|
|
- Deoxygenation dynamics on the western Nile deep-sea fan during sapropel S1
from seasonal to millennial timescales
Abstract: Deoxygenation dynamics on the western Nile deep-sea fan during sapropel S1 from seasonal to millennial timescales
Cécile L. Blanchet, Rik Tjallingii, Anja M. Schleicher, Stefan Schouten, Martin Frank, and Achim Brauer
Clim. Past, 17, 1025–1050, https://doi.org/10.5194/cp-17-1025-2021, 2021
The Mediterranean Sea turned repeatedly into an oxygen-deprived basin during the geological past, as evidenced by distinct sediment layers called sapropels. We use here records of the last sapropel S1 retrieved in front of the Nile River to explore the relationships between riverine input and seawater oxygenation. We decipher the seasonal cycle of fluvial input and seawater chemistry as well as the decisive influence of primary productivity on deoxygenation at millennial timescales.
PubDate: 2021-05-12T02:20:21+02:00
- North Atlantic marine biogenic silica accumulation through the
early-to-mid Paleogene: implications for ocean circulation and silicate
weathering feedback
Abstract: North Atlantic marine biogenic silica accumulation through the early-to-mid Paleogene: implications for ocean circulation and silicate weathering feedback
Jakub Witkowski, Karolina Bryłka, Steven M. Bohaty, Elżbieta Mydłowska, Donald E. Penman, and Bridget S. Wade
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-50,2021
Preprint under review for CP (discussion: open, 0 comments)
We reconstruct the history of biogenic opal accumulation through the early-to-mid Paleogene in the western North Atlantic Ocean. Biogenic opal accumulation was controlled by deep-water temperatures, atmospheric greenhouse gas levels, and continental weathering intensity. Overturning circulation in the Atlantic was established at the end of the extreme early Eocene greenhouse warmth period. We also show that the strength of the link between climate and continental weathering varies through time.
PubDate: 2021-05-12T02:20:21+02:00
- Holocene vegetation transitions and their climatic drivers in MPI-ESM1.2
Abstract: Holocene vegetation transitions and their climatic drivers in MPI-ESM1.2
Anne Dallmeyer, Martin Claussen, Stephan J. Lorenz, Michael Sigl, Matthew Toohey, and Ulrike Herzschuh
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-51,2021
Preprint under review for CP (discussion: open, 0 comments)
Using the comprehensive Earth System Model MPI-ESM1.2, we explore the global Holocene vegetation changes and interpret them in terms of the Holocene climate change. The model results reveal that most of the Holocene vegetation transitions seen outside the high northern latitudes can be attributed to modifications in the intensity of the global summer monsoons.
PubDate: 2021-05-11T23:32:13+02:00
- Climate variability and grain production in Scania, c. 1702–1911
Abstract: Climate variability and grain production in Scania, c. 1702–1911
Martin Karl Skoglund
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-52,2021
Preprint under review for CP (discussion: open, 0 comments)
This article finds that grain farming in historical Scania (c. 1700–1900) performed better during relatively wet and cold summers, while being relatively resilient towards climate conditions in the spring and autumn. This contrasts with contemporary grain farming in the region which is more oriented towards modern wheat varieties that prefers warmer conditions. At the same time, historical farmers faced a threat common with contemporary farmers: summer droughts, like that of the summer of 2018.
PubDate: 2021-05-10T23:32:13+02:00
- Large-scale climate signals of a European oxygen isotope network from tree
rings
Abstract: Large-scale climate signals of a European oxygen isotope network from tree rings
Daniel F. Balting, Monica Ionita, Martin Wegmann, Gerhard Helle, Gerhard H. Schleser, Norel Rimbu, Mandy B. Freund, Ingo Heinrich, Diana Caldarescu, and Gerrit Lohmann
Clim. Past, 17, 1005–1023, https://doi.org/10.5194/cp-17-1005-2021, 2021
To extend climate information back in time, we investigate the climate sensitivity of a δ18O network from tree rings, consisting of 26 European sites and covering the last 400 years. Our results suggest that the δ18O variability is associated with large-scale anomaly patterns that resemble those observed for the El Niño–Southern Oscillation. We conclude that the investigation of large-scale climate signals far beyond instrumental records can be done with a δ18O network derived from tree rings.
