Shi Wenqing, Qin Boqiang, Zhang Qingji, Paerl Hans W, Van Dam Bryce, Jeppesen Erik, Zeng Chenjun
Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technologies, Jiangsu Key Laboratory of Atmospheric Environmental Monitoring & Pollution Control, School of Environmental Science & Engineering, Nanjing University of Information Science & Technology, Nanjing, 210044, China.
Taihu Laboratory for Lake Ecosystem Research, State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
Nat Commun. 2024 Dec 4;15(1):10572. doi: 10.1038/s41467-024-54926-3.
In lakes, phytoplankton sequester atmospheric carbon dioxide (CO) and store it in the form of biomass organic carbon (OC); however, only a small fraction of the OC remains buried, while the remaining part is recycled to the atmosphere as CO and methane (CH). This has the potential effect of adding CO-equivalents (CO-eq) to the atmosphere and producing a warming effect due to the higher radiative forcing of CH relative to CO. Here we show a 3.1-fold increase in CO-eq emissions over a 100-year horizon, with the effect increasing with global warming intensity. Climate warming has stimulated phytoplankton growth in many lakes worldwide, which, in turn, can feed back CO-eq and create a positive feedback loop between them. In lakes where phytoplankton is negatively impacted by climate warming, the CO-eq feedback capacity may diminish gradually with the ongoing climate warming.
在湖泊中，浮游植物会吸收大气中的二氧化碳（CO₂），并以生物量有机碳（OC）的形式储存起来；然而，只有一小部分有机碳会被埋藏，其余部分则会以二氧化碳和甲烷（CH₄）的形式再循环到大气中。这有可能向大气中添加二氧化碳当量（CO₂-eq），并由于甲烷相对于二氧化碳具有更高的辐射强迫而产生变暖效应。在此我们表明，在100年的时间范围内，二氧化碳当量排放量增加了3.1倍，且这种效应会随着全球变暖强度的增加而增强。气候变暖刺激了全球许多湖泊中浮游植物的生长，反过来，这又会反馈二氧化碳当量，并在它们之间形成一个正反馈循环。在浮游植物受到气候变暖负面影响的湖泊中，随着气候持续变暖，二氧化碳当量的反馈能力可能会逐渐减弱。
