|
|
- Changes in productivity and intermediate circulation in the northern
Indian Ocean since the last deglaciation: new insights from benthic
foraminiferal Cd ∕ Ca records and benthic assemblage analyses
Abstract: Changes in productivity and intermediate circulation in the northern Indian Ocean since the last deglaciation: new insights from benthic foraminiferal Cd ∕ Ca records and benthic assemblage analyses
Ruifang Ma, Sophie Sépulcre, Laetitia Licari, Frédéric Haurine, Franck Bassinot, Zhaojie Yu, and Christophe Colin
Clim. Past, 18, 1757–1774, https://doi.org/10.5194/cp-18-1757-2022, 2022
We provide high-resolution Cd / Ca records of benthic foraminifera on two cores from the northern Indian Ocean since the last deglaciation. We reconstructed intermediate Cdw records based on Cd / Ca. Combined with benthic foraminiferal assemblages, we show that intermediate Cdw during the last deglaciation was mainly influenced by the ventilation of intermediate–bottom water masses. Thereafter during the Holocene surface productivity is the main forcing factor related to monsoon precipitation.
PubDate: Wed, 03 Aug 2022 16:51:51 +020
DOI: 10.5194/cp-18-1757-2022 2022
- Extreme historical droughts and floods in the Hanjiang River Basin, China,
since 1426
Abstract: Extreme historical droughts and floods in the Hanjiang River Basin, China, since 1426
Xiaodan Zhang, Guoyu Ren, Yuda Yang, He Bing, Zhixin Hao, and Panfeng Zhang
Clim. Past, 18, 1775–1796, https://doi.org/10.5194/cp-18-1775-2022, 2022
Applying yearly drought and flood records from historical documents and precipitation data in the period of instrumental measurements, this study constructs a time series of extreme droughts and floods in the Hanjiang River Basin from 1426–2017 and analyzes the temporal and spatial characteristics of the extreme drought and flood event variations.
PubDate: Wed, 03 Aug 2022 16:51:51 +020
DOI: 10.5194/cp-18-1775-2022 2022
- Antarctic sea ice over the past 130 000 years – Part 1: a review of
what proxy records tell us
Abstract: Antarctic sea ice over the past 130 000 years – Part 1: a review of what proxy records tell us
Xavier Crosta, Karen E. Kohfeld, Helen C. Bostock, Matthew Chadwick, Alice Du Vivier, Oliver Esper, Johan Etourneau, Jacob Jones, Amy Leventer, Juliane Müller, Rachael H. Rhodes, Claire S. Allen, Pooja Ghadi, Nele Lamping, Carina B. Lange, Kelly-Anne Lawler, David Lund, Alice Marzocchi, Katrin J. Meissner, Laurie Menviel, Abhilash Nair, Molly Patterson, Jennifer Pike, Joseph G. Prebble, Christina Riesselman, Henrik Sadatzki, Louise C. Sime, Sunil K. Shukla, Lena Thöle, Maria-Elena Vorrath, Wenshen Xiao, and Jiao Yang
Clim. Past, 18, 1729–1756, https://doi.org/10.5194/cp-18-1729-2022, 2022
Despite its importance in the global climate, our knowledge of Antarctic sea-ice changes throughout the last glacial–interglacial cycle is extremely limited. As part of the Cycles of Sea Ice Dynamics in the Earth system (C-SIDE) Working Group, we review marine- and ice-core-based sea-ice proxies to provide insights into their applicability and limitations. By compiling published records, we provide information on Antarctic sea-ice dynamics over the past 130 000 years.
