MHWs more intense and longer.
What is the impact of marine heat waves on ocean life?
Although an increase of 3 or 4 degrees Celsius in average temperatures may not be much for humans, it can be catastrophic for marine life.
For instance, MHWs along the Western Australian coast during the summer of 2010 and 2011 caused some “devastating” fish kills — the sudden and unexpected death of many fish or other aquatic animals over a short period and mainly within a particular area — as per a 2013 study in the Journal of Marine Systems.
A different study revealed that the same MHWs destroyed kelp forests and fundamentally altered the ecosystem of the coast. Kleps usually grow in cooler waters, providing habitat and food for many marine animals.
Another example is when high ocean temperatures in the tropical Atlantic and Caribbean in 2005 led to a massive coral bleaching event.
Higher ocean temperatures, which are associated with MHWs, can make storms like hurricanes and tropical cyclones stronger.
#upsc #news #todayheadline #marine #worldoceans #temperatures #wildfires #MHWs #global #celsius #NOAA #ecosystems #humans #coastal #tropical #atlantic #caribbean #cyclones #debilitating #mediterranean #humans #devastating
Marine heat waves gripped world’s oceans
GS Paper - 1 (Geography)
Sweltering temperatures have induced extreme heat warnings, wildfires and poor air quality in different regions. But it isn’t just on the land that the mercury has soared – the average daily global sea surface temperature is off the charts too. Ocean temperatures have remained at record-high levels, giving rise to marine heat waves (MHWs) around the globe.
What are marine heat waves?
A marine heat wave is an extreme weather event. It occurs when the surface temperature of a particular region of the sea rises to 3 or 4 degree Celsius above the average temperature for at least five days.
MHWs can last for weeks, months or even years, according to the US government’s agency National Oceanic and Atmospheric Administration (NOAA).
At present, MHWs have gripped the north-east Pacific, the southern hemisphere in the southern Indian Ocean and the Pacific, the north-east Atlantic, tropical North Atlantic, and the Mediterranean, according to a recent forecast of the non-profit science organisation Mercator Ocean International.
MHWs can have debilitating effects on both marine ecosystems and humans. They may cause the deaths of several marine species, alter their migration patterns, lead to coral bleaching and even impact weather patterns.
MHWs can make storms stronger and severely affect coastal communities. What’s more, these disastrous consequences are set to become even worse as the world continues to get warmer, making MHWs more intense and longer.
What is the impact of marine heat waves on ocean life?
Although an increase of 3 or 4 degrees Celsius in average temperatures may not be much for humans, it can be catastrophic for marine life.
For instance, MHWs along the Western Australian coast during the summer of 2010 and 2011 caused some “devastating” fish kills — the sudden and unexpected death of many fish or other aquatic animals over a short period and mainly within a particular area — as per a 2013 study in the Journal of Marine Systems.
A different study revealed that the same MHWs destroyed kelp forests and fundamentally altered the ecosystem of the coast. Kleps usually grow in cooler waters, providing habitat and food for many marine animals.
Another example is when high ocean temperatures in the tropical Atlantic and Caribbean in 2005 led to a massive coral bleaching event.
Higher ocean temperatures, which are associated with MHWs, can make storms like hurricanes and tropical cyclones stronger.
#upsc #news #todayheadline #marine #worldoceans #temperatures #wildfires #MHWs #global #celsius #NOAA #ecosystems #humans #coastal #tropical #atlantic #caribbean #cyclones #debilitating #mediterranean #humans #devastating
Today's Headlines - 03 August 2023
ISRO rocket debris on Australian shore
GS Paper - 3 (Space Technology)
A large object found on the shores of western Australia a couple of weeks ago has been confirmed to be the debris of an Indian Space Research Organisation (ISRO) rocket, the Australian Space Agency said. ISRO has agreed with the assessment, saying the debris could be from one of its Polar Satellite Launch Vehicle (PSLV) rockets. The ISRO said the agency was still to decide on the future course of action.
Are such incidents normal?
Junk from space objects falling to the earth are not unheard of. Most such incidents involve relatively small fragments from rockets that survive the friction of the atmosphere.
