The Seasonally Altered Atmosphere Moisture Circulations With Rainfall and Rainfall Isotopes in Southwest China
The Seasonally Altered Atmosphere Moisture Circulations With Rainfall and Rainfall Isotopes in Southwest China
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DOI：
10.3389/feart.2022.795857
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发表时间：
2022-02
期刊：
影响因子：
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通讯作者：
Jingyao Zhao;L. Tan;Dong Li;C. Pérez-Mejías;Xiyu Dong;Jian Wang;Haiwei Zhang;Hai Cheng
中科院分区：
文献类型：
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作者：
Jingyao Zhao;L. Tan;Dong Li;C. Pérez-Mejías;Xiyu Dong;Jian Wang;Haiwei Zhang;Hai Cheng
为了解释降水/洞穴δ18O的气候信号，确定影响降水δ18O的因素的重要性至关重要。本研究提供了2015年11月至2016年10月（“超厄尔尼诺”事件）中国西南神器洞遗址降水δ18O和δD的新稳定同位素数据，以研究区域尺度气候对降水δ18O的强迫。降水δ18O、δD和d-excess具有明显的季节性，雨季较低，旱季较高。对季节性变化的LMWL和水分环流的进一步分析表明，至少在季节时间尺度上，大气水分环流的变化将是我们研究区降水/洞穴δ18O波动的关键因素。结合IsoGSM δ18O、GPCP/CRU降雨量和NCEP/NCAR水汽通量的季月变化，我们发现2016年的超厄尔尼诺现象改变了研究区通过西太平洋副热带高压的雨季月降雨量分布，但主要改变了研究区的降水同位素组成和水汽环流。
To interpret the climatic signals of precipitation/speleothem δ18O, it is critical to identify the importance of the factors affecting the precipitation δ18O. This study presents new stable isotope data for precipitation δ18O and δD in the site of Shenqi cave, southwest China, from November-2015 to October-2016 (the “Super-El Niño” event), to investigate the regional-scale climate forcing on precipitation δ18O. The precipitation δ18O, δD and d-excess have an obvious seasonality, relatively low values in the wet season and high in the dry season. The further analysis of seasonally altered LMWL and moisture circulations suggested that changes in atmosphere moisture circulations would be the key factor underlying the precipitation/speleothem δ18O fluctuations in our study area at least on seasonal timescales. Combined with the seasonal-monthly variations of the IsoGSM δ18O, GPCP/CRU rainfall and NCEP/NCAR moisture fluxes, we detected that the super-El Niño of 2016 have changed the distributions of monthly rainfall in wet season through the Western Pacific Subtropical High, but not mainly the precipitation isotopic compositions and moisture circulations in our study area.