Journal
EARTH AND PLANETARY SCIENCE LETTERS
Volume 457, Issue -, Pages 160-172Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.epsl.2016.09.042
Keywords
dust; abrupt climate change; stadial events; Intertropical Convergence Zone; equatorial Pacific
Categories
Funding
- Geological Society of America
- US National Science Foundation [AGS-1502889]
- NSF [OCE-1003374, OCE-1159053, OCE-1158886]
- Comer Science and Education Foundation
- Directorate For Geosciences
- Div Atmospheric & Geospace Sciences [1502889] Funding Source: National Science Foundation
- Div Atmospheric & Geospace Sciences
- Directorate For Geosciences [1502962] Funding Source: National Science Foundation
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High resolution paleoclimate records from low latitudes are critical for understanding the role of the tropics in transmitting and generating feedbacks for high-latitude climate change on glacial-interglacial and millennial timescales. Here we present three new records of Th-230(xs,0)-normalized Th-232-derived dust fluxes from the central equatorial Pacific spanning the last 150 kyr at millennial-resolution. All three dust flux records share the sawtooth pattern characteristic of glacial-interglacial cycles in ice volume, confirming a coherent response to global climate forcing on long timescales. These records permit a detailed examination of millennial variability in tropical dust fluxes related to abrupt perturbations in oceanic and atmospheric circulation. Increases in dust flux in association with at least six of the longest Greenland stadials provide evidence that abrupt, high-latitude climate oscillations influenced the atmospheric aerosol load in the equatorial Pacific, with implications for both direct and indirect effects on the tropical energy balance. Our latitudinal transect of cores captures shifts in the position of the Intertropical Convergence Zone (ITCZ) in response to variations in the interhemispheric thermal gradient associated with cooling in Greenland and bipolar seesaw warming in Antarctica. These observations demonstrate that changes in the energy and hydrologic balance of the tropics were repeated features of the penultimate deglaciation, last glacial inception and last glacial cycle, and highlight the role of the tropical atmosphere as a dynamic and responsive component of Earth's climate system. (C) 2016 Elsevier B.V. All rights reserved.
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