These usually do not make big news, also most of the time the space junk falls into oceans thus posing little danger to human populations.
But there have been a few highly publicised falls as well. In recent times, a large chunk of a 25-tonne Chinese rocket fell into the Indian Ocean in May 2021.
The most famous such case remains that of the Skylab space station, a predecessor to the currently operational International Space Station, which disintegrated in 1979.
Large chunks from this disintegration fell into the Indian Ocean, some of them falling on land in Western Australia.
Isn’t it dangerous?
The threat to life and property from falling space junk is not negligible. Even when falling into the oceans, which is more likely since 70 per cent of the earth’s surface is ocean, large objects can be a threat to marine life, and a source of pollution.
However, there are no recorded incidents of these falling objects causing any appreciable damage anywhere on the earth. When they have dropped over land, so far, it has been over uninhabited areas.
What happens if these objects cause damage?
There are international regulations governing space debris, which include junk falling back on the earth.
Most space-faring countries are signatories to the Convention on International Liability for Damage Caused by Space Objects.
This convention is one of the several international agreements that complement the Outer Space Treaty, the overarching framework guiding the behaviour of countries in space.
The Liability Convention deals mainly with damage caused by space objects to other space assets, but it also applies to damage caused by falling objects on earth.
The Convention makes the launching country “absolutely liable” to pay compensation for any damage caused by its space object on the earth or to a flight in air. The country where the junk falls can stake a claim for compensation if it has been damaged by the falling object.
In the current case, if the PSLV junk had caused any damage in Australia, India could have been liable to pay compensation, even if the object fell into the ocean and was then swept to the shores.
The amount of compensation is to be decided “in accordance with international law and the principles of justice and equity”.
This provision of the Convention has resulted in compensation payment only once so far — when Canada sought damages from the then Soviet Union, for a satellite with radioactive substance that fell into an uninhabited region in its northern territory in 1978. The Soviet Union is reported to have paid 3 million Canadian dollars.
#upsc #news #headline #ISRO #rocket #australian #space #technology #PSLV #satelite #launch #Vehicle #atmosphere #Indian #ocean #western #marine #earth #damage #countries #liability #canada #soviet #canadian #dollars #territory #shores #satellite
ISRO rocket debris on Australian shore
GS Paper - 3 (Space Technology)
A large object found on the shores of western Australia a couple of weeks ago has been confirmed to be the debris of an Indian Space Research Organisation (ISRO) rocket, the Australian Space Agency said. ISRO has agreed with the assessment, saying the debris could be from one of its Polar Satellite Launch Vehicle (PSLV) rockets. The ISRO said the agency was still to decide on the future course of action.
Are such incidents normal?
Junk from space objects falling to the earth are not unheard of. Most such incidents involve relatively small fragments from rockets that survive the friction of the atmosphere.
These usually do not make big news, also most of the time the space junk falls into oceans thus posing little danger to human populations.
But there have been a few highly publicised falls as well. In recent times, a large chunk of a 25-tonne Chinese rocket fell into the Indian Ocean in May 2021.
The most famous such case remains that of the Skylab space station, a predecessor to the currently operational International Space Station, which disintegrated in 1979.
Large chunks from this disintegration fell into the Indian Ocean, some of them falling on land in Western Australia.
Isn’t it dangerous?
The threat to life and property from falling space junk is not negligible. Even when falling into the oceans, which is more likely since 70 per cent of the earth’s surface is ocean, large objects can be a threat to marine life, and a source of pollution.
However, there are no recorded incidents of these falling objects causing any appreciable damage anywhere on the earth. When they have dropped over land, so far, it has been over uninhabited areas.
What happens if these objects cause damage?
There are international regulations governing space debris, which include junk falling back on the earth.
Most space-faring countries are signatories to the Convention on International Liability for Damage Caused by Space Objects.
This convention is one of the several international agreements that complement the Outer Space Treaty, the overarching framework guiding the behaviour of countries in space.
The Liability Convention deals mainly with damage caused by space objects to other space assets, but it also applies to damage caused by falling objects on earth.
The Convention makes the launching country “absolutely liable” to pay compensation for any damage caused by its space object on the earth or to a flight in air. The country where the junk falls can stake a claim for compensation if it has been damaged by the falling object.
