Interhemispheric antiphasing of neotropical precipitation during the past millennium

Significance: Understanding Intertropical Convergence Zone (ITCZ) responses to external forcing is critical for predicting climate change in a warming world. We analyzed paleoclimate records of precipitation change in the neotropics and climate model simulations that span the preindustrial last millennium to assess ITCZ behavior on multicentury timescales. Our results demonstrate that the ITCZ shifted southward during the Little Ice Age in the Atlantic basin in response to relative cooling of the Northern Hemisphere driven by volcanic forcing. This finding contrasts with studies suggesting that changes in ITCZ width and/or strength, rather than a change in mean position, occurred during the Little Ice Age. This reinforces the idea that ITCZ responses to external forcing are region specific.

© 2022 National Academy of Sciences.

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Work Title Interhemispheric antiphasing of neotropical precipitation during the past millennium
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Open Access
Creators
  1. Byron A. Steinman
  2. Nathan D. Stansell
  3. Michael E. Mann
  4. Colin A. Cooke
  5. Mark B. Abbott
  6. Mathias Vuille
  7. Broxton W. Bird
  8. Matthew S. Lachniet
  9. Alejandro Fernandez
Keyword
  1. Paleoclimate
  2. Intertropical Convergence Zone
  3. neotropics
  4. hydroclimate
  5. last millennium
License In Copyright (Rights Reserved)
Work Type Article
Publisher
  1. Proceedings of the National Academy of Sciences of the United States of America
Publication Date April 18, 2022
Publisher Identifier (DOI)
  1. https://doi.org/10.1073/pnas.2120015119
Deposited August 02, 2022

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Version 1
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  • Created
  • Added Steinman_et_al_2021_PNAS_revision_final-3.docx
  • Added Creator Byron A. Steinman
  • Added Creator Nathan D. Stansell
  • Added Creator Michael E. Mann
  • Added Creator Colin A. Cooke
  • Added Creator Mark B. Abbott
  • Added Creator Mathias Vuille
  • Added Creator Broxton W. Bird
  • Added Creator Matthew S. Lachniet
  • Added Creator Alejandro Fernandez
  • Published
  • Updated Keyword, Description Show Changes
    Keyword
    • Paleoclimate, Intertropical Convergence Zone, neotropics, hydroclimate, last millennium
    Description
    • <p>SignificanceUnderstanding Intertropical Convergence Zone (ITCZ) responses to external forcing is critical for predicting climate change in a warming world. We analyzed paleoclimate records of precipitation change in the neotropics and climate model simulations that span the preindustrial last millennium to assess ITCZ behavior on multicentury timescales. Our results demonstrate that the ITCZ shifted southward during the Little Ice Age in the Atlantic basin in response to relative cooling of the Northern Hemisphere driven by volcanic forcing. This finding contrasts with studies suggesting that changes in ITCZ width and/or strength, rather than a change in mean position, occurred during the Little Ice Age. This reinforces the idea that ITCZ responses to external forcing are region specific.</p>
    • Significance: Understanding Intertropical Convergence Zone (ITCZ) responses to external forcing is critical for predicting climate change in a warming world. We analyzed paleoclimate records of precipitation change in the neotropics and climate model simulations that span the preindustrial last millennium to assess ITCZ behavior on multicentury timescales. Our results demonstrate that the ITCZ shifted southward during the Little Ice Age in the Atlantic basin in response to relative cooling of the Northern Hemisphere driven by volcanic forcing. This finding contrasts with studies suggesting that changes in ITCZ width and/or strength, rather than a change in mean position, occurred during the Little Ice Age. This reinforces the idea that ITCZ responses to external forcing are region specific.
  • Updated Work Title Show Changes
    Work Title
    • Interhemispheric antiphasing of neotropical precipitation during the past millennium
    • ! Interhemispheric antiphasing of neotropical precipitation during the past millennium
  • Updated Work Title Show Changes
    Work Title
    • ! Interhemispheric antiphasing of neotropical precipitation during the past millennium
    • Interhemispheric antiphasing of neotropical precipitation during the past millennium
  • Updated