 Subjects -> METEOROLOGY (Total: 106 journals)
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- Nonlinear increase in seawater 87Sr/86Sr in the Oligocene to early Miocene
and implications for climate-sensitive weathering
Abstract: Nonlinear increase in seawater 87Sr/86Sr in the Oligocene to early Miocene and implications for climate-sensitive weathering
Heather M. Stoll, Leopoldo D. Pena, Ivan Hernandez-Almeida, José Guitián, Thomas Tanner, and Heiko Paelike
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-29,2023
Preprint under review for CP (discussion: open, 0 comments)
The Oligocene and Early Miocene periods featured dynamic glacial cycles on Antarctica. In this paper, we use Sr isotopes in marine carbonate sediments to document a change in the location and intensity of continental weathering during short periods of very intense Antartic glaciation. Potentially, the weathering intensity of old continental rocks on Antarctica was reduced during glaciation. We also show improved age models for correlation of Southern ocean and North Atlantic sediments.
PubDate: Tue, 23 May 2023 14:15:09 +020
DOI: 10.5194/cp-2023-292023
- Methane, ethane, and propane production in Greenland ice core samples and
a first isotopic characterization of excess methane
Abstract: Methane, ethane, and propane production in Greenland ice core samples and a first isotopic characterization of excess methane
Michaela Mühl, Jochen Schmitt, Barbara Seth, James E. Lee, Jon S. Edwards, Edward J. Brook, Thomas Blunier, and Hubertus Fischer
Clim. Past, 19, 999–1025, https://doi.org/10.5194/cp-19-999-2023, 2023
Our ice core measurements show that methane, ethane, and propane concentrations are significantly elevated above their past atmospheric background for Greenland ice samples containing mineral dust. The underlying co-production process happens during the classical discrete wet extraction of air from the ice sample and affects previous reconstructions of the inter-polar difference of methane as well as methane stable isotope records derived from dust-rich Greenland ice.
PubDate: Mon, 22 May 2023 14:15:09 +020
DOI: 10.5194/cp-19-999-2023 2023
- Do phenomenological dynamical paleoclimate models have physical similarity
with Nature' Seemingly, not all of them do
Abstract: Do phenomenological dynamical paleoclimate models have physical similarity with Nature' Seemingly, not all of them do
Mikhail Y. Verbitsky and Michel Crucifix
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-30,2023
Preprint under review for CP (discussion: open, 0 comments)
Are phenomenological dynamical paleoclimate models physically similar to Nature' We demonstrated that though they may be very accurate in reproducing empirical time series this is not sufficient to claim physical similarity with Nature until similarity parameters are considered. We suggest that the diagnostics of physical similarity should become a standard procedure before a phenomenological model can be utilized for interpretations of historical records or for future predictions.
PubDate: Mon, 22 May 2023 14:15:09 +020
DOI: 10.5194/cp-2023-302023
- A transient CGCM simulation of the past 3 million years
Abstract: A transient CGCM simulation of the past 3 million years
Kyung-Sook Yun, Axel Timmermann, Sun-Seon Lee, Matteo Willeit, Andrey Ganopolski, and Jyoti Jadhav
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-34,2023
Preprint under review for CP (discussion: open, 0 comments)
To quantify the sensitivity of the earth system to orbital-scale forcings we conducted an unprecedented quasi-continuous coupled general climate model simulation with the Community Earth System Model, which covers the climatic history of the past 3 million years ago. This study could stimulate future transient paleo-climate model simulations and perspectives to further highlight and document the effect of anthropogenic CO2 emissions in the broader paleo-climatic context.
