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- An Intertropical Convergence Zone shift controlled the terrestrial
material supply on the Ninetyeast Ridge
Abstract: An Intertropical Convergence Zone shift controlled the terrestrial material supply on the Ninetyeast Ridge
Xudong Xu, Jianguo Liu, Yun Huang, Lanlan Zhang, Liang Yi, Shengfa Liu, Yiping Yang, Li Cao, and Long Tan
Clim. Past, 18, 1369–1384, https://doi.org/10.5194/cp-18-1369-2022, 2022
Terrestrial materials in marine environments record source information and help us understand how climate and ocean impact sediment compositions. Here, we use evidence on the Ninetyeast Ridge to analyze the relationship between terrestrial material supplementation and climatic change. We find that the ITCZ controlled the rainfall in the Burman source area and that closer connections occurred between the Northern–Southern Hemisphere in the eastern Indian Ocean during the late LGM.
PubDate: Wed, 22 Jun 2022 23:28:59 +020
DOI: 10.5194/cp-18-1369-2022 2022
- Improving temperature reconstructions from ice-core water-isotope records
Abstract: Improving temperature reconstructions from ice-core water-isotope records
Bradley R. Markle and Eric J. Steig
Clim. Past, 18, 1321–1368, https://doi.org/10.5194/cp-18-1321-2022, 2022
The geochemistry preserved in polar ice can provide detailed histories of Earth’s climate over millennia. Here we use the stable isotope ratios of ice from many Antarctic ice cores to reconstruct temperature variability of Antarctica and the midlatitude Southern Hemisphere over tens of thousands of years. We improve upon existing methods to estimate temperature from the geochemical measurements and investigate the patterns of climate change in the past.
PubDate: Tue, 21 Jun 2022 23:28:59 +020
DOI: 10.5194/cp-18-1321-2022 2022
- Causes of the weak emergent constraint on climate sensitivity at the Last
Glacial Maximum
Abstract: Causes of the weak emergent constraint on climate sensitivity at the Last Glacial Maximum
Martin Renoult, Navjit Sagoo, Jiang Zhu, and Thorsten Mauritsen
Clim. Past Discuss., https//doi.org/10.5194/cp-2022-52,2022
Preprint under review for CP (discussion: open, 0 comments)
The relationship between Last Glacial Maximum and the sensitivity of climate models to a doubling of CO2 can be used to estimate the true sensitivity of the Earth. However, this relationship has varied in successive model generations. In this study, we assess multiple processes at the Last Glacial Maximum which weaken this relationship. For example, how models respond to the presence of ice sheets is a large contributor of uncertainty.
PubDate: Tue, 21 Jun 2022 23:28:59 +020
DOI: 10.5194/cp-2022-522022
- Late Paleocene CO2 drawdown, climatic cooling and terrestrial denudation
in the southwest Pacific
Abstract: Late Paleocene CO2 drawdown, climatic cooling and terrestrial denudation in the southwest Pacific
Christopher J. Hollis, Sebastian Naeher, Christopher D. Clowes, B. David A. Naafs, Richard D. Pancost, Kyle W. R. Taylor, Jenny Dahl, Xun Li, G. Todd Ventura, and Richard Sykes
Clim. Past, 18, 1295–1320, https://doi.org/10.5194/cp-18-1295-2022, 2022
Previous studies of Paleogene greenhouse climates identified short-lived global warming events, termed hyperthermals, that provide insights into global warming scenarios. Within the same time period, we have identified a short-lived cooling event in the late Paleocene, which we term a hypothermal, that has potential to provide novel insights into the feedback mechanisms at work in a greenhouse climate.
