# Old World Drought Atlas 
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#                World Data Service for Paleoclimatology, Boulder 
#                                  and 
#                     NOAA Paleoclimatology Program 
#             National Centers for Environmental Information (NCEI)
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# 
# NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. 
# If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. 
#
# Online_Resource: https://www.ncdc.noaa.gov/paleo/study/19419 
# Online_Resource: http://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/owda-readme.txt
#
# Original_Source_URL: 
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# Description/Documentation lines begin with #
# Data lines have no #
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# Archive: Climate Reconstructions
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# Parameter_Keywords: Drought, PDSI
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# Contribution_Date
#	Date: 2015-11-06
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# Title
#	Study_Name: Old World Drought Atlas
#--------------------
# Investigators
# 	Investigators: Cook, E.R., et al.
#--------------------
# Description_and_Notes
#	Description: Gridded (0.5x0.5 degree) reconstruction of drought (Palmer Drought Severity Index, PDSI) 
#	for Europe and the Mediterranean region over the past 2,000 years, based on tree-ring data.  
#--------------------
# Publication 
#	Authors: Edward R. Cook, Richard Seager, Yochanan Kushnir, Keith R. Briffa, Ulf Büntgen, David Frank, Paul J. Krusic, Willy Tegel, Gerard van der Schrier, Laia Andreu-Hayles, Mike Baillie, Claudia Baittinger, Niels Bleicher, Niels Bonde, David Brown, Marco Carrer, Richard Cooper, Katarina Čufar, Christoph Dittmar, Jan Esper, Carol Griggs, Björn Gunnarson, Björn Günther, Emilia Gutierrez, Kristof Haneca, Samuli Helama, Franz Herzig, Karl-Uwe Heussner, Jutta Hofmann, Pavel Janda, Raymond Kontic, Nesibe Köse, Tomáš Kyncl, Tom Levanič, Hans Linderholm, Sturt Manning, Thomas M. Melvin, Daniel Miles, Burkhard Neuwirth, Kurt Nicolussi, Paola Nola, Momchil Panayotov, Ionel Popa, Andreas Rothe, Kristina Seftigen, Andrea Seim, Helene Svarva, Miroslav Svoboda, Terje Thun, Mauri Timonen, Ramzi Touchan, Volodymyr Trotsiuk, Valerie Trouet, Felix Walder, Tomasz Ważny, Rob Wilson and Christian Zang
#	Published_Date_or_Year: 2015-11-06
#	Published_Title: Old World megadroughts and pluvials during the Common Era 
#	Journal_Name: Science Advances
#	Volume: 1
#	Edition: e1500561
#	Issue: 10
#	Pages: 
#	Report_Number: 
#	DOI: 10.1126/sciadv.1500561 
#	Online_Resource: http://advances.sciencemag.org/content/1/10/e1500561.abstract
#	Full_Citation: 
#	Abstract: Climate model projections suggest widespread drying in the Mediterranean Basin and wetting in Fennoscandia in the coming decades largely as a consequence of greenhouse gas forcing of climate. To place these and other "Old World" climate projections into historical perspective based on more complete estimates of natural hydroclimatic variability, we have developed the "Old World Drought Atlas" (OWDA), a set of year-to-year maps of tree-ring reconstructed summer wetness and dryness over Europe and the Mediterranean Basin during the Common Era. The OWDA matches historical accounts of severe drought and wetness with a spatial completeness not previously available. In addition, megadroughts reconstructed over north-central Europe in the 11th and mid-15th centuries reinforce other evidence from North America and Asia that droughts were more severe, extensive, and prolonged over Northern Hemisphere land areas before the 20th century, with an inadequate understanding of their causes. The OWDA provides new data to determine the causes of Old World drought and wetness and attribute past climate variability to forced and/or internal variability.
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# Funding_Agency 
#	Funding_Agency_Name: US National Oceanic and Atmospheric Administration
#	Grant: CCDD NA10OAR4310123
#------------------
# Funding_Agency 
#	Funding_Agency_Name: US National Science Foundation
#	Grant: 0075956, ESH0317288, 0758486, 1103314 
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# Site_Information 
#	Site_Name: Europe-Mediterranean
#	Location: Europe
#	Country:  
#	Northernmost_Latitude: 70.75
#	Southernmost_Latitude: 27.25
#	Easternmost_Longitude: 44.75
#	Westernmost_Longitude: -11.75
#	Elevation: m  
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# Data_Collection   
#	Collection_Name: OWDA
#	Earliest_Year:  0
#	Most_Recent_Year: 2012
#	Time_Unit:  AD
#	Core_Length: m
#	Notes: 
#------------------
# Chronology_Information
#	Chronology: 
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# Variables 
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# Data variables follow are preceded by "##" in columns one and two.
# Data line variables format:  Variables list, one per line, shortname-tab-longname-tab-longname components (9 components: what, material, error, units, seasonality, archive, detail, method, C or N for Character or Numeric data) 
#
## age_AD	age, , , year AD, , , , ,N
## pdsi	Palmer Drought Severity Index, , , , , Climate Reconstructions, , tree-ring reconstruction,N 
#
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# Data:
# Data lines follow (have no #)

Data is available in netCDF format at: 
http://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/owda.nc 
ZIP file of annual PDSI maps in .JPG format is located at: 
http://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/owda-maps.zip 
ZIP file containing QuickTime .mov animation of the PDSI maps is located at: 
http://www1.ncdc.noaa.gov/pub/data/paleo/treering/reconstructions/europe/owda-animation.zip