Temperature signals of ice core and speleothem isotopic records from Asian monsoon region as indicated by precipitation δ18O

Yu, Wusheng; Yao, Tandong; Thompson, Lonnie G.; Jouzel, Jean; Zhao, Huabiao; Xu, Bin; Jing, Zhaowei; Wang, Ninglian; Wu, Guangjian; Ma, Yaoming; Gao, Jing; Yang, Xiaoxin; Zhang, Jingyi; Qu, Dongmei

doi:10.1016/j.epsl.2020.116665

Cited by 34 publications

(11 citation statements)

References 61 publications

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“…To reduce the bioavailability and avoid water isotopic fractionation caused by volatilization, parafilm (PM‐996, country of origin: USA) was tightly wrapped around the gap in the bottle cap to prevent secondary pollution or evaporation and then stored at −20°C before analysis. Similar experimental processes for water isotopes have also been reported previously (Chen, Huang, et al., 2021; Lian et al., 2016; Wu et al., 2021; Yu et al., 2016, 2021; Zhou et al., 2022). After field sampling, the Chl a and nutrient samples were measured within 1 week, and the dual water isotope samples were measured within 2 weeks.…”

Section: Methodssupporting

confidence: 85%

Quantification of the Seasonal Intrusion of Water Masses and Their Impact on Nutrients in the Beibu Gulf Using Dual Water Isotopes

Lao

Zhang

et al. 2022

JGR Oceans

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A new data set of seasonal stable water isotopes (δD and δ18O) and temperature‐salinity profiles was applied to improve our understanding of water mass distributions and their impact on the environment of the Beibu Gulf (BG). Our study revealed that the coastal current (CC), West‐Guangdong coastal current (WGCC), and South China Sea water (SCSW) were the three dominant water masses in the BG, and their influence was exhibited in seasonal variations. The CC was the dominant contributor to the BG water during summer (43%) and fall (45%), while it changed to the intrusion of SCSW with higher salinity in winter (57%). The contribution of WGCC to the BG was relatively stable during the three seasons (24%–31%). In addition, the nutrients in the BG were greatly affected by different water mixing occurring in the gulf. The nutrients mainly originated from the CC in summer (52%–68%) and fall (32%–69%), while the dominant source shifted to the WGCC in winter (36%–69%). Moreover, the contribution of SCSW to the nutrients loading (15%–49%) in the BG was relatively high due to its high contribution (57%) to the BG water during winter. These indicated that the BG has a stable input of external nutrients from different water masses to sustain primary production in the BG. Our study uses dual water isotopes to quantify the seasonal intrusion of water masses and their impact on nutrients, providing a new method to study the impact of the distribution of water masses on nutrients in the gulf.

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Section: Methodssupporting

confidence: 85%

Quantification of the Seasonal Intrusion of Water Masses and Their Impact on Nutrients in the Beibu Gulf Using Dual Water Isotopes

Lao

Zhang

et al. 2022

JGR Oceans

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“…In isotope‐enabled GCMs, water isotopologues are implemented as passive tracers that undergo exactly the same processes as standard water and fractionate during phase changes. Such isotope‐enabled GCMs have also been widely used to better understand how isotopes preserve the past climatic signal at paleoclimatic time scales (Bühler et al., 2020; Feng et al., 2013; Hu et al., 2019; Liu et al., 2014; Risi et al., 2010; Tabor et al., 2018; Yu et al., 2020) and at the inter‐annual to decadal time scales (Hu et al., 2019; Ishizaki et al., 2012; Münch & Laepple, 2018; Vuille et al., 2003; Vuille & Werner, 2004). For instance, the stable oxygen isotopic ratio in ice cores is widely used as a proxy for temperature because of the significant positive correlation between air temperature and precipitation δ 18 O (An et al., 2016; Yao et al., 1996, 2013).…”

Section: Introductionmentioning

confidence: 99%

What Controls the Skill of General Circulation Models to Simulate the Seasonal Cycle in Water Isotopic Composition in the Tibetan Plateau Region?