PubDate: Mon, 20 Jun 2022 23:28:59 +020
DOI: 10.5194/cp-18-1295-2022 2022
- Comprehensive uncertainty estimation of the timing of Greenland warmings
in the Greenland ice core records
Abstract: Comprehensive uncertainty estimation of the timing of Greenland warmings in the Greenland ice core records
Eirik Myrvoll-Nilsen, Keno Riechers, Martin Wibe Rypdal, and Niklas Boers
Clim. Past, 18, 1275–1294, https://doi.org/10.5194/cp-18-1275-2022, 2022
In layer counted proxy records each measurement is accompanied by a timestamp typically measured by counting periodic layers. Knowledge of the uncertainty of this timestamp is important for a rigorous propagation to further analyses. By assuming a Bayesian regression model to the layer increments we express the dating uncertainty by the posterior distribution, from which chronologies can be sampled efficiently. We apply our framework to dating abrupt warming transitions during the last glacial.
PubDate: Mon, 20 Jun 2022 23:28:59 +020
DOI: 10.5194/cp-18-1275-2022 2022
- Abrupt climate change and millennial-scale cycles: an astronomical
mechanism
Abstract: Abrupt climate change and millennial-scale cycles: an astronomical mechanism
Alison Kelsey
Clim. Past Discuss., https//doi.org/10.5194/cp-2022-49,2022
Preprint under review for CP (discussion: open, 0 comments)
Although the physics of abrupt climate change is poorly understood, solar and lunar roles were suggested as causal to millennial-scale climate change. This paper provides statistically-significant results, highlighting the previously, unknown major role played by the Moon in forcing concurrent, millennial-scale, cyclical fluctuation of total solar irradiance, insolation, and gravitation due its influence on Earth-Sun distance that is strongest when Earth is at perihelion.
PubDate: Thu, 16 Jun 2022 13:29:02 +020
DOI: 10.5194/cp-2022-492022
- Meteorological and climatological triggers of past and present bark beetle
outbreaks in the Czech Republic
Abstract: Meteorological and climatological triggers of past and present bark beetle outbreaks in the Czech Republic
Rudolf Brázdil, Petr Zahradník, Péter Szabó, Kateřina Chromá, Petr Dobrovolný, Lukáš Dolák, Miroslav Trnka, Jan Řehoř, and Silvie Suchánková
Clim. Past Discuss., https//doi.org/10.5194/cp-2022-50,2022
Preprint under review for CP (discussion: open, 0 comments)
Bark beetle outbreaks represent important disturbances to Norway spruce forests. Their meteorological and climatological triggers are analysed for the main oubreaks over the territory of the Czech Republic based on newly created series of such outbreaks, covering the long period from the 18th to 21st century. The paper demonstrates the shift from windstorms as the main meteorological triggers of past outbreaks to those triggered dominantly by high temperatures and droughts in past decades.
PubDate: Mon, 13 Jun 2022 13:29:02 +020
DOI: 10.5194/cp-2022-502022
- Holocene wildfire regimes in western Siberia: interaction between peatland
moisture conditions and the composition of plant functional types
Abstract: Holocene wildfire regimes in western Siberia: interaction between peatland moisture conditions and the composition of plant functional types
Angelica Feurdean, Andrei-Cosmin Diaconu, Mirjam Pfeiffer, Mariusz Gałka, Simon M. Hutchinson, Geanina Butiseaca, Natalia Gorina, Spassimir Tonkov, Aidin Niamir, Ioan Tantau, Hui Zhang, and Sergey Kirpotin
Clim. Past, 18, 1255–1274, https://doi.org/10.5194/cp-18-1255-2022, 2022
We used palaeoecological records from peatlands in southern Siberia. We showed that warmer climate conditions have lowered the water level and increased the fuel amount and flammability, consequently also increasing the frequency and severity of fires as well as the composition of tree types.
