Carbon cycling and climate change during the last glacial cycle inferred from the isotope records using an ocean biogeochemical carbon cycle model

2003 ◽  
Vol 35 (1-2) ◽  
pp. 131-141 ◽  
Author(s):  
Takashi Ikeda ◽  
Eiichi Tajika
Keyword(s):  
Climate Change ◽  
Carbon Cycle ◽  
Carbon Cycling ◽  
Glacial Cycle ◽  
Cycle Model ◽  
Carbon Cycle Model ◽  
Last Glacial ◽  
The Last Glacial

scholarly journals Global response of the terrestrial biosphere to CO2and climate change using a coupled climate-carbon cycle model

2002 ◽  
Vol 16 (4) ◽  
pp. 31-1-31-15 ◽  
Author(s):  
M. Berthelot ◽  
P. Friedlingstein ◽  
P. Ciais ◽  
P. Monfray ◽  
J. L. Dufresne ◽  
...  
Keyword(s):  
Climate Change ◽  
Carbon Cycle ◽  
Cycle Model ◽  
Terrestrial Biosphere ◽  
Global Response ◽  
Carbon Cycle Model

scholarly journals Glacial CO<sub>2</sub> cycle as a succession of key physical and biogeochemical processes

2011 ◽  
Vol 7 (3) ◽  
pp. 1767-1795 ◽  
Author(s):  
V. Brovkin ◽  
A. Ganopolski ◽  
D. Archer ◽  
G. Munhoven
Keyword(s):  
Radiative Forcing ◽  
Marine Biology ◽  
Deep Ocean ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
Glacial Cycle ◽  
Minimum Concentration ◽  
Carbon Cycle Model ◽  
Last Glacial ◽  
The Last Glacial

Abstract. During glacial-interglacial cycles, atmospheric CO2 concentration varied by about 100 ppmv in amplitude. While testing mechanisms that had led to the low glacial CO2 level could be done in equilibrium model experiments, an ultimate goal is to explain CO2 changes in transient simulations through the complete glacial-interglacial cycle. A computationally efficient Earth System model of intermediate complexity CLIMBER-2 is used to simulate global biogeochemistry over the last glacial cycle (126 kyr). The physical core of the model (atmosphere, ocean, land and ice sheets) is driven by orbital changes and reconstructed radiative forcing from greenhouses gases, ice, and aeolian dust. The carbon cycle model is able to reproduce the main features of the CO2 changes: a 50 ppmv CO2 drop during glacial inception, a minimum concentration at the last glacial maximum by 80 ppmv lower than the Holocene value, and an abrupt 60 ppmv CO2 rise during the deglaciation. The model deep ocean δ13C also resembles reconstructions from deep-sea cores. The main drivers of atmospheric CO2 evolve with time: changes in sea surface temperatures and in the volume of bottom water of southern origin controls atmospheric CO2 during the glacial inception and deglaciation, while changes in carbonate chemistry and marine biology are dominant during the first and second parts of the glacial cycle, respectively. These feedback mechanisms could also significantly impact the ultimate climate response to the anthropogenic perturbation.

Variations in terrigenous dilution in western Mediterranean Sea pelagic sediments in response to climate change during the last glacial cycle

2004 ◽  
Vol 211 (1-2) ◽  
pp. 21-43 ◽  
Author(s):  
B.A.A. Hoogakker ◽  
R.G. Rothwell ◽  
E.J. Rohling ◽  
M. Paterne ◽  
D.A.V. Stow ◽  
...  
Keyword(s):  
Climate Change ◽  
Mediterranean Sea ◽  
Western Mediterranean ◽  
Glacial Cycle ◽  
Last Glacial ◽  
Western Mediterranean Sea ◽  
The Last Glacial

Changes in biogeochemistry recorded in the Lisan formation and the Dead Sea Basin

2020 ◽  
Author(s):  
Alexandra Turchyn ◽  
Harold Bradbury ◽  
Adi Torfstein
Keyword(s):  
Climate Change ◽  
Isotopic Composition ◽  
Hydrological Cycle ◽  
Dead Sea ◽  
Glacial Cycle ◽  
Last Glacial ◽  
The Dead ◽  
Lisan Formation ◽  
The Last Glacial ◽  
Arava Valley

