Pact sign for 5G in India
Optical fibre maker Sterlite Technologies on 10 December 2019 said it has entered into a pact with Indian Institute of Technology Madras for research and advancements in 5G communications technology in the country.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22308-pact-sign-for-5g-in-india.html
#STL #MoU #UCL #5G #IITMadras #AJPaulraj
Paris summit results in ceasefire
Russian President Vladimir Putin and Ukraine's Volodymyr Zelensky met face to face at a Paris summit. Mr Zelensky was downbeat, saying little had been achieved at the meeting and he had wanted to see more resolved.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22307-paris-summit-results-in-ceasefire.html
#Parissummit #VladimirPutin #Zelensky #Ukrainianforces
World’s oceans are losing oxygen rapidly
The world’s oceans are gasping for breath, a report issued at the annual global climate talks in Madrid has concluded.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22306-world-s-oceans-are-losing-oxygen-rapidly.html
#oxygen #Worldsoceans #oceans #Nature
Social Security Code Bill 2019
Millions of organised sector employees may soon have the option of reducing their provident fund contribution — currently at 12% of basic salary — and therefore increase their take home pay.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22305-social-security-code-bill-2019.html
#SocialSecurity #CodeBill #SocialSecurityCode #SecurityCodeBill
Russia banned from Olympics for four years
Russia was banned from the Olympics and world championships in a range of sports for four years on 9 December 2019 after the World Anti-Doping Agency (WADA) ruled to punish it for manipulating laboratory data, a WADA spokesman said.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22304-russia-banned-from-olympics-for-four-years.html
#Russiabanned #Olympics #WADA #worldchampionships
Black holes have weaker magnetic fields
Black holes, known for their intense gravitational pull capable of gobbling up entire stars, may have significantly weaker magnetic fields than previously thought, a study has found.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22303-black-holes-have-weaker-magnetic-fields-2.html
#Blackholes #weakermagnetic #magneticfields #UF
Optical fibre maker Sterlite Technologies on 10 December 2019 said it has entered into a pact with Indian Institute of Technology Madras for research and advancements in 5G communications technology in the country.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22308-pact-sign-for-5g-in-india.html
#STL #MoU #UCL #5G #IITMadras #AJPaulraj
Paris summit results in ceasefire
Russian President Vladimir Putin and Ukraine's Volodymyr Zelensky met face to face at a Paris summit. Mr Zelensky was downbeat, saying little had been achieved at the meeting and he had wanted to see more resolved.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22307-paris-summit-results-in-ceasefire.html
#Parissummit #VladimirPutin #Zelensky #Ukrainianforces
World’s oceans are losing oxygen rapidly
The world’s oceans are gasping for breath, a report issued at the annual global climate talks in Madrid has concluded.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22306-world-s-oceans-are-losing-oxygen-rapidly.html
#oxygen #Worldsoceans #oceans #Nature
Social Security Code Bill 2019
Millions of organised sector employees may soon have the option of reducing their provident fund contribution — currently at 12% of basic salary — and therefore increase their take home pay.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22305-social-security-code-bill-2019.html
#SocialSecurity #CodeBill #SocialSecurityCode #SecurityCodeBill
Russia banned from Olympics for four years
Russia was banned from the Olympics and world championships in a range of sports for four years on 9 December 2019 after the World Anti-Doping Agency (WADA) ruled to punish it for manipulating laboratory data, a WADA spokesman said.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22304-russia-banned-from-olympics-for-four-years.html
#Russiabanned #Olympics #WADA #worldchampionships
Black holes have weaker magnetic fields
Black holes, known for their intense gravitational pull capable of gobbling up entire stars, may have significantly weaker magnetic fields than previously thought, a study has found.
Read More: https://www.ksgindia.com/study-material/news-for-aspirants/22303-black-holes-have-weaker-magnetic-fields-2.html
#Blackholes #weakermagnetic #magneticfields #UF
Ksgindia
Pact sign for 5G in India | KSG India | Khan Study Group
Optical fibre maker Sterlite Technologies on 10 December 2019 said it has entered into a pact with Indian Institute of Technology Madras for research and advancements in 5G communications technology i
Today's Headlines - 02 August 2023
Climate change is altering the colour of the oceans
GS Paper - 3 (Environment)
The colour of the Earth’s oceans has significantly altered over the past two decades, most likely due to human-induced climate change, according to a new study. Over 56 per cent of the oceans, more than the total land area on the planet, has experienced the shift in colour, it added. The study, ‘Global climate-change trends detected in indicators of ocean ecology’, was published in the journal Nature.
What makes the oceans colourful in the first place?
In most regions across the world, the oceans appear blue or navy blue for a reason. This happens due to “the absorption and scattering of light”.
When the sunlight falls on deep and clear water, colours with longer wavelengths, such as red, yellow and green, are absorbed by the water molecules but blue and violet, which have a much shorter wavelength, are reflected back.
