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The global monsoon across timescales: coherent variability of regional monsoons

It remains a debated issue as to what extent and at which timescales the global monsoon can be viewed as a major mode of climate variability. For this purpose, a PAGES (Past Global Changes) working group (WG) was set up to investigate the concept of the global monsoon and its future research directions. The WG’s synthesis is presented here.

Numerical studies on the Impact of the Last Glacial Cycle on recent borehole temperature profiles: implications for terrestrial energy balance

In this paper, the authors provide the first estimate of the impact of the development of the Laurentide ice sheet on the estimates of energy and temperature reconstructions from measurements of terrestrial borehole temperatures in North America.

Late Pliocene and Early Pleistocene vegetation history of northeastern Russian Arctic inferred from the Lake El’gygytgyn pollen record

The 318 m thick lacustrine sediment record from Lake El’gygytgyn, northeastern Russian Arctic cored by the international El’gygytgyn Drilling Project provides unique opportunities for the time-continuous reconstruction of the regional paleoenvironmental history for the past 3.6 Myr. This is analysed here.

Modelling global-scale climate impacts of the late Miocene Messinian Salinity Crisis

By running extreme, sensitivity-type experiments with a fully coupled ocean–atmosphere general circulation model, this paper investigates the potential of various Messinian Salinity Crisis Mediterranean Outflow Water scenarios to impact global-scale climate.

The challenge of simulating the warmth of the mid-Miocene climatic optimum in CESM1

In this paper, the authors use the recently released Community Earth System Model (CESM1.0) with a slab ocean to simulate the mid-Miocene climatic optimum, incorporating recent Miocene CO₂ reconstructions of 400 ppm (parts per million).

Using palaeo-climate comparisons to constrain future projections in CMIP5

We present a selection of methodologies for using the palaeo-climate model component of the Coupled Model Intercomparison Project (Phase 5) to attempt to constrain future climate projections using the same models.

Salinity changes in the Agulhas leakage area recorded by stable hydrogen isotopes of C₃₇ alkenones during Termination I and II

We reconstructed sea surface salinity changes using alkenone δD, and paleo-sea surface temperature using TEX^H₈₆ and U^K’₃₇, from two sediment cores located in the Agulhas leakage area during Termination I and II.

Peak glacial ¹⁴C ventilation ages suggest major draw-down of carbon into the abyssal ocean

Here we present a new, though still fragmentary, ocean-wide Δ¹⁴C data set showing that during the Last Glacial Maximum (LGM) and Heinrich Stadial 1 (HS-1) the maximum ¹⁴C age difference between ocean deep waters and the atmosphere exceeded the modern values by up to 1500 ¹⁴C yr, in the extreme reaching 5100 ¹⁴C yr.

Where to find 1.5 million yr old ice for the IPICS “Oldest-Ice” ice core

The recovery of a 1.5 million yr long ice core from Antarctica represents a keystone of our understanding of Quaternary climate, the progression of glaciation over this time period and the role of greenhouse gas cycles in this progression. Here we tackle the question of where such ice may still be found in the Antarctic ice sheet

IPICS “Oldest-Ice” ice core">Read more

North–south palaeohydrological contrasts in the central Mediterranean during the Holocene: tentative synthesis and working hypotheses

On the basis of a multi-proxy approach and a strategy combining lacustrine and marine records along a north–south transect, data collected in the central Mediterranean within the framework of a collaborative project have led to reconstruction of high-resolution and well-dated palaeohydrological records and to assessment of their spatial and temporal coherency.

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