Interannual controls on oxygen isotope variability in Asian monsoon precipitation and implications for paleoclimate reconstructions

Yang, Hao; Johnson, K. R.; Griffiths, Michael L.; Yoshimura, Kei

doi:10.1002/2015jd024683

Cited by 85 publications

(79 citation statements)

References 95 publications

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“…Recent studies have used speleothem δ 18 O to study hydroclimate variability at suborbital time scales (Chen et al, ; Sinha et al, , ; Tan et al, , ; Yang et al, ) exploiting the high temporal resolution of speleothem data. Figure b shows Asian speleothem δ 18 O over the Holocene.…”

Section: Coherency Analysis Of Chinese Speleothem δ18o Recordsmentioning

confidence: 99%

“…Later, Liu et al () conducted a time‐slice simulation of the last 21,000 years and reconciled these two opinions, claiming that Chinese speleothem δ 18 O does represent the “monsoon intensity,” with “intensity” mainly referring to southerly winds over China, working synergistically with upstream depletion to drive Chinese speleothem δ 18 O. On interannual time scales, Yang et al () emphasized the role of upstream depletion, monsoon intensity, and El Niño–Southern Oscillation by using a simulation of IsoGSM (Yoshimura et al, ). However, these simulations do not disentangle different processes, such as water vapor transport and local rainfall amount, which influence

δ^{18} O_{P}

.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Emile‐Geay

Tabor

et al. 2019

Paleoceanog and Paleoclimatol

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Speleothem 18 O is widely used to reconstruct past hydroclimate variability, particularly over Asia. However, the interpretation of this proxy is still in debate. While this proxy is originally interpreted as regional rainfall amount of the Asian monsoon, other studies have interpreted it as upstream monsoon rainfall or atmospheric circulation changes. To better understand the signal preserved in speleothems over various time scales, this study employs a state-of-the-art isotope-enabled climate model to quantify contributions to the oxygen isotope composition of precipitation ( 18 O P ) over China. Results suggest that orbital-scale speleothem 18 O variations at Chinese sites mainly record the meridional migration of the Asian monsoon circulation, accompanied by an early northward movement of the East Asian rain belt. At interannual scales, Chinese speleothem 18 O is also tied to the intensity of monsoonal circulation, via a change in moisture source locations: Enhanced moisture delivery from remote source regions leads to more negative 18 O P , particularly in late summer and early autumn. Our results have implications for the hydroclimatic interpretation of speleothem 18 O from Chinese caves and suggest that this interpretation is time scale dependent.

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Section: Coherency Analysis Of Chinese Speleothem δ18o Recordsmentioning

confidence: 99%

δ^{18} O_{P}

.…”

Section: Introductionmentioning

confidence: 99%

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Emile‐Geay

Tabor

et al. 2019

Paleoceanog and Paleoclimatol

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“…Precipitation δ 18 O and relative humidity are the two main factors controlling tree-ring δ 18 O (Roden et al, 2000), and both are related to ISM changes in the monsoonal area. There is a negative correlation between the ISM and precipitation δ 18 O in the monsoonal area (Vuille et al, 2005;Yang et al, 2016). Asian summer monsoon affects the δ 18 O of precipitation through the amount effect (Cai and Tian, 2016;Dansgaard, 1964;Lekshmy et al, 2015).…”

Section: Climatic Signals In the Regional Tree-ring δ 18 O Chronologymentioning

confidence: 99%

Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years: evidence from five tree-ring cellulose oxygen isotope chronologies

Sano

Dimri

et al. 2018

Clim. Past

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Abstract. We have constructed a regional tree-ring cellulose oxygen isotope (δ 18 O) record for the northern Indian subcontinent based on two new records from northern India and central Nepal and three published records from northwestern India, western Nepal and Bhutan. The record spans the common interval from 1743 to 2008 CE. Correlation analysis reveals that the record is significantly and negatively correlated with the three regional climatic indices: all India rainfall (AIR; r = −0.5, p < 0.001, n = 138), Indian monsoon index (IMI; r = −0.45, p < 0.001, n = 51) and the intensity of monsoonal circulation (r = −0.42, p < 0.001, n = 51). The close relationship between tree-ring cellulose δ 18 O and the Indian summer monsoon (ISM) can be explained by oxygen isotope fractionation mechanisms. Our results indicate that the regional tree-ring cellulose δ 18 O record is suitable for reconstructing high-resolution changes in the ISM. The record exhibits significant interannual and long-term variations. Interannual changes are closely related to the El Niño-Southern Oscillation (ENSO), which indicates that the ISM was affected by ENSO in the past. However, the ISM-ENSO relationship was not consistent over time, and it may be partly modulated by Indian Ocean sea surface temperature (SST). Long-term changes in the regional tree-ring δ 18 O record indicate a possible trend of weakened ISM intensity since 1820. Decreasing ISM activity is also observed in various high-resolution ISM records from southwest China and Southeast Asia, and may be the result of reduced land-ocean thermal contrasts since 1820 CE.

