NOAA/WDS Paleoclimatology - ITASE 00-1,WAIS Divide WDC05A,WAIS Divide WDC05Q - Snow Accumulation Data

Ice cores collected in 2000 (ITASE 00-1) and 2005 (WDC05A, WDC05Q) from the West Antarctic Ice Sheet Divide (WAIS Divide) project site were used to investigate the spatial and temporal variability in accumulation. The ice cores were dated based on annual layer counting of multiple glaciochemical measurements resulting in bottom depth ages for WDC05A, WDC05Q, and ITASE 00-1 of 1775, 1521, and 1653 A.D., with mean annual accumulation rates of 0.200, 0.204, and 0.221 mweq a−1, respectively. Small-scale spatial variability (SSV) was determined using an analysis of variance of accumulation in the ice core array, thereby quantifying the uncertainty in individual accumulation records. Results indicate that the spatial variability was 0.030 mweq a−1, or approximately 15% of the average annual accumulation. An accumulation record representative of the WAIS Divide local area over recent centuries was developed using a principal component analysis to identify the coherent accumulation signal. The WAIS Divide local record exhibited 14% interannual variability (1 standard deviation of the mean) with the SSV reduced to 0.017 mweq a−1. Correlations of the WAIS Divide local accumulation record with atmospheric indices (e.g., Antarctic Oscillation) exhibited periods when the records oscillate in and out of phase. Thus, reconstructing local and global atmospheric indices from WAIS Divide accumulation records over recent centuries may prove problematic.

本存档古气候学研究可通过美国国家海洋和大气管理局（NOAA）下属的国家环境信息中心（NCEI）获取，该中心隶属于古气候学世界数据服务（WDS）。相关的NCEI研究类型为冰芯（Ice Core）。数据包含地理位于南极洲的冰芯参数。时间覆盖范围为距今（calendar years before present，BP）前429年至-54年。参数及研究地点详情请参见元数据信息。使用数据时请引用本研究。