Response of Lake Baikal ecosystem to climate forcing and pCO2 change over the last glacial/interglacial transition
Response of Lake Baikal ecosystem to climate forcing and pCO2 change over the last glacial/interglacial transition
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DOI：
10.1016/s0012-821x(99)00203-4
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发表时间：
1999-10
影响因子：
5.3
通讯作者：
A. Prokopenko;Douglas F. Williams;E. Karabanov;G. Khursevich
中科院分区：
文献类型：
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作者：
A. Prokopenko;Douglas F. Williams;E. Karabanov;G. Khursevich
贝加尔湖岩心BDP-93-2末次冰期/间冰期总有机碳的δ13C记录与大气co2波动和3.5‰~ 4‰的负同位素位移具有显著的相关性，以响应全球古pco2水平的升高。然而，随着贝加尔湖碳循环从全冰期模式到全间冰期模式的快速演化，贝加尔湖δ13C沉积有机质中的pco2信号在全新世被全盆地生产力信号淹没。贝加尔湖硅藻丰度记录比GISP2冰芯δ18O温度记录滞后约1 ka，可能反映了贝加尔湖生态系统对重大气候变化的响应时间。然而，新仙女木期的明显降温并没有滞后，这表明亚洲大陆内部的这一突发气候事件有不同的强迫机制，反应时间较短。贝加尔湖岩心BDP-93-2中硅藻丰度与δ13C代用物的相位差表明它们对不同强迫机制的独立响应，进一步证明了它们在贝加尔湖记录古气候重建中的重要性。
The δ13C record of total organic carbon in the Lake Baikal core BDP-93-2 over the last glacial/interglacial transition shows remarkable correlation with atmospheric CO2fluctuations and the negative isotopic shift of 3.5–4‰ in response to the global increase in paleo-pCO2level. With rapid evolution of the Lake Baikal carbon cycle from full glacial to full interglacial modes, however, the pCO2signal in the Baikal δ13C sedimentary organic matter is inundated by the basin-wide productivity signal, in the Holocene. The Baikal diatom abundance record, as a paleotemperature proxy, lags behind the GISP2 ice core δ18O temperature proxy record by ca. 1 ka, possibly reflecting the response time of the Baikal ecosystem to major climatic transitions. There is no lag associated with the pronounced Younger Dryas cooling, however, suggesting a different forcing mechanism, with a short response time, for this abrupt climatic event in continental interior Asia. The phase difference observed between the diatom abundance and δ13C proxies in Lake Baikal core BDP-93-2 suggests their independent responses to different forcing mechanisms, further justifying their importance for paleoclimate reconstructions from Lake Baikal records.