Contribution of recycled moisture to precipitation in oases of arid central Asia: A stable isotope approach

Wang, Shengjie; Zhang, Mingjun; Che, Yue; Chen, Fenli; Fang, Qiang

doi:10.1002/2015wr018135

Cited by 117 publications

(79 citation statements)

References 53 publications

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“…In addition, the convective processes of the vortex also mean that locally recycled vapor may contribute more to precipitating vapor in atmosphere, and local moisture is usually isotopically depleted. Although the regional background is arid, the recycled moisture contributed from oases cannot be ignored [ Wang et al ., ; Li et al ., ] and the lakes of Eastern Kazakhstan may also contribute.…”

Section: Resultsmentioning

confidence: 99%

“…In 2012, a 23‐station network for the measurement of stable isotopes in precipitation was established around the Tianshan Mountains in central Asia [ Wang et al ., ]. Recently, the regime of below‐cloud evaporation [ Wang et al ., ] and moisture recycling [ Wang et al ., ] in arid central Asia was assessed based on this event‐based database. This network provides a good platform to detect the impact of moisture source variation on stable isotopes in precipitation.…”

Section: Introductionmentioning

confidence: 99%

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The effect of moisture source and synoptic conditions on precipitation isotopes in arid central Asia

et al. 2017

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The stable isotope composition of precipitation has been widely applied to trace moisture sources. In the westerly dominated areas of central Asia, the isotopic composition of precipitation significantly correlates with surface air temperature, and the temperature effect is widely accepted. However, the significance of isotopes in tracing water vapor source is not clear for this region, and a further investigation using event‐based observations is still needed. Based on a network around the Tianshan Mountains, the westerly regime of precipitation isotopes is investigated. Although the seasonality of precipitation isotopes for the northern and southern basins of the Tianshan Mountains is similar, the more arid climate and leeward landform of the southern basin lead to weak moisture transport and relatively enriched oxygen isotopes. Of the synoptic systems resulting in heavy precipitation, the central Asian vortex more commonly leads to depleted isotopic ratios in precipitation, which is related to the contribution of northerly moisture and/or surface moisture. The specific humidity‐adjusted Lagrangian diagnostic indicates that the heavy precipitation on the southern basin stations usually has relatively local moisture sources in this arid climate and that terrestrial moisture evaporated from Europe and central Asia, rather than marine moisture from the Atlantic Ocean, is more likely to be the direct moisture source. A sensitivity analysis for target height and adjusting threshold of specific humidity is also applied to the improved Lagrangian diagnostic. Overall, the findings were unaffected by different conditions, and the moisture was more likely to be locally sourced, as indicated by higher specific humidity thresholds.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of moisture source and synoptic conditions on precipitation isotopes in arid central Asia

et al. 2017

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“…They found that the precipitation recycling process is strong in western China, especially the Tibetan plateau and the surrounding areas, while being weaker in Southeast China due to the influence of summer monsoon. At large oases of Urumqi region of NW, the proportional contribution of recycled moisture to local precipitation is approximately 16.2% (Wang et al ., ). Some studies found that glacial retreat over the NW has increased significantly since the 1990s due to climate warming, and the increased glacial melt water has led to an increase in river runoff (Li et al ., ; Yao et al ., ).…”

Section: Introductionmentioning

confidence: 99%

The characteristics of moisture recycling and its impact on regional precipitation against the background of climate warming over Northwest China

