Climate variability over the past 100 years in Myanmar derived from tree-ring stable oxygen isotope variations in Teak

Pumijumnong, Nathsuda; Muangsong, Chotika; Buajan, Supaporn; Sano, Masaki; Nakatsuka, Takeshi

doi:10.1007/s00704-019-03036-y

Cited by 10 publications

(5 citation statements)

References 70 publications

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“…12d-f) when annual precipitation is at its maximum ( Fig. 12a-c), as demonstrated by previous studies of monsoonal Asia (Li et al, 2015;Liu et al, 2017;Pumijumnong et al, 2019;Sano et al, 2012Sano et al, , 2013Sano et al, , 2017Seo et al, 2019;Xu et al, 2013Xu et al, , 2018Xu et al, , 2019. Spatial correlations of δ 18 O cel(climate) with June-July precipitation in East Asia (Fig.…”

Section: Calculation Of Temporal Variations In the Climatological Comsupporting

confidence: 78%

“…All samples contain hundreds of rings. Although some samples have already been dated by traditional dendrochronological methods using tree-ring width (Mitsutani, 2000;NNRICP, 1990), the new tree-ring δ 18 O time series were used in the final dendrochronological determination of their ages (Roden, 2008;Yamada et al, 2018), which provided results consistent with the tree-ring width dating results (Fig. S1).…”

Section: Collection Of Tree-ring Samplesmentioning

confidence: 59%

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A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen isotopes

Nakatsuka¹,

Sano²,

Li³

et al. 2020

Clim. Past

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Abstract. Oxygen isotope ratios (δ18O) of tree-ring cellulose are a novel proxy for summer hydroclimate in monsoonal Asia. In central Japan, we collected 67 conifer wood samples, mainly Chamaecyparis obtusa, with ages encompassing the past 2600 years. The samples were taken from living trees, archeological wood, architectural wood, and buried logs. We analyzed stable isotope ratios of oxygen (δ18O) and hydrogen (δ2H) in tree-ring cellulose in these samples (more than 15 000 rings in total) without using a pooling method and constructed a statistically reliable tree-ring cellulose δ18O time series for the past 2500 years. However, there were distinct age trends and level offsets in the δ18O record, and cellulose δ18O values showed a gradual decrease as an individual tree matures. This suggested it is difficult to establish a cellulose δ18O chronology for low-frequency signals by simple averaging of all the δ18O time series data. In addition, there were opposite age trends in the cellulose δ2H, and δ2H gradually increased with tree age. There were clear positive correlations in the short-periodicity variations between δ18O and δ2H, probably indicating a common climate signal. A comparison of the δ18O and δ2H time series in individual trees with tree-ring width suggested that the opposite age trends of δ18O and δ2H are caused by temporal changes in the degree of post-photosynthetic isotope exchange with xylem water (physiological effect), accompanied by changes in stem growth rate that are influenced by human activity in the forests of central Japan. Based on the assumptions that cellulose δ18O and δ2H vary positively and negatively with constant proportional coefficients due to climatological and physiological effects, respectively, we solved simultaneous equations for the climatological and physiological components of variations in tree-ring cellulose δ18O and δ2H in order to remove the age trend. This enabled us to evaluate the climatic record from cellulose δ18O variations. The extracted climatological component in the cellulose δ18O for the past 2600 years in central Japan was well correlated with numerous instrumental, historical, and paleoclimatological records of past summer climate at various spatial and temporal scales. This indicates that integration of tree-ring cellulose δ18O and δ2H data is a promising method to reconstruct past summer climate variations on annual to millennial timescales, irrespective of the growth environment. However, analytical and statistical methods need to be improved for further development of this climate proxy.

