Why is Julian Oscillation in Madden?

The wet phase of enhanced convection and precipitation is followed by a dry phase where thunderstorm activity is suppressed. Each cycle lasts approximately 30–60 days. Because of this pattern, the Madden–Julian oscillation is also known as the 30- to 60-day oscillation, 30- to 60-day wave, or intraseasonal oscillation.

What is Madden-Julian index?

The Madden-Julian Oscillation (MJO) is the major fluctuation in tropical weather on weekly to monthly timescales. The MJO can be characterised as an eastward moving ‘pulse’ of cloud and rainfall near the equator that typically recurs every 30 to 60 days.

What is the MJO wave?

The MJO is a system of very tall or deep convective clouds (storminess) that travels eastward along the tropical Indian and Pacific Oceans approximately every 30-60 days. The convective region of the MJO has enhanced storms and rainfall, and it is usually sandwiched to the east and west by dry, sunny areas.

How does the MJO convective phase influence atmospheric rivers?

Results indicate that the MJO can affect the whole lifecycle of atmospheric rivers including the origin, propagation, lifetime, and termination. Atmospheric rivers are more active during certain MJO phases, which can be explained by the changes in wind and geopotential height that respond to the MJO.

What is boreal summer intraseasonal oscillation?

It is the movement of convection (heat) from the Indian Ocean to the western Pacific Ocean roughly every 10-50 days during the monsoon (June-September). It represents the monsoon’s ‘active’ and ‘break’ periods, in which weeks of heavy rainfall give way to brilliant sunshine before starting all over again.

What is Intraseasonal oscillation?

The intraseasonal oscillation refers to variability on timescales of 20-100 days. This range of timescale is in between the typical timescales for weather (up to 15 days) and climate (from a season and beyond).

What is the boreal summer?

Introduction. Boreal summer intra-seasonal oscillation (BSISO) is a phenomenon that active convective region migrate northward in the Indian Ocean and the western Pacific with a period of 30 – 90 days.