PubDate: Tue, 02 Aug 2022 16:51:51 +020
DOI: 10.5194/cp-18-1729-2022 2022
- Climate changes during the Lateglacial in South Europe: new insights based
on pollen and brGDGTs of Lake Matese in Italy
Abstract: Climate changes during the Lateglacial in South Europe: new insights based on pollen and brGDGTs of Lake Matese in Italy
Mary Robles, Odile Peyron, Guillemette Ménot, Elisabetta Brugiapaglia, Sabine Wulf, Oona Appelt, Marion Blache, Boris Vannière, Lucas Dugerdil, Bruno Paura, Salomé Ansanay-Alex, Amy Cromartie, Laurent Charlet, Stephane Guédron, Jacques-Louis de Beaulieu, and Sébastien Joannin
Clim. Past Discuss., https//doi.org/10.5194/cp-2022-54,2022
Preprint under review for CP (discussion: open, 0 comments)
Quantitative climate reconstructions based on pollen and brGDGTs reveal, for the Lateglacial, a warm Bølling–Allerød and a marked cold Younger Dryas in Italy, showing no latitudinal differences in terms of temperatures across Italy. In terms of precipitation, no latitudinal differences are recorded during the Bølling–Allerød whereas the latitudes 40–42° N appear as a key junction point between wetter conditions in Southern Italy and drier conditions in Northern Italy during the Younger Dryas.
PubDate: Thu, 28 Jul 2022 16:07:21 +020
DOI: 10.5194/cp-2022-542022
- Regional validation of the use of diatoms in ice cores from the Antarctic
Peninsula as a Southern Hemisphere westerly wind proxy
Abstract: Regional validation of the use of diatoms in ice cores from the Antarctic Peninsula as a Southern Hemisphere westerly wind proxy
Dieter R. Tetzner, Elizabeth R. Thomas, Claire S. Allen, and Mackenzie M. Grieman
Clim. Past, 18, 1709–1727, https://doi.org/10.5194/cp-18-1709-2022, 2022
Changes in the Southern Hemisphere westerly winds are drivers of recent environmental changes in West Antarctica. However, our understanding of this relationship is limited by short and sparse observational records. Here we present the first regional wind study based on the novel use of diatoms preserved in Antarctic ice cores. Our results demonstrate that diatom abundance is the optimal record for reconstructing wind strength variability over the Southern Hemisphere westerly wind belt.
PubDate: Thu, 21 Jul 2022 10:48:34 +020
DOI: 10.5194/cp-18-1709-2022 2022
- Subdaily meteorological measurements of temperature, direction of the
movement of the clouds, and cloud cover in the Late Maunder Minimum by
Louis Morin in Paris
Abstract: Subdaily meteorological measurements of temperature, direction of the movement of the clouds, and cloud cover in the Late Maunder Minimum by Louis Morin in Paris
Thomas Pliemon, Ulrich Foelsche, Christian Rohr, and Christian Pfister
Clim. Past, 18, 1685–1707, https://doi.org/10.5194/cp-18-1685-2022, 2022
We have digitized and analyzed meteorological variables (temperature, direction of the movement of the clouds, and cloud cover), which were noted by Louis Morin in the period 1665–1713 in Paris. This time period is characterized by cold winters and autumns and moderate springs and summers. A low frequency of westerlies in the winter months leads to a cooling. Morin's measurements seem to be trustworthy. Only cloud cover in quantitative terms should be taken with caution.
PubDate: Thu, 21 Jul 2022 10:48:34 +020
DOI: 10.5194/cp-18-1685-2022 2022
- Greenhouse gases modulate the strength of millennial-scale subtropical
rainfall, consistent with future predictions
Abstract: Greenhouse gases modulate the strength of millennial-scale subtropical rainfall, consistent with future predictions
Fei Guo, Steven Clemens, Yuming Liu, Ting Wang, Huimin Fan, Xingxing Liu, and Youbin Sun
Clim. Past, 18, 1675–1684, https://doi.org/10.5194/cp-18-1675-2022, 2022
Our high-resolution loess Ca/Ti record displays millennial monsoon oscillations that persist over the last 650 kyr. Wavelet results indicate the ice volume and GHG co-modulation at the 100 kyr band and GHG and local insolation forcing at the precession band for the magnitude of millennial monsoon variability of loess Ca/Ti. The inferred mechanism calls on dynamic linkages to variability in AMOC. At the precession band, combined effects of GHG and insolation lead to increased extreme rainfall.