PubDate: 2021-05-07T15:24:26+02:00
- Comparison of the oxygen isotope signatures in speleothem records and
iHadCM3 model simulations for the last millennium
Abstract: Comparison of the oxygen isotope signatures in speleothem records and iHadCM3 model simulations for the last millennium
Janica C. Bühler, Carla Roesch, Moritz Kirschner, Louise Sime, Max D. Holloway, and Kira Rehfeld
Clim. Past, 17, 985–1004, https://doi.org/10.5194/cp-17-985-2021, 2021
We present three new isotope-enabled simulations for the last millennium (850–1850 CE) and compare them to records from a global speleothem database. Offsets between the simulated and measured oxygen isotope ratios are fairly small. While modeled oxygen isotope ratios are more variable on decadal timescales, proxy records are more variable on (multi-)centennial timescales. This could be due to a lack of long-term variability in complex model simulations, but proxy biases cannot be excluded.
PubDate: 2021-05-05T15:24:26+02:00
- Reconstruction and analysis of extreme drought and flood events in the
Hanjiang River basin since 1426
Abstract: Reconstruction and analysis of extreme drought and flood events in the Hanjiang River basin since 1426
Xiaodan Zhang, Guoyu Ren, Yuda Yang, He Bing, Zhixin Hao, and Panfeng Zhang
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-43,2021
Preprint under review for CP (discussion: open, 0 comments)
This study, by using the yearly drought and flood grades reconstructed based on historical documents, and a set of criteria for identifying extreme droughts and floods, constructs a historical series of extreme droughts and floods in the Hanjiang River Basin from 1426–2017. The possible linkages of extreme droughts and floods with Asian monsoon , strong ENSO and large volcanic eruptions were also discussed.
PubDate: 2021-05-05T15:24:26+02:00
- CHELSA-TraCE21k v1.0. Downscaled transient temperature and precipitation
data since the last glacial maximum
Abstract: CHELSA-TraCE21k v1.0. Downscaled transient temperature and precipitation data since the last glacial maximum
Dirk Nikolaus Karger, Michael P. Nobis, Signe Normand, Catherine H. Graham, and Niklaus E. Zimmermann
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-30,2021
Preprint under review for CP (discussion: open, 0 comments)
Here we present global monthly climatologies for temperature and precipitation at high spatial resolution for the last 21,000 years. The topography at all time steps is created by combining high resolution information on glacial cover from current and Last Glacial Maximum glacier databases with the interpolation of an ice sheet model and a coupling to mean annual temperatures from a global circulation model.
PubDate: 2021-05-03T16:32:12+02:00
- Dating of an East Antarctic ice core (GV7) by high resolution chemical
stratigraphies
Abstract: Dating of an East Antarctic ice core (GV7) by high resolution chemical stratigraphies
Raffaello Nardin, Mirko Severi, Alessandra Amore, Silvia Becagli, Francois Burgay, Laura Caiazzo, Virginia Ciardini, Giuliano Dreossi, Massimo Frezzotti, Sang-Bum Hong, Ishaq Khan, Bianca Maria Narcisi, Marco Proposito, Claudio Scarchilli, Enricomaria Selmo, Andrea Spolaor, Barbara Stenni, and Rita Traversi
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-44,2021
Preprint under review for CP (discussion: open, 0 comments)
The first step to exploit all the potential information buried into ice cores is to produce a reliable age scale. Basing on chemical and isotopic stratigraphies from the 197 m long Antarctic GV7 ice core, an accurate dating was achieved showing that the archive spans roughly the last 830 years. The relatively high accumulation rate allowed using the non-sea salt-sulphate seasonal pattern for counting annual layers. Accumulation rate reconstruction exhibited a slight rise since 18th century.
PubDate: 2021-05-03T16:32:12+02:00
- On the phenomenon of the blue sun
Abstract: On the phenomenon of the blue sun
Nellie Wullenweber, Anna Lange, Alexei Rozanov, and Christian von Savigny
Clim. Past, 17, 969–983, https://doi.org/10.5194/cp-17-969-2021, 2021
This study investigates the physical processes leading to the rare phenomenon of the sun appearing blue or green. The phenomenon is caused by anomalous scattering by, e.g., volcanic or forest fire aerosols. Unlike most other studies, our study includes a full treatment of the effect of Rayleigh scattering on the colour of the sun. We investigate different factors and revisit a historic example, i.e. the Canadian forest fires in 1950, that led to blue sun events in different European countries.
