Perspective on ice age Terminations from absolute chronologies provided by global speleothem records DOI Creative Commons
Nikita Kaushal, Carlos Pérez‐Mejías, Heather Stoll

et al.

Published: May 23, 2024

Abstract. Glacial Terminations represent the largest amplitude climate changes of last several million years. Several possible orbital-insolation triggers have been described to initiate and sustain glacial Terminations. Because availability radiocarbon dating, most recent Termination (TI) has extensively characterized. Yet, it is widely discussed whether sequence feedbacks, millennial events rates change seen in TI recurrent over previous Beyond limit records from speleothem archive provide absolute age control through uranium-thorium dating high-resolution proxy measurements. The PAGES SISALv3 global database allows us synthesize available covering However, signals are encoded a number proxies, unlike proxies other archives like ice or marine cores, climatic interpretation given can vary quite significantly among different regions. In this study, we providing information for Terminations: TII, TIIIA,TIII, TIV TV, present based on aspect records, examine effects volume corrections final record, evaluate there leads lags manifestation across aspects systems regions, suggest directions future research Terminations, speculate suitable tuning targets core discuss what model outputs maybe comparison. We find that TII greatest globally distributed followed by TIIA TIII. TV largely restricted East Asian Southeast monsoon Modelling data-model comparison studies greatly increased our understanding oxygen isotope Ice significant impact European with moisture sourced directly North Atlantic region. Within each Termination, be established between sub-set stays consistent improvements age-model uncertainties, higher resolution multi-proxy approaches required establish sequences within events. further targeted recommendations include focusing as useful next target understand dynamics, isotope-enabled transient simulations better characterization development common speleothems improve chronology

Language: Английский

Modeling tritium release to the atmosphere during the Fukushima Daiichi Nuclear Power Plant accident and application to estimating post-accident water system transit times DOI Creative Commons
Alexandre Cauquoin, Maksym Gusyev, Hayoung Bong

et al.

Environmental Science and Pollution Research, Journal Year: 2025, Volume and Issue: unknown

Published: Jan. 16, 2025

Abstract During the Fukushima Daiichi Nuclear Power Plant (FDNPP) accident on March 11, 2011, radionuclides such as tritium were released into environment across Japan, obscuring natural background signal of in precipitation. This anthropogenic component was rapidly washed out by precipitation according to measurements Japan. However, impact tritium-based estimation water system transit times and other prefectures Japan remains uncertain. For first time, from FDNPP together with simulated an atmospheric general circulation model a good ability represent variations daily monthly accident, we estimate maximum emission 0.815 PBq peak 68.7 Bq/L (582 units) 2011 at Fukushima, which are consistent previous estimations. Using our modeled outputs measurements, improve tritium-tracer application for estimating mean surface groundwater systems impacted accident. While limited compared due thermonuclear testing, globally is useful apply areas studies.

Language: Английский

Citations

0
Multiple Climate Forcings Decomposed From a Tibetan Plateau Ice Core Isotope Record DOI Creative Commons
Li Rong, Zhongyin Cai, Cheng Wang

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(3)

Published: Jan. 31, 2025

Abstract Due to the impact of various climate systems, including Asian Summer Monsoon (ASM) and westerlies, it is challenging identify specific variables from ice core δ 18 O records Tibetan Plateau (TP). Here, we disentangle major modes by applying singular spectrum analysis method a time series in shallow retrieved central TP. This allows us three modes: trend component, El Niño Southern Oscillation (ENSO), Pacific Decadal (PDO). The component mainly reflects warming middle upper troposphere over south TP rather than low land surface temperature changes. Furthermore, found that water vapor these atmospheric layers positively correlates with temperature. We propose up‐and‐over transport such contributes signal record, which also helps understand increasing during last deglaciation. ENSO PDO affect intensity ASM through two phases: warm phases tend weaken monsoon, leading higher values, whereas cool strengthen resulting lower values. Our findings suggest multiple forcings can have their isotopic imprints archives highlight importance analyzing integrated effects diverse climatic drivers. analyses shed light on separating different signals paleoclimate records.

Language: Английский

Citations

0
Assessing the Spatiotemporal Applicability of IsoGSM2 for Simulating Precipitation Isotope Compositions: A Multi‐Timescale Analysis DOI

Haichen Zhao,

Liangju Zhao, Cong Xie

et al.