Ding

Liu

et al. 2019

Intl Journal of Climatology

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From 1961 to 2015, annual and seasonal precipitation have shown a significant increase over Northwest China (NW). The change of precipitation is a combination result of the changing recycling precipitation (Pw) contributed by local evapotranspiration (ET) and changing precipitation contributed by advection moisture (Po). In this paper, we calculated the ET based on the observation data of meteorological stations and the complementary relationship model. Then used an improved precipitation recycling model to analyse influential factors on the variation of precipitation over the NW from aspects of ET and advection moisture. The annual precipitation recycling ratio (ρ) fluctuates between 4% and 10% and shows an increasing trend at a rate of 0.3% /10a with a significance level of 0.01. ET, which is the internal supplier of the precipitable water, and advection moisture, which is the outside supplier of the precipitable water, both have displayed significantly increasing trends over the NW. The advection moisture contributes precipitation much more than ET, no matter in the annual scale or seasonal scales. In view of the spatial distribution, Pw shows an increasing trend over the whole NW, but distinctly opposite spatial patterns of Po are found between the western area of NW (WNW) and the eastern area of NW (ENW). Such differences caused the precipitation is characterized by a wetting trend in WNW but a drying trend in ENW.

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“…Stable isotopes (δ 18 O and δ 2 H) in precipitation provide important source signatures of different components of the hydrological cycle, including reevaporation (Salamalikis, Argiriou, & Dotsika, 2016;Wang, Zhang, Che, Zhu, & Liu, 2016), precipitation (Rahul, Ghosh, Bhattacharya, & Yoshimura, 2016;Wang, Zhang, Che, Chen, & Qiang, 2016), and moisture sources (Rangarajan, Laskar, Bhattacharya, Shen, & Liang, 2017;Strong, Sharp, & Gutzler, 2007). Global δ 18 O and δ 2 H levels in precipitation are monitored by the International Atomic Energy Agency to identify the relationship between atmospheric processes and isotopic signals in water vapour and precipitation (Angert, LEE, & Yakir, 2008;Jacob & Sonntag, 1991).…”

Section: Introductionmentioning

confidence: 99%

Stable isotopes of atmospheric water vapour and precipitation in the northeast Qinghai‐Tibetan Plateau

Zhang³

et al. 2019

Hydrological Processes

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Stable water isotopes (δ18O and δ2H) are an important source signature for understanding the hydrological cycle and altered climate regimes. However, the mechanisms underlying atmospheric water vapour isotopes in the northeast Qinghai‐Tibetan Plateau of central Asia remain poorly understood. This study initially investigated water vapour isotopic composition and its controls during the premonsoon and monsoon seasons. Isotopic compositions of water vapour and precipitation exhibited high variability across seasons, with the most negative average δ18O values of precipitation and the most positive δ18O values of water vapour found during the premonsoon periods. Temperature effect was significant during the premonsoon period but not the monsoon period. Both a higher slope and intercept of the local meteoric water line were found during the monsoon period as compared with in the premonsoon period, suggesting that raindrops have been experienced a greater kinetic fractionation process such as reevaporation below the cloud during the premonsoon periods. The δ2H and δ18O signatures in atmospheric water vapour tended to be depleted with the occurrence of precipitation events especially during the monsoon period and probably as a result of rainout processes. The monthly average contribution of evaporation from the lake to local precipitation was 35.2%. High d‐excess values of water vapour were influenced by the high proportion of local moisture mixing, as indicated by the gradually increasing relative humidity along westerly and Asian monsoon trajectories. The daily observation (observed ε) showed deviations from the equilibrium fractionation factors (calculated ε), implying that raindrops experienced substantial evaporative enrichment during their descent. The average fraction of raindrops reevaporation was estimated to be 16.4± 12.9%. These findings provide useful insights for understanding the interaction between water vapour and precipitation, moisture sources, and help in reconstructing the paleoclimate in the alpine regions.

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Contribution of recycled moisture to precipitation in oases of arid central Asia: A stable isotope approach

Cited by 117 publications

References 53 publications

The effect of moisture source and synoptic conditions on precipitation isotopes in arid central Asia

The effect of moisture source and synoptic conditions on precipitation isotopes in arid central Asia

The characteristics of moisture recycling and its impact on regional precipitation against the background of climate warming over Northwest China

Stable isotopes of atmospheric water vapour and precipitation in the northeast Qinghai‐Tibetan Plateau

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