Reconciling ice core CO2 and land-use change following New World-Old World contact.
Reconciling ice core CO2 and land-use change following New World-Old World contact.
复制标题
协调新世界与旧世界接触后冰芯二氧化碳和土地利用变化。
DOI:
10.1038/s41467-024-45894-9
复制
发表时间:
2024
影响因子:
16.6
通讯作者:
King ACF
中科院分区:
文献类型:
--
作者:
King ACF
Ice core records of carbon dioxide (CO2) throughout the last 2000 years provide context for the unprecedented anthropogenic rise in atmospheric CO2and insights into global carbon cycle dynamics. Yet the atmospheric history of CO2remains uncertain in some time intervals. Here we present measurements of CO2and methane (CH4) in the Skytrain ice core from 1450 to 1700 CE. Results suggest a sudden decrease in CO2around 1610 CE in one widely used record may be an artefact of a small number of anomalously low values. Our analysis supports a more gradual decrease in CO2of 0.5 ppm per decade from 1516 to 1670 CE, with an inferred land carbon sink of 2.6 PgC per decade. This corroborates modelled scenarios of large-scale reorganisation of land use in the Americas following New World-Old World contact, whereas a rapid decrease in CO2at 1610 CE is incompatible with even the most extreme land-use change scenarios.