To evaluate the applicability of the Standardized Precipitation-Evapotranspiration Index(SPEI) and the self-calibrated Palmer Drought Severity Index(sc PDSI) to paleoclimate reconstructions in the east Asian summer mo...To evaluate the applicability of the Standardized Precipitation-Evapotranspiration Index(SPEI) and the self-calibrated Palmer Drought Severity Index(sc PDSI) to paleoclimate reconstructions in the east Asian summer monsoon region, we used a 194-year tree-ring width chronology from Guancen Mountain, Shanxi Province,China, to investigate its correlation with SPEI and sc PDSI,respectively. The results indicated sc PDSI as a robust drought index that could be reconstructed from tree-ring width on Guancen Mountain. Significant correlations with other hydroclimate-related series illustrated that our reconstruction captured common variations of hydroclimate in the surrounding areas. Additionally, our reconstructionshowed significant correlation with nearby grid points of the Monsoon Asia Drought Atlas(MADA). However,while unprecedented drying trend existed during the past several decades in MADA, it was not represented in our reconstruction or in instrumental sc PDSI/Dai-PDSI. This may imply that MADA overestimated drought severity during the past several decades in our study area; this overestimation was probably caused by an insufficient spatiotemporal distribution of the tree-ring network used by MADA. Therefore, more drought reconstructions based on individual sampling sites in eastern Asia are necessary to gain a thorough understanding of the Asian Monsoon climate variability.展开更多
基金supported by the National Natural Science Foundation of China(41201046,40890051),KZZDEW-04-01the State Key Laboratory of Loess and Quaternary Geology(SKLLQG),and the West Doctoral Foundation of Chinese Academy of Sciences.This is a SISTRR contribution(No.29)
文摘To evaluate the applicability of the Standardized Precipitation-Evapotranspiration Index(SPEI) and the self-calibrated Palmer Drought Severity Index(sc PDSI) to paleoclimate reconstructions in the east Asian summer monsoon region, we used a 194-year tree-ring width chronology from Guancen Mountain, Shanxi Province,China, to investigate its correlation with SPEI and sc PDSI,respectively. The results indicated sc PDSI as a robust drought index that could be reconstructed from tree-ring width on Guancen Mountain. Significant correlations with other hydroclimate-related series illustrated that our reconstruction captured common variations of hydroclimate in the surrounding areas. Additionally, our reconstructionshowed significant correlation with nearby grid points of the Monsoon Asia Drought Atlas(MADA). However,while unprecedented drying trend existed during the past several decades in MADA, it was not represented in our reconstruction or in instrumental sc PDSI/Dai-PDSI. This may imply that MADA overestimated drought severity during the past several decades in our study area; this overestimation was probably caused by an insufficient spatiotemporal distribution of the tree-ring network used by MADA. Therefore, more drought reconstructions based on individual sampling sites in eastern Asia are necessary to gain a thorough understanding of the Asian Monsoon climate variability.
