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- Title
Calculating uncertainty for the RICE ice core continuous flow analysis water isotope record.
- Authors
Keller, Elizabeth D.; Baisden, W. Troy; Bertler, Nancy A. N.; Emanuelsson, B. Daniel; Canessa, Silvia; Phillips, Andy
- Abstract
We describe a novel approach to the calibration and uncertainty estimation of a high-resolution continuous flow analysis (CFA) water isotope (δ²H, δ18O) record from the Roosevelt Island Climate Evolution (RICE) Antarctic ice core. Our method establishes robust uncertainty estimates for CFA δ²H and δ18O measurements, comparable to those reported for discrete sample δ²H and δ18O analysis. Data were calibrated using a time-weighted two-point linear calibration with two standards measured both before and after continuously melting three or four meters of ice core. The error at each data point was calculated as the quadrature sum of three factors: Allan variance, scatter over the averaging interval, and general calibration accuracy. Final mean total error for the entire record is δ²H = 0.74 ‰ and δ18O = 0.21 ‰. The quality over the length of the dataset is variable, likely due to a combination of poorer ice quality at lower depths, interruptions in the CFA measurements due to ice breaks and equipment failure, the build-up over time of residual drill fluid, and leaks or valve degradation in the system. Despite the somewhat uneven system performance, this represents a significant achievement in precision of high-resolution CFA water isotope measurement.
- Subjects
ICE cores; ISOTOPIC analysis; CALIBRATION
- Publication
Atmospheric Measurement Techniques Discussions, 2018, p1
- ISSN
1867-8610
- Publication type
Article
- DOI
10.5194/amt-2017-387