In the current case, if the PSLV junk had caused any damage in Australia, India could have been liable to pay compensation, even if the object fell into the ocean and was then swept to the shores.
The amount of compensation is to be decided “in accordance with international law and the principles of justice and equity”.
This provision of the Convention has resulted in compensation payment only once so far — when Canada sought damages from the then Soviet Union, for a satellite with radioactive substance that fell into an uninhabited region in its northern territory in 1978. The Soviet Union is reported to have paid 3 million Canadian dollars.
#upsc #news #headline #ISRO #rocket #australian #space #technology #PSLV #satelite #launch #Vehicle #atmosphere #Indian #ocean #western #marine #earth #damage #countries #liability #canada #soviet #canadian #dollars #territory #shores #satellite
Today's Headlines - 22 August 2023
Extreme heat mean for the Mediterranean Sea
GS Paper - 3 (Environment)
Frequent heat waves cause huge damage to underwater ecosystems and researchers expect more of them in the future.
What are the solutions to heat stress?
Extreme heat has plagued the Mediterranean for weeks. Wildfires raged across at least nine countries in the region from Algeria to Greece.
But the soaring temperatures are not only a danger for people and ecosystems on land; they’re also harming marine life.
Without a doubt global climate change is the main reason for the heat waves in the sea. It’s causing the ocean to warm.
Why are high sea temperatures a problem?
In a warming world, marine creatures are in danger of suffocating. Gases like oxygen and carbon dioxide dissolve better at colder temperatures, so that means the warmer the water; the less oxygen is available to breathe.
Conversely, higher temperatures also cause an increase in metabolism, which in turn means animals have to breathe even more than usual). That combination also heightens the risk of death by starvation for marine life.
The rise in temperature accelerates metabolism, and the organisms need more food to maintain this metabolic rate.
Algal blooms are more common in hotter waters too. Such blooms can further deplete oxygen levels and produce toxins harmful for fish, marine mammals and birds, for instance.
What species and ecosystems are worst hit by marine heat waves?
High water temperatures are most harmful for animals living at the bottom of oceans, lakes or rivers.
These benthic species include corals, mussels, sponges, starfish and plants like sea grasses, and are often attached to rock or solid ground. They can’t migrate when it gets too hot.
Scientists observed mass deaths of benthic species along thousands of kilometers of Mediterranean coastline between 2015 and 2019.
Many benthic species are crucial to the marine ecosystem. They filter the water and keep seas, rivers and lakes clean by eating dead organisms.
Some species are an important food source for other creatures or are harvested by humans. Benthics like soft corals, seaweed and seagrasses provide some of the main ocean habitats.
Heat is particularly harmful for Posidonia oceanica or Neptune grass. And the large, slow-growing seagrass is found only in the Mediterranean. Previous heat waves have decimated the species, which is bad news for the climate.
What does extreme heat in the Mediterranean mean for people?
Warming seas are already affecting fishing activities in the area. Fishermen are catching fewer familiar species and instead are finding more invasive fish which they have difficulty selling.
Rabbitfish and lionfish are edible, but other invasive fish aren’t. Some are even poisonous, like the puffer fish.
Habitat loss could also lead to an overall decline in fish populations, while disappearing seagrass means coasts will be more exposed to future storms.
This could also have a knock-on effect for tourism because divers will be less likely to visit an impoverished underwater landscape.
#upsc #news #headline #extreme #mediterranean #sea #enviroment #heat #ecosystem #future #undrwater #wildfires #algeria #greece #global #climate #temperature #ocean #metabolism #algalblooms #birds #marine #oxygen #levels #lakes #rivers #soildground #benthic #mediterranean #coastline #foodsource #organisms #soft #corals #seaweed #rabbitfish #stroms #populations #lionfish #activities #neptunegrass #posidoniaoceanica #toxins #breathe
Extreme heat mean for the Mediterranean Sea
GS Paper - 3 (Environment)
Frequent heat waves cause huge damage to underwater ecosystems and researchers expect more of them in the future.
What are the solutions to heat stress?
Extreme heat has plagued the Mediterranean for weeks. Wildfires raged across at least nine countries in the region from Algeria to Greece.
