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PalEON-Project / stepps-baconizing

Data, code, and output from the Bacon age-depth models developed for use in the STEPPS prediction runs.
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varve record depths #23

Open andydawson opened 7 years ago

andydawson commented 7 years ago

In light of learning that sometimes depth represents varve age, we need to be careful about what we do with the varve sites. It looks like how depths and ages are reported in the geochronology table varies for varve cores. In the UMW, we currently have several varve records:

  1. Ruby
  2. Mina
  3. Hell's Kitchen
  4. Lasalle
  5. Lake of the Clouds (multiple?)

Will check on these and report what we are doing with each one shortly.

andydawson commented 7 years ago

So half of these cores have no depths. Not sure if this is in the original data, but we should check because some of these would be really great to include. Another option would be to include them without any uncertainty (or to do some post-hoc thing were we of add uncertainty). I especially want Lake Mina in the prediction data set. Will check the paper shortly.

  1. Ruby (2309) - no depths, only varve years.
  2. Mina (14839) - no depths, only varve years.
  3. Hell's Kitchen (3131) - no depths, only varve years.
  4. LaSalle (15270) - looks like the depths are actually depths. Build and age depth model using depths and varve years.
  5. Lake of the clouds (1649) - build an age-depth model using depths and ages derived from other chronology. It's not perfect, but hopefully the uncertainty will take that into account.
  6. Lake of the clouds (3483) - build an age-depth model using depths and varves ages.
andydawson commented 7 years ago

OK, well I just realized that the thickness is for lake Mina is also in varve years. Maybe this also needs a flag - I also assumed this was in cm. @SimonGoring can you confirm that thickness is in cm except for varved cores? Lake Mina does not appear to have depths, at least that I can find. I am sort of confused, how would you determine accumulation rate without this? Or maybe that is something that is not always of interest?

andydawson commented 7 years ago

On the November 23 phone call we collectively decided to include varves without depths as having no uncertainty. I will still fit the models for varves with depths and include those with uncertainty.