PubDate: 2021-04-30T16:32:12+02:00
- Climate & Ecology in the Rocky Mountain Interior After the Early Eocene
Climatic Optimum
Abstract: Climate & Ecology in the Rocky Mountain Interior After the Early Eocene Climatic Optimum
Rebekah A. Stein, Nathan D. Sheldon, Sarah E. Allen, Michael E. Smith, Rebecca M. Dzombak, and Brian R. Jicha
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-45,2021
Preprint under review for CP (discussion: open, 0 comments)
Modern climate change drives us to look to the past to understand how well prior life adapted to warm periods. During the early Eocene, a warm period approximately 50 million years ago, southwest Wyoming was covered by a giant lake. This lake and surrounding environments made for excellent preservation of ancient soils, plant fossils, and more. Using geochemical tools and plant fossils, we determine the region was a warm, wet forest and that elevated temperatures were maintained by volcanoes.
PubDate: 2021-04-29T16:32:12+02:00
- Does a difference in ice sheets between Marine Isotope Stages 3 and 5a
affect the duration of stadials'
Abstract: Does a difference in ice sheets between Marine Isotope Stages 3 and 5a affect the duration of stadials'
Sam Sherriff-Tadano, Ayako Abe-Ouchi, Akira Oka, Takahito Mitsui, and Fuyuki Saito
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-47,2021
Preprint under review for CP (discussion: open, 0 comments)
Glacial periods underwent climate shifts between warm states and cold states on a millennial time-scale. Frequency of these climate shifts varied along time, and it was shorter during mid-glacial period compared to early-glacial period. In this study, from climate simulations of early and mid-glacial periods with a comprehensive climate model, we show that the larger ice sheet in mid-glacial compared to early-glacial could contributed to the frequent climate shifts during mid-glacial period.
PubDate: 2021-04-29T16:32:12+02:00
- 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 Discuss., https://doi.org/10.5194/cp-2021-36,2021
Preprint under review for CP (discussion: open, 2 comments)
We present a method to reconstruct burnt area using a relationship between pollen and charcoal abundances, and 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 high burnt area during warming intervals and low burnt area when the climate was cooler and/or wetter than today.
PubDate: 2021-04-29T16:32:12+02:00
- Tree-ring-based spring precipitation reconstruction in the Sikhote-Alin'
Mountain range
Abstract: Tree-ring-based spring precipitation reconstruction in the Sikhote-Alin' Mountain range
Olga Ukhvatkina, Alexander Omelko, Dmitriy Kislov, Alexander Zhmerenetsky, Tatyana Epifanova, and Jan Altman
Clim. Past, 17, 951–967, https://doi.org/10.5194/cp-17-951-2021, 2021
We present the first precipitation reconstructions for three sites along a latitudinal gradient in the Sikhote-Alin' mountains (Russian Far East). The reconstructions are based on Korean pine tree rings. We found that an important limiting factor for this species growth was precipitation during the spring-to-early-summer period. The periodicity found in our reconstructions suggests the influence of El Niño–Southern Oscillation and Pacific Dedacadal Oscillation on the region's climate.
PubDate: 2021-04-28T16:32:12+02:00
- Could phenological records from Chinese poems of the Tang and Song
dynasties (618–1279 CE) be reliable evidence of past climate
changes'
Abstract: Could phenological records from Chinese poems of the Tang and Song dynasties (618–1279 CE) be reliable evidence of past climate changes'
Yachen Liu, Xiuqi Fang, Junhu Dai, Huanjiong Wang, and Zexing Tao
Clim. Past, 17, 929–950, https://doi.org/10.5194/cp-17-929-2021, 2021
There are controversies about whether poetry can be used as one of the evidence sources for past climate changes. We tried to discuss the reliability and validity of phenological records from poems of the Tang and Song dynasties (618–1279 CE) by analyzing their certainties and uncertainties. A standardized processing method for phenological records from poems is introduced. We hope that this study can provide a reference for the extraction and application of phenological records from poems.
