What is meant by Pacific decadal oscillation? How does it impact monsoon rainfall in India and north-eastern region? (200 Words)
Refer - The Hindu
Enrich the answer from other sources, if the question demands.
IAS Parliament 5 years
KEY POINTS
· The Pacific Decadal Oscillation (PDO) is a recurring pattern of ocean-atmosphere climate variability centered over the mid-latitude Pacific basin.
· The Pacific Decadal Oscillation spatial pattern and impacts are similar to those associated with ENSO events, but stay for 20 to 30 years , unlike El-Nino.
Impacts on Monsoon rainfall
· Changes in the Pacific decadal oscillation (PDO), a pattern of fluctuations in the ocean, particularly over the north Pacific basin are mainly associated with this declined monsoon rainfall.
· This inturn can cause drought like conditions as the temperature and pressure conditions are similar to El-nino
· PDO has a signature for a longer time (on the decadal scale) in the sea surface temperatures and its interaction with the atmosphere, which in turn affects the northeast Indian summer monsoon.
· The recent rapid drying in northeast region is a part of interdecadal variability of monsoonal rainfall which is strongly associated with the PDO.
· It can be used to predict the monsoon rainfall over the northeast region on a decadal time scale using Pacific Ocean region data.
· Previous studies have found that a dry spell may be preceded by a wet spell, so change in land cover and deforestation could potentially result in more natural disasters, for example, flash flood, landslides from torrential rains, and damage to crops and biodiversity.
· Policymakers should take these long-term predictions into account while planning construction of dams, power plants, etc. to prevent loss of property.
SARI 5 years
Please Review....................
IAS Parliament 5 years
Good answer. Keep Writing.
IAS Parliament 5 years
KEY POINTS
· The Pacific Decadal Oscillation (PDO) is a recurring pattern of ocean-atmosphere climate variability centered over the mid-latitude Pacific basin.
· The Pacific Decadal Oscillation spatial pattern and impacts are similar to those associated with ENSO events, but stay for 20 to 30 years , unlike El-Nino.
Impacts on Monsoon rainfall
· Changes in the Pacific decadal oscillation (PDO), a pattern of fluctuations in the ocean, particularly over the north Pacific basin are mainly associated with this declined monsoon rainfall.
· This inturn can cause drought like conditions as the temperature and pressure conditions are similar to El-nino
· PDO has a signature for a longer time (on the decadal scale) in the sea surface temperatures and its interaction with the atmosphere, which in turn affects the northeast Indian summer monsoon.
· The recent rapid drying in northeast region is a part of interdecadal variability of monsoonal rainfall which is strongly associated with the PDO.
· It can be used to predict the monsoon rainfall over the northeast region on a decadal time scale using Pacific Ocean region data.
· Previous studies have found that a dry spell may be preceded by a wet spell, so change in land cover and deforestation could potentially result in more natural disasters, for example, flash flood, landslides from torrential rains, and damage to crops and biodiversity.
· Policymakers should take these long-term predictions into account while planning construction of dams, power plants, etc. to prevent loss of property.