PubDate: Fri, 03 Jun 2022 18:38:18 +020
DOI: 10.5194/cp-18-1255-2022 2022
- Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current
dynamics (Indian Ocean) derived from oxygen and clumped-isotope
paleothermometry
Abstract: Plio-Pleistocene Perth Basin water temperatures and Leeuwin Current dynamics (Indian Ocean) derived from oxygen and clumped-isotope paleothermometry
David De Vleeschouwer, Marion Peral, Marta Marchegiano, Angelina Füllberg, Niklas Meinicke, Heiko Pälike, Gerald Auer, Benjamin Petrick, Christophe Snoeck, Steven Goderis, and Philippe Claeys
Clim. Past, 18, 1231–1253, https://doi.org/10.5194/cp-18-1231-2022, 2022
The Leeuwin Current transports warm water along the western coast of Australia: from the tropics to the Southern Hemisphere midlatitudes. Therewith, the current influences climate in two ways: first, as a moisture source for precipitation in southwestern Australia; second, as a vehicle for Equator-to-pole heat transport. In this study, we study sediment cores along the Leeuwin Current pathway to understand its ocean–climate interactions between 4 and 2 Ma.
PubDate: Wed, 01 Jun 2022 18:28:34 +020
DOI: 10.5194/cp-18-1231-2022 2022
- Sclerochronological evidence of pronounced seasonality from the late
Pliocene of the southern North Sea basin and its implications
Abstract: Sclerochronological evidence of pronounced seasonality from the late Pliocene of the southern North Sea basin and its implications
Andrew L. A. Johnson, Annemarie M. Valentine, Bernd R. Schöne, Melanie J. Leng, and Stijn Goolaerts
Clim. Past, 18, 1203–1229, https://doi.org/10.5194/cp-18-1203-2022, 2022
Determining seasonal temperatures demands proxies that record the highest and lowest temperatures over the annual cycle. Many record neither, but oxygen isotope profiles from shells in principle record both. Oxygen isotope data from late Pliocene bivalve molluscs of the southern North Sea basin show that the seasonal temperature range was at times much higher than previously estimated and higher than now. This suggests reduced oceanic heat supply, in contrast to some previous interpretations.
PubDate: Mon, 30 May 2022 18:28:34 +020
DOI: 10.5194/cp-18-1203-2022 2022
- 1750 years of hydrological change in southern Australia: a bivalve oxygen
isotope record from the Coorong Lagoon
Abstract: 1750 years of hydrological change in southern Australia: a bivalve oxygen isotope record from the Coorong Lagoon
Briony Kate Chamberlayne, Jonathan James Tyler, Deborah Haynes, Yuexiao Shao, John Tibby, and Bronwyn May Gillanders
Clim. Past Discuss., https//doi.org/10.5194/cp-2022-39,2022
Preprint under review for CP (discussion: open, 0 comments)
We used geochemical signals in shells preserved in sediments to create a 1750-year record of hydrological change in the Coorong Lagoon of South Australia. The record is interpreted to reflect the balance of evaporation and precipitation and shows that it has always been a highly evaporated system. The record also shows similarities to other environmental reconstructions from the region. This knowledge can increase our understanding of the potential impacts of environmental change.
PubDate: Mon, 30 May 2022 18:28:34 +020
DOI: 10.5194/cp-2022-392022
- Reconstructing burnt area during the Holocene: an Iberian case study
Abstract: Reconstructing burnt area during the Holocene: an Iberian case study
Yicheng Shen, Luke Sweeney, Mengmeng Liu, Jose Antonio Lopez Saez, Sebastián Pérez-Díaz, Reyes Luelmo-Lautenschlaeger, Graciela Gil-Romera, Dana Hoefer, Gonzalo Jiménez-Moreno, Heike Schneider, I. Colin Prentice, and Sandy P. Harrison
Clim. Past, 18, 1189–1201, https://doi.org/10.5194/cp-18-1189-2022, 2022
We present a method to reconstruct burnt area using a relationship between pollen and charcoal abundances and the calibration of charcoal abundance using modern observations of burnt area. We use this method to reconstruct changes in burnt area over the past 12 000 years from sites in Iberia. We show that regional changes in burnt area reflect known changes in climate, with a high burnt area during warming intervals and low burnt area when the climate was cooler and/or wetter than today.