PubDate: 2021-04-28T16:32:12+02:00
- Climate and ice sheet evolutions from the last glacial maximum to the
pre-industrial period with an ice sheet – climate coupled model
Abstract: Climate and ice sheet evolutions from the last glacial maximum to the pre-industrial period with an ice sheet – climate coupled model
Aurélien Quiquet, Didier M. Roche, Christophe Dumas, Nathaëlle Bouttes, and Fanny Lhardy
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-39,2021
Preprint under review for CP (discussion: open, 0 comments)
In this paper we discuss results obtained with a set of coupled ice sheet – climate model experiments for the last 26 kyrs. The model displays a large sensitivity of the oceanic circulation to the amount of the freshwater flux resulting from ice sheet melting. Ice sheet geometry changes alone are not enough to lead to abrupt climate events and rapid warming at high latitudes are here only reported during abrupt oceanic circulation recoveries that occurred when accounting for freshwater flux.
PubDate: 2021-04-26T16:32:12+02:00
- Controlling water infrastructure and codifying water knowledge:
institutional responses to severe drought in Barcelona (1620–1650)
Abstract: Controlling water infrastructure and codifying water knowledge: institutional responses to severe drought in Barcelona (1620–1650)
Santiago Gorostiza, Maria Antònia Martí Escayol, and Mariano Barriendos
Clim. Past, 17, 913–927, https://doi.org/10.5194/cp-17-913-2021, 2021
How did cities respond to drought during the 17th century' This article studies the strategies followed by the city government of Barcelona during the severely dry period from 1620 to 1650. Beyond the efforts to expand urban water supply sources and to improve the maintenance of the system, the city government decided to compile knowledge about water infrastructure into a book and to restrict access to it. This management strategy aimed to increase the city's control over water.
PubDate: 2021-04-23T16:32:12+02:00
- Dynamics of the Mediterranean droughts from 850 to 2099 CE in the
Community Earth System Model
Abstract: Dynamics of the Mediterranean droughts from 850 to 2099 CE in the Community Earth System Model
Woon Mi Kim and Christoph C. Raible
Clim. Past, 17, 887–911, https://doi.org/10.5194/cp-17-887-2021, 2021
The analysis of the dynamics of western central Mediterranean droughts for 850–2099 CE in the Community Earth System Model indicates that past Mediterranean droughts were driven by the internal variability. This internal variability is more important during the initial years of droughts. During the transition years, the longevity of droughts is defined by the land–atmosphere feedbacks. In the future, this land–atmosphere feedbacks are intensified, causing a constant dryness over the region.
PubDate: 2021-04-22T16:32:12+02:00
- Land–sea temperature contrasts at the Last Interglacial and their impact
on the hydrological cycle
Abstract: Land–sea temperature contrasts at the Last Interglacial and their impact on the hydrological cycle
Nicholas King-Hei Yeung, Laurie Menviel, Katrin J. Meissner, Andréa S. Taschetto, Tilo Ziehn, and Matthew Chamberlain
Clim. Past, 17, 869–885, https://doi.org/10.5194/cp-17-869-2021, 2021
The Last Interglacial period (LIG) is characterised by strong orbital forcing compared to the pre-industrial period (PI). This study compares the mean climate state of the LIG to the PI as simulated by the ACCESS-ESM1.5, with a focus on the southern hemispheric monsoons, which are shown to be consistently weakened. This is associated with cooler terrestrial conditions in austral summer due to decreased insolation, and greater pressure and subsidence over land from Hadley cell strengthening.
PubDate: 2021-04-21T16:32:12+02:00
- The 1921 European drought: Impacts, reconstruction and drivers
Abstract: The 1921 European drought: Impacts, reconstruction and drivers
Gerard van der Schrier, Richard P. Allan, Albert Ossó, Pedro M. Sousa, Hans Van de Vyver, Bert Van Schaeybroeck, Roberto Coscarelli, Angela A. Pasqua, Olga Petrucci, Mary Curley, Mirosław Mietus, Janusz Filipiak, Petr Štěpánek, Pavel Zahradníček, Rudolf Brázdil, Ladislava Řezníčková, Else J. M. van den Besselaar, Ricardo Trigo, and Enric Aguilar
Clim. Past Discuss., https://doi.org/10.5194/cp-2021-41,2021
Preprint under review for CP (discussion: open, 0 comments)
The 1921 drought is the most severe European drought since 1900. Its impacts on society and the physical characteristics are described using newly recovered meteorological observations and a survey from newspapers reports. Finally, the drivers of the drought are analysed. While none of the seasons in 1920 and 1921 tops the scale of having the largest precipitation deficit on record, the conservative nature of drought amplifies the lack of rain in late 1920 into the 1921 spring and summer.
PubDate: 2021-04-21T16:32:12+02:00
|
Open Access journal
