Varved sediment responses to early Holocene climate and environmental changes in Lake Meerfelder Maar (Germany) obtained from multivariate analyses of micro X-ray fluorescence core scanning data

2017 ◽  
Vol 32 (3) ◽  
pp. 427-436 ◽  
Author(s):  
Celia Martin-Puertas ◽  
Rik Tjallingii ◽  
Menno Bloemsma ◽  
Achim Brauer
Keyword(s):  
Environmental Changes ◽  
Multivariate Analyses ◽  
Early Holocene ◽  
Holocene Climate ◽  
X Ray ◽  
Varved Sediment

Late glacial and early Holocene climate and environmental changes in the eastern Baltic area inferred from sediment C/N ratio

2018 ◽  
Vol 61 (1) ◽  
pp. 1-16 ◽  
Author(s):  
Merlin Liiv ◽  
Tiiu Alliksaar ◽  
Leeli Amon ◽  
Rene Freiberg ◽  
Atko Heinsalu ◽  
...  
Keyword(s):  
Environmental Changes ◽  
Late Glacial ◽  
Early Holocene ◽  
Holocene Climate ◽  
Baltic Area ◽  
Eastern Baltic

scholarly journals Vegetation changes and plant wax biomarkers from an ombrotrophic bog define hydroclimate trends and human-environment interactions during the Holocene in northern Norway

The Holocene ◽  
2020 ◽  
Vol 30 (12) ◽  
pp. 1849-1865
Author(s):  
Nicholas L Balascio ◽  
R Scott Anderson ◽  
William J D’Andrea ◽  
Stephen Wickler ◽  
Robert M D’Andrea ◽  
...  
Keyword(s):  
Chain Length ◽  
Environmental Changes ◽  
Early Holocene ◽  
Vegetation Changes ◽  
Holocene Climate ◽  
Coprophilous Fungi ◽  
Human Environment ◽  
Northern Norway ◽  
Ombrotrophic Bog ◽  
Plant Wax

Holocene climate records from northern Europe improve our understanding of important North Atlantic ocean and atmospheric circulation systems to long-term insolation-driven changes, as well as more rapid forcing and feedback mechanisms. Here we assess Holocene climate and environmental changes in northern Norway based on the analysis of pollen, non-pollen palynomorphs, plant macrofossils, and plant wax biomarkers from a high latitude ombrotrophic bog. We define the extent and thickness of Hollabåttjønnen Bog (0.16 km2), which is located 10 km north of Tromsø. Several cores were analyzed, including a 5.16-m core that spans the last 9.5 cal ka BP. Vegetation changes from several sites were reconstructed and the distribution and hydrogen isotopic composition (δD) of n-alkanes (C21–C33) were analyzed. Our data show several distinct climate intervals that primarily indicate changes in bog surface moisture. In the early Holocene (c. 9.5–7.7 cal ka BP), wetter conditions are defined by the presence of wetland sedges and grasses, higher concentrations of mid-chain length n-alkanes, and a similarity in δD values among homologs. A dry mid-Holocene (c. 7.7–3.8 cal ka BP) is inferred from the presence of a heath shrubland, low peat accumulations rates, and significant differences between δD values of mid- and long-chain length n-alkanes. The late Holocene (c. 3.8 cal ka BP-present) is marked by the onset of wetter conditions, lateral bog expansion, and an increase in sedges and grasses. The Hollabåttjønnen Bog record is also significant because its margins were an important location for human settlement. We correlate early Holocene environmental conditions with changes in Stone Age structures recently excavated, and we identify the occurrence of coprophilous fungi, such as Sporormiella and Sordaria, likely associated with reindeer grazing activity beginning c. 1 cal ka BP. This site therefore provides important regional paleoclimate information as well as context for evaluating local prehistoric human-environment interactions.

