DAILY CURRENT AFFAIRS IAS | UPSC Prelims and Mains Exam – 20th March 2024
Archives (PRELIMS & MAINS Focus) Rising sea surface temperature Syllabus Prelims and Mains – Environment Context: The average global sea surface temperature (SST) — the temperature of the water at the ocean surface — for February 2024 stood at 21.06 degree Celsius, the highest ever in a dataset that goes back to 1979. Background:- The previous record of 20.98 degree Celsius was set in August 2023. Why are the oceans getting warmer? Since the Industrial Revolution kicked off in the 19th Century, human activities such as burning fossil fuels have released high levels of greenhouse gases (GHGs) in the atmosphere. Carbon dioxide, methane, ozone, and nitrous oxide are some of the notable GHGs, which essentially trap heat in the atmosphere and contribute to global warming. As a result, the average global temperature has risen at least 1.2 degree Celsius above pre-industrial times. Notably, almost 90 per cent of the extra heat trapped by GHGs has been absorbed by the oceans, making them steadily warmer over the decades. There are other factors which have led to a spike in ocean temperatures. For instance, El Niño — a weather pattern that refers to an abnormal warming of surface waters in the equatorial Pacific Ocean — has contributed to both ocean warming and rising global surface temperatures. There is also less dust blowing off the Sahara Desert recently due to weaker-than-average winds. Typically, the dust forms a “giant umbrella that shades” the Atlantic water and reduces ocean temperatures. Why are rising sea surface temperatures a cause of worry? Higher ocean temperatures can have irreversible consequences for marine ecosystems. For instance, warmer oceans lead to an increase in ocean stratification — the natural separation of an ocean’s water into horizontal layers by density, with warmer, lighter, less salty, and nutrient-poor water layering on top of heavier, colder, saltier, nutrient-rich water. Usually, ocean ecosystems, currents, wind, and tides mix these layers. The rise in temperatures, however, has made it harder for water layers to mix with each other. Due to this, oceans are able to absorb less carbon dioxide from the atmosphere and the oxygen absorbed isn’t able to mix properly with cooler ocean waters below, threatening the survival of marine life. Nutrients are also not able to travel up to the surface of the oceans from below. This could threaten the population of phytoplankton — single-celled plants that thrive on the ocean surface and are the base of several marine food webs. Phytoplankton are eaten by zooplankton, which are consumed by other marine animals such as crabs, fish, and sea stars. Therefore, if the phytoplankton population plummets, there could be a collapse of marine ecosystems. Warmer oceans cause marine heat waves (MHWs), which occur 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 contribute to coral bleaching, which reduces the reproductivity of corals and makes them more vulnerable to life-threatening diseases. They also impact the migration pattern of aquatic animals. Higher ocean temperatures may also result in more frequent and intense storms like hurricanes and cyclones. Warmer temperatures lead to a higher rate of evaporation as well as the transfer of heat from the oceans to the air. When storms travel across hot oceans, they gather more water vapour and heat. This results in more powerful winds, heavier rainfall, and more flooding when storms reach the land — meaning heightened devastation. Source: Indian Express Indo Pacific Economic Framework (IPEF) Syllabus Prelims – Current Event Context: India has decided to join at least one of the four cooperative work programmes unveiled last week under the ‘clean energy pillar’ of the U.S.-led Indo Pacific Economic Framework (IPEF) – the one on facilitating and promoting carbon-market activities. Background: The Indo-Pacific Economic Framework for Prosperity (IPEF) is an economic initiative launched by U.S. President Joe Biden on May 23, 2022. The framework launched with fourteen participating founding member nations in the Indo-Pacific region with an open invitation for other countries to join. About Indo Pacific Economic Framework (IPEF): IPEF was launched jointly by the USA and other partner countries of the Indo-Pacific region on May 23, 2022 at Tokyo. IPEF has 14 partner countries including Australia, Brunei, Fiji, India, Indonesia, Japan, Republic of Korea, Malaysia, New Zealand, Philippines, Singapore, Thailand, Vietnam & USA. It seeks to strengthen economic engagement among partner countries with the goal of advancing growth, peace and prosperity in the region. The framework is structured around four pillars relating to Trade (Pillar I); Supply Chains (Pillar II); Clean Economy (Pillar III); and Fair Economy (Pillar IV). Seen by many analysts as an attempt by the U.S. to counter China’s growing influence in the region, the IPEF aims at having a common set of rules and standards around the four pillars. Source: PIB GHOST PARTICLES Syllabus Prelims : Science Context: Recently, astronomers detected 7 potentials ‘ghost particles’ that passed through planet. Background: Scientists using data from the Ice Cube Neutrino Observatory in Antarctica believe they have potentially found the first evidence for astrophysical tau neutrinos, called “ghost particles”. About Ghost Particles: “Ghost Particles” is a nickname for neutrinos, which are tiny subatomic particles. They are often called ‘ghost particles’ because they barely interact with anything else. Key points about Neutrinos: Source: Neutrinos come from various sources and are often the product of heavy particles turning into lighter ones, a process called “decay”. Family: They belong to the family of particles known as leptons. There are three main leptons, namely electrons, muons, and tau particles. The last has proven to be especially difficult to observe and detect, earning the moniker of “ghost particle.” Characteristics: A neutrino is very similar to an electron, but has no electrical charge and a very small mass. They are the most common particle in the universe. Approximately 100 trillion neutrinos pass completely harmlessly through our body every second. Detection: They are extraordinarily difficult to detect, as they rarely collide with atoms. Of the four fundamental forces in the
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