What caused the atmosphere's CO2 content to rise during the last 8000 years?
What caused the atmosphere's CO2 content to rise during the last 8000 years?
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DOI：
10.1029/2001gc000177
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发表时间：
2001-10
期刊：
影响因子：
3.7
通讯作者：
W. Broecker;J. Lynch‐Stieglitz;E. Clark;I. Hajdas;G. Bonani
中科院分区：
文献类型：
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作者：
W. Broecker;J. Lynch‐Stieglitz;E. Clark;I. Hajdas;G. Bonani
我们认为，过去8000年大气二氧化碳含量增加20 ppm至少部分是由于当前间冰期早期陆地生物量增加500 Gt C的结果，而不是由于陆地生物量减少200 Gt C的结果。Indermühle等人提出的全新世。[1999]。为了支持这一说法，我们提出了新的13 C测量从Ontong Java高原盒芯，这并不重现从泰勒圆顶冰芯的CO2测量推断的趋势。在试图区分的情况下提出的占晚全新世大气中CO2含量的上升，我们还进行了有孔虫壳重量测量的三个箱芯从翁通爪哇高原。我们惊讶地发现，我们所寻求的全新世早期碳酸钙保存事件是强烈的深度依赖。最大的震级是在4公里处，那里的CO 3 =离子浓度似乎比今天的高30 μmol/kg，因此几乎与今天的北大西洋深水一样高。
We make a case that the 20 ppm rise in atmospheric CO2 content over the last 8000 years was at least in part a consequence of the 500 Gt C increase in terrestrial biomass early in the present interglacial rather than of a 200 Gt C decrease in terrestrial biomass during the latter part of the Holocene as proposed by Indermühle et al. [1999]. In support of this claim, we present new 13C measurements from an Ontong Java Plateau box core, which do not reproduce the trend deduced from measurements on CO2 from the Taylor Dome ice core. In attempt to distinguish between scenarios put forth to accounting for the late Holocene rise in atmospheric CO2 content, we also made foraminifera shell weight measurements on three box cores from the Ontong Java Plateau. We were surprised to find that the early Holocene CaCO3 preservation event we sought was strongly depth dependent. The largest magnitude was at 4 km where CO3= ion concentrations appear to have been 30 μmol/kg higher than today's and hence nearly as high as those in today's North Atlantic Deep Water.