Jasper A. Wassenburg
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View article: Interglacial climate, wildfire, and vegetation dynamics in southeastern Siberia over the last 580,000 years
Interglacial climate, wildfire, and vegetation dynamics in southeastern Siberia over the last 580,000 years Open
Wildfires are a rapidly increasing threat to boreal forests. Our current understanding of the drivers behind wildfires and their environmental impact, while growing, is based mostly on data that is limited to the observational period. …
View article: Quantifying evaporation during fluid inclusion isotope analysis in speleothem samples
Quantifying evaporation during fluid inclusion isotope analysis in speleothem samples Open
Speleothem fluid inclusion isotope analysis provides the oxygen and hydrogen isotope compositions of the parent water from which the carbonate was precipitated. In contrast to the carbonate isotopes, it is not affected by kinetic isotope e…
View article: Triple oxygen isotope reveals insolation-forced tropical moisture cycles
Triple oxygen isotope reveals insolation-forced tropical moisture cycles Open
Tropical oceans are the main global water vapor and latent heat sources, but their responses to radiative forcing remain unclear. Here, we investigate oceanic moisture dynamics of the western tropical Pacific (WTP) over the past 210,000 ye…
View article: Trace element partitioning controls on cave drip water compositions through prior calcite and aragonite precipitation
Trace element partitioning controls on cave drip water compositions through prior calcite and aragonite precipitation Open
Speleothem trace element records can provide seasonal resolution climate reconstructions, but the interpretation can be challenging. Aragonite samples are understudied compared to calcite samples, despite that aragonite has 10x higher uran…
View article: Effects of prior calcite and prior aragonite precipitation on cave dripwater compositions
Effects of prior calcite and prior aragonite precipitation on cave dripwater compositions Open
Cave monitoring programs have provided a wealth of information on processes that affect speleothem proxy systems such as stable isotopes and trace elements. Prior carbonate precipitation (PCarbP), i.e. the precipitation of a carbonate mine…
View article: Korean precipitation isotopes reflect changes in the Western Pacific Subtropical High on interannual to millennial timescales
Korean precipitation isotopes reflect changes in the Western Pacific Subtropical High on interannual to millennial timescales Open
Strength and shifts of the Western Pacific Subtropical High (WPSH) have a strong influence on East Asian Summer Monsoon (EASM) precipitation. How the WPSH changed in the past and its forcing mechanisms on different timescales are yet to be…
View article: Orbital-scale Dynamics of the Eastern Asian Summer Monsoon
Orbital-scale Dynamics of the Eastern Asian Summer Monsoon Open
Due to multiple factors influencing orbital-scale variability of the East Asian Summer monsoon (EASM), the interpretation of speleothem-based climate reconstructions from this region has remained challenging. Using a 130,000-year accelerat…
View article: Variations in triple oxygen isotope of speleothems from the Asian monsoon region reveal moisture sources over the past 300 years
Variations in triple oxygen isotope of speleothems from the Asian monsoon region reveal moisture sources over the past 300 years Open
Characterization of moisture origins is crucial to understanding hydroclimatic processes. Nevertheless, documenting past atmospheric moisture contents and their sources remains challenging partially due to insufficient moisture-tracing pro…
View article: The spatiotemporal extent of the Green Sahara during the last glacial period
The spatiotemporal extent of the Green Sahara during the last glacial period Open
The Sahara Desert, one of today's most inhospitable environments, has known periods of enhanced precipitation that supported pre-historic humans. However, the Green Sahara timing and moisture sources are not well known due to limited paleo…
View article: Abrupt cooling event over Asia due to North Atlantic climate instability ~16 ka
Abrupt cooling event over Asia due to North Atlantic climate instability ~16 ka Open
The last glacial termination was marked by a series of millennial-scale hemispheric climate change events. One of the most prominent examples is Heinrich event  1, which was caused by ice-sheet instabilities of the Laurentide ice-shee…
View article: Improving calibrations of in-house water isotope standards using CRDS and OA-CRDS: memory effects versus drift
Improving calibrations of in-house water isotope standards using CRDS and OA-CRDS: memory effects versus drift Open
<p>The isotope composition of rainfall provides information on the initial isotope composition of the moisture source, conditions during evaporation and condensation of water vapor, and the rain-out history of an air-parcel. A standa…
View article: The “Hockey Stick” Imprint in Northwest African Speleothems
The “Hockey Stick” Imprint in Northwest African Speleothems Open
We present absolutely dated speleothem δ 18 O records spanning the past ∼1.5 kyr, which provide new evidence of the transmission of an anthropogenic signal to natural climatic archives in NW Africa. Combined with three other speleothem δ 1…
View article: Author Correction: Climate variations of Central Asia on orbital to millennial timescales
Author Correction: Climate variations of Central Asia on orbital to millennial timescales Open
An amendment to this paper has been published and can be accessed via a link at the top of the paper.
