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epd_surface_samples [2011/07/01 18:10]
bdavis
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. 
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 +**We are now attempting a second stage of expansion to further increase the size of the EMPD**\\ ​
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 +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.
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 ===== Why are pollen surface samples useful? ===== ===== Why are pollen surface samples useful? =====
  
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-===== The EPD surface sample database ===== 
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-** A workshop in September 2011 will establish a new public surface sample database as part of the EPD  ** 
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-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). ​ 
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-{{surface_samples_figure_2.jpg?​600}} 
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-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: 
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-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. 
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-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. 
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-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! ===== 
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-** We need surface sample data and we need people to help in the compilation process ​ ** 
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-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: 
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-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)\\ 
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-The following would also be useful: 
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-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)\\ 
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-We welcome any data from Europe (including Russia), the Middle East and North Africa, and including marine data. 
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-** Anyone submitting data will also get their name on a paper that will be submitted to the journal Grana in September 2011 ** 
  
  
-===== 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.1309536617.txt.gz · Last modified: 2015/06/25 16:07 (external edit)
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