pmip3:synth:bartlein:index
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pmip3:synth:bartlein:index [2013/12/18 15:34] jypeter More changes to detail the files content |
pmip3:synth:bartlein:index [2014/01/30 13:31] (current) jypeter "References" now appears correctly as a sub-section |
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| - | ====== Continental climate reconstructions for mid-Holocene and Last Glacial Maximum ====== | + | ====== Pollen-based continental climate reconstructions for the mid-Holocene and the Last Glacial Maximum ====== |
| - | ===== Pollen-based continental climate reconstructions for the mid-Holocene and the Last Glacial Maximum ===== | + | ===== Reference ===== |
| <note important>Main reference:\\ \\ **Pollen-based continental climate reconstructions at 6 and 21 ka: a global synthesis**\\ \\ **Bartlein, P. J.**, S. P. Harrison, S. Brewer, S. Connor, B. A. S. Davis, K. Gajewski, J. Guiot, T. I. Harrison-Prentice, A. Henderson, O. Peyron, I. C. Prentice, M. Scholze, H. Seppä, B. Shuman, S. Sugita, R. S. Thompson, A. E. Viau, J. Williams, H. Wu, **2011**. , Climate Dynamics, 37, 775-802.\\ [[http://link.springer.com/article/10.1007%2Fs00382-010-0904-1|DOI 10.1007/s00382-010-0904-1]]</note> | <note important>Main reference:\\ \\ **Pollen-based continental climate reconstructions at 6 and 21 ka: a global synthesis**\\ \\ **Bartlein, P. J.**, S. P. Harrison, S. Brewer, S. Connor, B. A. S. Davis, K. Gajewski, J. Guiot, T. I. Harrison-Prentice, A. Henderson, O. Peyron, I. C. Prentice, M. Scholze, H. Seppä, B. Shuman, S. Sugita, R. S. Thompson, A. E. Viau, J. Williams, H. Wu, **2011**. , Climate Dynamics, 37, 775-802.\\ [[http://link.springer.com/article/10.1007%2Fs00382-010-0904-1|DOI 10.1007/s00382-010-0904-1]]</note> | ||
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| + | ===== Description ===== | ||
| These data are a synthesis of existing and available quantitative reconstructions of six //bioclimatic// variables based on fossil pollen for the mid-Holocene and the Last Glacial Maximum. The reconstructions are expressed as anomalies and associated uncertainties on a 2x2-degree grid. The data were gridded by simple averaging of the reconstructions in individual grid cells, and the uncertainties were obtained by pooling the prediction error estimates of individual reconstructions. No attempt was made to interpolate or fill in empty grid points. | These data are a synthesis of existing and available quantitative reconstructions of six //bioclimatic// variables based on fossil pollen for the mid-Holocene and the Last Glacial Maximum. The reconstructions are expressed as anomalies and associated uncertainties on a 2x2-degree grid. The data were gridded by simple averaging of the reconstructions in individual grid cells, and the uncertainties were obtained by pooling the prediction error estimates of individual reconstructions. No attempt was made to interpolate or fill in empty grid points. | ||
| | Click on the pictures below to download the HIGH resolution pdf || | | Click on the pictures below to download the HIGH resolution pdf || | ||
| - | ^ mid- Holocene ^ Last Glacial Maximum ^ | + | ^ mid-Holocene ^ Last Glacial Maximum ^ |
| | [[https://wiki.lsce.ipsl.fr/pmip3/lib/exe/fetch.php/pmip3:synth:bartlein:qrec_06ka.pdf|{{:pmip3:synth:bartlein:qrec_6ka_xsmall.jpg?nolink}}]] | [[https://wiki.lsce.ipsl.fr/pmip3/lib/exe/fetch.php/pmip3:synth:bartlein:qrec_21ka.pdf|{{:pmip3:synth:bartlein:qrec_21ka_xsmall.jpg?nolink}}]] | | | [[https://wiki.lsce.ipsl.fr/pmip3/lib/exe/fetch.php/pmip3:synth:bartlein:qrec_06ka.pdf|{{:pmip3:synth:bartlein:qrec_6ka_xsmall.jpg?nolink}}]] | [[https://wiki.lsce.ipsl.fr/pmip3/lib/exe/fetch.php/pmip3:synth:bartlein:qrec_21ka.pdf|{{:pmip3:synth:bartlein:qrec_21ka_xsmall.jpg?nolink}}]] | | ||
| Please see the original paper for exact definitions of the time slices used here, the specific approaches used in synthesizing data from multiple sources, and recommendations for the use of the data in data-model comparisons. | Please see the original paper for exact definitions of the time slices used here, the specific approaches used in synthesizing data from multiple sources, and recommendations for the use of the data in data-model comparisons. | ||
