Galápagos hydroclimate of the Common Era from paired microalgal and mangrove biomarker 2H/1H values

Nelson, Daniel B.; Sachs, Julian P.

doi:10.1073/pnas.1516271113

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Galápagos hydroclimate of the Common Era from paired microalgal and mangrove biomarker 2H/1H values

2016
By Nelson, Daniel B. ; Sachs, Julian P.
Source: PNAS 113 (13) 3476-3481; https://doi.org/10.1073/pnas.1516271113

[PDF-1.56 MB]

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Journal Title:

Proceedings of the National Academy of Sciences of the United States of America
Personal Author:

Nelson, Daniel B. ; Sachs, Julian P.

Nelson, Daniel B. ; Sachs, Julian P. Less -
NOAA Program & Office:

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office)

OAR (Oceanic and Atmospheric Research) ; CPO (Climate Program Office) Less -
Description:

Tropical maritime precipitation affects global atmospheric circulation, influencing storm tracks and the size and location of subtropical deserts. Paleoclimate evidence suggests centuries-long changes in rainfall in the tropical Pacific over the past 2,000 y, but these remain poorly characterized across most of the ocean where long, continuous proxy records capable of resolving decadal-to-centennial climate changes are still virtually nonexistent despite substantial efforts to develop them. Here we apply a new climate proxy based on paired hydrogen isotope ratios from microalgal and mangrove-derived sedimentary lipids in the Galapagos to reconstruct maritime precipitation changes during the Common Era. We show that increased rainfall during the Little Ice Age (LIA) (similar to 1400-1850 CE) was likely caused by a southward migration of the Intertropical Convergence Zone (ITCZ), and that this shift occurred later than previously recognized, coeval with dynamically linked precipitation changes in South America and the western tropical Pacific. Before the LIA, we show that drier conditions at the onset of the Medieval Warm Period (similar to 800-1300 CE) and wetter conditions ca. 2 ka were caused by changes in the El Nino/Southern Oscillation (ENSO). Collectively, the large natural variations in tropical rainfall we detect, each linked to a multicentury perturbation of either ENSO-like variability or the ITCZ, imply a high sensitivity of tropical Pacific rainfall to climate forcings.
Keywords:

[+]

Climate D/h Fractionation Delta-d; Values ENSO Hydrogen Isotope Fractionation Hydrogen Isotopes Intertropical Convergence Zone Inverse Relationship ITCZ Lake Paleoclimate Salinity Science Stable Isotopes Technology
Source:

PNAS 113 (13) 3476-3481; https://doi.org/10.1073/pnas.1516271113
DOI:

https://doi.org/10.1073/pnas.1516271113
Pubmed ID:

26976574
Pubmed Central ID:

PMC4822634
Document Type:

Journal Article
Funding:

Grant no. NA08OAR4310685
Place as Subject:

Pacific Area ; Tropics

Pacific Area ; Tropics Less -
Rights Information:

Other
Compliance:

PMC
Main Document Checksum:

[+]

urn:sha256:20906930f9b7463a7c5ef2693fcffe9a134605ba6fc943c6c49d5fe08c986801
Download URL:

https://repository.library.noaa.gov/view/noaa/29247/noaa_29247_DS1.pdf
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Galápagos hydroclimate of the Common Era from paired microalgal and mangrove biomarker 2H/1H values

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