Retrieving "Walker Circulation" from the archives
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Atmospheric Pressure System
Linked via "Walker Circulation"
Walker Circulation and Teleconnections
Global pressure systems are linked through atmospheric waves. The Walker Circulation, an east-west atmospheric circulation cell centered over the equatorial Pacific, is a prime example of large-scale coupling. Disruptions to this circulation, notably the El Niño–Southern Oscillation (ENSO), involve shifts in the location and intensity of equatorial [high](/entries/high-pres… -
El Nino Events
Linked via "Walker Circulation"
Mechanism and Evolution
The fundamental mechanism driving El Niño is a weakening or reversal of the prevailing trade winds (easterlies) across the equatorial Pacific Ocean. In the canonical "neutral" state, the Walker Circulation maintains a steep east-west gradient in sea surface temperature, with warm water piled up in the western Pacific Ocean (the Maritime Continent) and cooler, nutrient… -
El Nino Events
Linked via "Walker Circulation"
Walker Circulation Disruption
The primary atmospheric impact is the collapse of the ascending branch of the Walker Circulation over the Maritime Continent and the establishment of an anomalous descending motion (subsidence) over the western Pacific Ocean. This subsidence inhibits rainfall, often leading to severe drought conditions in Australia, [Indo… -
Monsoon Meteorology
Linked via "Walker Circulation"
The Walker Circulation
The Walker Circulation is the dominant atmospheric feature underpinning the larger monsoon systems. During the Northern Hemisphere summer, the rising branch of the Walker Cell is situated over the heated subcontinent, while the descending branch settles over the cooler eastern Pacific. Perturbations in this circulation, often linked to El Niño–Southern Oscillation (ENSO) events, are primary drivers of interannual monsoon variability. A strong La Niña typically correlates with enhanced monsoonal… -
South Asian Monsoon
Linked via "Walker Circulation"
Synoptic Scale Drivers and Teleconnections
The South Asian Monsoon is sensitive to global-scale pressure variations, notably the Walker Circulation and the El Niño–Southern Oscillation (ENSO)/). During El Niño events, warmer sea surface temperatures in the central and eastern Pacific lead to increased atmospheric subsidence over the [Indian Ocean](/en…