PubDate: Wed, 25 May 2022 22:22:02 +020
DOI: 10.5194/cp-18-1189-2022 2022
- A multi-ice-core, annual-layer-counted Greenland ice-core chronology for
the last 3800 years: GICC21
Abstract: A multi-ice-core, annual-layer-counted Greenland ice-core chronology for the last 3800 years: GICC21
Giulia Sinnl, Mai Winstrup, Tobias Erhardt, Eliza Cook, Camilla Marie Jensen, Anders Svensson, Bo Møllesøe Vinther, Raimund Muscheler, and Sune Olander Rasmussen
Clim. Past, 18, 1125–1150, https://doi.org/10.5194/cp-18-1125-2022, 2022
A new Greenland ice-core timescale, covering the last 3800 years, was produced using the machine learning algorithm StratiCounter. We synchronized the ice cores using volcanic eruptions and wildfires. We compared the new timescale to the tree-ring timescale, finding good alignment both between the common signatures of volcanic eruptions and of solar activity. Our Greenlandic timescales is safe to use for the Late Holocene, provided one uses our uncertainty estimate.
PubDate: Tue, 24 May 2022 22:22:02 +020
DOI: 10.5194/cp-18-1125-2022 2022
- Do Southern Hemisphere tree rings record past volcanic events' A case
study from New Zealand
Abstract: Do Southern Hemisphere tree rings record past volcanic events' A case study from New Zealand
Philippa A. Higgins, Jonathan G. Palmer, Chris S. M. Turney, Martin S. Andersen, and Fiona Johnson
Clim. Past, 18, 1169–1188, https://doi.org/10.5194/cp-18-1169-2022, 2022
We studied eight New Zealand tree species and identified differences in their responses to large volcanic eruptions. The response is dependent on the species and how well it can tolerate stress, but substantial within-species differences are also observed depending on site factors, including altitude and exposure. This has important implications for tree-ring temperature reconstructions because site selection and compositing methods can change the magnitude of observed volcanic cooling.
PubDate: Tue, 24 May 2022 22:22:02 +020
DOI: 10.5194/cp-18-1169-2022 2022
- Prospects for dendroanatomy in paleoclimatology – a case study on Picea
engelmannii from the Canadian Rockies
Abstract: Prospects for dendroanatomy in paleoclimatology – a case study on Picea engelmannii from the Canadian Rockies
Kristina Seftigen, Marina V. Fonti, Brian Luckman, Miloš Rydval, Petter Stridbeck, Georg von Arx, Rob Wilson, and Jesper Björklund
Clim. Past, 18, 1151–1168, https://doi.org/10.5194/cp-18-1151-2022, 2022
New proxies and improvements in existing methodologies are needed to advance paleoclimate research. This study explored dendroanatomy, the analysis of wood anatomical parameters in dated tree rings, of Engelmann spruce from the Columbia Icefield area, Canada, as a proxy of past temperatures. Our new parameters compare favorably with state of the art proxy parameters from X-ray and visible light techniques, particularly with respect to the temporal stability of the temperature signal.
PubDate: Tue, 24 May 2022 22:22:02 +020
DOI: 10.5194/cp-18-1151-2022 2022
- Expression of the “4.2 ka event” in the southern Rocky
Mountains, USA
Abstract: Expression of the “4.2 ka event” in the southern Rocky Mountains, USA
David T. Liefert and Bryan N. Shuman
Clim. Past, 18, 1109–1124, https://doi.org/10.5194/cp-18-1109-2022, 2022
A large drought potentially occurred roughly 4200 years ago, but its impacts and significance are unclear. We find new evidence in carbonate oxygen isotopes from a mountain lake in southeastern Wyoming, southern Rocky Mountains, of an abrupt reduction in effective moisture (precipitation–evaporation) or snowpack from approximately 4200–4000 years ago. The drought's prominence among a growing number of sites in the North American interior suggests it was a regionally substantial climate event.
