Corrected UK'37 and SST estimates of ODP Site 145-883

The gas chromatography chemical ionization mass spectrometry (GC-CI-MS) technique used to generate the 5.7 million year alkenone sea surface temperature (SST) dataset from ODP Site 145-882 introduced a systematic bias into the SST data, an issue that was characterized subsequently to the generation of the ODP Site 145-882 alkenone dataset (Chaler et al. 2000, doi:10.1021/ac001014q; 2003, doi:10.1016/S0021-9673(03)01188-9; Haug et al, 1995). The dataset archived here is a corrected version of the ODP Site 145-882 alkenone SST record that more closely agrees with published GC-FID data (Haug et al, 2005, doi:10.1038/nature03332; Martinez-Garcia et al., 2010, doi:10.1126/Science.1184480; Novak et al. 2024, doi:10.1038/s41561-024-01500-7; Studer et al, 2012, doi:10.1016/j.epsl.2012.07.029). The correction introduced larger uncertainties in the SSTs than is typical in alkenone sea surface temperature reconstructions. Because we lack instrument-specific information about the ionization efficiencies of the alkenone homologues on the GC-CI-MS used by Haug et. al (1995) to generate the ODP 145-882 alkenone SST dataset, we could not use the equations of Chaler et al. (2003, doi:10.1016/S0021-9673(03)01188-9) to correct their record. Instead, we used a simple linear regression between proximal samples of Haug et al. (1995) and Studer et al. (2012, doi:10.1016/j.epsl.2012.07.029), who used the more typical gas chromatography flame ionization detector (GC-FID) technique. The standard error of this relationship (2.5°C) was added to the uncertainty in BAYSPLINE alkenone SST estimates in quadrature.