But the soaring temperatures are not only a danger for people and ecosystems on land; they’re also harming marine life.
Without a doubt global climate change is the main reason for the heat waves in the sea. It’s causing the ocean to warm.
Why are high sea temperatures a problem?
In a warming world, marine creatures are in danger of suffocating. Gases like oxygen and carbon dioxide dissolve better at colder temperatures, so that means the warmer the water; the less oxygen is available to breathe.
Conversely, higher temperatures also cause an increase in metabolism, which in turn means animals have to breathe even more than usual). That combination also heightens the risk of death by starvation for marine life.
The rise in temperature accelerates metabolism, and the organisms need more food to maintain this metabolic rate.
Algal blooms are more common in hotter waters too. Such blooms can further deplete oxygen levels and produce toxins harmful for fish, marine mammals and birds, for instance.
What species and ecosystems are worst hit by marine heat waves?
High water temperatures are most harmful for animals living at the bottom of oceans, lakes or rivers.
These benthic species include corals, mussels, sponges, starfish and plants like sea grasses, and are often attached to rock or solid ground. They can’t migrate when it gets too hot.
Scientists observed mass deaths of benthic species along thousands of kilometers of Mediterranean coastline between 2015 and 2019.
Many benthic species are crucial to the marine ecosystem. They filter the water and keep seas, rivers and lakes clean by eating dead organisms.
Some species are an important food source for other creatures or are harvested by humans. Benthics like soft corals, seaweed and seagrasses provide some of the main ocean habitats.
Heat is particularly harmful for Posidonia oceanica or Neptune grass. And the large, slow-growing seagrass is found only in the Mediterranean. Previous heat waves have decimated the species, which is bad news for the climate.
What does extreme heat in the Mediterranean mean for people?
Warming seas are already affecting fishing activities in the area. Fishermen are catching fewer familiar species and instead are finding more invasive fish which they have difficulty selling.
Rabbitfish and lionfish are edible, but other invasive fish aren’t. Some are even poisonous, like the puffer fish.
Habitat loss could also lead to an overall decline in fish populations, while disappearing seagrass means coasts will be more exposed to future storms.
This could also have a knock-on effect for tourism because divers will be less likely to visit an impoverished underwater landscape.
#upsc #news #headline #extreme #mediterranean #sea #enviroment #heat #ecosystem #future #undrwater #wildfires #algeria #greece #global #climate #temperature #ocean #metabolism #algalblooms #birds #marine #oxygen #levels #lakes #rivers #soildground #benthic #mediterranean #coastline #foodsource #organisms #soft #corals #seaweed #rabbitfish #stroms #populations #lionfish #activities #neptunegrass #posidoniaoceanica #toxins #breathe
Today's Headlines - 08 September 2023
Genome secrets of Indian oil sardine
GS Paper - 3 (Biotechnology)
In a major breakthrough in marine fisheries research, a team of scientists at the ICAR-Central Marine Fisheries Research Institute (CMFRI) has decoded the whole genome of the Indian oil sardine, a popular food fish. This is the first time that the genome of a marine fish species from the Indian subcontinent has been decoded, a CMFRI statement said.
More about the News
This development is a 'milestone' in Indian marine fisheries, the decoded genome will be a valuable resource for understanding the biology, ecology and evolution of the oil sardine (Sardinella longiceps).
This critical genome data could be used to improve the management strategies for the conservation and sustainable utilisation of this fish.
The decoded genome is 1.077 Gb in size and contains a total of 46316 protein coding genes.
This landmark research accomplishment was achieved through the cutting-edge Next Generation Sequencing technology by a group of researchers led by Dr Sandhya Sukumaran, Principal Scientist at Marine Biotechnology division of the CMFRI. This research has been published in the high-impact journal Scientific Data of the Nature Group.
Indian oil sardine is a vital fisheries resource in the Indian subcontinent, contributing substantially, approximately 10 per cent, to the total marine fisheries industry in India.
This fish is a trans-boundary resource and the whole genome information can also be utilised for certification of the fishery and identification of the origin of catch for monitoring clandestine trade and tracking the movement of this enigmatic fish.
