Synoptic-scale variation of δ 18O in summer monsoon rainfall at Lijiang, China

Pang, Hongxi; He, Yuanqing; Lu, Aigang; Zhao, Jian‐xin; Ning, Baoying; Yuan, Lingling; Song, Bo

doi:10.1007/s11434-006-2158-1

Cited by 36 publications

(16 citation statements)

References 26 publications

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“…The depleted δ 18 O values late in the monsoon season were also observed in the other monsoon areas. Pang et al (2006) suggested that the low δ 18 O values were caused by the recycling of monsoon precipitation late in the monsoon season. Breitenbach et al (2010), on the other hand, argued that the Bay of Bengal freshwater plume, consisting of isotopically depleted rainwater and snowmelt water, diluted the Bay of Bengal surface water δ 18 O pool late in the monsoon season.…”

Section: Discussionmentioning

confidence: 99%

Effects of changes in moisture source and the upstream rainout on stable isotopes in precipitation – a case study in Nanjing, eastern China

Tang

Pang

Zhang

et al. 2015

Hydrol. Earth Syst. Sci.

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Abstract. In the Asian monsoon region, variations in the stable isotopic composition of speleothems have often been attributed to the "amount effect". However, an increasing number of studies suggest that the "amount effect" in local precipitation is insignificant or even non-existent. To explore this issue further, we examined the variability of daily stable isotopic composition (δ 18 O) in precipitation from September 2011 to November 2014 in Nanjing, eastern China. We found that intra-seasonal variations of δ 18 O during summer were not significantly correlated with local rainfall amount but could be linked to changes in the moisture source location and rainout processes in the source regions. Our findings suggest that the stable isotopes in summer precipitation could signal the location shift of precipitation source regions in the inter-tropical convergence zone (ITCZ) over the course of the monsoon season. As a result, changes in moisture source location and upstream rainout effect should be taken into account when interpreting the stable isotopic composition of speleothems in the Asian monsoon region. In addition, the temperature effect on isotopic variations in non-monsoonal precipitation should also be considered because precipitation in the non-monsoon season accounts for about half of its annual precipitation.

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Section: Discussionmentioning

confidence: 99%

Effects of changes in moisture source and the upstream rainout on stable isotopes in precipitation – a case study in Nanjing, eastern China

Tang

Pang

Zhang

et al. 2015

Hydrol. Earth Syst. Sci.

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“…The ice in the high altitude area started to melt when the temperature rises up, at the higher altitude, the more depleted d 18 O in the ice. The variation of d 18 O in melt water had close relationship with temperature in the monthly scale (Jiang 2003;Pang et al 2006).…”

Section: The Variation Of the D 18 Omentioning

confidence: 99%

“…1, Yulong Mountain have been studied. Studies have shown that the ocean-glacier area had relatively strong ion leaching, which is not an ideal proxy climate change indicator (Pang et al 2006(Pang et al , 2007Zhu et al 2012Zhu et al , 2013. Previous studies have also provided a general view of the hydrochemical characteristics of typical rivers in Lijiang basin during the wet season in mountains region.…”

Section: Introductionmentioning

confidence: 99%

Variations of chemical features in a monsoon glacier watershed, southeastern Tibet Plateau

Zhu

Liu

et al. 2015

Environ Earth Sci

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The pH, EC (electric conductivity), d 18 O and major ions in melt water, precipitation, runoff and groundwater samples which were collected in Baishui basin were analyzed. Based on chemical analysis, the characteristic variations are analyzed in this paper. The melt water, precipitation, runoff and groundwater were Ca 2? /Mg 2? /HCO 3-type with similar ion compositions but showed different ion concentrations. Normally the content is high in groundwater and runoff water but low in melt water and precipitation. From the upper basin glacier downward, there was a general increasing trend for the total ion concentrations in basin. HCO 3 -and Ca 2? accounted for more than 80 % of total ions in samples, indicating that ions mainly came from limestone and water typical of carbonate solution water. Water-rock interaction is the significant contributor to water geochemistry. The concentration of inorganic ion in melt water had an obvious diurnal variation with temperature change. The d 18 O values increases with the altitude decrease; the similarity of d 18 O in runoff and groundwater samples was due to their frequent transformation in karst regions.

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“…The climate at Lijiang is mainly dominated by the southwesterly summer monsoon (from May to October) and controlled by the southern branch of the westerly jet in winter (from November to the following April) (Pang et al, 2006). During the sampling periods, the climate of Lijiang was controlled by western wind during pre-monsoon and post-monsoon period, and a greater wind speed was observed during post-monsoon period (exceeding 22 m s -1 ) than that during pre-monsoon period (less than 13 m s -1 ) at the level of 500 hPa (Fig.…”

Section: Meteorologymentioning

confidence: 99%

Seasonal Variation, Sources and Transport of Aerosols at Lijiang, Southeast Tibetan Plateau

Cao

Huang

et al. 2016

Aerosol Air Qual. Res.

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Aerosol samples were collected during pre-monsoon, monsoon and post-monsoon periods in 2009 in Lijiang, a tourism city located on the southeast Tibetan Plateau, southwest China. To determine the seasonal variation and sources of aerosol species, main elements and water soluble ions were analyzed. The results showed that crustal elements (Si, K, Ca, Ti and Fe) were the main elements with an enrichment whose enrichment factor (EF) value were lower than 10, with the large value (except Ca) occurring during the pre-monsoon period. The EF values of S, Cl, Zn, As, Br, Sb, Pb, and Cu were higher than those of the crustal elements and the large concentration appeared during the monsoon period. Ca 2+ and SO 4 2-were the dominant cation and anion, respectively. The greatest value of total ionic concentration was found during the monsoon period, mainly because of the high concentration of SO 4 2-and NH 4 + . Using the positive matrix factorization model, it was found that the main sources of species were from crustal source, transport from south Asia and eastern China, local vehicle emissions and sea salt. Further results indicated that the pollutants mixed with dust, anthropogenic pollutants and biomass burning emissions can be transported to Lijiang from south Asia and Southeast Asia during the premonsoon period. In addition, pollutants rich in SO 4 2-and heavy metal from the Sichuan Basin and eastern Yunnan Province can also be occasionally transported to Lijiang during the monsoon period. The seasonal differences in chemical composition and transportation pathway may have important implications for regional climate change.

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Synoptic-scale variation of δ 18O in summer monsoon rainfall at Lijiang, China

Cited by 36 publications

References 26 publications

Effects of changes in moisture source and the upstream rainout on stable isotopes in precipitation – a case study in Nanjing, eastern China

Effects of changes in moisture source and the upstream rainout on stable isotopes in precipitation – a case study in Nanjing, eastern China

Variations of chemical features in a monsoon glacier watershed, southeastern Tibet Plateau

Seasonal Variation, Sources and Transport of Aerosols at Lijiang, Southeast Tibetan Plateau

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