Influences of relative humidity and Indian monsoon precipitation on leaf water stable isotopes from the southeastern Tibetan Plateau

Yu, Wusheng; Xu, Bin; Lai, Chun‐Ta; Ma, Yaoming; Tian, Lide; Qu, Dongmei; Zhu, Zhiyong

doi:10.1002/2014gl062004

Cited by 22 publications

(14 citation statements)

References 42 publications

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“…Previous studies have shown that δ 18 O variations in precipitation on the southern Tibetan Plateau differ distinctly from those on the northern Tibetan Plateau (Tian et al, 2003;Yao et al, 2013). In addition, many scientists have investigated the roles of various climatic factors, especially the Asian monsoon's influence on δ 18 O in precipitation (Aizen et al, 1996;Araguás-Araguás et al, 1998;Posmentier et al, 2004;Vuille et al,ies have also investigated δ 18 O in river water (Bershaw et al, 2012), lake water (Yuan et al, 2011), and plant water Yu et al, 2014b). In comparison, only a few studies have focused on δ 18 O from water vapour over the Tibetan Plateau (Yatagai et al, 2004;Yu et al, 2005;Kurita and Yamada, 2008;Yin et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Simultaneous monitoring of stable oxygen isotope composition in water vapour and precipitation over the central Tibetan Plateau

Tian

et al. 2015

Atmos. Chem. Phys.

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Abstract. This study investigated daily δ 18 O variations of water vapour (δ 18 O v ) and precipitation (δ 18 O p ) simultaneously at Nagqu on the central Tibetan Plateau for the first time. Data show that the δ 18 O tendencies of water vapour coincide strongly with those of associated precipitation. The δ 18 O values of precipitation affect those of water vapour not only on the same day, but also for the following several days. In comparison, the δ 18 O values of local water vapour may only partly contribute to those of precipitation. During the entire sampling period, the variations of δ 18 O v and δ 18 O p at Nagqu did not appear dependent on temperature, but did seem significantly dependent on the joint contributions of relative humidity, pressure, and precipitation amount. In addition, the δ 18 O changes in water vapour and precipitation can be used to diagnose different moisture sources, especially the influences of the Indian monsoon and convection. Moreover, intense activities of the Indian monsoon and convection may cause the relative enrichment of δ 18 O p relative to δ 18 O v at Nagqu (on the central Tibetan Plateau) to differ from that at other stations on the northern Tibetan Plateau. These results indicate that the effects of different moisture sources, including the Indian monsoon and convection currents, need be considered when attempting to interpret paleoclimatic records on the central Tibetan Plateau.

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Section: Introductionmentioning

confidence: 99%

Simultaneous monitoring of stable oxygen isotope composition in water vapour and precipitation over the central Tibetan Plateau

Tian

et al. 2015

Atmos. Chem. Phys.

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“…Compound specific δD of lipids preserved in lake sediments might serve as a potential proxy for past hydroclimate changes, since terrestrial and aquatic plants/algae use their own ambient water for lipid biosynthesis (e.g. Yapp and Epstein, 1982;Sessions et al, 1999;Sachse et al, 2004Sachse et al, , 2012Aichner et al, 2010;Duan et al, 2014;Rao et al, 2014;Yu et al, 2014;Aichner et al, 2015;Yao et al, 2015;Thomas et al, 2016). Many studies have used δD values of mid-and long chain n-alkanes to reconstruct individual isotopic information of aquatic and terrestrial source water (e.g.…”

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confidence: 99%

“…δD values of both short-chain and long-chain n-FA are influenced by multiple factors, making it difficult to fully delineate the mechanism of isotopic fractionation process (e.g. Duan et al, 2014;Yu et al, 2014;Aichner et al, 2015;Yao et al, 2015), which in turn would prevent us from applying down-core isotopic records to paleohydroclimatic reconstruction. However, if we have already extracted climatic information from a sedimentary core using different proxies, we may infer controlling factors of isotopic fractionation process through time using the same core.…”

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confidence: 99%

Holocene climate controls on water isotopic variations on the northeastern Tibetan Plateau

