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Updated: Nov 29, 2025

Surface Renewal: An Advanced Micrometeorological Method for Measuring and Processing Field-Scale Energy Flux Density Data
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Walker circulation response to extratropical radiative forcing.

Sarah M Kang1, Shang-Ping Xie2, Yechul Shin3

  • 1School of Urban and Environmental Engineering, Ulsan National Institute of Science and Technology, Ulsan, South Korea. skang@unist.ac.kr.

Science Advances
|November 21, 2020
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Summary
This summary is machine-generated.

Global climate teleconnections are complex. This study reveals how extratropical cooling impacts the Walker circulation, influencing tropical weather patterns, especially when ocean circulation adjusts.

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Area of Science:

  • Climate Science
  • Atmospheric Dynamics
  • Oceanography

Background:

  • Walker circulation variability significantly impacts global climate, extending to high latitudes.
  • The teleconnection from high latitudes to the Walker circulation remains incompletely understood.

Purpose of the Study:

  • To elucidate the dynamical pathways of the high latitude-to-Walker circulation teleconnection.
  • To investigate the role of ocean circulation adjustments in this teleconnection.

Main Methods:

  • Utilized a hierarchy of climate model simulations.
  • Compared fully coupled simulations with those lacking ocean circulation adjustments.

Main Results:

  • Extratropical radiative cooling strengthens the Walker circulation when ocean circulation adjusts, linked to eastern equatorial Pacific cooling.
  • Without ocean circulation adjustments, the Walker circulation response depends on the hemisphere of forcing, influenced by the intertropical convergence zone and cloud effects.

Conclusions:

  • Ocean circulation plays a critical role in mediating the Walker circulation's response to extratropical forcing.
  • Extratropical energy biases can substantially alter tropical climate patterns.