14c dating groundwater
This post is inspired by a real-life issue I'm dealing with, and there are so many possibilities, I figured it would make a great early August chew toy for the group. If our global civilization isn't going to shatter under the strain of increasingly weird weather, it's going to need to massively adapt.
Groundwater is an increasingly important water resource in arid or semi-arid regions, as well as a conjunctive resource in humid environments.Because of the long residence time for groundwater in the hydrologic cycle, the last few decades have seen expanding study of groundwater systems.It is therefore important to continually refine our interpretation of hydrogeologic, geochemical and isotopic data to better understand the spatial and temporal movement of water in the subsurface.Groundwater recharge is often difficult to quantify because of its spatial and temporal variability and because of the challenges of measuring it directly. However, recharge estimates are an important component of water budgets developed to accurately assess groundwater availability. Fill the bottle with as little head space as possible but leave the neck of the bottle empty to allow for any expansion during shipment.5.
Place a tape seal around the cap/bottle joint to prevent exchange or loss of CO2 from the water.– Please mark the bottle with the appropriate sample identification number in indelible ink or on a non-removable tamper-proof label.– Measure the p H upon collection and send the info to us (not required).– There is no need to refrigerate stored water samples.– Do not add any chemicals to the water upon collection.
(DIC: measured, carb: carbonate dissolved (0‰), soil: soil air (-23‰) this simple model is also only strictly valid for closed conditions and does not take into account fractionation effects (low p H environments) more complex models taking into account the chemical and isotopic evolution have been developed (e.g.
H containing recharge water, up to 31 ka for groundwater with Holocene stable isotope signatures and 6–10 ka for groundwater at 35 m depth.
GWRP supports efforts to evaluate the use of groundwater age data to improve our overall understanding of recharge and thereby improve groundwater availability studies through the following activities: Groundwater samples will be collected and analyzed to fill important data gaps in existing groundwater availability studies and to demonstrate age-dating techniques that could be used in future studies to understand recharge conditions.
R., 2011, A comparison of recharge rates in aquifers of the United States based on groundwater-age data: Hydrogeology Journal, DOI 10.1007/s10040-011-0722-5 For more information about this project, contact: Peter B.
Depending on the depth of the well, this may be several minutes or longer.3.