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Section: Calculation Of Temporal Variations In the Climatological Comsupporting

confidence: 78%

Section: Collection Of Tree-ring Samplesmentioning

confidence: 59%

A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen isotopes

Nakatsuka¹,

Sano²,

Li³

et al. 2020

Clim. Past

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“…Comparison between δ 18 o tr and other proxies in nearby areas. The relationship between our teak δ 18 O tr and teak δ 18 O tr from the Phrae Province, which is approximately 400 km away, was 0.501, p < 0.001 42 , and Myanmar teak δ 18 O tr was 0.566, p < 0.001 43 . We also found a relationship between our teak δ 18 O tr and Pinus merkusii δ 18 O from Mae Hong Son (0.646, p < 0.001) 44 and from Umpang, Tak Province (0.522, p < 0.001) 45 .…”

Section: Discussionmentioning

confidence: 66%

A 338-year tree-ring oxygen isotope record from Thai teak captures the variations in the Asian summer monsoon system

Pumijumnong

Bräuning

Sano

et al. 2020

Sci Rep

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A 338-year oxygen isotope record from teak tree-ring cellulose collected from Mae Hong Son province in northwestern Thailand was presented. The tree-ring series preserves the isotopic signal of the regional wet season rainfall and relative humidity. Tree-ring δ 18 O correlates strongly with regional rainfall from May to October, showing coherent variations over large areas in Southeast Asia. We reconstructed the summer monsoon season (May to October) rainfall based on a linear regression model that explained 35.2% of the actual rainfall variance. Additionally, we found that in the 19 th century, there was a remarkable drought during many years that corresponded to regional historic drought events. The signals of the June to September Indian summer monsoon (ISM) for the period between 1948 and 2009 were clearly found. Spatial correlations and spectral analyses revealed a strong impact of the El Niño-Southern Oscillation (ENSO) on tree-ring δ 18 O. However, ENSO influenced the tree-ring δ 18 O more strongly in the 1870-1906, 1907-1943, and 1944-1980 periods than in the 1981-2015 period, which corresponded to periods of weaker and stronger ISM intensity.

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“…We compared our δ 18 O TR chronology with other proxies within the region. The relationship between our δ 18 O TR and a teak δ 18 O TR from Phrae province, which is approximately 400 km away, was r = 0.446, p < 0.001 [16], and Myanmar teak δ 18 O TR was 0.532, p < 0.001 [41]. We also found significant relationships between our teak δ 18 O TR and Pinus merkusii δ 18 O TR from Mae Hong Son (r = 0.636, p < 0.001) [19] and Tak province (r = 0.532, p < 0.001) [18].…”

Section: Chronology Characteristics Of All Tree-ring Parametersmentioning

confidence: 60%

Teak Tree-Ring Cellulose δ13C, δ18O, and Tree-Ring Width from Northwestern Thailand Capture Different Aspects of Asian Monsoon Variability

Pumijumnong

Payomrat²,

Buajan

et al. 2021

Atmosphere

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The inter-annual variability in tree-ring cellulose δ13C (δ13CTR, δ18OTR), and tree-ring chronology in teak (TRW) (Tectona grandis L.f.) trees from Northwestern Thailand during 1901–2009 AD was performed. The δ13CTR and δ18OTR have a positive correlation, significant at r =0.400, p <0.0001, and both of the stable isotopes were not significantly related to the TRW. The TRW is related to rainfall in the first half of the rainy season and has a strong relationship with the relative humidity. The δ18OTR captured moisture well throughout the rainy season, and the δ13CTR had a strong correlation with rainfall in the second half of the rainy season and had a high correlation with cloud fraction and vapor pressure. The δ13CTR and δ18OTR were associated with the stomata conductance response, but had no effect on photosynthesis. The three indices of the teak annual ring respond well to the variability in the Asian monsoon, and give us a better understanding of both the hydrological cycle and the factors that contribute to the growing of tropical broadleaf trees under changing climates.

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Climate variability over the past 100 years in Myanmar derived from tree-ring stable oxygen isotope variations in Teak

Cited by 10 publications

References 70 publications

A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen isotopes

A 2600-year summer climate reconstruction in central Japan by integrating tree-ring stable oxygen and hydrogen isotopes

A 338-year tree-ring oxygen isotope record from Thai teak captures the variations in the Asian summer monsoon system

Teak Tree-Ring Cellulose δ13C, δ18O, and Tree-Ring Width from Northwestern Thailand Capture Different Aspects of Asian Monsoon Variability

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