ENSO and Paraná flow variability: Long‐term changes in their connectivity

ENSO and Paraná flow variability: Long‐term changes in their connectivity
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ENSO 和帕拉尼亚流变化:其连通性的长期变化

DOI:
10.1002/joc.7643
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发表时间:
2022
期刊:
International Journal of Climatology
影响因子:
--
通讯作者:
Vuille, Mathias
Vuille, Mathias
中科院分区:
--
文献类型:
--
作者:
Antico, Andrés;Vuille, Mathias

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南美洲的巴拉那河是世界上最大的河流之一。虽然之前已经研究了巴拉那河流量和厄尔尼诺-南方涛动(ENSO)之间的联系,但对这种联系的长期(年代际)变化知之甚少。在这里,我们揭示了这些变化,通过分析长期仪器记录的巴拉那流,ENSO指数和其他气候变量。我们发现,流量和ENSO在1876-1940年和1983-2016年是连接的,但在1941-1982年断开。流量变率在1876-1940年与中太平洋ENSO波动的关系更密切,但在1983-2016年与东太平洋ENSO波动的关系更密切,这可能是因为ENSO-Paraná海盆遥相关在两个时期不同。与ENSO相关的太平洋气候异常在1941-1982年的分离期表现出最小的振幅,这表明ENSO-气流联系在ENSO较弱时消失。我们还发现,ENSO流动的断开与研究期间的年代际太平洋涛动(IPO)的最冷相一致。因此,IPO可能正在调节ENSO流的连通性。有趣的是,在断开年(1941年至1982年),流量与南大西洋南部和热带北大西洋海洋的部门观察到的气候变率。这和其他的经验结果提供了新的见解巴拉那响应ENSO,从而提供了有价值的信息,为未来的机制研究,这种响应。
The Paraná River of South America is one of the largest rivers in the world. Although the connection between Paraná streamflow and El Niño–Southern Oscillation (ENSO) has been studied before, little is known about the longterm (interdecadal) changes of this connectivity. Here we reveal these changes by analysing long instrumental records of Paraná flow, ENSO indices and other climate variables. We find that flow and ENSO were connected in 1876–1940 and 1983–2016, but disconnected in 1941–1982. Flow variability was more related to central Pacific ENSO fluctuations in 1876–1940 but more linked with eastern Pacific ones in 1983–2016, probably because the ENSO–Paraná basin teleconnection was different in the two periods. ENSO-related Pacific climate anomalies exhibited their smallest amplitudes during the disconnection period 1941–1982, suggesting that the ENSO–flow link vanishes when ENSO is weak. We also find that the ENSO–flow disconnection coincided with the coldest phase of the Interdecadal Pacific Oscillation (IPO) in the study period. Thus, the IPO may be modulating the ENSO–flow connectivity. Interestingly, during the disconnection years (1941–1982), flow was related to climate variability observed in sectors of the southern South Atlantic and tropical North Atlantic oceans. This and the other empirical results presented here provide new insights into the Paraná response to ENSO and thus provide valuable information for future mechanistic studies on this response.
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