Liu

Wang

et al. 2016

Chemical Geology

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On the Tibetan Plateau, applications of δD and δ 18O values in paleoclimate studies tend to be complicated due to multiple processes influencing isotopic compositions in paleoclimatic archives. In this study, isotopic compositions of modern waters in the eastern Qaidam Basin on the northeastern Tibetan Plateau, and δD values of n-fatty acids (n-FA δD) from a sediment core at Hurleg Lake were systematically analyzed to infer hydroclimate controls during the Holocene. The modern water isotopic results show a major contribution of snowmelt water originating from high-elevation mountains to the north of the Qaidam Basin via river and groundwater discharge, and the importance of evaporation in affecting lake water budget in this region. n-C 26 FA δD values tend to be more negative at millennial-scale warm-dry periods during the Holocene, and vice versa, opposite to what is commonly expected. Assisted with modern water isotopic results, we infer amplified contribution of snowmelt water to the soil water around this open lake system at warm-dry periods. Meanwhile, changes in n-C 16 FA δD values at Hurleg Lake reflect the evolution of isotopic compositions of lake water, thus we use the isotopic difference between n-C 26 and n-C 16 FA (ΔD C16-C26 ) to infer hydroclimate and evaporation variations in this region. Based on our data, relatively low n-C 26 FA δD and n-C 16 FA δD values at 10-6 cal ka BP indicate large contribution of snowmelt water into the lake during the Holocene Climate Optimum. After 6 cal ka BP, changes in evaporation became the major control on lake hydrology and led to larger fluctuations of ΔD C16-C26 . Our study highlights the importance of systematic analysis on modern processes before using stable isotopes for paleoclimate reconstructions, and demonstrates that δD difference between long-chain and short-chain n-FA might be an effective way to better understand the controlling factor of hydrological variations in a climatic complex region like the Tibetan Plateau.

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“…The signature of RH is recorded in the plant OM via its isotopic effect on the leaf water (Barbour, ; Sternberg, ; Sternberg et al, ). Both controlled and field‐based measurements have demonstrated an inverse relationship between RH and the 18 O enrichment of leaf water (Flanagan & Ehleringer, ; Yu et al, ; Zundel et al, ). The leaf water undergoes enrichment in the heavier isotope 18 O as a result of the preferential loss of 16 O by the evaporative loss of water during transpiration.…”

Section: Discussionmentioning

confidence: 99%

Stable Oxygen and Carbon Isotopic Composition of Rice (Oryza sativa L.) Grains as Recorder of Relative Humidity

Kaushal

Ghosh

2018

JGR Biogeosciences

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Southwest monsoon season over India exhibits spatial variation in the relative humidity (RH) levels. We took advantage of rice (Oryza sativa L.), cultivated in varied RH condition during the southwest monsoon season, to study the relationship of oxygen and carbon isotopic composition in the bulk grain organic matter (δ18OOM, δ13COM) with the hydroclimatic parameter of RH. Seasonal harvests of the years 2010 through 2014, sampled from 23 sites located in different climatic zones over India, were used for this experiment. Several fields and different genotypes (n = 105) were sampled at each site to arrive at representative values of δ18OOM and δ13COM. Based on regression analyses, the δ18OOM variation across sites showed significant dependence on the δ18O of source water (δ18OSW) used by the crops, with the humid region registering the strongest correlation (r2 = 0.95, p < 0.0001). After normalizing δ18OOM values with respect to δ18OSW and expressing the deviation as Δ18OOM, we obtained a significant relationship between the growing‐season average RH and Δ18OOM (r2 = 0.90, p < 0.0001). This is represented by a linear response function: Δ18OOM = (− 0.45 ± 0.03) × RH + (66.4 ± 2.7). The relationship established in this study enables the reconstruction of RH level from the isotopic measurement of rice grain OM in modern‐day and palaeo samples. Further, the relationship of the carbon isotope discrimination in rice grain OM (Δ13COM) with RH gradient demonstrates the role of the evaporative demand in governing the dual‐isotope variability.

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Influences of relative humidity and Indian monsoon precipitation on leaf water stable isotopes from the southeastern Tibetan Plateau

Cited by 22 publications

References 42 publications

Simultaneous monitoring of stable oxygen isotope composition in water vapour and precipitation over the central Tibetan Plateau

Simultaneous monitoring of stable oxygen isotope composition in water vapour and precipitation over the central Tibetan Plateau

Holocene climate controls on water isotopic variations on the northeastern Tibetan Plateau

Stable Oxygen and Carbon Isotopic Composition of Rice (Oryza sativa L.) Grains as Recorder of Relative Humidity

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