2020年长江流域极端降水引起的陆地碳汇损失与恢复

IF 6.3 1区地球科学 Q1 ENGINEERING, CIVIL

Journal of Hydrology Pub Date : 2025-10-12 DOI:10.1016/j.jhydrol.2025.134390

Zishan Wang , Jun Wang , Hao Zhou , Qixiang Cai , Ran Yan , Hongzhao Wang , Zhi Huang , Meirong Wang , Weimin Ju

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引用次数: 0

摘要

全球气候变化背景下的极端降水对陆地固碳产生了巨大影响。虽然广泛的研究集中在干旱对陆地碳汇的不利影响上，但极端降水事件的影响仍未得到充分探讨。利用OCO-2 v10 MIP后测数据和两个陆地生物圈模式（VEGAS和LPJwsl）的模拟，研究了2020年6 - 7月长江流域（YRV）创纪录强降水事件引起的碳汇动态。结果表明，JJ极端降水导致净生物群落生产力（NBP）显著下降，OCO-2 v10 MIP减少了约- 16.75 Tg C， VEGAS减少了- 23.50 Tg C， LPJwsl减少了- 16.88 Tg C，主要是由于初级生产总量（GPP）的大幅下降。8月降水停止后，由于总生态系统呼吸（TER*）增强，NBP负异常持续存在，但在GPP回升的推动下，NBP负异常快速恢复，恢复率分别为55.40%、83.58%和86.85%。极端降水还引发了温度、土壤湿度、地表向下太阳辐射（RAD）和水汽压亏缺（VPD）的显著变化，所有这些都影响了NBP。归因分析显示，减少的RAD是JJ期间NBP负异常的主要因素，VEGAS和lpjws1的贡献分别约为- 19.36 Tg C和- 8.54 Tg C。今年8月，VEGAS强调了JJ的负面遗留影响，而LPJwsl则指出了高温的抑制作用。此外，这两个模型一致强调了RAD在碳汇恢复中的关键作用。考虑到全球变暖背景下强降水频率和强度的增加，本研究强调了极端降水对陆地固碳的负面影响，为进一步认识极端气候事件与陆地生态系统的相互作用提供了依据。

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Loss and recovery of terrestrial carbon sinks induced by 2020 extreme precipitation in the Yangtze River Valley

Extreme precipitation within the context of global climate change has dramatic impacts on terrestrial carbon sequestration. While extensive research has focused on the adverse impacts of droughts on terrestrial carbon sinks, the effects of extreme precipitation events remain underexplored. Here we investigated the carbon sink dynamics induced by a record-breaking heavy precipitation event over the Yangtze River Valley (YRV) in June-July (JJ) 2020, using OCO-2 v10 MIP posterior data and simulations from two terrestrial biosphere models (VEGAS and LPJwsl). Our results show that extreme precipitation in JJ caused a significant decline in net biome productivity (NBP), with reductions of approximately − 16.75 Tg C by OCO-2 v10 MIP, −23.50 Tg C by VEGAS, and − 16.88 Tg C by LPJwsl, predominantly driven by substantial decreases in gross primary production (GPP). Following the cessation of precipitation in August, negative NBP anomalies persisted due to stronger total ecosystem respiration (TER*), but rapid recovery was observed, with recovery rates of 55.40 %, 83.58 %, and 86.85 %, respectively, driven by a resurgence in GPP. Extreme precipitation also triggered significant variations in temperature, soil moisture, surface downward solar radiation (RAD), and vapor pressure deficit (VPD), all of which influenced NBP. Attribution analysis revealed reduced RAD as the primary factor behind negative NBP anomalies during JJ, with contributions of approximately − 19.36 Tg C in VEGAS and − 8.54 Tg C in LPJwsl. In August, VEGAS emphasized negative legacy effects from JJ, while LPJwsl pointed to the suppressive role of high temperatures. Furthermore, both models consistently underscored the pivotal role of RAD in carbon sink recovery. Considering the increasing frequency and intensity of heavy precipitation under global warming, our study emphasized the negative effects of extreme precipitation on the terrestrial carbon sequestration, providing the further understanding on interactions of extreme climatic events and terrestrial ecosystems.

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来源期刊

Journal of Hydrology 地学-地球科学综合

CiteScore

11.00

自引率

12.50%

发文量

1309

审稿时长

7.5 months

期刊介绍： The Journal of Hydrology publishes original research papers and comprehensive reviews in all the subfields of the hydrological sciences including water based management and policy issues that impact on economics and society. These comprise, but are not limited to the physical, chemical, biogeochemical, stochastic and systems aspects of surface and groundwater hydrology, hydrometeorology and hydrogeology. Relevant topics incorporating the insights and methodologies of disciplines such as climatology, water resource systems, hydraulics, agrohydrology, geomorphology, soil science, instrumentation and remote sensing, civil and environmental engineering are included. Social science perspectives on hydrological problems such as resource and ecological economics, environmental sociology, psychology and behavioural science, management and policy analysis are also invited. Multi-and interdisciplinary analyses of hydrological problems are within scope. The science published in the Journal of Hydrology is relevant to catchment scales rather than exclusively to a local scale or site.