PubDate: Mon, 22 May 2023 14:15:09 +020
DOI: 10.5194/cp-2023-342023
- Coccolithus pelagicus subsp. braarudii morphological plasticity in
response to variations in the Canary region upwelling system over the past
250 ka
Abstract: Coccolithus pelagicus subsp. braarudii morphological plasticity in response to variations in the Canary region upwelling system over the past 250 ka
Gonçalo Prista, Áurea Narciso, and Mário Cachão
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-31,2023
Preprint under review for CP (discussion: open, 0 comments)
Upwelling regions have great ecological, social, and economic importance, but predicting the effects of future climate change on upwelling systems is extremely difficult. One of the best tools we have is to look into the past and study their response to climate events. However, good proxies are hard to find due to different reasons. Here we show how using fossil coccolithophores, unicellular algae with calcified scales, is a promising tool, by using size variation to infer upwelling intensity.
PubDate: Tue, 16 May 2023 15:50:02 +020
DOI: 10.5194/cp-2023-312023
- The effect of uncertainties in natural forcing records on simulated
temperature during the last millennium
Abstract: The effect of uncertainties in natural forcing records on simulated temperature during the last millennium
Lucie J. Lücke, Andrew P. Schurer, Matthew Toohey, Lauren R. Marshall, and Gabriele C. Hegerl
Clim. Past, 19, 959–978, https://doi.org/10.5194/cp-19-959-2023, 2023
Evidence from tree rings and ice cores provides incomplete information about past volcanic eruptions and the Sun's activity. We model past climate with varying solar and volcanic scenarios and compare it to reconstructed temperature. We confirm that the Sun's influence was small and that uncertain volcanic activity can strongly influence temperature shortly after the eruption. On long timescales, independent data sources closely agree, increasing our confidence in understanding of past climate.
PubDate: Mon, 15 May 2023 15:50:02 +020
DOI: 10.5194/cp-19-959-2023 2023
- Environmental changes during the onset of the Late Pliensbachian Event
(Early Jurassic) in the Cardigan Bay Basin, Wales
Abstract: Environmental changes during the onset of the Late Pliensbachian Event (Early Jurassic) in the Cardigan Bay Basin, Wales
Teuntje P. Hollaar, Stephen P. Hesselbo, Jean-François Deconinck, Magret Damaschke, Clemens V. Ullmann, Mengjie Jiang, and Claire M. Belcher
Clim. Past, 19, 979–997, https://doi.org/10.5194/cp-19-979-2023, 2023
Palaeoclimatological reconstructions aid our understanding of current and future climate change. In the Pliensbachian (Early Jurassic) a climatic cooling event occurred globally. We show that this cooling event has a significant impact on the depositional environment of the Cardigan Bay basin but that the 405 kyr eccentricity cycle remained the dominant control on terrestrial and marine depositional processes.
PubDate: Mon, 15 May 2023 15:50:02 +020
DOI: 10.5194/cp-19-979-2023 2023
- Drought reconstruction since 1796 CE based on tree-ring widths in the
Upper Heilongjiang (Amur) River Basin in Northeast Asia, and its linkage
to Pacific Ocean climate variability
Abstract: Drought reconstruction since 1796 CE based on tree-ring widths in the Upper Heilongjiang (Amur) River Basin in Northeast Asia, and its linkage to Pacific Ocean climate variability
Yang Xu, Heli Zhang, Feng Chen, Shijie Wang, Mao Hu, Martín Hadad, and Fidel Roig
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-28,2023
Preprint under review for CP (discussion: open, 0 comments)
We reconstructed the monthly mean scPDSI for May–July in the Upper Heilongjiang (Amur) Basin since 1796. Our analysis suggests that the dry/wet variability in the Upper Heilongjiang (Amur) River Basin is related to several large-scale climate stresses and atmospheric circulation patterns (the ENSO and Silk Road models). the cause of drought is primarily a reduction in advective water vapor transport, rather than precipitation circulation processes.