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“…In the Asian monsoon region, the isotopic signature of precipitation has been found to correlate with large-scale climatic parameters such as sea surface temperature and relative humidity of the air masses (Dansgaard, 1964;Merlivat and Jouzel, 1979;Clark and Fritz, 1997;Lachniet, 2009), ENSO (Ichiyanagi and Yamanaka, 2005;Tan, 2014;Yang et al, 2016) and the vertical wind shear index (Vuille et al, 2005). Other processes were also identified as relevant for monsoon regions: distillation during vapor transport (Araguás-Araguás et al, 1998;Yoshimura et al, 2003;Vuille et al, 2005;Dayem et al, 2010;Lee et al, 2012;Liu et al, 2014), reevaporation, and rain-vapor interactions (Risi et al, 2008b;Chakraborty et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…However, the factors controlling isotopic variation in precipitation are numerous and complex; hence a better understanding of the climatic influences on isotopic values would improve the use of precipitation isotopes as a proxy to reconstruct paleoclimates (Yang et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

What controls the stable isotope composition of precipitation in the Mekong Delta? A model-based statistical approach

Duy

Heidbüchel

Meyer

et al. 2018

Hydrol. Earth Syst. Sci.

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Abstract. This study analyzes the influence of local and regional climatic factors on the stable isotopic composition of rainfall in the Vietnamese Mekong Delta (VMD) as part of the Asian monsoon region. It is based on 1.5 years of weekly rainfall samples. In the first step, the isotopic composition of the samples is analyzed by local meteoric water lines (LMWLs) and single-factor linear correlations. Additionally, the contribution of several regional and local factors is quantified by multiple linear regression (MLR) of all possible factor combinations and by relative importance analysis. This approach is novel for the interpretation of isotopic records and enables an objective quantification of the explained variance in isotopic records for individual factors. In this study, the local factors are extracted from local climate records, while the regional factors are derived from atmospheric backward trajectories of water particles. The regional factors, i.e., precipitation, temperature, relative humidity and the length of backward trajectories, are combined with equivalent local climatic parameters to explain the response variables δ 18 O, δ 2 H, and d-excess of precipitation at the station of measurement.The results indicate that (i) MLR can better explain the isotopic variation in precipitation (R 2 = 0.8) compared to single-factor linear regression (R 2 = 0.3); (ii) the isotopic variation in precipitation is controlled dominantly by regional moisture regimes (∼ 70 %) compared to local climatic conditions (∼ 30 %); (iii) the most important climatic parameter during the rainy season is the precipitation amount along the trajectories of air mass movement; (iv) the influence of local precipitation amount and temperature is not significant during the rainy season, unlike the regional precipitation amount effect; (v) secondary fractionation processes (e.g., sub-cloud evaporation) can be identified through the d-excess and take place mainly in the dry season, either locally for δ 18 O and δ 2 H, or along the air mass trajectories for d-excess. The analysis shows that regional and local factors vary in importance over the seasons and that the source regions and transport pathways, and particularly the climatic conditions along the pathways, have a large influence on the isotopic composition of rainfall. Although the general results have been reported qualitatively in previous studies (proving the validity of the approach), the proposed method provides quantitative estimates of the controlling factors, both for the whole data set and for distinct seasons. Therefore, it is argued that the approach constitutes an advancement in the statistical analysis of isotopic records in rainfall that can supplement or precede more complex studies utilizing atmospheric models. Due to its relative simplicity, the method can be easily transferred to other regions, or extended with other factors.The results illustrate that the interpretation of the isotopic composition of precipitation as a recorder of local climatic conditions, as for...

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Interannual controls on oxygen isotope variability in Asian monsoon precipitation and implications for paleoclimate reconstructions

Cited by 85 publications

References 95 publications

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Deciphering Oxygen Isotope Records From Chinese Speleothems With an Isotope‐Enabled Climate Model

Decreasing Indian summer monsoon on the northern Indian sub-continent during the last 180 years: evidence from five tree-ring cellulose oxygen isotope chronologies

What controls the stable isotope composition of precipitation in the Mekong Delta? A model-based statistical approach

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