PubDate: Wed, 20 Jul 2022 10:48:34 +020
DOI: 10.5194/cp-18-1675-2022 2022
- Seasonal aridity in the Indo-Pacific Warm Pool during the Late Glacial
driven by El Niño-like conditions
Abstract: Seasonal aridity in the Indo-Pacific Warm Pool during the Late Glacial driven by El Niño-like conditions
Petter L. Hällberg, Frederik Schenk, Kweku A. Yamoah, Xueyuen Kuang, and Rienk H. Smittenberg
Clim. Past, 18, 1655–1674, https://doi.org/10.5194/cp-18-1655-2022, 2022
Using climate model simulations, we find that SE Asian tropical climate was strongly seasonal under Late Glacial conditions. During Northern Hemisphere winters, it was highly arid in this region that is today humid year-round. The seasonal aridity was driven by orbital forcing and stronger East Asian winter monsoon. A breakdown of deep convection caused a reorganized Walker Circulation and a mean state resembling El Niño conditions.
PubDate: Mon, 18 Jul 2022 18:08:07 +020
DOI: 10.5194/cp-18-1655-2022 2022
- Investigating stable oxygen and carbon isotopic variability in speleothem
records over the last millennium using multiple isotope-enabled climate
models
Abstract: Investigating stable oxygen and carbon isotopic variability in speleothem records over the last millennium using multiple isotope-enabled climate models
Janica C. Bühler, Josefine Axelsson, Franziska A. Lechleitner, Jens Fohlmeister, Allegra N. LeGrande, Madhavan Midhun, Jesper Sjolte, Martin Werner, Kei Yoshimura, and Kira Rehfeld
Clim. Past, 18, 1625–1654, https://doi.org/10.5194/cp-18-1625-2022, 2022
We collected and standardized the output of five isotope-enabled simulations for the last millennium and assess differences and similarities to records from a global speleothem database. Modeled isotope variations mostly arise from temperature differences. While lower-resolution speleothems do not capture extreme changes to the extent of models, they show higher variability on multi-decadal timescales. As no model excels in all comparisons, we advise a multi-model approach where possible.
PubDate: Wed, 13 Jul 2022 18:08:07 +020
DOI: 10.5194/cp-18-1625-2022 2022
- Was there a volcanic-induced long-lasting cooling over the Northern
Hemisphere in the mid-6th–7th century'
Abstract: Was there a volcanic-induced long-lasting cooling over the Northern Hemisphere in the mid-6th–7th century'
Evelien van Dijk, Johann Jungclaus, Stephan Lorenz, Claudia Timmreck, and Kirstin Krüger
Clim. Past, 18, 1601–1623, https://doi.org/10.5194/cp-18-1601-2022, 2022
A double volcanic eruption in 536 and 540 CE caused one of the coldest decades during the last 2000 years. We analyzed new climate model simulations from that period and found a cooling of up to 2°C and a sea-ice extent up to 200 km further south. Complex interactions between sea ice and ocean circulation lead to a reduction in the northward ocean heat transport, which makes the sea ice extend further south; this in turn leads to a surface cooling up to 20 years after the eruptions.
PubDate: Tue, 12 Jul 2022 22:59:23 +020
DOI: 10.5194/cp-18-1601-2022 2022
- The role of ice-sheet topography in the Alpine hydro-climate at glacial
times
Abstract: The role of ice-sheet topography in the Alpine hydro-climate at glacial times
Patricio Velasquez, Martina Messmer, and Christoph C. Raible
Clim. Past, 18, 1579–1600, https://doi.org/10.5194/cp-18-1579-2022, 2022
We investigate the sensitivity of the glacial Alpine hydro-climate to northern hemispheric and local ice-sheet changes. We perform sensitivity simulations of up to 2 km horizontal resolution over the Alps for glacial periods. The findings demonstrate that northern hemispheric and local ice-sheet topography are important role in regulating the Alpine hydro-climate and permits a better understanding of the Alpine precipitation patterns at glacial times.
PubDate: Mon, 11 Jul 2022 22:59:23 +020
DOI: 10.5194/cp-18-1579-2022 2022
- Stratigraphic templates for ice core records of the past 1.5 Myr
Abstract: Stratigraphic templates for ice core records of the past 1.5 Myr
Eric W. Wolff, Hubertus Fischer, Tas van Ommen, and David A. Hodell
Clim. Past, 18, 1563–1577, https://doi.org/10.5194/cp-18-1563-2022, 2022
Projects are underway to drill ice cores in Antarctica reaching 1.5 Myr back in time. Dating such cores will be challenging. One method is to match records from the new core against datasets from existing marine sediment cores. Here we explore the options for doing this and assess how well the ice and marine records match over the existing 800 000-year time period. We are able to recommend a strategy for using marine data to place an age scale on the new ice cores.