PubDate: Wed, 10 May 2023 12:33:08 +020
DOI: 10.5194/cp-2023-282023
- Quantifying the contribution of forcing and three prominent modes of
variability to historical climate
Abstract: Quantifying the contribution of forcing and three prominent modes of variability to historical climate
Andrew P. Schurer, Gabriele C. Hegerl, Hugues Goosse, Massimo A. Bollasina, Matthew H. England, Michael J. Mineter, Doug M. Smith, and Simon F. B. Tett
Clim. Past, 19, 943–957, https://doi.org/10.5194/cp-19-943-2023, 2023
We adopt an existing data assimilation technique to constrain a model simulation to follow three important modes of variability, the North Atlantic Oscillation, El Niño–Southern Oscillation and the Southern Annular Mode. How it compares to the observed climate is evaluated, with improvements over simulations without data assimilation found over many regions, particularly the tropics, the North Atlantic and Europe, and discrepancies with global cooling following volcanic eruptions are reconciled.
PubDate: Tue, 09 May 2023 12:33:08 +020
DOI: 10.5194/cp-19-943-2023 2023
- Dansgaard–Oeschger events in climate models: review and baseline Marine
Isotope Stage 3 (MIS3) protocol
Abstract: Dansgaard–Oeschger events in climate models: review and baseline Marine Isotope Stage 3 (MIS3) protocol
Irene Malmierca-Vallet, Louise C. Sime, and the D–O community members
Clim. Past, 19, 915–942, https://doi.org/10.5194/cp-19-915-2023, 2023
Greenland ice core records feature Dansgaard–Oeschger (D–O) events, abrupt warming episodes followed by a gradual-cooling phase during mid-glacial periods. There is uncertainty whether current climate models can effectively represent the processes that cause D–O events. Here, we propose a Marine Isotopic Stage 3 (MIS3) baseline protocol which is intended to provide modelling groups investigating D–O oscillations with a common framework.
PubDate: Mon, 08 May 2023 12:33:08 +020
DOI: 10.5194/cp-19-915-2023 2023
- Miocene Antarctic ice sheet area responds significantly faster than volume
to CO2-induced climate change
Abstract: Miocene Antarctic ice sheet area responds significantly faster than volume to CO2-induced climate change
Lennert B. Stap, Constantijn J. Berends, and Roderik S. W. van de Wal
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-12,2023
Preprint under review for CP (discussion: open, 0 comments)
Analyzing simulations of Antarctic ice sheet variability during the early and mid-Miocene (23 to 14 million years ago), we find that the ice sheet area responds faster and more strongly than volume to climate change on quasi-orbital timescales. Considering the recent discovery that ice area, rather than volume, influences deep ocean temperatures, this implies that the Miocene Antarctic ice sheet affects deep ocean temperatures more than its volume suggests.
PubDate: Mon, 08 May 2023 12:33:08 +020
DOI: 10.5194/cp-2023-122023
- Climate and Disease: the connection between temperature values and
precipitation rates and the probability of death due to waterborne and
airborne diseases in historical urban space (the evidence from Poznań,
Poland)
Abstract: Climate and Disease: the connection between temperature values and precipitation rates and the probability of death due to waterborne and airborne diseases in historical urban space (the evidence from Poznań, Poland)
Grażyna Liczbińska, Jörg Peter Vögele, and Marek Brabec
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-26,2023
Preprint under review for CP (discussion: open, 0 comments)
The study examines the relationship between temperature values and precipitation rates as explanatory variables and the probability of death due to waterborne, airborne, and other diseases in historical urban space. So far, the literature has not been focused on epidemiology of 19th -century Polish urban areas in climatological context. We used individual data on mortality from Poznań parish death registers for 1850–1900. We studied the relationship between weather conditions and mortality.
PubDate: Mon, 08 May 2023 12:33:08 +020
DOI: 10.5194/cp-2023-262023
- Reconstructing atmospheric H2 over the past century from bi-polar firn air
records
Abstract: Reconstructing atmospheric H2 over the past century from bi-polar firn air records
John D. Patterson, Murat Aydin, Andrew M. Crotwell, Gabrielle Pétron, Jeffery P. Severinghaus, Paul B. Krummel, Ray L. Langenfelds, Vasilii V. Petrenko, and Eric S. Saltzman
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-27,2023
Preprint under review for CP (discussion: open, 0 comments)
Atmospheric levels of molecular hydrogen (H2) can impact climate and air quality. Constraining past changes to atmospheric H2 is useful for understanding how H2 cycles through the Earth system and predicting the impacts of increasing anthropogenic emissions under the "Hydrogen Economy." Here, we use the aging air found in the polar snowpack to reconstruct H2 levels over the past 100 years. We find that H2 levels increased by 30 % over Greenland and 60 % over Antarctica during the 20th century.
