Comparative analysis of EPIK, DRASTIC, and DRASTIC-LUC methods for groundwater vulnerability assessment in karst aquifers of the Western Amazon Basin

Environmental Earth Sciences, Journal Year: 2025, Volume and Issue: 84(3)

Published: Jan. 22, 2025

Language: Английский

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Depth-Dependent isotope dynamics in karst Reservoirs: Multi-Decadal monitoring insights from French caves

Journal of Hydrology, Journal Year: 2025, Volume and Issue: unknown, P. 133028 - 133028

Published: March 1, 2025

Language: Английский

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Moisture sources and isotopic composition of Meiyu-Baiu rainfall in southwestern Japan from 2004 to 2023

Research Square (Research Square), Journal Year: 2025, Volume and Issue: unknown

Published: March 25, 2025

To better understand the underlying atmospheric processes responsible for interannual variability of Meiy-Baiu rainfall, we utilized an isotopic regional spectral model to investigate moisture sources and composition Meiyu-Baiu rainfall in southwestern Japan from 2004 2023. Asian Monsoon (AM) moisture, transported by monsoonal southwesterlies middle levels, contributed 50.9% total with low δ²H high d-excess. Conversely, North Pacific subtropical (NPSH) levels accounted 28.6% AM during heavy seasons exhibited lower higher d-excess, due more rainout below-cloud evaporation. In contrast, signals NPSH were relatively consistent between light seasons. Extreme showed d-excess contribution (57.8%) at precipitation efficiency, which facilitates deep convection, triggering extreme events The study highlights importance East Asia. findings providing valuable insights into understanding water cycle Asia, as well improving seasonal forecasts near-future predictions rainfall.

Language: Английский

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Moisture sources and isotopic composition of a record-breaking heavy Meiyu-Baiu rainfall in southwestern Japan in early July 2020

Atmospheric Research, Journal Year: 2023, Volume and Issue: 286, P. 106693 - 106693

Published: Feb. 28, 2023

Torrential Meiyu-Baiu rainfall events have become more frequent in East Asia this decade. The moisture source and isotopic composition of precipitation are crucial for understanding the underlying dynamical thermodynamic processes extreme heavy rainfall. To clarify composition, we simulated a record-breaking over Kyushu southwestern Japan early July 2020 using an regional spectral model. In addition, observed to validate simulations. Moisture sources were classified into three groups: Asian monsoon (AM) from Indian Ocean, South China Sea, Continent; North Pacific subtropical high (NPSH) Ocean Philippine Sea; local Kuroshio region, Sea Japan. remote AM NPSH was dominant. moisture, transported by at low levels, gradually increased period. While monsoonal southwesterly flow mid-level, rapidly association with Baiu frontal depression merged middle Meanwhile, quasi-stationary convective band (QSCB) formed then triggered As condensation exhibited lower δ2H higher d-excess beginning on north side QSCB. Regarding effects hydrometeorological principally attributable rainout below-cloud evaporation during transport process, rather than surface regions. This study systematically clarified major their corresponding dynamics respect evaporation, transport, rainout, torrential findings may be useful weather forecasting disaster prevention Asia.

Language: Английский

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South American monsoon intensification during the last millennium driven by joint Pacific and Atlantic forcing

Science Advances, Journal Year: 2024, Volume and Issue: 10(38)

Published: Sept. 20, 2024

The South American summer monsoon (SASM) profoundly influences tropical America’s climate, yet understanding its low-frequency variability has been challenging. Climate models and oxygen isotope data have used to examine the SASM over last millennium (LM) but have, at times, provided conflicting findings, especially regarding mean-state change from Medieval Anomaly Little Ice Age. Here, we use a paleoclimate assimilation (DA) method, combining model results δ 18 O observations, produce O-enabled, dynamically coherent, spatiotemporally complete austral hydroclimate reconstruction LM for America 5-year resolution. This aligns with independent records withheld DA, revealing centennial-scale intensification during MCA-LIA transition period, associated southward shift of Atlantic Intertropical Convergence Zone strengthening Pacific Walker circulation (PWC). highlights necessity accurately representing PWC in climate predict future changes.

Language: Английский

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Moisture sources and isotopic composition of the 2020 extraordinary and persistent Meiyu rainfall in the Yangtze River valley modulated by large-scale circulations

Atmospheric Research, Journal Year: 2023, Volume and Issue: 297, P. 107114 - 107114

Published: Nov. 13, 2023

Meiyu rainfall is an important climate phenomenon in East Asia, but its interannual variability has amplified recent decades. To gain a better understanding of the underlying atmospheric processes torrential rainfall, we investigated moisture sources and isotopic composition 2020 extraordinary persistent Yangtze River valley from June 19 to July 10 using regional spectral model. During period, significant amounts Indian Ocean were transported by monsoonal southwesterlies, especially middle levels between 850 hPa 600 hPa. Whereas moderate Asian continent distributed principally within boundary layer below Besides, tiny South China Sea western Pacific subtropical high lower reaches 900 With respect characteristics, lowest δ2H highest d-excess values attributable more rainout below-cloud evaporation during long-distance transport. In contrast, signals relatively preserved. The exhibited intraseasonal was classified into heavy light periods based on amount. Heavy with northward migration characterized enhanced higher d-excess, resulting westward expansion deepened mid-latitude trough.

Language: Английский

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Estimating groundwater recharge and precipitation sources of the Zamora River Basin, southeastern Ecuador, using GIS and stable isotopes

Environmental Earth Sciences, Journal Year: 2023, Volume and Issue: 82(17)

Published: Aug. 16, 2023

Language: Английский

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The isotopic composition of the French Illimani ice core in the Bolivian Andes supports the east-west South American precipitation dipole from the last deglaciation to the mid-Holocene

Quaternary Science Reviews, Journal Year: 2024, Volume and Issue: 347, P. 109098 - 109098

Published: Nov. 25, 2024

Language: Английский

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Disentangling seasonal and annual precipitation signals in the tropics over the Holocene: Insights from δD, alkanes and GDGTs

Quaternary Science Reviews, Journal Year: 2024, Volume and Issue: 344, P. 108948 - 108948

Published: Oct. 4, 2024

Language: Английский

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Moisture Sources and Rainfall δ18O Variability over the Central Andes of Peru—A Case Study from the Mantaro River Basin

Water, Journal Year: 2023, Volume and Issue: 15(10), P. 1867 - 1867

Published: May 15, 2023

The Mantaro River Basin is one of the most important regions in central Peruvian Andes terms hydropower generation and agricultural production. Contributions to better understanding climate hydrological dynamics are vital for this region constitute key information support regional water security socioeconomic resilience. This study presents eight years monthly isotopic precipitation (δ18O, Dxs) collected Basin. signals were evaluated moisture sources, including local climatic parameters, interpret their variability at interannual timescales. It proposed that degree rainout upstream transport history air masses, also related atmospheric features, main factors influencing δ18O variability. Moreover, significant correlations with amount relative humidity imply processes exert control over Two extreme events (the 2010 drought 2017 coastal El Niño) determine how circulation affects rainfall isotope Based on these results, recommendations hydroclimate studies paleoclimate reconstructions context intends encourage new applications considering geochemical evidence Andean region.

Language: Английский

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