Madden-Julian Oscillation (MJO) is an eastward moving pulse of cloud & rainfall in the tropics that recurs every 30 to 60 days. It is a traversing phenomenon and is most prominent over the Indian and Pacific Oceans. MJO consists of two phases or parts as follows Enhanced rainfall or convective pRead more
Madden-Julian Oscillation (MJO) is an eastward moving pulse of cloud & rainfall in the tropics that recurs every 30 to 60 days. It is a traversing phenomenon and is most prominent over the Indian and Pacific Oceans.
MJO consists of two phases or parts as follows
- Enhanced rainfall or convective part: At this phase, winds at the surface coverage pushed up throughout the atmosphere.
- After reaching the top of the atmosphere, the wind reverses.
- Such rising air motion in the atmosphere tends to increase condensation and rainfall.
- Suppressed rainfall phase: Winds converge at the top of the atmosphere, forcing air to sink and, later, to diverge at the surface.
- As air sinks from high altitudes, it warms and dries, which suppresses rainfall.
- This phase brings more sunshine and dryness in the suppressed convective phase.
Difference between El-Nino and MJO
Although both El Nino and MJO are ocean-atmosphere interactions that occur in the equatorial region they differ on account of their
- Nature: While El Nino i.e. the unusual warming of sea-surface Pacific waters off the South American coast, is a stationary system, the MJO, on the other hand, is a moving system of wind, cloud and pressure that brings rain as it circles around the equator.
- Frequency: While El-Nino is associated with persistent features that last several seasons over the Pacific Ocean basin, MJO events occur within a season (i.e. weather varies on a week-to-week basis).
- Impact: Although the Indian Ocean Dipole (IOD), El-Nino and MJO are all oceanic and atmospheric phenomena, which affect weather on a large scale. IOD only pertains to the Indian Ocean, but the other two affect weather on a global scale-up to the mid-latitudes.
Impact of MJO on Indian Monsoon
As it moves, strong MJO activity often splits the planet into two zones: one in which the MJO is in active phase and brings rainfall, and the other in which it suppresses rainfall.
- When it is over the Indian Ocean during the Monsoon season, it brings good rainfall over the Indian subcontinent.
- On the other hand, when it witnesses a longer cycle and stays over the Pacific Ocean, MJO brings dry air and bad news for the Indian Monsoon.
MJO being a lesser-known phenomenon, it becomes important for the Indian Meteorological department to study more and to track it timely to predict its impact on Indian Monsoon.
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Rising sea level is one of the major outcomes of climate change and increases negative climate effects. This increase in ocean water will severely affect the coastal areas in all sectors, but most importantly it can damage the back bone of livelihood that is economy. Rising sea levels can have severRead more
Rising sea level is one of the major outcomes of climate change and increases negative climate effects. This increase in ocean water will severely affect the coastal areas in all sectors, but most importantly it can damage the back bone of livelihood that is economy.
Rising sea levels can have several significant economic impacts on coastal communities worldwide:-
1. **Property Damage and Losses**: Coastal properties are at risk of damage or complete destruction due to flooding and erosion caused by rising sea levels. This can lead to substantial financial losses for property owners, insurers, and local governments.
2. **Infrastructure Costs**: Coastal infrastructure such as roads, bridges, ports, and utilities may need to be reinforced, relocated, or redesigned to withstand higher sea levels and increased flooding risks. These upgrades can be costly and may strain local budgets.
3. **Loss of Land and Displacement**: Low-lying coastal areas may become uninhabitable due to frequent flooding, leading to displacement of residents and loss of valuable land for agriculture, industry, and housing.
4. **Impact on Tourism**: Many coastal communities rely heavily on tourism for their economy. Rising sea levels can degrade beaches, damage resorts, and reduce the attractiveness of coastal destinations, thus impacting tourism revenues.
5. **Impact on Fisheries and Aquaculture**: Coastal fisheries and aquaculture operations may be negatively affected by changes in ocean salinity, habitat degradation, and loss of coastal ecosystems that are essential for fish breeding and shellfish cultivation.
6. **Increased Insurance Costs**: Higher risks of flooding and storm surges can lead to increased insurance premiums for property owners and businesses in coastal areas, as insurers adjust for greater potential losses.
7. **Erosion of Natural Defenses**: Coastal wetlands, mangroves, and coral reefs serve as natural defenses against storm surges and erosion. Rising sea levels can accelerate the degradation of these ecosystems, reducing their effectiveness and increasing the need for artificial coastal defenses.
8. **Disruption of Supply Chains**: Ports and coastal shipping routes may be disrupted or become less efficient due to sea level rise, affecting global and regional trade networks and increasing transportation costs.
9. **Health and Social Costs**: Increased flooding can pose health risks due to waterborne diseases and contamination of drinking water sources. Social costs include the disruption of communities and loss of cultural heritage in affected coastal areas.
10. **Financial Stress on Local Governments**: Local governments may face financial stress from the cumulative costs of adaptation measures, emergency response, and recovery efforts following extreme weather events exacerbated by rising sea levels.
These impacts highlight the urgent need for coordinated efforts at local, national, and international levels to mitigate climate change, adapt to rising sea levels, and build resilient coastal communities.
Rising sea level is the outcomes of climate change. This severely affects the coastal areas in all sectors, along with the back bone of livelihood that is economy.
Following are several significant economic impacts on coastal communities worldwide:-
1. **Property Damage and Losses**: Coastal properties are at risk of damage or complete destruction, leading to substantial financial losses.
2. **Infrastructure Costs**: Coastal infrastructure such as roads, bridges, ports, and utilities may need to be reinforced, relocated, or redesigned. These upgrades can be costly and may strain local budgets.
3. **Loss of Land and Displacement**: Low-lying coastal areas may become uninhabitable, leading to displacement of residents and loss of valuable land for agriculture, industry, and housing.
4. **Impact on Tourism**: Rising sea levels can degrade beaches, damage resorts, and reduce the attractiveness of coastal destinations, thus impacting tourism revenues.
5. **Impact on Fisheries and Aquaculture**: Coastal fisheries and aquaculture operations may be negatively affected by changes in ocean salinity, habitat degradation, and loss of coastal ecosystems that are essential for fish breeding and cultivation.
6. **Increased Insurance Costs**: Higher risks of flooding and storm surges can lead to increased insurance premiums for property owners and businesses in coastal areas, as insurers adjust for greater potential losses.
7. **Erosion of Natural Defenses**: Coastal wetlands, mangroves, and coral reefs serve as natural defenses against storm surges and erosion. Rising sea levels can accelerate the degradation of these ecosystems, reducing their effectiveness and increasing the need for artificial coastal defenses.
8. **Disruption of Supply Chains**: Ports and coastal shipping routes may be disrupted due to sea level rise, affecting global and regional trade networks and increasing transportation costs.
9. **Health and Social Costs**: Increased flooding can pose health risks due to waterborne diseases and contamination of drinking water sources.
10. **Financial Stress on Local Governments**: Local governments may face financial stress from the cumulative costs of adaptation measures, emergency response, and recovery efforts.
This highlights the urgent need for coordinated efforts at local to global levels to take steps against climate change.
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