PubDate: Fri, 05 May 2023 15:11:34 +020
DOI: 10.5194/cp-2023-272023
- Late Aptian paleoclimate reconstruction of Brazilian equatorial margin:
inferences from palynology
Abstract: Late Aptian paleoclimate reconstruction of Brazilian equatorial margin: inferences from palynology
Michelle Cardoso da Silva Giannerini, Marcelo de Araujo Carvalho, Cecília Cunha Lana, Gustavo Santiago, Natália de Paula Sá, and Gabriel da Cunha Correia
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-22,2023
Preprint under review for CP (discussion: open, 0 comments)
This study analyzed ancient climate patterns using plant fossils called palynomorphs. We identified 69 different palynomorphs from different plant groups (e.g., ferns, gymnosperms, angiosperms), and used statistical methods to support our findings. We found a trend towards increased humidity, likely influenced by a weather phenomenon called the Intertropical Convergence Zone.
PubDate: Fri, 05 May 2023 15:11:34 +020
DOI: 10.5194/cp-2023-222023
- Atlantic circulation changes across a stadial–interstadial
transition
Abstract: Atlantic circulation changes across a stadial–interstadial transition
Claire Waelbroeck, Jerry Tjiputra, Chuncheng Guo, Kerim H. Nisancioglu, Eystein Jansen, Natalia Vázquez Riveiros, Samuel Toucanne, Frédérique Eynaud, Linda Rossignol, Fabien Dewilde, Elodie Marchès, Susana Lebreiro, and Silvia Nave
Clim. Past, 19, 901–913, https://doi.org/10.5194/cp-19-901-2023, 2023
The precise geometry and extent of Atlantic circulation changes that accompanied rapid climate changes of the last glacial period are still unknown. Here, we combine carbon isotopic records from 18 Atlantic sediment cores with numerical simulations and decompose the carbon isotopic change across a cold-to-warm transition into remineralization and circulation components. Our results show that the replacement of southern-sourced by northern-sourced water plays a dominant role below ~ 3000 m depth.
PubDate: Thu, 04 May 2023 15:11:34 +020
DOI: 10.5194/cp-19-901-2023 2023
- Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and
radiocarbon budget closure across the last deglaciation
Abstract: Rejuvenating the ocean: mean ocean radiocarbon, CO2 release, and radiocarbon budget closure across the last deglaciation
Luke Cameron Skinner, Francois Primeau, Aurich Jeltsch-Thömmes, Fortunat Joos, Peter Köhler, and Edouard Bard
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-24,2023
Preprint under review for CP (discussion: open, 0 comments)
Radiocarbon is best known as a dating tool, but it also allows us to track CO2 exchange between the ocean and atmosphere. Using decades of data and novel mapping methods, we have charted the ocean’s average radiocarbon 'age' since the last Ice Age. Combined with climate model simulations, these data quantify the ocean’s role in atmospheric CO2 rise since the last ice Age, while also revealing that Earth likely received far more cosmic radiation during the last Ice Age than hitherto believed.
PubDate: Thu, 04 May 2023 15:11:34 +020
DOI: 10.5194/cp-2023-242023
- Summer surface air temperature proxies point to near-sea-ice-free
conditions in the Arctic at 127 ka
Abstract: Summer surface air temperature proxies point to near-sea-ice-free conditions in the Arctic at 127 ka
Louise C. Sime, Rahul Sivankutty, Irene Vallet-Malmierca, Agatha M. de Boer, and Marie Sicard
Clim. Past, 19, 883–900, https://doi.org/10.5194/cp-19-883-2023, 2023
It is not known if the Last Interglacial (LIG) experienced Arctic summers that were sea ice free: models show a wide spread in LIG Arctic temperature and sea ice results. Evaluation against sea ice markers is hampered by few observations. Here, an assessment of 11 climate model simulations against summer temperatures shows that the most skilful models have a 74 %–79 % reduction in LIG sea ice. The measurements of LIG areas indicate a likely mix of ice-free and near-ice-free LIG summers.
