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Article
Open AccessRecurring summer and winter droughts from 4.2-3.97 thousand years ago in north India
The 4.2-kiloyear event has been described as a global megadrought that transformed multiple Bronze Age complex societies, including the Indus Civilization, located in a sensitive transition zone with a bimodal...
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Article
Open AccessClay hydroxyl isotopes show an enhanced hydrologic cycle during the Paleocene-Eocene Thermal Maximum
The Paleocene-Eocene Thermal Maximum (PETM) was an abrupt global warming event associated with a large injection of carbon into the ocean-atmosphere system, as evidenced by a diagnostic carbon isotope excursio...
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Article
Open AccessDrought-Induced Civil Conflict Among the Ancient Maya
The influence of climate change on civil conflict and societal instability in the premodern world is a subject of much debate, in part because of the limited temporal or disciplinary scope of case studies. We ...
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Article
Persistent orbital influence on millennial climate variability through the Pleistocene
Abundant evidence from marine, ice-core and terrestrial records demonstrates that Earth’s climate has experienced co-evolution of orbital- and millennial-scale variability through the Pleistocene. The varying ...
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Article
Open AccessAuthor Correction: The potential of gypsum speleothems for paleoclimatology: application to the Iberian Roman Humid Period
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
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Article
Open AccessThe potential of gypsum speleothems for paleoclimatology: application to the Iberian Roman Humid Period
Carbonate cave deposits (speleothems) have been used widely for paleoclimate reconstructions; however, few studies have examined the utility of other speleothem-forming minerals for this purpose. Here we demon...
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Article
Open AccessFast and slow components of interstadial warming in the North Atlantic during the last glacial
The abrupt nature of warming events recorded in Greenland ice-cores during the last glacial has generated much debate over their underlying mechanisms. Here, we present joint marine and terrestrial analyses fr...
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Article
Open AccessTransient hydrodynamic effects influence organic carbon signatures in marine sediments
Ocean dynamics served an important role during past dramatic climate changes via impacts on deep-ocean carbon storage. Such changes are recorded in sedimentary proxies of hydrographic change on continental mar...
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Article
Open AccessAuthor Correction: Intensified summer monsoon and the urbanization of Indus Civilization in northwest India
A correction to this article has been published and is linked from the HTML and PDF versions of this paper. The error has not been fixed in the paper.
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Article
Open AccessIntensified summer monsoon and the urbanization of Indus Civilization in northwest India
Today the desert margins of northwest India are dry and unable to support large populations, but were densely occupied by the populations of the Indus Civilization during the middle to late Holocene. The hydro...
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Article
Open AccessNonlinear climatic sensitivity to greenhouse gases over past 4 glacial/interglacial cycles
The paleoclimatic sensitivity to atmospheric greenhouse gases (GHGs) has recently been suggested to be nonlinear, however a GHG threshold value associated with deglaciation remains uncertain. Here, we combine ...
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Article
West Antarctic Ice Sheet retreat driven by Holocene warm water incursions
Glaciological and oceanographic observations coupled with numerical models show that warm Circumpolar Deep Water (CDW) incursions onto the West Antarctic continental shelf cause melting of the undersides of fl...
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Article
Stable carbon isotopes (δ13C) of total organic carbon and long-chain n-alkanes as proxies for climate and environmental change in a sediment core from Lake Petén-Itzá, Guatemala
Sediment core PI-6 from Lake Petén Itzá, Guatemala, possesses an ~85-ka record of climate and environmental change from lowland Central America. Variations in sediment lithology suggest large and abrupt change...
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Article
Open AccessAtlantic Deep-water Response to the Early Pliocene Shoaling of the Central American Seaway
The early Pliocene shoaling of the Central American Seaway (CAS), ~4.7–4.2 million years ago (mega annum-Ma), is thought to have strengthened Atlantic Meridional Overturning Circulation (AMOC). The associated ...
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Article
Oxygen isotope analysis of multiple, single ostracod valves as a proxy for combined variability in seasonal temperature and lake water oxygen isotopes
Paleoclimate studies in lakes typically use oxygen isotopic ratios in samples that consist of multiple ostracod specimens, to obtain an average δ18O value that reflects the mean temperature and δ18O of lake water...
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Article
Open AccessCorrelating the Ancient Maya and Modern European Calendars with High-Precision AMS 14C Dating
The reasons for the development and collapse of Maya civilization remain controversial and historical events carved on stone monuments throughout this region provide a remarkable source of data about the rise ...
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Article
A Laurentide outburst flooding event during the last interglacial period
Episodes of ice sheet disintegration and meltwater release over glacial–interglacial cycles are recorded in the sediments of the Labrador Sea. Analyses of sediment cores along the Labrador and Greenland margin...
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Article
Middle to late Holocene initiation of the annual flood pulse in Tonle Sap Lake, Cambodia
Tonle Sap Lake, Cambodia, possesses one of the most productive inland fisheries in the world and is a vital natural resource for the country. The lake is connected to the Mekong River via the Tonle Sap River. ...
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Article
Isotope measurements of single ostracod valves and gastropod shells for climate reconstruction: evaluation of within-sample variability and determination of optimum sample size
Sediment cores from Lakes Punta Laguna, Chichancanab, and Petén Itzá on the Yucatan Peninsula were used to (1) investigate “within-horizon” stable isotope variability (δ18O and δ13C) measured on multiple, single ...
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Re-evaluation of Climate Change in Lowland Central America During the Last Glacial Maximum Using New Sediment Cores from Lake Petén Itzá, Guatemala
Glaciological data derived from moraines, and multiproxy data from lake sediment cores (e.g. fossil pollen, diatoms, and isotope data) indicate cooling in the Central American tropics during the last ice age. ...
