Increased Variability of Thailand's Chao Phraya River Peak Season Flow and Its Association With ENSO Variability: Evidence From Tree Ring δ<sup>18</sup>O

Xu, Chenxi; Buckley, Brendan M.; Promchote, Parichart; Wang, S.‐Y. Simon; Pumijumnong, Nathsuda; An, Wenling; Sano, Masaki; Nakatsuka, Takeshi; Guo, Zhengtang

doi:10.1029/2018gl081458

Cited by 33 publications

(22 citation statements)

References 60 publications

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“…Tree ring cellulose from Thailand 81 , Laos 5 , Cambodia 83 and Vietnam 4 shows a clear link between and ENSO, with El Niño events leading to higher and La Niña to lower values. This relation can be enhanced or reduced by modulations of Indian Ocean SSTs 35 , 82 . In addition, positive anomalies during June to September in rainfall from Laos have been linked to more proximal moisture sources from the Bay of Bengal 35 .…”

Section: Resultsmentioning

confidence: 99%

“…(1234567890) Scientific RepoRtS | (2020) 10:16482 | https://doi.org/10.1038/s41598-020-73508-z www.nature.com/scientificreports/ leading to higher δ 18 O and La Niña to lower δ 18 O values. This relation can be enhanced or reduced by modulations of Indian Ocean SSTs 35,82 . In addition, positive δ 18 O anomalies during June to September in rainfall from Laos have been linked to more proximal moisture sources from the Bay of Bengal 35 .…”

Section: Spatial Variability Of δ 18mentioning

confidence: 99%

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Rainwater isotopes in central Vietnam controlled by two oceanic moisture sources and rainout effects

Wolf

Roberts

Ersek

et al. 2020

Sci Rep

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The interpretation of palaeoclimate archives based on oxygen isotopes depends critically on a detailed understanding of processes controlling the isotopic composition of precipitation. In the summer monsoonal realm, like Southeast Asia, seasonally and interannually depleted oxygen isotope ratios in precipitation have been linked to the summer monsoon strength. However, in some regions, such as central Vietnam, the majority of precipitation falls outside the summer monsoon period. We investigate processes controlling stable isotopes in precipitation from central Vietnam by combining moisture uptake calculations with monthly stable isotope data observed over five years. We find that the isotopic seasonal cycle in this region is driven by a shift in moisture source from the Indian Ocean to the South China Sea. This shift is reflected in oxygen isotope ratios with low values (− 8 to − 10‰) during summer and high values during spring/winter (0 to − 3‰), while 70% of the annual rainfall occurs during autumn. Interannual changes in precipitation isotopes in central Vietnam are governed by the timing of the seasonal onset and withdrawal of the Intertropical Convergence Zone, which controls the amount of vapour contributed from each source.

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Section: Resultsmentioning

confidence: 99%

Section: Spatial Variability Of δ 18mentioning

confidence: 99%

Rainwater isotopes in central Vietnam controlled by two oceanic moisture sources and rainout effects

Wolf

Roberts

Ersek

et al. 2020

Sci Rep

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“…The PDO has been shown to influence hydroclimatic variability in Monsoon Asia, in conjunction with ENSO (Yu et al, 2018). Specifically for the Chao Phraya, PDO also modulates ENSO's influence on peak flow (Xu et al, 2019). Here, by juxtaposing the correlation maps, our analyses reveal that ENSO and PDV exert their greatest influence on the Mekong and Chao Phraya.…”

Section: Pacific Oceanmentioning

confidence: 62%

“…We acknowledge that the instrumental data may contain anthropogenic effects such as those caused by reservoir operations. This is a common issue in streamflow reconstruction (Xu et al, 2019). Working with annual rather than seasonal streamflow ameliorates the effects of upstream reservoirs, which transfer water from wet season to dry season but have less impact on the annual water budget.…”

Section: Streamflow and Proxy Datamentioning

confidence: 99%

Coherent streamflow variability in Monsoon Asia over the past eight centuries---links to oceanic drivers

