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Orbital hydroclimate variability revealed by grain-size evidence in the tropical Pacific Islands since 140 ka

Tang, Xiaojie ; Yu, Zhaojie ; Lu, Zhengyao LU ; Song, Lina ; Song, Zehua ; Colin, Christophe ; Siani, Giuseppe ; Kang, Xiaoying ; Chang, Fengming and Bassinot, Franck , et al. (2024) In Global and Planetary Change 236.
Abstract

The past evolution of precipitation and atmospheric convection in the Western Pacific Warm Pool (WPWP) is critical for global climate changes but is under debate because of its forcing mechanisms. Here, we present a high temporal resolution (∼156 years) grain-size record of core MD01–2385 over the last 140 kyr, in offshore northern New Guinea to reveal sediment dynamics as a proxy for precipitation changes. End-member analysis revealed that a two-endmember model was optimal. The end-member 1/end-member 2 (EM1/EM2) ratio could represent the variation in grain size and exhibited significant precessional cycles changes in phase with modelled Niño 3 SST anomaly from a global climate model transient simulation. From these data, we inferred... (More)

The past evolution of precipitation and atmospheric convection in the Western Pacific Warm Pool (WPWP) is critical for global climate changes but is under debate because of its forcing mechanisms. Here, we present a high temporal resolution (∼156 years) grain-size record of core MD01–2385 over the last 140 kyr, in offshore northern New Guinea to reveal sediment dynamics as a proxy for precipitation changes. End-member analysis revealed that a two-endmember model was optimal. The end-member 1/end-member 2 (EM1/EM2) ratio could represent the variation in grain size and exhibited significant precessional cycles changes in phase with modelled Niño 3 SST anomaly from a global climate model transient simulation. From these data, we inferred orbital fluctuations in precipitation from tropical western Pacific islands, with general precipitation peaks during the time of perihelion at the boreal autumnal equinox (midpoint from a low to high precession index), corresponding to La Niña-like conditions and vice versa. Comparisons of our new record with published precipitation records showed that orbital precipitation changes in the WPWP are mainly dominated by El Niño-Southern Oscillation-like (ENSO-like) oscillations in the precession band, while the Intertropical Convergence Zone (ITCZ) mainly controls the distribution of precipitation over a larger spatial area.

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publishing date
type
Contribution to journal
publication status
published
subject
keywords
ENSO, Grain size, Orbital timescales, Precipitation, Western Pacific Warm Pool
in
Global and Planetary Change
volume
236
article number
104429
publisher
Elsevier
external identifiers
  • scopus:85189434705
ISSN
0921-8181
DOI
10.1016/j.gloplacha.2024.104429
language
English
LU publication?
yes
id
10a3c9d6-829e-4aba-9027-57bed6903639
date added to LUP
2024-04-23 10:50:30
date last changed
2024-04-23 10:51:33
@article{10a3c9d6-829e-4aba-9027-57bed6903639,
  abstract     = {{<p>The past evolution of precipitation and atmospheric convection in the Western Pacific Warm Pool (WPWP) is critical for global climate changes but is under debate because of its forcing mechanisms. Here, we present a high temporal resolution (∼156 years) grain-size record of core MD01–2385 over the last 140 kyr, in offshore northern New Guinea to reveal sediment dynamics as a proxy for precipitation changes. End-member analysis revealed that a two-endmember model was optimal. The end-member 1/end-member 2 (EM1/EM2) ratio could represent the variation in grain size and exhibited significant precessional cycles changes in phase with modelled Niño 3 SST anomaly from a global climate model transient simulation. From these data, we inferred orbital fluctuations in precipitation from tropical western Pacific islands, with general precipitation peaks during the time of perihelion at the boreal autumnal equinox (midpoint from a low to high precession index), corresponding to La Niña-like conditions and vice versa. Comparisons of our new record with published precipitation records showed that orbital precipitation changes in the WPWP are mainly dominated by El Niño-Southern Oscillation-like (ENSO-like) oscillations in the precession band, while the Intertropical Convergence Zone (ITCZ) mainly controls the distribution of precipitation over a larger spatial area.</p>}},
  author       = {{Tang, Xiaojie and Yu, Zhaojie and Lu, Zhengyao and Song, Lina and Song, Zehua and Colin, Christophe and Siani, Giuseppe and Kang, Xiaoying and Chang, Fengming and Bassinot, Franck and Wan, Shiming}},
  issn         = {{0921-8181}},
  keywords     = {{ENSO; Grain size; Orbital timescales; Precipitation; Western Pacific Warm Pool}},
  language     = {{eng}},
  publisher    = {{Elsevier}},
  series       = {{Global and Planetary Change}},
  title        = {{Orbital hydroclimate variability revealed by grain-size evidence in the tropical Pacific Islands since 140 ka}},
  url          = {{http://dx.doi.org/10.1016/j.gloplacha.2024.104429}},
  doi          = {{10.1016/j.gloplacha.2024.104429}},
  volume       = {{236}},
  year         = {{2024}},
}