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pmip3:synth:bartlein:index [2013/12/18 08:16]
jypeter Page moved from pmip3:synth:bartlein to pmip3:synth:bartlein:index
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>​
 +
 +
 +===== 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:​qrec_06ka.pdf|{{:​pmip3:​synth:​qrec_6ka_xsmall.jpg?​nolink}}]] ​ |  [[https://​wiki.lsce.ipsl.fr/​pmip3/​lib/​exe/​fetch.php/​pmip3:​synth:​qrec_21ka.pdf|{{:​pmip3:​synth:​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: 
-  * netCDF ​binary 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''​ 
-  * text (.csvfiles: ''​**variable**_delta_**period**_ALL_grid_2x2.csv''​+    * Note: in the NetCDF files, the grid cells where there are no data sites are masked 
 +  * //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
  
 Where the **variable**s are... Where the **variable**s are...
  
-  * **mat**: Mean Annual Temperature +  * **mat**: Mean Annual Temperature ​(°C) 
-  * **map**: Mean Annual Precipitation +  * **map**: Mean Annual Precipitation ​(mm) 
-  * **mtco**: Mean Temperature of the Coldest Month +  * **mtco**: Mean Temperature of the Coldest Month (°C) 
-  * **mtwa**: Mean Temperature of the Warmest Month +  * **mtwa**: Mean Temperature of the Warmest Month (°C) 
-  * **gdd5**: Growing Degree Days above 5°C +  * **gdd5**: Growing Degree Days above 5°C (°C days) 
-  * **alpha**: moisture index, defined as Mean Annual Actual Evaporation/​Mean Annual Potential Evaporation+  * **alpha**: moisture index, defined as Mean Annual Actual Evaporation/​Mean Annual Potential Evaporation ​(no units)
  
 ... 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 latitudes and longitudes of the grid, along with 7 variables:+Each ''​**variable**_delta_period_ALL_grid_2x2''​ data file contains the following ​variables:
  
-  ​variable_anm_mean: ​grid-cell mean of reconstructed anomalies +^  Variable ​ ^  Column\\ (.csv file)  ^  Detail ​ ^ 
-  variable_se_mean:​ grid-cell mean of standard errors of estimates +**lat** |  1  | \\ Latitude of grid-cell center (degrees North)\\ \\ | 
-  variable_tstat: ​mean anomaly / mean standard error of estimate ​(anm_mean/se_mean +| **lon** |  2  | \\ Longitude of grid-cell center (degrees East)\\ \\ | 
-  variable_sig: = sign(t) if abs(t) > 2 (same for all variables?+| **variable**_anm_mean |  3  | \\ Grid-cell mean of reconstructed anomalies\\ \\ | 
-  * variable_sig_val: ​=anm_mean ​if sig.ne.+**variable**_se_mean |  4  | \\ Grid-cell mean of standard errors of estimates\\ \\ | 
-  variable_npts:​ number ​of sites in grid box+**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_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\\ \\ |
  
-< Jean-Yves, là, il faut mettre les derniers fichiers de Bart, et mettre à jour la paragraphe ci-dessus pour les formats disponibles > 
  
-<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 alappendix ​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, NM. 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, SP.**, 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.1387354592.txt.gz · Last modified: 2013/12/18 08:16 by jypeter