更新世冰盖与大洋碳储库相互作用的箱式模型模拟

马文涛; 田军; 李前裕

doi:10.3799/dqkx.2011.064

Volume 36 Issue 4

Jul. 2011

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Article Navigation > Earth Science > 2011 > 36(4): 621-634

MA Wen-tao, TIAN Jun, LI Qian-yu, 2011. Interaction between Ice Sheet and Oceanic Carbon Cycling during the Pleistocene: A Box Model Simulation. Earth Science, 36(4): 621-634. doi: 10.3799/dqkx.2011.064

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MA Wen-tao, TIAN Jun, LI Qian-yu, 2011. Interaction between Ice Sheet and Oceanic Carbon Cycling during the Pleistocene: A Box Model Simulation. Earth Science, 36(4): 621-634. doi: 10.3799/dqkx.2011.064

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Interaction between Ice Sheet and Oceanic Carbon Cycling during the Pleistocene: A Box Model Simulation

doi: 10.3799/dqkx.2011.064

MA Wen-tao^1
,,
TIAN Jun¹,
LI Qian-yu^{1, 2}

1.
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
2.
School of Earth and Environment Science, University of Adelaide, Adelaide SA5005, Australia

Received Date: 2011-02-11
Publish Date: 2011-07-01

Abstract

Abstract

The widely discovered 400-kyr cycles of foraminiferal carbon isotopes (δ¹³C) from world oceans are interpreted to be linked to the forcing of Earth's eccentricity around the Sun. During the past 1.6 million years (Ma), however, this period extended to 500-kyr and the δ¹³C maxima of the carbon cycle didn't correspond to the eccentricity's minima. The origin of the 400-kyr cycle and the mechanism for its obscuring during the Pleistocene are elusive. Here we develop a 9-box biogeochemical model on the purpose of understanding interactions between tropical process and variability of ice sheet and their influences on oceanic carbon cycle. The simulated results show that deglaciation is concurrent with the appearance of sea ice in the northern high latitude; while when the northern high latitude is free of sea ice, the ice sheet begins to build up. The simulated building of ice sheet is slower than its retreat, thus the variability of ice sheet is asymmetric. The model can simulate asymmetric 100-kyr cycle of ice sheet under only seasonal solar insolation rather than Milankovitch forcing. By adding the summer insolation of northern high latitude into the ablation term of the ice sheet, precession components become stronger in simulated results. The onset of deglaciation is nonlinearly phase locked to the summer insolation forcing, which leads to a good comparison with geological record. The simulated concentration of atmospheric CO₂ is becoming higher during deglaciation owing to the insulation effect of sea ice and is becoming lower during the decrease of ocean circulation. If the model is forced by only tropical weathering process but without the variability of ice sheet, simulated δ¹³C results exhibit strong 400-kyr cycles indicating a significant response of ocean carbon reservoir to tropical forcing. If the model is forced by both the variability of weathering and ice sheet, however, simulated δ¹³C results show weaker 400-kyr but stronger 100-kyr cycles and the phase difference between the simulated δ¹³C and the eccentricity at the 400-kyr band is also different from that in the simulation forced by only weathering process. Our model results seem to indicate that when ice sheet is introduced into the earth system it will result in oceanic circulation reorganization which can suppress the signal of tropical process in ocean carbon reservoir.
- box model,
- carbon cycle,
- tropical process,
- long eccentricity period,
- paleoclimate,
- marine geology

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References(35)

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