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epd_surface_samples [2015/06/23 17:22]
127.0.0.1 external edit
epd_surface_samples [2016/06/24 00:45] (current)
bdavis [Introduction]
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 ====== EPD Surface Samples ====== ====== EPD Surface Samples ======
  
-** On this page: Details about pollen surface samples ​and upcoming workshop to establish a new EPD surface sample database ​**+** On this page: An introduction to pollen surface samples **
  
 ____________________________________________________________________________________ ____________________________________________________________________________________
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 ===== Introduction ===== ===== Introduction =====
  
-**The EPD does not currently include ​pollen surface samples**\\ ​+**The EPD now includes modern ​pollen surface samples ​in their own database, the EMPD**\\ 
  
  
-The development of publicly-accessible databases of fossil pollen data in the last 20 years such as the European Pollen Database (EPD) (http://​www.europeanpollendatabase.net/​),​ have provided scientists with an unrivalled source of information to study past changes in terrestrial vegetation, land-cover and climate at large spatial scales over the Quaternary period. Interpreting this fossil pollen record however requires a clear understanding of the relationship between pollen as the proxy, and the environmental parameter (vegetation,​ land-cover, climate) that the pollen proxy represents. Understanding this relationship has largely been achieved through the use of modern pollen surface samples, but unlike fossil pollen data, we do not yet have a public database of modern pollen data in Europe.+The development of publicly-accessible databases of fossil pollen data in the last 20 years such as the European Pollen Database (EPD) (http://​www.europeanpollendatabase.net/​),​ have provided scientists with an unrivalled source of information to study past changes in terrestrial vegetation, land-cover and climate at large spatial scales over the Quaternary period. Interpreting this fossil pollen record however requires a clear understanding of the relationship between pollen as the proxy, and the environmental parameter (vegetation,​ land-cover, climate) that the pollen proxy represents. Understanding this relationship has largely been achieved through the use of modern pollen surface samples.
  
-There is a pressing need from the European scientific community for a standardised,​ fully documented and quality-controlled dataset of modern pollen samples which can be openly accessed, and to which scientists can also contribute and help maintain. ​ +There is a pressing need from the European scientific community for a standardised,​ fully documented and quality-controlled dataset of modern pollen samples which can be openly accessed, and to which scientists can also contribute and help maintain. ​After a major community based effort starting in 2011 we have now established a modern surface sample database within the EPD that contains almost 5000 samples. The European Modern Pollen Database (EMPD) is now available and free to download. ​
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 +
 +The first stage of the database resulted in a publication co-authored by all participants [[http://​arve.unil.ch/​pub/​EMPD/​Davis_et_al_2013.pdf|Davis et al. 2013]]. Please note the additional [[http://​arve.unil.ch/​pub/​EMPD/​Davis_et_al_2013_Erratum.pdf|Erratum]] which provides some important corrections,​ particularly to the official author list. 
 +
 +
 +**We are now attempting a second stage of expansion to further increase the size of the EMPD**\\ ​
 +
 +
 +Following the EPD Open Meeting at CEREGE, France in June 2016, it has been decided to build on the success of the EMPD by initiating a second stage of expansion. We are therefore again encouraging European palynologists to submit their modern surface samples to the database. More details are on the EMPD stage 2 page.
 +____________________________________________________________________________________
 ===== Why are pollen surface samples useful? ===== ===== Why are pollen surface samples useful? =====
  
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 ____________________________________________________________________________________ ____________________________________________________________________________________
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-===== The EPD surface sample database ===== 
- 
-** A workshop in September 2011 will establish a new public surface sample database as part of the EPD  ** 
- 
- 
-Around 2400 samples have already been collected on behalf of the EPD, while a further 4800 have been pledged by European palynologists (although we expect around 1000 of these to be duplicates). ​ 
- 
-{{surface_samples_figure_2.jpg?​600}} 
-*Note: 16. Filipa Naughton is now at LNEG (Portugal) 
- 
-\\ 
-The workshop will need to complete a number of tasks in order to assimilate this data into a single, well-documented and quality controlled database: 
- 
-1) Taxonomy harmonisation. Different pollen analysts often adopt their own taxa naming conventions. All the data entered into the EPD need to be harmonised so as to conform to a standardised taxonomy. 
- 
-2) Georeferencing. UTM and analogue latitude/​longitude co-ordinates need to be converted to decimal latitude/​longitude. All sample co-ordinates will be checked using Google Earth and cross-checked against site altitude using a high resolution Digital Terrain Model. Semi-automatic routines have already been prepared for this task. 
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-3) Core top selection and age-control. Core-top samples from existing fossil pollen records in the EPD will also be included as surface samples. A recent comprehensive review of EPD chronologies will help identify these samples. 
- 
-4) Meta-data compilation. Detailed meta-data needs to be included, in some cases requiring datamining of the literature. This includes type of sample and sampling method (core top, moss polster, soil, tauber-trap,​ single sample, merged samples etc), site details (lake, bog, surface area, surrounding vegetation etc), authorship and publications. 
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-5) Database entry. Data has been provided for the database in different structures and file formats. This needs to be assimilated into standardised tables compatible with existing EPD table formats. 
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-6) General quality control. Further checks need to be undertaken for duplicates, percentage data, samples with low counts, and unusual values. 
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-7) Additional data. It is also intended to provide additional information for each site such as climatic values (used in pollen-climate reconstructions) and standardised land-cover descriptions (used in land-cover reconstructions). These will be generated from existing high-resolution gridded climate (CRU) and land-cover (GLCC) datasets and stored in separate working tables. 
- 
-____________________________________________________________________________________ 
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-===== The EPD needs your help! ===== 
- 
-** We need surface sample data and we need people to help in the compilation process ​ ** 
- 
-The workshop is only one small part of the process. The most important part is the submission of data. If you have surface samples or core-top samples you are willing to share, no matter how big or small, then please send them in. We need the following information with the pollen data: 
- 
-1) Author/​Analyst and contact address & email\\ 
-2) Any references/​publications relating to the samples\\ 
-3) Location (Latitude, Longitude, Altitude)\\ 
-4) Type of sample (eg core top from lake/bog, moss polster, soil sample etc)\\ 
- 
-The following would also be useful: 
- 
-5) Site description (type of site eg lake or bog etc, physical setting eg valley bottom, mountain top etc)\\ 
-6) Size of site (eg hectare of lake or bog)\\ 
-7) Surrounding vegetation\\ 
-8) Collection method (eg trap, corer, assimilation of multiple-samples from area etc)\\ 
- 
-We welcome any data from Europe (including Russia), the Middle East and North Africa, and including marine data. 
- 
-** If at all possible, please download a copy of the metadata file and fill in all relevant fields accordingly. **\\ 
- 
-** Submissions for the first version of the database are now closed. Any data submitted will instead be made available in original form via FTP site until the first official update to the database occurs. ** 
  
  
-===== Contact ===== 
  
-** If you would like to help, or wish to submit data, please contact Basil Davis: basil.davis(at)epfl.ch ​ ** 
  
 ===== References ===== ===== References =====
epd_surface_samples.1435072927.txt.gz · Last modified: 2016/06/23 23:12 (external edit)
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