![]() A recent example of the latter is the updated calcium carbonate dissolution study by Sulpis et al. The main reason for the published dataset is to give a user-friendly product that can be applied in ocean studies where ventilation ages are of interest, both to give an appreciation of typical ages and gradients in the ocean, and to be adopted in studies calculating biogeochemical rates. Thus, some care should be taken when utilising the calculated ages in certain regions. This assumption is typically adopted in the global ocean (e.g., Waugh et al., 2006), although there is regional variability (e.g., Stöven and Tanhua, 2014 Rajasakaren et al., 2019). Furthermore, we have assumed a balance between advection and mixing, i.e., unity ratio between the width and the mean age of the TTDs. We assume that the solution to the Greens function is an Inverse Gaussian (IG) function. Our calculated ages are estimated from measured concentrations of the transient tracers’ sulphur hexafluoride (SF6), and the chlorofluorocarbons (CFCs) CFC-11 and CFC-12.įor these TTD calculations we have assumed full (100%) saturation of the transient tracers when subducted, which will generate a bias toward older ages in especially dense water formation regions since it is known that the saturation there is frequently lower than 100%. Ventilation age is defined as the time elapsed since a water parcel was last in contact with the atmosphere. ![]() This NCEI accession contain ventilation ages calculated using the transit time distribution (TTD) method (e.g., Waugh et al., 2004) on the GLODAPv2 data synthesis product (Olsen et al., 2016). NDP-108 (2021) NCEI Accession 0226793, NDP-108 Data and Documentation Files Water mass ages based on GLODAPv2 data product (NCEI Accession 0226793)Įmil Jeansson 1, Reiner Steinfeldt 2 Toste Tanhua 3ġNORCE Norwegian Research Centre, Bjerknes Centre for Climate Research, Bergen, Norway ģGEOMAR Helmholtz Centre for Ocean Research Kiel, Marine Biogeochemistry, Chemical Oceanography Düsternbrooker Weg 20, 24105 Kiel, Germany ĤNational Centers for Environmental Information (NCEI), National Oceanic and Atmospheric Administration (NOAA), Silver Spring, MD, USA. ![]()
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