Comment on acp-2022-223 DOI Creative Commons
Di Wang, Lide Tian, Camille Risi

et al.

Published: Sept. 30, 2022

Abstract. Stable water isotopes are natural tracers in the hydrological cycle and have been applied hydrology, atmospheric science, ecology, paleoclimatology. However, factors controlling isotopic distribution, both at spatial temporal scales, debated low middle latitude regions, due to significant influence of large-scale circulation complex sources vapor. For first time, we made situ observations near-surface vapor over a large region (over 10 000 km) across China pre-monsoon monsoon seasons, using newly designed vehicle-based isotope monitoring system. Combined with daily multiyear monthly mean outputs from isotope-incorporated global spectral model (Iso-GSM) infrared sounding interferometer (IASI) satellite calculate relative contribution, found that observed variations periods represent mainly seasonal variations, but influenced by more synoptic-scale during period. The δ18O controlled Rayleigh distillation along air mass trajectories period, significantly different moisture sources, continental recycling processes, convection transport Thus, North–South gradient period is counteracted variation reflects summer convective precipitation southern dependence on temperature North. d-excess reflect recycling. Iso-GSM successfully captures distribution performance weaker maybe underestimation local or short-term high-frequency synoptic variations. These results provide an overview variability composition East Asia their factors, they emphasize need interpret proxy records context regional

Language: Английский

Vehicle-based in situ observations of the water vapor isotopic composition across China: spatial and seasonal distributions and controls DOI Creative Commons
Di Wang, Lide Tian, Camille Risi

et al.

Atmospheric chemistry and physics, Journal Year: 2023, Volume and Issue: 23(6), P. 3409 - 3433

Published: March 20, 2023

Abstract. Stable water isotopes are natural tracers in the hydrological cycle and have been applied hydrology, atmospheric science, ecology, paleoclimatology. However, factors controlling isotopic distribution, both at spatial temporal scales, debated low middle latitude regions, due to significant influence of large-scale circulation complex sources vapor. For first time, we made situ observations near-surface vapor over a large region (over 10 000 km) across China pre-monsoon monsoon seasons, using newly designed vehicle-based isotope monitoring system. Combined with daily multiyear monthly mean outputs from isotope-incorporated global spectral model (Iso-GSM) infrared sounding interferometer (IASI) satellite calculate relative contribution, found that observed variations periods represent mainly seasonal variations, but influenced by more synoptic-scale during period. The δ18O controlled Rayleigh distillation along air mass trajectories period, significantly different moisture sources, continental recycling processes, convection transport Thus, North–South gradient period is counteracted variation reflects summer convective precipitation southern dependence on temperature North. d-excess reflect recycling. Iso-GSM successfully captures distribution performance weaker maybe underestimation local or short-term high-frequency synoptic variations. These results provide an overview variability composition East Asia their factors, they emphasize need interpret proxy records context regional

Language: Английский

Citations

15
OF–CEAS laser spectroscopy to measure water isotopes in dry environments: example of application in Antarctica DOI Creative Commons
Thomas Lauwers, Élise Fourré, Olivier Jossoud

et al.

Atmospheric measurement techniques, Journal Year: 2025, Volume and Issue: 18(5), P. 1135 - 1147

Published: March 6, 2025

Abstract. Water vapour isotopes are important tools to better understand processes governing the atmospheric hydrological cycle. Their measurement in polar regions is crucial improve interpretation of water isotopic records ice cores. In situ monitoring remains challenging, especially dry places East Antarctic Plateau, where mixing ratios can be as low 10 ppm. We present this article new commercial laser spectrometers based on optical-feedback cavity-enhanced absorption spectroscopy (OF–CEAS) technique, adapted for measurements regions. characterise a first instrument coastal with an optical cavity finesse 64 000 (ring-down time 54 µs), installed at Dumont d'Urville Station during summer campaign 2022–2023, and second high 116 (98 µs ring-down time), deployed inland Antarctica. With drift calibration every 24 h, stability demonstrated by high-finesse allows one study diurnal cycles down ppm humidity δD 100 δ18O.

Language: Английский

Citations

0
What Controls the Mesoscale Variations in Water Isotopic Composition Within Tropical Cyclones and Squall Lines? Cloud Resolving Model Simulations in Radiative‐Convective Equilibrium DOI Creative Commons
Camille Risi, Caroline Müller, Françoise Vimeux

et al.