Hydrological Processes, Journal Year: 2025, Volume and Issue: 39(3)

Published: Feb. 26, 2025

ABSTRACT Stable isotope in precipitation plays a crucial role comprehending the water cycle. Isotope‐enabled General Circulation Models (iGCMs) can continuously simulate compositions of stable hydrogen and oxygen isotopes (δ 2 H δ 18 O) precipitation. The Isotope‐incorporated Global Spectral Model Version (isoGSM2), one iGCMs, has been widely used related research. Here, we use measured O records ) 21 long‐term monitoring stations from Network Isotopes Precipitation modelled M isoGSM2 to compare with at different time intervals (monthly, annual) for whole year (MD, AD), rainy season (RSM, RSA) dry (DSM, DSA). results showed that good performance northern part Oceania, southeastern Asia, central Europe, eastern North America, Greenland South America across all temporal scales, but correlations other vary depending on timescale. RMSE correlation between were better than season. relationship temperature was consistent both MD RSM, as well amount MD. deviation simulated observed values is associated accuracy model's simulation rainfall temperature, real environmental conditions. In addition, may have high sites where AO ENSO are significantly affected. These findings valuable understanding isoGSM2's applicability enhance knowledge

Language: Английский

Citations

0
Antarctic Water Stable Isotopes in the Global Atmospheric Model LMDZ6: From Climatology to Boundary Layer Processes DOI Creative Commons
Niels Dutrievoz, Cécile Agosta, Camille Risi

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2025, Volume and Issue: 130(5)

Published: Feb. 28, 2025

Abstract Observations of water stable isotopes in Antarctic surface snow, precipitation and vapor are key for improving our understanding the atmospheric cycle past climate reconstructions from ice cores. In this study, we use isotopic observations Antarctica to assess skill isotope‐enabled general circulation model LMDZ6, nudged ERA5 above boundary layer (1980–2023 period). The has no significant bias time‐mean temperature snow accumulation over sheet. Sensitivity test on parameterized supersaturation strength highlights its opposite effect O d‐excess. Selecting an intermediate resulted a minimal across continent, with reduced but systematic positive d‐excess (5‰). We then assessed seasonal diurnal isotope variability daily continuous at Dumont d’Urville (DDU, coastal station) Concordia (inland station). On scale, LMDZ6iso accurately reproduces both stations. Moving statistical evaluation physical analysis, individual process contributions boundary‐layer identify main drivers controlling clear‐sky cycles. At Concordia, variations mainly driven by sublimation, whereas DDU they sublimation advection katabatic flow. Our results suggest that further improve LMDZ6iso, fractionation during should be included condensation low better constrained.

Language: Английский

Citations

0
Recent Developments and Emerging Challenges in Tracer‐Aided Modeling DOI Creative Commons
Hyekyeng Jung, Doerthe Tetzlaff, Christian Birkel

et al.

Wiley Interdisciplinary Reviews Water, Journal Year: 2025, Volume and Issue: 12(2)

Published: March 1, 2025

ABSTRACT During the last decade, tracer‐aided hydrological models (TAMs) have been applied in numerous studies and successfully evolved for different purposes. Such confirmed value of tracer data modeling, offering insights into internal storages, water sources, flow pathways, mixing processes, ages, which cannot be derived from hydrometric alone. The direct coupling tracers flux tracking balance can reduce model uncertainty through increased biogeochemical process knowledge. More specifically, such simultaneously capture celerity responses with velocities (and age) particles. As a result availability high‐resolution characterizing functioning across Critical Zone entire landscapes, together rapid improvement computing capacity, four major advances reshaped capability TAMs, we review this paper: (1) enhanced representation spatial heterogeneity, (2) more explicit conceptualization ecohydrological partitioning, (3) application to larger catchment scales, (4) incorporation non‐conservative coupled quality modeling. However, persistent challenges also emerged, particularly relation acquisition, mismatches between information content scale application, uncertainties structures, as well adaptation multi‐criteria calibration. In review, recent remaining TAMs summarized discussed particular focus on conservative models.

Language: Английский

Citations

0
Spatial pattern of amount effect of daily precipitation isotopes in China: A consideration of seasonality based on observation and simulation DOI

Yuqing Qian,

Shengjie Wang, Mingjun Zhang

et al.

Journal of Hydrology, Journal Year: 2025, Volume and Issue: 653, P. 132793 - 132793

Published: Feb. 1, 2025

Language: Английский

Citations

0
Skill of isotope-enabled climate models for daily surface water vapour in East Asia DOI
Shengjie Wang,

Yuqing Qian,

Kei Yoshimura

et al.