PubDate: Mon, 23 May 2022 22:22:02 +020
DOI: 10.5194/cp-18-1109-2022 2022
- Atmosphere-cryosphere interactions at 21 ka BP in the European Alps
Abstract: Atmosphere-cryosphere interactions at 21 ka BP in the European Alps
Costanza Del Gobbo, Renato R. Colucci, Giovanni Monegato, Manja Žebre, and Filippo Giorgi
Clim. Past Discuss., https//doi.org/10.5194/cp-2022-43,2022
Preprint under review for CP (discussion: open, 0 comments)
We studied the atmosphere-cryosphere interaction during the Last Glacial Maximum (LGM) in the Alpine region, using a high-resolution regional climate model. We analyzed the climate south and north of the Alps and provide a detailed map of the Alpine Equilibrium Line Altitude (ELA) as well as an analysis of the mechanism that sustained the Alpine glaciers at the LGM. Genoa low and a mild Mediterranean Sea led to frequent snowfall in the southern Alps, preserving the glaciers and lowering the ELA.
PubDate: Mon, 23 May 2022 22:22:02 +020
DOI: 10.5194/cp-2022-432022
- Climatic, weather, and socio-economic conditions corresponding to the
mid-17th-century eruption cluster
Abstract: Climatic, weather, and socio-economic conditions corresponding to the mid-17th-century eruption cluster
Markus Stoffel, Christophe Corona, Francis Ludlow, Michael Sigl, Heli Huhtamaa, Emmanuel Garnier, Samuli Helama, Sébastien Guillet, Arlene Crampsie, Katrin Kleemann, Chantal Camenisch, Joseph McConnell, and Chaochao Gao
Clim. Past, 18, 1083–1108, https://doi.org/10.5194/cp-18-1083-2022, 2022
The mid-17th century saw several volcanic eruptions, deteriorating climate, political instability, and famine in Europe, China, and Japan. We analyze impacts of the eruptions on climate but also study their socio-political context. We show that an unambiguous distinction of volcanic cooling or wetting from natural climate variability is not straightforward. It also shows that political instability, poor harvest, and famine cannot only be attributed to volcanic climatic impacts.
PubDate: Fri, 20 May 2022 21:14:13 +020
DOI: 10.5194/cp-18-1083-2022 2022
- Precessional pacing of tropical ocean carbon export during the Late
Cretaceous
Abstract: Precessional pacing of tropical ocean carbon export during the Late Cretaceous
Ji-Eun Kim, Thomas Westerhold, Laia Alegret, Anna Joy Drury, Ursula Röhl, and Elizabeth M. Griffith
Clim. Past Discuss., https//doi.org/10.5194/cp-2022-42,2022
Preprint under review for CP (discussion: open, 0 comments)
This study attempts to get a better understanding of the marine biological carbon pump and ecosystem functioning under warmer than today conditions. Our records from marine sediments show the Pacific tropical marine biological carbon pump was driven by variations in seasonal insolation in the tropics during the late Cretaceous and may play a key role in modulating climate and the carbon cycle globally in the future.
PubDate: Thu, 19 May 2022 21:14:13 +020
DOI: 10.5194/cp-2022-422022
- Quantifying and reducing researcher subjectivity in the generation of
climate indices from documentary sources
Abstract: Quantifying and reducing researcher subjectivity in the generation of climate indices from documentary sources
George C. D. Adamson, David J. Nash, and Stefan W. Grab
Clim. Past, 18, 1071–1081, https://doi.org/10.5194/cp-18-1071-2022, 2022
Descriptions of climate held in archives are a valuable source of past climate variability, but there is a large potential for error in assigning quantitative indices (e.g. −2, v. dry to +2, v. wet) to descriptive data. This is the first study to examine this uncertainty. We gave the same dataset to 71 postgraduate students and 6 professional scientists, findings that error can be minimized by taking an average of indices developed by eight postgraduates and only two professional climatologists.
PubDate: Tue, 17 May 2022 11:53:26 +020
DOI: 10.5194/cp-18-1071-2022 2022
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