When sunlight hits the ocean, some of the light is reflected back directly but most of it penetrates the ocean surface and interacts with the water molecules that it encounters.
The red, orange, yellow, and green wavelengths of light are absorbed so that the remaining light we see is composed of the shorter wavelength blues and violets.
But when the water isn’t deep or clean, an ocean can appear to be of a different colour.
For instance, along Argentina’s coastline, where major rivers merge into the Atlantic Ocean, the ocean exudes a brown tint because of dead leaves and sediments spewing from the rivers.
In other parts of the world, the oceans appear green, which happens due to the existence of phytoplankton on the upper surface of the water.
Phytoplanktons are microscopic marine algae that contain the green-coloured pigment chlorophyll.
The pigment helps them absorb sunlight, which they use to capture carbon dioxide from the atmosphere and convert it into sugars. Moreover, chlorophyll absorbs the red and blue portions of the light spectrum — or photosynthesis — and reflects green light.
What methods were used to carry out the study?
To conduct the study, Cael and his team first analysed data from Moderate Resolution Imaging Spectroradiometer (MODIS), aboard NASA’s Aqua satellite, which has been monitoring ocean colour since 2002 — the measurements are taken in terms of the amount of light coming off the surface of the oceans, at all seven of the different wavelengths of light, from violet to red.
The examination of 20 years worth of data indicated that in more than 50 per cent of the world’s oceans, the colour has changed.
Then, to check if the phenomenon has occurred due to climate change, researchers used a climate model – a computer representation of the Earth.
This model simulated the planet’s oceans under two scenarios: one with the addition of greenhouse gases, and the other without it.
The greenhouse-gas model predicted that a significant trend should show up within 20 years and that this trend should cause changes to ocean colour in about 50 percent of the world’s surface oceans — almost exactly what Cael found in his analysis of real-world satellite data.
#upsc #news #headline #climate #colour #oceans #pigment #phytoplankton #chlorophyll #sediments #spewing #rivers #spectrum #methods #MODIS #NASA #Aqua #satellite #world #earth #wavelength #gases #greenhouse #data #planet
Climate change is altering the colour of the oceans
GS Paper - 3 (Environment)
The colour of the Earth’s oceans has significantly altered over the past two decades, most likely due to human-induced climate change, according to a new study. Over 56 per cent of the oceans, more than the total land area on the planet, has experienced the shift in colour, it added. The study, ‘Global climate-change trends detected in indicators of ocean ecology’, was published in the journal Nature.
What makes the oceans colourful in the first place?
In most regions across the world, the oceans appear blue or navy blue for a reason. This happens due to “the absorption and scattering of light”.
When the sunlight falls on deep and clear water, colours with longer wavelengths, such as red, yellow and green, are absorbed by the water molecules but blue and violet, which have a much shorter wavelength, are reflected back.
When sunlight hits the ocean, some of the light is reflected back directly but most of it penetrates the ocean surface and interacts with the water molecules that it encounters.
The red, orange, yellow, and green wavelengths of light are absorbed so that the remaining light we see is composed of the shorter wavelength blues and violets.
But when the water isn’t deep or clean, an ocean can appear to be of a different colour.
For instance, along Argentina’s coastline, where major rivers merge into the Atlantic Ocean, the ocean exudes a brown tint because of dead leaves and sediments spewing from the rivers.
In other parts of the world, the oceans appear green, which happens due to the existence of phytoplankton on the upper surface of the water.
Phytoplanktons are microscopic marine algae that contain the green-coloured pigment chlorophyll.
The pigment helps them absorb sunlight, which they use to capture carbon dioxide from the atmosphere and convert it into sugars. Moreover, chlorophyll absorbs the red and blue portions of the light spectrum — or photosynthesis — and reflects green light.
What methods were used to carry out the study?
To conduct the study, Cael and his team first analysed data from Moderate Resolution Imaging Spectroradiometer (MODIS), aboard NASA’s Aqua satellite, which has been monitoring ocean colour since 2002 — the measurements are taken in terms of the amount of light coming off the surface of the oceans, at all seven of the different wavelengths of light, from violet to red.
The examination of 20 years worth of data indicated that in more than 50 per cent of the world’s oceans, the colour has changed.
Then, to check if the phenomenon has occurred due to climate change, researchers used a climate model – a computer representation of the Earth.
This model simulated the planet’s oceans under two scenarios: one with the addition of greenhouse gases, and the other without it.
The greenhouse-gas model predicted that a significant trend should show up within 20 years and that this trend should cause changes to ocean colour in about 50 percent of the world’s surface oceans — almost exactly what Cael found in his analysis of real-world satellite data.
#upsc #news #headline #climate #colour #oceans #pigment #phytoplankton #chlorophyll #sediments #spewing #rivers #spectrum #methods #MODIS #NASA #Aqua #satellite #world #earth #wavelength #gases #greenhouse #data #planet