View article: A comparison of isotope ratio mass spectrometry and cavity ring‐down spectroscopy techniques for isotope analysis of fluid inclusion water
A comparison of isotope ratio mass spectrometry and cavity ring‐down spectroscopy techniques for isotope analysis of fluid inclusion water Open
Rationale Online oxygen ( δ 18 O) and hydrogen ( δ 2 H) isotope analysis of fluid inclusion water entrapped in minerals is widely applied in paleo‐fluid studies. In the state of the art of fluid inclusion isotope research, however, there i…
View article: High‐Resolution Proxy Records From Two Simultaneously Grown Stalagmites From Zoolithencave (Southeastern Germany) and their Potential for Palaeoclimate Reconstruction
High‐Resolution Proxy Records From Two Simultaneously Grown Stalagmites From Zoolithencave (Southeastern Germany) and their Potential for Palaeoclimate Reconstruction Open
Two small annually laminated stalagmites from Zoolithencave (southeastern Germany) grew between CE 1821 and 1970 (Zoo‐rez‐1) and CE 1835 and 1970 (Zoo‐rez‐2), respectively. Trace element concentrations were determined by Laser Ablation Ind…
View article: Green Sahara periods and climate-human interactions during the Last Glacial Period: Evidence from Northwest African speleothems
Green Sahara periods and climate-human interactions during the Last Glacial Period: Evidence from Northwest African speleothems Open
<p>North Africa is a key region to study the interactions between low-latitude African monsoon systems and high-latitude millennial-scale climate change. Here, we present new high&#8208;resolution &#948;<sup>18</sup&…
View article: How Far North Did the African Monsoon Fringe Expand During the African Humid Period? Insights From Southwest Moroccan Speleothems
How Far North Did the African Monsoon Fringe Expand During the African Humid Period? Insights From Southwest Moroccan Speleothems Open
We present new high‐resolution oxygen isotope (δ 18 O) records from three NW African speleothems located at ~31°N. The present‐day rainfall patterns at 31°N in NW Africa are linked to negative winter North Atlantic Oscillation phases. Howe…
View article: Calcite Mg and Sr partition coefficients in cave environments: implications for interpreting prior calcite precipitation in speleothems
Calcite Mg and Sr partition coefficients in cave environments: implications for interpreting prior calcite precipitation in speleothems Open
Trace element to Ca ratios in speleothems have emerged as important proxies that reflect local environmental conditions. However, interpretations of speleothem trace element records can be challenging due to various processes. Positive cor…
View article: Western Mediterranean Climate Response to Dansgaard/Oeschger Events: New Insights From Speleothem Records
Western Mediterranean Climate Response to Dansgaard/Oeschger Events: New Insights From Speleothem Records Open
The climate of the western Mediterranean was characterized by a strong precipitation gradient during the Holocene driven by atmospheric circulation patterns. The scarcity of terrestrial paleoclimate archives has precluded exploring this hy…
View article: Nano‐Powdered Calcium Carbonate Reference Materials: Significant Progress for Microanalysis?
Nano‐Powdered Calcium Carbonate Reference Materials: Significant Progress for Microanalysis? Open
Homogeneity, mass fractions of about forty trace elements and Sr isotope composition of Ca carbonate reference materials (RMs) between original and nano‐powdered pellets are compared. Our results using nanosecond and femtosecond LA‐(MC)‐IC…
View article: North Atlantic Ice‐Rafting, Ocean and Atmospheric Circulation During the Holocene: Insights From Western Mediterranean Speleothems
North Atlantic Ice‐Rafting, Ocean and Atmospheric Circulation During the Holocene: Insights From Western Mediterranean Speleothems Open
In this study, we present a Holocene rainfall index based on three high‐resolution speleothem records from the Western Mediterranean, a region under the influence of the westerly winds belt modulated by the North Atlantic Oscillation (NAO)…