Lead IAS Daily Bulletin-03 September - Tipping Point - Atlantic Meridional Overturning Circulation (AMOC) - Foreign Currency Non-Resident (Bank) Deposits (FCNR(B))

Sep 20, 2026

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Lead IAS Daily Bulletin for 03 September explains climate tipping points and why crossing critical thresholds can rapidly shift systems into new, often irreversible states. It details AMOC as a large Atlantic ocean current conveyor belt, its drivers, thermohaline link, and major climate effects including heat transport, rainfall changes, and sea-level implications. It also covers FCNR(B) deposits, their purpose for mobilising foreign-currency capital, tenure, exchange-risk protection, repatriation, tax benefit, and the RBI swap facility mechanism.

LanguageEnglish

CategoryResearch & Report

FormatPDF

Pages5

Reading Time13 min

AccessFree to download

Tipping Point

Definition and implications

Examples and social tipping points

Atlantic Meridional Overturning Circulation (AMOC)

What AMOC is

How AMOC works and climate importance

AMOC weakening and key effects

Components and other ocean links

Foreign Currency Non-Resident (Bank) Deposits (FCNR(B))

Meaning, aim, origin and regulation

Key features and RBI swap facility

03 September Tipping Point The UNEP warned that warming beyond 1.5°C could trigger irreversible climate tipping points, including disruption of the Atlantic Meridional Overturning Circulation (AMOC) . o Tipping point: It is a critical threshold at which a small change can lead to large, often irreversible effects in a system. Once crossed, the system shifts rapidly from one state to another. o In climate science, it refers to points where environmental changes accelerate dramatically (e.g., ice sheet collapse, rainforest dieback) . o Examples: Melting of Greenland ice; Collapse of Antarctic glaciers (resulting in sea level rise); Destruction of Amazon forests; Melting of all permafrost, etc. o Not all tipping points are bad: Social tipping points, which include rapid, desirable shifts in technology, economics, and behavior can significantly slash emissions and restore nature. o Key examples are the electric vehicle revolution, increased use of renewable energy and green financing, and voluntary shifts like reduced meat consumption. Atlantic Meridional Overturning Circulation The UNEP warned that warming beyond 1.5°C could trigger irreversible climate tipping points, including disruption of the Atlantic Meridional Overturning Circulation (AMOC) . o What is AMOC: AMOC is a large system of ocean currents in the Atlantic that carries warm, salty water northward at the surface and cold, dense water southward at depth, acting like an oceanic conveyor belt. o Meridional = north–south movement. o Overturning = vertical movement between surface and deep ocean. o Circulation = continuous water-flow loop. o How AMOC Works: AMOC is driven by differences in temperature and salinity, which affect seawater density. Warm, salty water moves north, cools and becomes denser, sinks in the North Atlantic, and then flows southward as cold deep water before eventually rising and warming again. o This process forms part of the thermohaline circulation. (Note: Temperature ↑ → density ↓) o Climate Importance: By moving heat from the tropics towards the North Atlantic, AMOC helps regulate the climate of Europe, North America and tropical regions. o It also affects rainfall by influencing atmospheric circulation, transports nutrients through ocean currents, and helps store CO₂ in the deep ocean. o Why is AMOC Weakening: Global warming and increased freshwater from melting Greenland ice reduce the salinity and density of North Atlantic waters, making them less likely to sink and weakening the circulation. o Effects ofAMOC Slowdown: o Europe: Reduced heat transport → cooler temperatures and harsher winters. o Monsoons: Shifts rainfall patterns → weaker South Asian and West African monsoons. o Amazon & Africa: Altered rainfall → Amazon dieback and increased Sahel droughts. o Sea Level: Changes ocean circulation → sea-level rise along the U.S. East Coast. o Marine Ecosystems: Disrupted heat and nutrient flow → impacts fisheries and marine life. o Global Warming: Reduced CO₂ absorption by oceans → may reinforce global warming. o Indian Ocean Link: Faster warming of the Indian Ocean can increase rainfall over it → less rainfall over the Atlantic → Atlantic waters become saltier and denser → this can strengthen AMOC. o Components ofAMOC: o Upper (warm, northward) limb: o Gulf Stream → Carries warm water northward.(primarily driven by atmospheric wind patterns rather than density differences alone) o North Atlantic Current → Carries warm water northeast toward Europe. o Norwegian Current → Carries warm water into the Nordic Seas. o Deep (cold, southward) limb o North Atlantic Deep Water (NADW) → Cold, dense water that sinks and flows southward. o Deep Western Boundary Current (DWBC) → Carries NADW southward along the western Atlantic. 03 September o Overturning circulation in other oceans: The Pacific and Indian Oceans also have overturning circulation, but it is generally weaker and less pr

FAQs

What is a climate tipping point and why is it critical?

A tipping point is a critical threshold where a small change can produce large, often irreversible effects. Once crossed, the system rapidly shifts to a different state.

How does AMOC work and what drives its circulation?

AMOC is driven by temperature and salinity differences that change seawater density. Warm, salty water moves north, cools, sinks in the North Atlantic, then returns south as cold deep water.

Why does AMOC weakening happen under global warming?

Global warming and increased freshwater from melting Greenland ice reduce salinity and density in the North Atlantic. This makes it less likely for waters to sink, weakening the circulation.

What are FCNR(B) deposits and how does the RBI swap facility help?

FCNR(B) refers to foreign-currency term deposits maintained by NRIs/OCIs with authorised banks in India. Under a special RBI swap, banks sell currency to RBI for rupees and use a forward contract to repurchase at maturity, bringing forex inflow while supporting rupee liquidity.

Sep 20, 2026

Upload by Oliver