| - | The gridded reconstructions are available in two formats (binary and text), with one file per variable and per period: | + | The gridded reconstructions are available in two formats (//binary// and //text//), with one file per variable and per period: |
| - | * binary NetCDF files: ''**variable**_delta_**period**_ALL_grid_2x2.nc'' | + | * //binary// [[http://www.unidata.ucar.edu/software/netcdf/|NetCDF files]]: ''**variable**_delta_**period**_ALL_grid_2x2.nc'' |
| * Note: in the NetCDF files, the grid cells where there are no data sites are masked | * Note: in the NetCDF files, the grid cells where there are no data sites are masked | ||
| - | * text (.csv) files: ''**variable**_delta_**period**_ALL_grid_2x2.csv'' | + | * //text// [[http://en.wikipedia.org/wiki/Comma-separated_values|csv files]]: ''**variable**_delta_**period**_ALL_grid_2x2.csv'' |
| * Note: the text files only list the grid cells that contain data sites | * Note: the text files only list the grid cells that contain data sites | ||
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| ... and the **period**s are: | ... and the **period**s are: | ||
| - | * **06ka**: mid Holocene | + | * **06ka**: mid-Holocene |
| * **21ka**: Last Glacial Maximum | * **21ka**: Last Glacial Maximum | ||
| - | Each file contains the following variables: | + | Each ''**variable**_delta_period_ALL_grid_2x2'' data file contains the following variables: |
| ^ Variable ^ Column\\ (.csv file) ^ Detail ^ | ^ Variable ^ Column\\ (.csv file) ^ Detail ^ | ||
| - | | **lat** | 1 | Latitude of grid-cell center (degrees North) | | + | | **lat** | 1 | \\ Latitude of grid-cell center (degrees North)\\ \\ | |
| - | | **lon** | 2 | Longitude of grid-cell center (degrees East) | | + | | **lon** | 2 | \\ Longitude of grid-cell center (degrees East)\\ \\ | |
| - | | **variable**_anm_mean | 3 | Grid-cell mean of reconstructed anomalies | | + | | **variable**_anm_mean | 3 | \\ Grid-cell mean of reconstructed anomalies\\ \\ | |
| - | | **variable**_se_mean | 4 | Grid-cell mean of standard errors of estimates | | + | | **variable**_se_mean | 4 | \\ Grid-cell mean of standard errors of estimates\\ \\ | |
| - | | **variable**_tstat | 5 | //t-statistic// = mean anomaly / mean standard error of estimate\\ \\ **=** **variable**_anm_mean / **variable**_se_mean | | + | | **variable**_tstat | 5 | \\ //t-statistic// = mean anomaly / mean standard error of estimate\\ \\ **=** **variable**_anm_mean / **variable**_se_mean\\ \\ | |
| - | | **variable**_sig | 6 | Significance of the //t-statistic//: -1, 0, 1\\ \\ **=** sign(**variable**_tstat) if abs(**variable**_tstat) > 2\\ **=** **0** if abs(**variable**_tstat) < = 2 | | + | | **variable**_sig | 6 | \\ Significance of the //t-statistic//: -1, 0, 1\\ \\ **=** sign(**variable**_tstat) if abs(**variable**_tstat) > 2\\ **=** **0** if abs(**variable**_tstat) < = 2\\ \\ | |
| - | | **variable**_sig_value | 7 | Value of //anm_mean// if the //t-statistic// was significant\\ \\ **=** **variable**_anm_mean if **variable**_sig <> 0\\ **=** **0** if **variable**_sig == 0 | | + | | **variable**_sig_value | 7 | \\ Value of //anm_mean// if the //t-statistic// was significant\\ \\ **=** **variable**_anm_mean if **variable**_sig <> 0\\ **=** **0** if **variable**_sig == 0\\ \\ | |
| - | | **variable**_npts | 8 | Number of sites in the grid cell | | + | | **variable**_npts | 8 | \\ Number of sites in the grid cell\\ \\ | |
| - | * variable_anm_mean: grid-cell mean of reconstructed anomalies | ||
| - | * variable_se_mean: grid-cell mean of standard errors of estimates | ||
| - | * variable_tstat: mean anomaly / mean standard error of estimate (anm_mean/se_mean | ||
| - | * variable_sig: = sign(t) if abs(t) > 2 (same for all variables?) | ||
| - | * variable_sig_val: =anm_mean if sig.ne.0 | ||
| - | * variable_npts: number of sites in grid box | ||
| - | <note warning>\\ [[pmip3:synth:bartlein:download|Click here to access the data]]</note> | + | ===== History (changes) ===== |
| - | ===== Extension of the Bartlein et al (2011) reconstructions ===== | + | * The data files distributed on the PMIP3 site have been **updated** (from the files originally used in the Bartlein 2011 paper) in order to correct a few values |