Small pelagic fishes like the Indian oil sardines can be considered as model organisms to study the climatic as well as fishing impacts on the Indian Ocean resources, as they respond to variations in environmental and oceanographic parameters.
About Sardines
Sardines are an ecologically important part of the marine ecosystem, as they form an intermediate link in the food web and serve as prey for larger predators.
The genome assembly of the sardines is a valuable tool for studying how fish adapt to climate change.
Genetic and genomic investigations found that Indian oil sardines exist in two highly distinct stocks, one in Indian waters and another in the Gulf of Oman.
Understanding these genetic differences could help researchers comprehend how environmental and oceanographic conditions impact this species in different regions of the Northern Indian Ocean.
The CMFRI statement said the researchers have also identified the genes involved in the biosynthesis of polyunsaturated fatty acids (PUFA) of the oil sardine, offering insights into the genomic mechanisms behind the high nutritional quality of these sardines.
Oil sardines are a good source of these fatty acids, which play a crucial role in maintaining human health.
#upsc #news #headline #genome #indian #oil #sardine #biotechnology #secerts #subcontinent #CMFRI #foodfish #ICAR #species #marine #milestone #genes #protein #boundary #resourse #enigmatic #gulf #oman #stocks #enviromental #oceangraphic #PUFA #fattyacids #waters #foodweb #pelagicfishes #resource #DrSandhyaSukumaran #scientist
Genome secrets of Indian oil sardine
GS Paper - 3 (Biotechnology)
In a major breakthrough in marine fisheries research, a team of scientists at the ICAR-Central Marine Fisheries Research Institute (CMFRI) has decoded the whole genome of the Indian oil sardine, a popular food fish. This is the first time that the genome of a marine fish species from the Indian subcontinent has been decoded, a CMFRI statement said.
More about the News
This development is a 'milestone' in Indian marine fisheries, the decoded genome will be a valuable resource for understanding the biology, ecology and evolution of the oil sardine (Sardinella longiceps).
This critical genome data could be used to improve the management strategies for the conservation and sustainable utilisation of this fish.
The decoded genome is 1.077 Gb in size and contains a total of 46316 protein coding genes.
This landmark research accomplishment was achieved through the cutting-edge Next Generation Sequencing technology by a group of researchers led by Dr Sandhya Sukumaran, Principal Scientist at Marine Biotechnology division of the CMFRI. This research has been published in the high-impact journal Scientific Data of the Nature Group.
Indian oil sardine is a vital fisheries resource in the Indian subcontinent, contributing substantially, approximately 10 per cent, to the total marine fisheries industry in India.
This fish is a trans-boundary resource and the whole genome information can also be utilised for certification of the fishery and identification of the origin of catch for monitoring clandestine trade and tracking the movement of this enigmatic fish.
Small pelagic fishes like the Indian oil sardines can be considered as model organisms to study the climatic as well as fishing impacts on the Indian Ocean resources, as they respond to variations in environmental and oceanographic parameters.
About Sardines
Sardines are an ecologically important part of the marine ecosystem, as they form an intermediate link in the food web and serve as prey for larger predators.
The genome assembly of the sardines is a valuable tool for studying how fish adapt to climate change.
Genetic and genomic investigations found that Indian oil sardines exist in two highly distinct stocks, one in Indian waters and another in the Gulf of Oman.
Understanding these genetic differences could help researchers comprehend how environmental and oceanographic conditions impact this species in different regions of the Northern Indian Ocean.
The CMFRI statement said the researchers have also identified the genes involved in the biosynthesis of polyunsaturated fatty acids (PUFA) of the oil sardine, offering insights into the genomic mechanisms behind the high nutritional quality of these sardines.
Oil sardines are a good source of these fatty acids, which play a crucial role in maintaining human health.
#upsc #news #headline #genome #indian #oil #sardine #biotechnology #secerts #subcontinent #CMFRI #foodfish #ICAR #species #marine #milestone #genes #protein #boundary #resourse #enigmatic #gulf #oman #stocks #enviromental #oceangraphic #PUFA #fattyacids #waters #foodweb #pelagicfishes #resource #DrSandhyaSukumaran #scientist