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TraCE-21K Data Processing and Usage FAQ

 

FAQ1-Time coordinates: How do I interpret the time coordinate in the files?

Time unit: ka BP: thousands of years before present

0 ka BP is 1950AD

A negative sign is added to the time coordintes to plot the evolution of the data from left to right. -22 stands for 22 ka BP (22 thousand years before 1950AD); 0.05 stands for -0.05 ka BP (0.050 thousand years after 1950AD), which is 2000AD

There are 2205 decades in the decadal mean data spanning 22 ka BP and 2000AD

There are 264600 months in the monthly mean data spanning 22 ka BP and 2000AD

FAQ2-Simulation Outputs: How do I interpret the variables in the files?

Complete list of CCSM3 TraCE simulation fields

Full metadata of TraCE atmosphere output

Full metadata of TraCE ocean output

Full metadata of TraCE sea ice output

Full metadata of TraCE land output

Full metadata of TraCE dynamic global vegetation output

Sample plots of atmosphere fields

FAQ3-units of PRECT: How do I interpret the units of PRECIPITATION RATE (PRECT) in the files?

For precipitation rate (PRECT), the SI unit is m/s. 1 m/s roughly equals 1000*86400 mm/day, 1000*86400*30 mm/month, or 1000*86400*365 mm/year (3.15e+10 mm/year). For example, 5e-9 m/s is roughly 157.5 mm/year

FAQ4-Single Forcing Simulations: Are there single-forcing simulations for Version 2 of TRACE-21K (TRACE-21K-II)?

Since both TRACE-21K-II and TRACE-21K-I use the same GHG, orbital, and ice sheet forcing, these three single-forcing runs should be applicable to both TRACE-21K-II and TRACE-21K-I

Since the FWF forcing differs between TRACE-21K-II and TRACE-21K-I starting at 14.35 ka, the single-forcing FWF run should be applicable to TRACE-21K-II from 19 ka to 14.35 ka

FAQ5-DGVM: How do I interpret and use the PFT and FPCGRID variables?

Answer (link)

Answer (PDF)

Additional Resources: CLM-DGVM Technical description and user's guide (Levis et al., 2004)