&lt;p&gt;Terrestrial climate archives provide a rich array of information on regional climate dynamics that often can link to global climate change.&amp;#160; A range of new metal and coupled isotope proxies is helping to unlock the most information from terrestrial archives and this paleoclimate information. The Jordon-Arava valley, tectonically active since the early Neogene, is one of the world&amp;#8217;s largest pull-apart basins.&amp;#160; Throughout the Pleistocene to the Holocene, the valley contained a series of lacustrine water bodies. &amp;#160;As the valley is located on the boundary between the African-Arabian deserts and the Mediterranean regional climatic zone, studies of past conditions in these lacustrine bodies allows the reconstruction of changes in the regional hydrological cycle.&amp;#160; Lacustrine sediments, such as those found in the Jordon-Arava valley, record paleoclimatic information similar to that found within marine sedimentary archives and often at much higher resolution, from millennial to even annual timescales. The Lisan Formation is a 40-80m thick Pleistocene marl, which was deposited in Lake Lisan, which existed over the last glacial cycle in the Jordan-Arava Valley. The Lisan Formation contains a significant quantity of annually-precipitated primary aragonite, which has not recrystallised to calcite, allowing for direct U-Th dating, which has led to an exceptional age model for the Lisan Formation.&lt;/p&gt;&lt;p&gt;Here we discuss the measurement of the sulfur and oxygen isotopic composition of gypsum in the Lisan formation, as well as the generation of sulfur nodules within the formation that are not found in the sediment cores of the Dead Sea. We use this data to explore how sediment diagenesis, relating to changes in biogeochemistry, changes as a function of climate change over the last glacial cycle. We then present the calcium isotopic composition of the gypsum and interbedded aragonite, and show how the aragonite calcium isotopic composition covaries with lake level, and thus offers profound insight into the regional hydrological cycle in the Jordon-Arava Valley.&lt;/p&gt;

scholarly journals Northern Iberian abrupt climate change dynamics during the last glacial cycle: A view from lacustrine sediments

2012 ◽  
Vol 36 ◽  
pp. 139-153 ◽  
Author(s):  
Ana Moreno ◽  
Penélope González-Sampériz ◽  
Mario Morellón ◽  
Blas L. Valero-Garcés ◽  
William J. Fletcher
Keyword(s):  
Climate Change ◽  
Lacustrine Sediments ◽  
Abrupt Climate Change ◽  
Glacial Cycle ◽  
Last Glacial ◽  
Change Dynamics ◽  
The Last Glacial

scholarly journals Glacial CO<sub>2</sub> cycle as a succession of key physical and biogeochemical processes

2012 ◽  
Vol 8 (1) ◽  
pp. 251-264 ◽  
Author(s):  
V. Brovkin ◽  
A. Ganopolski ◽  
D. Archer ◽  
G. Munhoven
Keyword(s):  
Radiative Forcing ◽  
Marine Biology ◽  
Deep Ocean ◽  
Co2 Concentration ◽  
Atmospheric Co2 ◽  
Glacial Cycle ◽  
Minimum Concentration ◽  
Carbon Cycle Model ◽  
Last Glacial ◽  
The Last Glacial

Abstract. During glacial-interglacial cycles, atmospheric CO2 concentration varied by about 100 ppmv in amplitude. While testing mechanisms that have led to the low glacial CO2 level could be done in equilibrium model experiments, an ultimate goal is to explain CO2 changes in transient simulations through the complete glacial-interglacial cycle. The computationally efficient Earth System model of intermediate complexity CLIMBER-2 is used to simulate global biogeochemistry over the last glacial cycle (126 kyr). The physical core of the model (atmosphere, ocean, land and ice sheets) is driven by orbital changes and reconstructed radiative forcing from greenhouses gases, ice, and aeolian dust. The carbon cycle model is able to reproduce the main features of the CO2 changes: a 50 ppmv CO2 drop during glacial inception, a minimum concentration at the last glacial maximum 80 ppmv lower than the Holocene value, and an abrupt 60 ppmv CO2 rise during the deglaciation. The model deep ocean δ13C also resembles reconstructions from deep-sea cores. The main drivers of atmospheric CO2 evolve in time: changes in sea surface temperatures and in the volume of bottom water of southern origin control atmospheric CO2 during the glacial inception and deglaciation; changes in carbonate chemistry and marine biology are dominant during the first and second parts of the glacial cycle, respectively. These feedback mechanisms could also significantly impact the ultimate climate response to the anthropogenic perturbation.

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