PubDate: Thu, 07 Jul 2022 22:59:23 +020
DOI: 10.5194/cp-18-1563-2022 2022
- On the economic impact of droughts in central Europe: the decade from 1531
to 1540 from the Polish perspective
Abstract: On the economic impact of droughts in central Europe: the decade from 1531 to 1540 from the Polish perspective
Tomasz Związek, Piotr Guzowski, Radosław Poniat, Maciej T. Radomski, Monika Kozłowska-Szyc, Tomasz Panecki, Sandra Słowińska, Bogusława Kruczkowska, Michał Targowski, and Dagmara Adamska
Clim. Past, 18, 1541–1561, https://doi.org/10.5194/cp-18-1541-2022, 2022
We wanted to take an in-depth look at how climate events affected the economy of early modern Poland. We focused on analysing all available sources of a fiscal nature for this period. In addition, we analysed available materials on the export of primary agricultural products. Our results have shown that the economic system in Poland at that time coped effectively with periodic droughts, and it was only the great drought of 1540 that significantly shook the state's economy.
PubDate: Tue, 05 Jul 2022 17:46:50 +020
DOI: 10.5194/cp-18-1541-2022 2022
- Development of longitudinal dunes under Pangaean atmospheric circulation
Abstract: Development of longitudinal dunes under Pangaean atmospheric circulation
Hiroki Shozaki and Hitoshi Hasegawa
Clim. Past, 18, 1529–1539, https://doi.org/10.5194/cp-18-1529-2022, 2022
Atmospheric circulation in the supercontinent of Pangaea is thought to have been significantly different from today. We present the spatial distribution of palaeowind directions recorded in Lower Jurassic aeolian sandstones in the western US. This reveals the development of longitudinal dunes formed by a combination of westerly, northwesterly, and northeasterly palaeowinds. The reconstructed palaeowind pattern at ~19–27°N is consistent with the model-generated surface wind pattern in Pangaea.
PubDate: Tue, 05 Jul 2022 17:46:50 +020
DOI: 10.5194/cp-18-1529-2022 2022
- Influence of long-term changes in solar irradiance forcing on the Southern
Annular Mode
Abstract: Influence of long-term changes in solar irradiance forcing on the Southern Annular Mode
Nicky M. Wright, Claire E. Krause, Steven J. Phipps, Ghyslaine Boschat, and Nerilie J. Abram
Clim. Past, 18, 1509–1528, https://doi.org/10.5194/cp-18-1509-2022, 2022
The Southern Annular Mode (SAM) is a major mode of climate variability. Proxy-based SAM reconstructions show changes that last millennium climate simulations do not reproduce. We test the SAM's sensitivity to solar forcing using simulations with a range of solar values and transient last millennium simulations with large-amplitude solar variations. We find that solar forcing can alter the SAM and that strong solar forcing transient simulations better match proxy-based reconstructions.
PubDate: Fri, 01 Jul 2022 15:43:36 +020
DOI: 10.5194/cp-18-1509-2022 2022
- The 852/3 CE Mount Churchill eruption: examining the potential climatic
and societal impacts and the timing of the Medieval Climate Anomaly in the
North Atlantic region
Abstract: The 852/3 CE Mount Churchill eruption: examining the potential climatic and societal impacts and the timing of the Medieval Climate Anomaly in the North Atlantic region
Helen Mackay, Gill Plunkett, Britta J. L. Jensen, Thomas J. Aubry, Christophe Corona, Woon Mi Kim, Matthew Toohey, Michael Sigl, Markus Stoffel, Kevin J. Anchukaitis, Christoph Raible, Matthew S. M. Bolton, Joseph G. Manning, Timothy P. Newfield, Nicola Di Cosmo, Francis Ludlow, Conor Kostick, Zhen Yang, Lisa Coyle McClung, Matthew Amesbury, Alistair Monteath, Paul D. M. Hughes, Pete G. Langdon, Dan Charman, Robert Booth, Kimberley L. Davies, Antony Blundell, and Graeme T. Swindles
Clim. Past, 18, 1475–1508, https://doi.org/10.5194/cp-18-1475-2022, 2022
We assess the climatic and societal impact of the 852/3 CE Alaska Mount Churchill eruption using environmental reconstructions, historical records and climate simulations. The eruption is associated with significant Northern Hemisphere summer cooling, despite having only a moderate sulfate-based climate forcing potential; however, evidence of a widespread societal response is lacking. We discuss the difficulties of confirming volcanic impacts of a single eruption even when it is precisely dated.