Global and Planetary Change, Journal Year: 2024, Volume and Issue: 239, P. 104502 - 104502

Published: June 27, 2024

Language: Английский

Citations

2
Decoupled Hydroclimate of Central and Southwestern Iran Controlled by the Strength of Southerly‐Westerly Jets During Marine Isotope Stage 3 DOI Creative Commons
MOJGAN SOLEIMANI, Jonathan L. Baker, Alireza Nadimi

et al.

Geophysical Research Letters, Journal Year: 2024, Volume and Issue: 51(13)

Published: June 27, 2024

Abstract The regional impact of abrupt glacial climate variability remains poorly constrained for arid southwestern Asia, particularly winter dynamics during Marine Isotope Stage 3, due to limited paleoarchives in the Middle East. Here, we present continuous speleothem records δ 18 O and 13 C with robust chronologies central Iran, spanning ∼50–30 ka. Stable‐isotope signals two stalagmites are generally uncorrelated do not exhibit a consistent response Greenland stadials or interstadials; however, both show positive excursion that coincides Heinrich event 4. We explore potential mechanisms intermittent coupling across Iran through isotope‐enabled atmospheric modeling outputs, from which utilize spatial gradient as proxy wintertime westerly versus southerly jet strength. Our results suggest 4 several stadials, stronger winds enhanced Mediterranean moisture contributions sites reduced aridity southern Iran.

Language: Английский

Citations

1
Comment on cp-2024-37 DOI Creative Commons

Jasper Wassenburg

Published: June 23, 2024

Abstract. Glacial Terminations represent the largest amplitude climate changes of last several million years. Several possible orbital-insolation triggers have been described to initiate and sustain glacial Terminations. Because availability radiocarbon dating, most recent Termination (TI) has extensively characterized. Yet, it is widely discussed whether sequence feedbacks, millennial events rates change seen in TI recurrent over previous Beyond limit records from speleothem archive provide absolute age control through uranium-thorium dating high-resolution proxy measurements. The PAGES SISALv3 global database allows us synthesize available covering However, signals are encoded a number proxies, unlike proxies other archives like ice or marine cores, climatic interpretation given can vary quite significantly among different regions. In this study, we

We find that TII greatest globally distributed followed by TIIA TIII. TV largely restricted East Asian Southeast monsoon Modelling data-model comparison studies greatly increased our understanding oxygen isotope Ice significant impact European with moisture sourced directly North Atlantic region. Within each Termination, be established between sub-set stays consistent improvements age-model uncertainties, higher resolution multi-proxy approaches required establish sequences within events. further targeted records, recommendations include focusing as useful next target understand dynamics, isotope-enabled transient simulations better characterization development common speleothems improve chronology

Language: Английский

Citations

0
Evaluating input data sources for isotope‐enabled rainfall‐runoff models DOI Creative Commons
Andrew Watson, Christian Birkel, Saúl Arciniega‐Esparza

et al.

Hydrological Processes, Journal Year: 2024, Volume and Issue: 38(9)

Published: Sept. 1, 2024

Abstract Isotope‐enabled models provide a means to generate robust hydrological simulations. However, daily isotope‐enabled rainfall‐runoff applied larger spatial scales (>100 km 2 ) require more input data than conventional non‐isotope in the form of precipitation isotope time series, which are difficult even with point station measurements. Spatially distributed can be circumvented by climate models. Here, we evaluate simulations J2000‐isotope enabled model driven from corrected and un‐corrected global regional (isotope‐enabled spectral [IsoGSM] [IsoRSM], respectively) compared 1 year measured reference yearly average for pilot site, data‐scarce sub‐humid Eerste River catchment South Africa. The all products performed well upstream downstream discharge gauges Nash Sutcliffe efficiency (NSE) 0.58 0.85 LogNSE 0.66 0.93. simulated δ H stream isotopes using J2000‐iso J2000‐isoRSM were good main river Kling Gupta (KGE) between 0.4–0.9 top 100 Monte Carlo varying around 5‰ H. For smaller tributaries was unable capture due biased inputs. Adjusting bias IsoRSM improved groundwater simulation outperformed an input. Differences processes only evident when evaluating percolation unrealistic standard J2000 model. While is computationally intensive its counterpart, it provided better improvements percolation. Our results indicate that useful scarce regions models, where water management address change impacts needed.

Language: Английский

Citations

0