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FAQ
Q1: I'm a member of the press and would like more information, to whom do I turn?
Q2: Can I use whatever I find on these pages?
Q3: How do I cite or acknowledge CarbonTracker work?
Q4: What data are available beyond those currently offered through FTP, and how do I get it?
Q5: Why is CarbonTracker almost a year behind the current date?
Q6: How reliable are your products?
Q7: Where can I find more technical details on CarbonTracker?
Q8: I'm having trouble using the CarbonTracker results, where can I get help?
Q9: Are CarbonTracker results available for earlier releases?
Q10: How does CarbonTracker Europe differ from CarbonTracker at NOAA ESRL?

Q1: I'm a member of the press and would like more information, to whom do I turn?
A1: Please contact Baozhang Chen (Chinese Academy of Sciences) to discuss CarbonTracke-China, get the latest carbon cycle insights, or obtain additional material.

Q2: Can I use whatever I find on these pages?
A2: Yes, all our results are free to be used by the public, scientists, and others. This includes all figures, numbers, and data files. We encourage you to contact us with questions to ensure proper representation of the results, and we welcome any feedback and possibility for cooperation. Please acknowledge the CarbonTracker-China efforts when you use them in your scientific endeavors.

Q3: How do I cite or acknowledge CarbonTracker China work?
A3: We ask that scientific work that relies heavily on CarbonTracker China products is discussed with us before publication, to ensure proper representation of our work and a co-authorship if appropriate. For suggestions, go to citation.

Q4: What data are available beyond that currently offered through FTP, and how do I get it?
A4: In addition to the available monthly and yearly global fluxes and China mole fraction time series, we can generate global 1x1 degree biological fluxes at 3-hourly resolution, as well as optimized mole fraction data for any other part of the world. We have time series of estimated fluxes for 100+ FluxNET eddy-covariance sites, optimized CO2 time series for 250+ locations worldwide, and routines to sample column CO2 abundances at other times of day to coincide with satellite overpasses of for instance GoSAT. We also offer the full covariances of our estimated parameters to any interested parties. Please contact us to discuss the sharing of these results.

Q5: Why is CarbonTracker China so far behind the current date?
A5: CarbonTracker China operates with at least a one-year delay. Our next release will update flux estimates through the end of 2010. There are several reasons for this delay, but the most important one is that there is a lag in our receiving observed mole fraction data from around the world, and performing the requisite quality control. This process involves many persons and many hours of meticulous work. As a result, the CO2 mole fraction data for 2010 won't be available for our CarbonTracker China modeling efforts until mid-2011. Preparing the CarbonTracker China product itself requires another two months or so of modeling effort.

While CarbonTracker China results are lagged by a year, subsets of the raw flask and in-situ observations themselves are posted as soon as they are available, even as the quality-control efforts are underway. For the most up-to-date observational data, you can visit our interactive data visualization page at: http://www.esrl.noaa.gov/gmdl/ccgg/iadv/.

Xu: corrected the address.

Q6: How reliable are your products?
A6: The reliability of our products depends on the time and location for which they are assessed. China results will generally be more reliable than those in other parts of the world due to the focus of CarbonTracker on this region. Also, results that are aggregated in space (e.g., whole continents) or time (e.g., monthly averages) will be more robust than local or instantaneous estimates. For the fluxes, formal uncertainty estimates on the biological fluxes (full covariance matrices are available upon request) give some indication of the random errors we expect. However, systematic errors (e.g., biases) might dominate these at specific times and locations. Calculated mole fraction data will generally be reliable to within the specified errors at each site, while mole fractions at other locations will be better constrained in the proximity of assimilated sites. Assessing our products against independent data and quantifying their reliability is an important and ongoing task for the CarbonTracker China team. We welcome any help and assistance, or feedback you might have on this issue. The CarbonTracker China team will generally quote conservative formal uncertainty estimates on all website products.

Q7: Where can I find more technical details on CarbonTracker China?
A7: For technical details beyond the documentation pages, we suggest you read the literature, visit our Collaborators page, see our release notes, or contact us.

Q8: I'm having trouble using the CarbonTracker China results, where can I get help?
A8: Send us an email describing in detail what you are trying to do, and what problem you run into. We will make every attempt to help you along.

Q9: Are CarbonTracker China results available for earlier releases?
A9: Yes. All versions of CarbonTracker China will be archived and made available here.

Q10: How does CarbonTracker China differ from CarbonTracker at NOAA ESRL?
A10: CarbonTracker for North America, Europe and for China are made separately, but collaborating, teams of researchers in the United States, Europe and China. CarbonTracker for North America and Europe were first released in 2007 and 2009, respectively. CarbonTracker Europe was developed from the CT2007B release of CarbonTracker North America and hence should be compared to this older version. CarbonTracker North America is updated each year in October, while CarbonTracker Europe is not on a fixed release schedule.



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