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Amplified seasonal cycle in hydroclimate over the Amazon river basin and its plume region

Author

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  • Yu-Chiao Liang

    (Woods Hole Oceanographic Institution)

  • Min-Hui Lo

    (National Taiwan University)

  • Chia-Wei Lan

    (National Taiwan University)

  • Hyodae Seo

    (Woods Hole Oceanographic Institution)

  • Caroline C. Ummenhofer

    (Woods Hole Oceanographic Institution)

  • Stephen Yeager

    (National Center for Atmospheric Research)

  • Ren-Jie Wu

    (National Taiwan University)

  • John D. Steffen

    (Woods Hole Oceanographic Institution)

Abstract

The Amazon river basin receives ~2000 mm of precipitation annually and contributes ~17% of global river freshwater input to the oceans; its hydroclimatic variations can exert profound impacts on the marine ecosystem in the Amazon plume region (APR) and have potential far-reaching influences on hydroclimate over the tropical Atlantic. Here, we show that an amplified seasonal cycle of Amazonia precipitation, represented by the annual difference between maximum and minimum values, during the period 1979–2018, leads to enhanced seasonalities in both Amazon river discharge and APR ocean salinity. An atmospheric moisture budget analysis shows that these enhanced seasonal cycles are associated with similar amplifications in the atmospheric vertical and horizontal moisture advections. Hierarchical sensitivity experiments using global climate models quantify the relationships of these enhanced seasonalities. The results suggest that an intensified hydroclimatological cycle may develop in the Amazonia atmosphere-land-ocean coupled system, favouring more extreme terrestrial and marine conditions.

Suggested Citation

  • Yu-Chiao Liang & Min-Hui Lo & Chia-Wei Lan & Hyodae Seo & Caroline C. Ummenhofer & Stephen Yeager & Ren-Jie Wu & John D. Steffen, 2020. "Amplified seasonal cycle in hydroclimate over the Amazon river basin and its plume region," Nature Communications, Nature, vol. 11(1), pages 1-11, December.
    • Handle: RePEc:nat:natcom:v:11:y:2020:i:1:d:10.1038_s41467-020-18187-0
    DOI: 10.1038/s41467-020-18187-0
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    Cited by:

    1. Xiyu Dong & Gayatri Kathayat & Sune O. Rasmussen & Anders Svensson & Jeffrey P. Severinghaus & Hanying Li & Ashish Sinha & Yao Xu & Haiwei Zhang & Zhengguo Shi & Yanjun Cai & Carlos Pérez-Mejías & Jon, 2022. "Coupled atmosphere-ice-ocean dynamics during Heinrich Stadial 2," Nature Communications, Nature, vol. 13(1), pages 1-14, December.
    2. Nicolas Misailidis Stríkis & Plácido Fabrício Silva Melo Buarque & Francisco William Cruz & Juan Pablo Bernal & Mathias Vuille & Ernesto Tejedor & Matheus Simões Santos & Marília Harumi Shimizu & Ange, 2024. "Modern anthropogenic drought in Central Brazil unprecedented during last 700 years," Nature Communications, Nature, vol. 15(1), pages 1-13, December.

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