| + | * The three ''variable_delta_period_ALL_grid_2x2**_ex**'' **extended** files have the same data as the corresponding ''variable_delta_period_ALL_grid_2x2'' files, and include additional (unpublished) speleothem data and a few sites from the //Shakun et al. (2012)// appendix and from the //Schmittner et al. (2011)// Science paper. These have been used in the //Harrison et al. (2013) benchmarking// paper. | ||
| + | * **map**_delta_**06ka**_ALL_grid_2x2**_ex**.[csv, nc] | ||
| + | * **mat**_delta_**06ka**_ALL_grid_2x2**_ex**.[csv, nc] | ||
| + | * **mat**_delta_**21ka**_ALL_grid_2x2**_ex**.[csv, nc] | ||
| + | * The additions consist of: | ||
| + | * Last Glacial Maximum, Mean Annual Temperatures: 1 speleothem record and 2 terrestrial records from Shakun et al. | ||
| + | * Mid-Holocene, Mean Annual Temperatures: 3 speleothem records | ||
| + | * Mid-Holocene, Mean Annual Precipitation: 4 speleothem records | ||
| - | <note important>Main reference:\\ \\ Harrison et al?</note> | + | ===== References ===== |
| - | The following files are "extended" files with additional (unpublished) speleothem data and a few sites from the Shakun et al. appendix from the Schmittner et al. (2011) Science paper. These have been used in the Harrison et al. "benchmarking" paper. | + | * **Schmittner, A.**, N. M. Urban, J. D. Shakun, N. M. Mahowald, P. U. Clark, P. J. Bartlein, A. C. Mix, A. Rosell-Melé, 2011. **Climate Sensitivity Estimated from Temperature Reconstructions of the Last Glacial Maximum**. Science, 334, 1385-1388, [[http://www.sciencemag.org/content/334/6061/1385|DOI: 10.1126/science.1203513]] |
| + | * **Shakun, J. D.**, P. U. Clark, F. He, S. A. Marcott, A. C. Mix, Z. Liu, B. Otto-Bliesner, A. Schmittner and E. Bard, 2012. **Global warming preceded by increasing carbon dioxide concentrations during the last deglaciation**, Nature, 484, 49-55, [[http://www.nature.com/nature/journal/v484/n7392/full/nature10915.html|DOI:10.1038/nature10915]] | ||
| + | * **Harrison, S. P.**, P. J. Bartlein, S. Brewer, I. C. Prentice, M. Boyd, I. Hessler, K. Holmgren, K. Izumi, K. Willis, 2013. **Climate model benchmarking with glacial and mid-Holocene climates**. Climate Dynamics, [[http://link.springer.com/article/10.1007%2Fs00382-013-1922-6|DOI 10.1007/s00382-013-1922-6]] | ||
| - | * map_delta_06ka_ALL_grid_2x2_ex.csv | ||
| - | * mat_delta_06ka_ALL_grid_2x2_ex.csv | ||
| - | * mat_delta_21ka_ALL_grid_2x2_ex.csv | ||
| - | * map_delta_06ka_ALL_grid_2x2_ex.nc | ||
| - | * mat_delta_06ka_ALL_grid_2x2_ex.nc | ||
| - | * mat_delta_21ka_ALL_grid_2x2_ex.nc | ||
| - | The additions consist of: | + | ===== Download ===== |
| - | * Last Glacial Maximum, Mean Annual Temperatures: 1 speleothem record and 2 terrestrial records from Shakun et al. | + | <note tip>\\ [[pmip3:synth:bartlein:download|Click here to access the data]]</note> |
| - | * Mid-Holocene, Mean Annual Temperatures: 3 speleothem records | + | |
| - | * Mid-Holocene, Mean Annual Precipitation: 4 speleothem records | + | |
| - | The organisation of the files are the same as described in section 1 above. | ||
| - | References: | + | ===== Contact ===== |
| - | * **Schmittner, A.**, N. M. Urban, J. D. Shakun, N. M. Mahowald, P. U. Clark, P. J. Bartlein, A. C. Mix, A. Rosell-Melé, 2011. **Climate Sensitivity Estimated from Temperature Reconstructions of the Last Glacial Maximum**. Science, 334, 1385-1388, [[http://www.sciencemag.org/content/334/6061/1385|DOI: 10.1126/science.1203513]] | + | |
| - | * **Shakun, J. D.**, P. U. Clark, F. He, S. A. Marcott, A. C. Mix, Z. Liu, B. Otto-Bliesner, A. Schmittner and E. Bard, 2012. **Global warming preceded by increasing carbon dioxide concentrations during the last deglaciation**, Nature, 484, 49-55, [[http://www.nature.com/nature/journal/v484/n7392/full/nature10915.html|DOI:10.1038/nature10915]] | + | You can get the author(s) contact details on the [[http://link.springer.com/article/10.1007%2Fs00382-010-0904-1|Journal page]] |
| - | * **Harrison, S. P.**, P. J. Bartlein, S. Brewer, I. C. Prentice, M. Boyd, I. Hessler, K. Holmgren, K. Izumi, K. Willis, 2013. **Climate model benchmarking with glacial and mid-Holocene climates**. Climate Dynamics, [[http://link.springer.com/article/10.1007%2Fs00382-013-1922-6|DOI 10.1007/s00382-013-1922-6]] | + | |
| \\ \\ \\ | \\ \\ \\ | ||
pmip3/synth/bartlein/index.1387380895.txt.gz · Last modified: 2013/12/18 15:34 by jypeter
