Effect of precipitation seasonality on annual oxygen isotopic composition in the area of spring persistent rain in southeastern China and its paleoclimatic implication

Zhang, Haiwei; Cheng, Hai; Cai, Yanjun; Spötl, Christoph; Sinha, Ashish; Kathayat, Gayatri; Li, Hanying

This study examines the seasonality of precipitation amount and inline-formulaδ18O over the monsoon region of China (MRC). We found that the precipitation amount associated with the East Asian summer monsoon (EASM) in the spring persistent rain (SPR) region is equivalent to that of the nonsummer monsoon (NSM). The latter contributes inline-formula∼50 % to amount-weighted annual inline-formulaδ18O values, in contrast with other areas in the MRC, where the inline-formulaδ18O of annual precipitation is dominated by EASM precipitation. Interannual relationships between the El Niño–Southern Oscillation (ENSO) index, simulated inline-formulaδ18O data from IsoGSM, and seasonal precipitation amount in the SPR region were also examined. We found that on interannual timescales, the seasonality of precipitation amount (EASM inline-formula∕ NSM ratio) was modulated by ENSO and primarily influences the variability of amount-weighted annual precipitation inline-formulaδ18O values in the SPR region, although integrated regional convection and moisture source and transport distance may also play subordinate roles. During El Niño (La Niña) phases, less (more) EASM and more (less) NSM precipitation leading to lower (higher) EASM inline-formula∕ NSM precipitation amount ratios results in higher (lower) amount-weighted annual precipitation inline-formulaδ18O values and, consequently, in higher (lower) speleothem inline-formulaδ18O values. Characterizing spatial differences in seasonal precipitation is, therefore, key to correctly interpreting speleothem inline-formulaδ18O records from the MRC.

Zitieren

Zitierform:

Zhang, Haiwei / Cheng, Hai / Cai, Yanjun / et al: Effect of precipitation seasonality on annual oxygen isotopic composition in the area of spring persistent rain in southeastern China and its paleoclimatic implication. 2020. Copernicus Publications.

Zugriffsstatistik

Gesamt:
Volltextzugriffe:
Metadatenansicht:
12 Monate:
Volltextzugriffe:
Metadatenansicht:

Grafik öffnen

Rechte

Rechteinhaber: Haiwei Zhang et al.

Nutzung und Vervielfältigung:

Export