Is the isotopic composition of event based precipitation driven by moisture source or synoptic scale weather in the Sydney Basin, Australia?

Crawford, Jagoda; Hughes, Catherine E.; Parkes, Stephen

doi:10.1016/j.jhydrol.2013.10.031

Cited by 84 publications

(106 citation statements)

References 58 publications

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“…The same feature has been reported for Irish (Dublin) precipitation in northwestern Europe (Baldini et al, 2010). The results of observation in southern Australia revealed the close relationship of isotopes in precipitation to the prevailing synoptic scale weather pattern (Treble et al, 2005;Simmonds, 2008, 2009;Crawford et al, 2013). These results demonstrate that isotopic variability in individual local precipitation is closely related to the synoptic scale meteorological conditions.…”

Section: Atmospheric Circulation Controls On the Isotopic Compositionsupporting

confidence: 81%

East Asian Monsoon controls on the inter-annual variability in precipitation isotope ratio in Japan

et al. 2015

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Abstract. To elucidate the mechanism for how the East Asian Monsoon (EAM) variability have influenced the isotope proxy records in Japan, we explore the primary driver of variations of precipitation isotopes at multiple temporal scales (event, seasonal and inter-annual scales). Using a new 1-year record of the isotopic composition of event-based precipitation and continuous near-surface water vapor at Nagoya in central Japan, we identify the key atmospheric processes controlling the storm-to-storm isotopic variations through an analysis of air mass sources and rainout history during the transport of moisture to the site, and then apply the identified processes to explain the inter-annual isotopic variability related to the EAM variability in the historical 17-year long Tokyo station record in the Global Network of Isotopes in Precipitation (GNIP).In the summer, southerly flows transport moisture with higher isotopic values from subtropical marine regions and bring warm rainfall enriched with heavy isotopes. The weak monsoon summer corresponds to enriched isotopic values in precipitation, reflecting higher contribution of warm rainfall to the total summer precipitation. In the strong monsoon summer, the sustaining Baiu rainband along the southern coast of Japan prevents moisture transport across Japan, so that the contribution of warm rainfall is reduced. In the winter, storm tracks are the dominant driver of storm-to-storm isotopic variation and relatively low isotopic values occur when a cold frontal rainband associated with extratropical cyclones passes off to the south of the Japan coast. The weak monsoon winter is characterized by lower isotopes in precipitation, due to the distribution of the cyclone tracks away from the southern coast of Japan. In contrast, the northward shift of the cyclone tracks and stronger development of cyclones during the strong monsoon winters decrease the contribution of cold frontal precipitation, resulting in higher isotopic values in winter precipitation. Therefore, year-to-year isotopic variability in summer and winter Japanese precipitation correlates significantly with changes in the East Asian summer and winter monsoon intensity (R = −0.47 for summer, R = 0.42 for winter), and thus we conclude that the isotope proxy records in Japan should reflect past changes in the East Asian Monsoon. Since our study identifies the climate drivers controlling isotopic variations in summer and winter precipitation, we highlight the retrieval of a record with seasonal resolution from paleoarchives as an important priority.

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Section: Atmospheric Circulation Controls On the Isotopic Compositionsupporting

confidence: 81%

East Asian Monsoon controls on the inter-annual variability in precipitation isotope ratio in Japan

et al. 2015

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“…The variability in δ 18 O and δ 2 H is also supported by the synoptic weather conditions and the presence of ECL and westerly precipitation systems as found by Crawford et al (2013). The influence of heterogeneity becomes more significant with depth as is confirmed by variation in chloride concentration (Fig.…”

Section: Hbss -Zonesupporting

confidence: 69%

“…The precipitation weighted δ 18 O for ECL is −11‰ (min of −26‰, max − 4‰ and standard deviation 5.65‰) and for westerly inland trough −6.13‰ (min of −12‰ to 2‰, standard deviation 3.03‰). The study by Crawford et al (2013) found that the synoptic conditions were the important factor in determining the variability of δ 18 O and δ 2 H in rainfall, and the variability was the result of the prevailing weather systems, especially the impact of ECL system vs. the westerly systems, and the distance from the ECL centre. This was considered to have the impact on long term trends of isotopic signal in the Sydney Basin.…”

Section: Water-vapour Stable Isotopic Compositionmentioning

confidence: 99%

“…The knowledge of the modern-day rainfall isotopic composition in the Sydney Basin allows the interpretation of porewater data. The study by Crawford et al (2013) found that δ 18 O value and its variability was dependent on the prevailing weather system and that the large scale rainout during transport had more influence on the δ 18 O than different moisture sources. Rainfall in the Sydney Basin that is sourced from east coast low ECL system has been found to have more depleted arithmetic mean precipitation δ 18 O, shows largest variability in δ 18 O (−4‰ to − 26‰ and standard deviation 5.6%) and deuterium excess (D-excess) compared to other systems, in particular the inland western trough.…”

Section: Introductionmentioning

confidence: 99%

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Direct stable isotope porewater equilibration and identification of groundwater processes in heterogeneous sedimentary rock

David¹,

Timms²,

Baker³

2015

Science of The Total Environment

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“…Sodemann et al, 2008;Crawford et al, 2013;Jouzel et al, 2013), estimating evaporation (e.g. Jasechko et al, 2013Jasechko et al, , 2014 and reconstructing paleoclimate (e.g.…”

Section: Introductionmentioning

confidence: 99%

Factors controlling stable isotope composition of precipitation in arid conditions: an observation network in the Tianshan Mountains, central Asia

Wang¹,

Zhang²,

Hughes

et al. 2016

Tellus B: Chemical and Physical Meteorology

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Is the isotopic composition of event based precipitation driven by moisture source or synoptic scale weather in the Sydney Basin, Australia?

Cited by 84 publications

References 58 publications

East Asian Monsoon controls on the inter-annual variability in precipitation isotope ratio in Japan

East Asian Monsoon controls on the inter-annual variability in precipitation isotope ratio in Japan

Direct stable isotope porewater equilibration and identification of groundwater processes in heterogeneous sedimentary rock

Factors controlling stable isotope composition of precipitation in arid conditions: an observation network in the Tianshan Mountains, central Asia

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