Nguyen,

Turner,

Buckley

et al. 2019

Preprint

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Climate-informed dynamic streamflow reconstruction is skillful over most of Monsoon Asia • Spatial coherence of streamflow suggests water management be coordinated among basins • Mekong and Chao Phraya are most sensitive among rivers to anomalies in sea surface temperature AbstractThe Monsoon Asia region is home to ten of the world's biggest rivers, supporting the lives of 1.7 billion people who rely on streamflow for water, energy, and food. Yet, a synoptic understanding of multi-centennial streamflow variability for this region is lacking. Here we produce the first large scale streamflow reconstruction over Monsoon Asia (63 stations in 16 countries), using a novel climate-informed dynamic algorithm that is skillful over 92% of the gauging stations. We show that streamflow in Monsoon Asia is spatially coherent, owing to common drivers from the Pacific, Indian, and Atlantic Oceans that exert their greatest influence over the Mekong and Chao Phraya basins. This work increases our understanding of streamflow variability over Monsoon Asia. We suggest that future water management in the region should be coordinated between basins, taking into account the states of the oceans. * This manuscript is undergoing revision; it may be updated in a near future.

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“…The PDV has been shown to influence hydroclimatic variability in Monsoon Asia, in conjunction with ENSO (Yu et al., 2018). Specifically for the Chao Phraya, PDV also modulates ENSO's influence on peak flow (Xu et al., 2019).…”

Section: Resultsmentioning

confidence: 99%

Coherent Streamflow Variability in Monsoon Asia Over the Past Eight Centuries—Links to Oceanic Drivers

Nguyen

Turner

Buckley

et al. 2020

Water Resources Research

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The Monsoon Asia region is home to ten of the world's biggest rivers, supporting the lives of 1.7 billion people who rely on streamflow for water, energy, and food. Yet a synthesized understanding of multicentennial streamflow variability for this region is lacking. To fill this gap, we produce the first large scale streamflow reconstruction over Monsoon Asia (62 stations in 16 countries, 813 years of mean annual flow). In making this reconstruction, we develop a novel, automated, climate-informed, and dynamic reconstruction framework that is skillful over most of the region. We show that streamflow in Monsoon Asia is spatially coherent, owing to common drivers from the Pacific, Indian, and Atlantic Oceans. We also show how these oceanic teleconnections change over space and time. By characterizing past and present hydroclimatic variability, we provide a platform for assessing the impact of future climatic changes and informing water management decisions. Plain Language Summary Ten of the world's biggest rivers are located entirely within the Asian Monsoon region. They provide water, energy, and food for 1.7 billion people. To manage these critical resources, we need a better understanding of river discharge-how does it change over a long time? Are there common variation patterns among rivers? To answer these questions, we use information derived from tree rings to reconstruct average annual river discharge history at 62 gauges in 16 Asian countries. Our reconstruction reveals the riparian footprint of megadroughts and large volcanic eruptions over the past eight centuries. We show that simultaneous droughts and pluvials have often occurred at adjacent river basins in the past, because Asian rivers share common influences from the Pacific, Indian, and Atlantic Oceans. We also show how these oceanic teleconnections change over space and time. Our findings can inform big decisions made on water-dependent infrastructure, thus benefiting the riparian people of the Asian Monsoon region.

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Increased Variability of Thailand's Chao Phraya River Peak Season Flow and Its Association With ENSO Variability: Evidence From Tree Ring δ¹⁸O

Cited by 33 publications

References 60 publications

Rainwater isotopes in central Vietnam controlled by two oceanic moisture sources and rainout effects

Rainwater isotopes in central Vietnam controlled by two oceanic moisture sources and rainout effects

Coherent streamflow variability in Monsoon Asia over the past eight centuries---links to oceanic drivers

Coherent Streamflow Variability in Monsoon Asia Over the Past Eight Centuries—Links to Oceanic Drivers

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Increased Variability of Thailand's Chao Phraya River Peak Season Flow and Its Association With ENSO Variability: Evidence From Tree Ring δ18O

Cited by 33 publications

References 60 publications

Rainwater isotopes in central Vietnam controlled by two oceanic moisture sources and rainout effects

Rainwater isotopes in central Vietnam controlled by two oceanic moisture sources and rainout effects

Coherent streamflow variability in Monsoon Asia over the past eight centuries---links to oceanic drivers

Coherent Streamflow Variability in Monsoon Asia Over the Past Eight Centuries—Links to Oceanic Drivers

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Increased Variability of Thailand's Chao Phraya River Peak Season Flow and Its Association With ENSO Variability: Evidence From Tree Ring δ¹⁸O