Journal of Advances in Modeling Earth Systems, Journal Year: 2023, Volume and Issue: 15(4)

Published: March 30, 2023

Abstract Water isotopes are tracers of convective processes and often used as proxies for past precipitation. These applications require a better understanding the impact on isotopic composition water vapor One way to advance this is analyze mesoscale variations during organized systems such tropical cyclones or squall lines. The goal study understand these with particular attention signals in near‐surface precipitation that may be present observations paleoclimate proxies. With aim, we run cloud resolving model simulations radiative‐convective equilibrium which rotation wind shear added, allowing us simulate capture robust aspects observed We interpret using simple budget sub‐cloud layer different parts domain. find rain evaporation rain‐vapor diffusive exchanges main drivers depletion within Horizontal advection spreads anomalies, thus reshaping pattern. This contributes our variability provides physical arguments supporting interpretation archives regions terms cyclonic activity.

Language: Английский

Citations

7
Is the Isotopic Composition of Precipitation a Robust Indicator for Reconstructions of Past Tropical Cyclones Frequency? A Case Study on Réunion Island From Rain and Water Vapor Isotopic Observations DOI
Françoise Vimeux, Camille Risi, Christelle Barthe

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(3)

Published: Feb. 1, 2024

Abstract Based on a 6‐year long record (2014–2020) of the isotopic composition rain (δ 18 O p ) at Réunion Island (55°E, 22°S), in South‐West Indian Ocean, this study shows that annual precipitation region is strongly controlled by number cyclones, best‐track days, and proportion cyclonic during year. Our results support use δ annual‐resolved tropical climate archives as reliable proxy past cyclone frequency. The influence arises from systematically more depleted water vapor events than less organized convective systems. analysis daily to hourly v low‐pressure systems reproduction observations AGCMs with global medium coarse resolution (LMDZ‐iso ECHAM6‐wiso) suggest periods stronger depletion mainly both enhanced large‐scale vapor‐rain interactions under humid conditions.

Language: Английский

Citations

2
Abrupt excursions in water vapor isotopic variability at the Pointe Benedicte observatory on Amsterdam Island DOI Creative Commons
Amaëlle Landais, Cécile Agosta, Françoise Vimeux

et al.

Atmospheric chemistry and physics, Journal Year: 2024, Volume and Issue: 24(8), P. 4611 - 4634

Published: April 18, 2024

Abstract. In order to complement the picture of atmospheric water cycle in Southern Ocean, we have continuously monitored vapor isotopes since January 2020 on Amsterdam Island Indian Ocean. We present here first 2-year long isotopic record at this site. show that composition largely follows mixing ratio, as expected marine boundary layers. However, detect 11 periods a few days where there is strong loss correlation between δ18O and ratio well abrupt negative excursions δ18O. These often occur toward end precipitation events. Six these events decrease gaseous elemental mercury, suggesting subsidence air from higher altitude. Our study aims further explore mechanism driving used two different models provide data–model comparison over period. While European Centre Hamburg model (ECHAM6-wiso) 0.9° was able reproduce most sharp excursions, hence validating physics process implementation model, Laboratoire de Météorologie Dynamique Zoom (LMDZ-iso) 2° (3°) resolution only seven (one) highlighting possible influence for such Based our detailed model–data comparison, conclude plausible explanations are rain–vapor interactions associated with rear event.

Language: Английский

Citations

1
Uncovering Below Cloud Rain‐Vapor Interactions During Tropical Rain Events Through Simultaneous and Continuous Real‐Time Monitoring of Rain and Vapor Isotopes DOI Creative Commons
Shaoneng He,

Dominik Jackisch,

Lujia Feng

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(22)

Published: Nov. 12, 2024

Abstract Due to limited water vapor measurements, isotopes have been traditionally estimated under the assumption of isotopic equilibrium between rain and below cloud base. However, recent advancements in analytical instruments allow more measurements that challenged this assumption. To enhance our understanding rain‐vapor interactions base tropical regions, we established an automated system measure simultaneously continuously real time at minute intervals Singapore. Among 324 events monitored from 2016 2019, 81% exhibited a substantial departure expected equilibrium. This suggests raindrop evaporation plays larger role determining their isotopes. The conclusion is supported by generally lower slopes local meteoric line. Seasonal variations event characteristics indicate changing influences interactions: during monsoons, frequent heavy rainfall maintains relatively high humidity base, favoring equilibrium, whereas inter‐monsoons, light lead pronounced differences. Furthermore, significantly modulated isotope evolution individual events. As progressed, reduced favored evaporation, increasing values decreasing its d‐excess, decreased d‐excess increased. Our study introduces new approach capturing real‐time high‐resolution understand dynamics Findings underscore crucial these influencing

Language: Английский

Citations

1
Variation of stable isotope signals in precipitation during Typhoon In-Fa (2021), Eastern China DOI
Sifan Chen,

Yunyue Yang,

Xiuyang Jiang

et al.