Shi

Risi

et al. 2022

JGR Atmospheres

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This study evaluates the simulation of the seasonal cycle of water isotopic composition over Tibetan Plateau regions (TP) from six isotope‐enabled general circulation models (GCMs) participating in the second Phase of Stable Water Isotope Intercomparison Group. For both meteorological factors (precipitation rate and wind field) and isotopic composition, GCMs generally agree with reanalysis data and in‐situ observations, but there is a significant spread across models and the isotopic seasonality is systematically underestimated. In the southern TP, the precipitation isotopic composition is more depleted in summer than in winter, and the amplitude of the simulated isotopic seasonal variations is primarily driven by the amplitude of the simulated upstream precipitation. In contrast, in the northern TP, the precipitation isotopic composition is more depleted in winter than in summer, and the amplitude of the simulated seasonal variability of isotopes is mainly driven by the simulated strength of the zonal wind. We conclude that the skill of a GCM to simulate the seasonal cycle in the isotopic composition depends mainly on the skill of the GCM to simulate the Indian summer monsoon precipitation and the westerlies. The same causes contributing to the underestimated seasonality at present‐day may also contribute to the underestimated δ18O change at the mid‐Holocene.

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“…Seasonal fluctuation in the LNA-to-HNA ratio was also observed in the ZQP Glacier. O18 isotopic ratio, an Indian monsoon precipitation proxies ( Yu et al, 2021 ), exhibited a negative correlation with the LNA-to-HNA ratio significantly ( p < .001, Figure 3 ). As shown in Figure 4 , LNA functional groups were more prevalent in the monsoon samples with an average LNA-to-HNA ratio of .14 ± .11 ( Figure 4 ).…”

Section: Resultsmentioning

confidence: 97%

Variation of High and Low Nucleic Acid-Content Bacteria in Tibetan Ice Cores and Their Relationship to Black Carbon

Mao

et al. 2022

Front. Microbiol.

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Nutrient enrichment caused by black carbon (BC) is a major ecological crisis in glacial ecosystems. The microbiological effects of BC were assessed in this study by using fluorescent fingerprinting assay based on flow cytometry (FCM) of bacterial communities with low (LNA) and high (HNA) nucleic acid-content bacteria. Here, we investigated a high-resolution temporal variation of bacterial abundance and LNA/HNA ratio in Tibetan ice cores. Our results revealed that bacterial abundance was proportional to the atmospheric BC on the glaciers. The shift of LNA functional groups to HNA functional groups in glaciers suggested BC emissions increased the proportion of highly active cells. In addition, distinct number of LNA and HNA functional groups was identified between the monsoon and non-monsoon seasons. Westerly winds with high amounts of BC accounted for high ratio of HNA functional groups during the non-monsoon season. In comparison, high moisture during the monsoon season decreased atmospheric BC loading, which increases the ratio of LNA functional groups. Correlations between BC and functional groups were very strong, showing that two functional groups may serve as early-warning indicators of microbiological effects of BC at low trophic level. Our approach provides a potential early-warning framework to study the influences of atmospheric BC on the glaciological community.

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Temperature signals of ice core and speleothem isotopic records from Asian monsoon region as indicated by precipitation δ18O

Cited by 34 publications

References 61 publications

Quantification of the Seasonal Intrusion of Water Masses and Their Impact on Nutrients in the Beibu Gulf Using Dual Water Isotopes

Quantification of the Seasonal Intrusion of Water Masses and Their Impact on Nutrients in the Beibu Gulf Using Dual Water Isotopes

What Controls the Skill of General Circulation Models to Simulate the Seasonal Cycle in Water Isotopic Composition in the Tibetan Plateau Region?

Variation of High and Low Nucleic Acid-Content Bacteria in Tibetan Ice Cores and Their Relationship to Black Carbon

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