北方生态系统生产力因罗斯比波驱动的干热条件而降低，这一成果由哥伦比亚大学Gentine, Pierre团队经过不懈努力而取得。该项研究成果发表在2025年6月16日出版的《自然—地球科学》上。

以植被光合作用的卫星代理为主题，课题组研究人员评估了罗斯比波7事件的影响，在此期间，急流呈现7个波峰和波谷，并倾向于产生长时间的天气异常。结果表明，在夏季rosby -7波事件期间，中纬度北部温暖岩心的植被生产力有组织地下降，而寒冷岩心的植被生产力则有组织地增强。由于暴露于复合干热（或冷湿）极端环境的增加以及对复合压力源的非线性生理反应，温暖岩心内的中纬度生物群落对水分限制更加敏感。在分析的温暖核心中，由于极端干热，波浪事件将西欧、西亚和美国西部的生产力下降的气候风险分别提高了8.3、6.2和4.0倍。特别是，在中等排放情景下，32-44%的温暖异常和52-88%的干燥异常处于最先进的气候模式预测的2081-2100年更温暖-更干燥的条件范围内。因此，观测到的罗斯比波驱动的影响提供了一个迹象，表明未来更温暖、更干燥的气候如何降低北半球生态系统的碳吸收能力。

据了解，对流层急流中的大尺度准静止罗斯比波有利于其在空间上复合北半球的干热冷湿天气。然而，这种环全球环流模式如何影响北半球生态系统生产力仍未得到探索。

Title: Northern ecosystem productivity reduced by Rossby-wave-driven hot–dry conditions

Author: Lian, Xu, Li, Yangmingkai, Liu, Jiangong, Kornhuber, Kai, Gentine, Pierre

Issue&Volume: 2025-06-16

Abstract: Large-scale quasi-stationary Rossby waves in the tropospheric jet stream favour spatially compounding hot–dry and cold–wet weather across the northern hemisphere. However, how this circumglobal circulation pattern affects northern hemisphere ecosystem productivity remains unexplored. Here, using satellite proxies of vegetation photosynthesis, we assess the impact of Rossby wave-7 events during which the jet stream exhibits seven peaks and troughs and tends to produce prolonged weather anomalies. Our results show organized declines in vegetation productivity in warm cores and enhancement in cold cores at northern mid-latitudes during summer Rossby wave-7 events. Mid-latitude biomes within warm cores become much more susceptible to water limitations, resulting from an increased exposure to compound hot–dry (or cold–wet) extremes and a nonlinear physiological response to compound stressors. Of the warm cores analysed, wave events elevate the climatic risk of productivity declines by a factor of 8.3, 6.2 and 4.0 over western Europe, western Asia and the western United States, respectively, due to hot–dry extremes. In particular, 32–44% of the warm anomalies and 52–88% of the dry anomalies fall within the range of warmer–drier conditions projected for 2081–2100 by state-of-the-art climate models under a medium emissions scenario. Therefore, the observed Rossby-wave-driven impacts provide an indication of how a warmer–drier future climate could reduce the carbon uptake capacity of northern hemisphere ecosystems.

DOI: 10.1038/s41561-025-01722-3

Source: https://www.nature.com/articles/s41561-025-01722-3