Hydrological Sciences Journal, Journal Year: 2024, Volume and Issue: 69(8), P. 1130 - 1139

Published: May 15, 2024

High-resolution stable isotope records of precipitation are crucial for our understanding about the mechanism variations during typhoon events. Here we present hourly-resolution time series Typhoon In-Fa (2021) in Kunshan and Yangzhou, located lower reaches Yangtze River Eastern China. Precipitation δ18O Yangzhou ranged from -1.3‰ to -12.3‰ -2.8‰ -17.1‰, respectively. Both have shifted more negative values as approached. The evolution is likely caused by a combination Rayleigh distillation microphysical processes. than those with lag approximately 14 hours. This was mainly controlled further continuous rainout processes movement higher condensation efficiency. study improves underlining mechanisms changes precipitation.

Language: Английский

Citations

0
Monitoring Heavy Rainfall Events in East Asia Using High‐Resolution Isotopic Observations DOI Creative Commons
Tao Xu, Hongxi Pang, Shuangye Wu

et al.

Journal of Geophysical Research Atmospheres, Journal Year: 2024, Volume and Issue: 129(22)

Published: Nov. 12, 2024

Abstract It is important to understand the mechanisms of heavy rainfall events, as such information could improve forecasting these events and help mitigate their adverse impacts on life property. In this study, we analyzed hourly stable isotopic compositions in water vapor ( δ 18 O v d‐excess ) during summer monsoon season (June September) from 2013 2023 Nanjing, eastern China. These data were extracted longest set high‐resolution continuous situ observations isotopes globally. Based data, identified four evolution patterns corresponding different weather systems: slow‐declining (tropical cyclone interacting with mid‐ high‐latitude system), W‐shaped cyclone), U‐shaped (cold vortex inclined L‐shaped (upper‐level trough system). The variations suggest that China mainly sustained by moisture adjacent oceans (including South Sea East Sea) terrestrial environment rather than distant Indian Ocean previously suggested. addition, for some an intermittent period, nearby oceanic transport alters before after period due intensity change or overall transition low‐level systems. This study serves a benchmark tracing processes Asia using isotopes.

Language: Английский

Citations

0
Stable isotope tempestology of tropical cyclones across the North Atlantic and Eastern Pacific Ocean basins DOI Creative Commons
Ricardo Sánchez‐Murillo, Dimitris A. Herrera, Kegan K. Farrick

et al.

Annals of the New York Academy of Sciences, Journal Year: 2024, Volume and Issue: unknown

Published: Dec. 19, 2024

Abstract Tropical cyclones (TCs) are one of the major natural hazards to island and coastal communities ecosystems. However, isotopic compositions TC‐derived precipitation (P) in surface water (SW) groundwater (GW) reservoirs still lacking. We tested three main assumptions isotope storm “spike” hypothesis (sudden spikes ratios). Our database covers 40 TCs is divided into recent ( N = 778; 2012–2023) archived 236; 1984–1995) rainfall observations SW/GW monitoring 6013; 2014–2023). Seasonal contribution from ranged less than 1% over 54% (4% on average) between 1984 2023. Mean δ 18 O across domains were significantly lower regional (noncyclonic) mean (−5.24 ± 4.27‰): maritime (−6.29 3.28‰), (−7.78 4.28‰), inland (−9.80 5.18‰) values. Coastal TC convection resulted large amounts with high compositions. This could bias past climate reconstructions toward unrealistic drier conditions. Significant d ‐excess differences found intensities. P/SW P/GW ratios revealed rapid propagation excursions freshwater systems. findings highlight potential for diagnosing intensity frequency paleoproxies beyond idealized models.

Language: Английский

Citations

0
Comment on acp-2022-223 DOI Creative Commons
Di Wang, Lide Tian, Camille Risi

et al.

Published: Sept. 30, 2022

Abstract. Stable water isotopes are natural tracers in the hydrological cycle and have been applied hydrology, atmospheric science, ecology, paleoclimatology. However, factors controlling isotopic distribution, both at spatial temporal scales, debated low middle latitude regions, due to significant influence of large-scale circulation complex sources vapor. For first time, we made situ observations near-surface vapor over a large region (over 10 000 km) across China pre-monsoon monsoon seasons, using newly designed vehicle-based isotope monitoring system. Combined with daily multiyear monthly mean outputs from isotope-incorporated global spectral model (Iso-GSM) infrared sounding interferometer (IASI) satellite calculate relative contribution, found that observed variations periods represent mainly seasonal variations, but influenced by more synoptic-scale during period. The δ18O controlled Rayleigh distillation along air mass trajectories period, significantly different moisture sources, continental recycling processes, convection transport Thus, North–South gradient period is counteracted variation reflects summer convective precipitation southern dependence on temperature North. d-excess reflect recycling. Iso-GSM successfully captures distribution performance weaker maybe underestimation local or short-term high-frequency synoptic variations. These results provide an overview variability composition East Asia their factors, they emphasize need interpret proxy records context regional

Language: Английский

Citations

0