PubDate: Tue, 02 May 2023 15:11:34 +020
DOI: 10.5194/cp-19-883-2023 2023
- Model and proxy evidence for coordinated changes in the hydroclimate of
distant regions over the Last Millennium
Abstract: Model and proxy evidence for coordinated changes in the hydroclimate of distant regions over the Last Millennium
Pedro José Roldán-Gómez, Jesús Fidel González-Rouco, Jason E. Smerdon, and Félix García-Pereira
Clim. Past Discuss., https//doi.org/10.5194/cp-2023-21,2023
Preprint under review for CP (discussion: open, 0 comments)
Analyses of reconstructed data suggest that the precipitation and availability of water has evolved in a similar way during the Last Millennium in different regions of the world, including areas of North America, Europe, the Middle East, Southern Asia, northern South America, East Africa and the Indo-Pacific. To confirm this link between distant regions and to understand the reasons behind it, the information from different reconstructed and simulated products has been compiled and analysed.
PubDate: Fri, 28 Apr 2023 00:55:54 +020
DOI: 10.5194/cp-2023-212023
- The coupled system response to 250 years of freshwater forcing: Last
Interglacial CMIP6–PMIP4 HadGEM3 simulations
Abstract: The coupled system response to 250 years of freshwater forcing: Last Interglacial CMIP6–PMIP4 HadGEM3 simulations
Maria Vittoria Guarino, Louise C. Sime, Rachel Diamond, Jeff Ridley, and David Schroeder
Clim. Past, 19, 865–881, https://doi.org/10.5194/cp-19-865-2023, 2023
We investigate the response of the atmosphere, ocean, and ice domains to the release of a large volume of glacial meltwaters thought to have occurred during the Last Interglacial period. We show that the signal that originated in the North Atlantic travels over great distances across the globe. It modifies the ocean gyre circulation in the Northern Hemisphere as well as the belt of westerly winds in the Southern Hemisphere, with consequences for Antarctic sea ice.
PubDate: Thu, 27 Apr 2023 00:55:54 +020
DOI: 10.5194/cp-19-865-2023 2023
- The ST22 chronology for the Skytrain Ice Rise ice core – Part 2: An age
model to the last interglacial and disturbed deep stratigraphy
Abstract: The ST22 chronology for the Skytrain Ice Rise ice core – Part 2: An age model to the last interglacial and disturbed deep stratigraphy
Robert Mulvaney, Eric W. Wolff, Mackenzie M. Grieman, Helene H. Hoffmann, Jack D. Humby, Christoph Nehrbass-Ahles, Rachael H. Rhodes, Isobel F. Rowell, Frédéric Parrenin, Loïc Schmidely, Hubertus Fischer, Thomas F. Stocker, Marcus Christl, Raimund Muscheler, Amaelle Landais, and Frédéric Prié
Clim. Past, 19, 851–864, https://doi.org/10.5194/cp-19-851-2023, 2023
We present an age scale for a new ice core drilled at Skytrain Ice Rise, an ice rise facing the Ronne Ice Shelf in Antarctica. Various measurements in the ice and air phases are used to match the ice core to other Antarctic cores that have already been dated, and a new age scale is constructed. The 651 m ice core includes ice that is confidently dated to 117 000–126 000 years ago, in the last interglacial. Older ice is found deeper down, but there are flow disturbances in the deeper ice.
PubDate: Thu, 27 Apr 2023 00:55:54 +020
DOI: 10.5194/cp-19-851-2023 2023
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