Abrupt cooling repeatedly punctuated early-Holocene climate in eastern North America

The Holocene ◽  
2011 ◽  
Vol 22 (5) ◽  
pp. 525-529 ◽  
Author(s):  
Juzhi Hou ◽  
Yongsong Huang ◽  
Bryan N Shuman ◽  
W Wyatt Oswald ◽  
David R Foster
Keyword(s):  
North America ◽  
Early Holocene ◽  
Eastern North America ◽  
Holocene Climate

Small-mammal diversity in Spain during the late Pleistocene to early Holocene: Climate, landscape, and human impact

Geology ◽  
2012 ◽  
Vol 41 (2) ◽  
pp. 267-270 ◽  
Author(s):  
J. M. Lopez-Garcia ◽  
H.-A. Blain ◽  
J. I. Morales ◽  
C. Lorenzo ◽  
S. Banuls-Cardona ◽  
...  
Keyword(s):  
Human Impact ◽  
Late Pleistocene ◽  
Small Mammal ◽  
Early Holocene ◽  
Holocene Climate ◽  
Mammal Diversity

scholarly journals The Holocene thermal maximum in the Nordic Seas: the impact of Greenland Ice Sheet melt and other forcings in a coupled atmosphere–sea-ice–ocean model

2013 ◽  
Vol 9 (4) ◽  
pp. 1629-1643 ◽  
Author(s):  
M. Blaschek ◽  
H. Renssen
Keyword(s):  
Ice Sheet ◽  
Greenland Ice Sheet ◽  
Early Holocene ◽  
Surface Cooling ◽  
Holocene Climate ◽  
Nordic Seas ◽  
The Holocene ◽  
Holocene Thermal Maximum ◽  
Thermal Maximum ◽  
The Impact

Abstract. The relatively warm early Holocene climate in the Nordic Seas, known as the Holocene thermal maximum (HTM), is often associated with an orbitally forced summer insolation maximum at 10 ka BP. The spatial and temporal response recorded in proxy data in the North Atlantic and the Nordic Seas reveals a complex interaction of mechanisms active in the HTM. Previous studies have investigated the impact of the Laurentide Ice Sheet (LIS), as a remnant from the previous glacial period, altering climate conditions with a continuous supply of melt water to the Labrador Sea and adjacent seas and with a downwind cooling effect from the remnant LIS. In our present work we extend this approach by investigating the impact of the Greenland Ice Sheet (GIS) on the early Holocene climate and the HTM. Reconstructions suggest melt rates of 13 mSv for 9 ka BP, which result in our model in an ocean surface cooling of up to 2 K near Greenland. Reconstructed summer SST gradients agree best with our simulation including GIS melt, confirming that the impact of the early Holocene GIS is crucial for understanding the HTM characteristics in the Nordic Seas area. This implies that modern and near-future GIS melt can be expected to play an active role in the climate system in the centuries to come.

scholarly journals Stepwise Weakening of Aeolian Activities During the Holocene in the Gannan Region, Eastern Tibetan Plateau

2021 ◽  
Vol 9 ◽  
Author(s):  
Shengli Yang ◽  
Xiaojing Liu ◽  
Ting Cheng ◽  
Yuanlong Luo ◽  
Qiong Li ◽  
...  
Keyword(s):  
Tibetan Plateau ◽  
Environmental Changes ◽  
Climatic Changes ◽  
Early Holocene ◽  
Eastern Tibetan Plateau ◽  
Aeolian Desertification ◽  
The Holocene ◽  
Aeolian Sediments ◽  
Aeolian Activity ◽  
History Of

Aeolian sediments hold key information on aeolian history and past environmental changes. Aeolian desertification and extensive land degradation have seriously affected the eco-environment in the Gannan region on the eastern Tibetan Plateau. Understanding the history of aeolian activities can deepen our understanding of the impacts of climatic changes on aeolian activities in the future. This study uses a detailed chronology and multiple proxy analyses of a typical aeolian section in Maqu to reconstruct aeolian activities in the region during the Holocene. Our results showed that aeolian activities have occurred in the eastern Tibetan Plateau since the early Holocene. Magnetic susceptibility, grain size records, and paleosols formation indicated a trend of stepwise weakening in aeolian activities from the early Holocene to the present. The weakening of aeolian activities was divided into three stages: ∼10.0–8.0 ka BP, ∼8.0–4.0 ka BP, and ∼4.0 ka BP to the present. Paleosols were primarily formed after ∼8.0 ka BP, and episodically interrupted aeolian activities processes in the Gannan region. Aeolian activity may increase in the Gannan region as the climate gradually warms. Climatic changes and local hydrological conditions have jointly affected the history of aeolian activities in this region.

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