PubDate: Wed, 29 Jun 2022 15:43:36 +020
DOI: 10.5194/cp-18-1475-2022 2022
- Impact of iron fertilisation on atmospheric CO2 during the last glaciation
Abstract: Impact of iron fertilisation on atmospheric CO2 during the last glaciation
Himadri Saini, Katrin J. Meissner, Laurie Menviel, and Karin Kvale
Clim. Past Discuss., https//doi.org/10.5194/cp-2022-46,2022
Preprint under review for CP (discussion: open, 0 comments)
Understanding the variability in atmospheric CO2 during the past glacial cycle is crucial to understand the future impact of climate change. Previous research has hypothesised a key role of higher iron input into the Southern Ocean in influencing the global atmospheric CO2 levels by impacting the changes in the marine phytoplankton response. In this study we test this hypothesis using climate modelling and constraint the impact of ocean iron influence on global CO2 decrease.
PubDate: Tue, 28 Jun 2022 15:43:36 +020
DOI: 10.5194/cp-2022-462022
- A 334-year coral record of surface temperature and salinity variability in
the greater Agulhas Current region
Abstract: A 334-year coral record of surface temperature and salinity variability in the greater Agulhas Current region
Jens Zinke, Takaaki K. Watanabe, Siren Rühs, Miriam Pfeiffer, Stefan Grab, Dieter Garbe-Schönberg, and Arne Biastoch
Clim. Past, 18, 1453–1474, https://doi.org/10.5194/cp-18-1453-2022, 2022
Salinity is an important and integrative measure of changes to the water cycle steered by changes to the balance between rainfall and evaporation and by vertical and horizontal movements of water parcels by ocean currents. However, salinity measurements in our oceans are extremely sparse. To fill this gap, we have developed a 334-year coral record of seawater oxygen isotopes that reflects salinity changes in the globally important Agulhas Current system and reveals its main oceanic drivers.
PubDate: Mon, 27 Jun 2022 15:43:36 +020
DOI: 10.5194/cp-18-1453-2022 2022
- Impact of terrestrial biosphere on the atmospheric CO2 concentration
across Termination V
Abstract: Impact of terrestrial biosphere on the atmospheric CO2 concentration across Termination V
Gabriel Hes, María F. Sánchez Goñi, and Nathaelle Bouttes
Clim. Past, 18, 1429–1451, https://doi.org/10.5194/cp-18-1429-2022, 2022
Termination V (TV, ~ 404–433 kyr BP) marks a transition in the climate system towards amplified glacial–interglacial cycles. While the associated atmospheric CO2 changes are mostly attributed to the Southern Ocean, little is known about the terrestrial biosphere contribution to the carbon cycle. This study provides the first (model- and pollen-based) reconstruction of global forests highlighting the potential role of temperate and boreal forests in atmospheric CO2 sequestration during TV.
PubDate: Mon, 27 Jun 2022 15:43:36 +020
DOI: 10.5194/cp-18-1429-2022 2022
- A global inventory of quantitative documentary evidence related to climate
since the 15th century
Abstract: A global inventory of quantitative documentary evidence related to climate since the 15th century
Angela-Maria Burgdorf
Clim. Past, 18, 1407–1428, https://doi.org/10.5194/cp-18-1407-2022, 2022
This comprehensive inventory of quantitative documentary evidence related to climate extending back to 1400 CE promotes the first ever global perspective on documentary climate records. It lays the foundation for incorporating documentary evidence from archives of societies into global-scale climate reconstructions, complementing (early) instrumental measurements and natural climate proxies. Documentary records are particularly relevant in seasons and regions poorly covered by natural proxies.
PubDate: Fri, 24 Jun 2022 19:54:41 +020
DOI: 10.5194/cp-18-1407-2022 2022
|
Open Access journal
