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Data Discovery and Access to The International Surface Pressure Databank (ISPD) 1 Thomas Cram Gilbert P. Compo* Doug Schuster Chesley McColl* Steven Worley National Center for Atmospheric Research, Boulder, CO *NOAA/CIRES, Boulder, CO AGU 2012 Fall Meeting: IN44A-05
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2 Research Data Archive (RDA) at NCAR rda.ucar.edu 1.600+ distinct datasets for climate and weather research 2.Collections: ocean & atmosphere observations, analyses, reanalyses, operational NWP outputs 3.Free and open access http://rda.ucar.edu AGU 2012 Fall Meeting: IN44A-05
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ISPD Overview 3 World’s largest collection of surface & sea level pressure observations Land station Marine observations Tropical cyclone best track Period (version 2): 1768 – 2010 Volume: 465 Gbyte Available since Aug 2010 AGU 2012 Fall Meeting: IN44A-05
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ISPD Overview 4 60+ Contributors o Atmospheric Circulation Reconstructions over the Earth (ACRE) o Australian Bureau of Meteorology o British Antarctic Survey o Cook Islands Meteorological Service o Danish Meteorological Institute o Deutscher Wetterdienst (DWD; German Weather Service) o European and North Atlantic Daily to Multidecadal Climate Variability (EMULATE) o ETH Zurich, Switzerland o GCOS/WCRP Working Group on Observational Data Sets for Reanalysis o MANY MANY MORE…. Assembled by NOAA/ESRL, CIRES (Univ. of Colorado), & NOAA/NCDC AGU 2012 Fall Meeting: IN44A-05
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20 th Century Reanalysis 5 Global reanalysis of atmospheric circulation Period: 1869 – 2010 Assimilates ISPDv2 as input Compo et al. (2011) QJRMS AGU 2012 Fall Meeting: IN44A-05
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20 th Century Reanalysis: Oct 1950 mean 1000 hPa temperature 6 ISPD stations ISPD marine obs AGU 2012 Fall Meeting: IN44A-05
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7 ISPD stations ISPD marine obs AGU 2012 Fall Meeting: IN44A-05 20 th Century Reanalysis: Nov 1960 mean 1000 hPa temperature
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8 ISPD obs assimilated into 20CR 20CR data quality control feedback contained in ISPD Provides estimated uncertainty in obs Helps improve underlying observational database AGU 2012 Fall Meeting: IN44A-05 ISPD & the 20 th Century Reanalysis
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9 ISPD Sample Annual Station Distribution 1850 * Land stations only * No marine stations AGU 2012 Fall Meeting: IN44A-05
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1850 10 1900 * Land stations only * No marine stations AGU 2012 Fall Meeting: IN44A-05 ISPD Sample Annual Station Distribution
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1850 11 1900 1950 * Land stations only * No marine stations AGU 2012 Fall Meeting: IN44A-05 ISPD Sample Annual Station Distribution
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1850 12 1900 1950 2000 * Land stations only * No marine stations AGU 2012 Fall Meeting: IN44A-05 ISPD Sample Annual Station Distribution
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13 ISPD Observations/Year Figure courtesy Chesley McColl, NOAA/ESRL 2010: 53 Million ~ 1.5 Billion total observations AGU 2012 Fall Meeting: IN44A-05
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Data Access: Problem Background Large computational/storage resources needed –Store data –Extract desired data from large grids/files –Convert data to desirable format(s) 14 Scientific data centers have these resources Individual researchers generally don’t AGU 2012 Fall Meeting: IN44A-05
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Goals –Make data more accessible and easier to use for individual researchers Reasonable access volumes Desired data formats User defined parameters/grids 15 Researchers stay focused on research AGU 2012 Fall Meeting: IN44A-05 Data Access: Problem Background
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ISPD Data Access Services 16 Powerful computing resources @ NCAR Large disk storage (~ 0.5 PB) Rich and detailed metadata Direct file download via web Customized data sub-setting HDF-5 to ASCII software tools AGU 2012 Fall Meeting: IN44A-05
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17 ISPD Metadata Features Both group- and file-level metadata Drive interfaces for file grouping and sub- setting tools Support efficient back-end processing Improve scalability Provide “quick look” at data samples AGU 2012 Fall Meeting: IN44A-05
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ISPD Metadata Interface Example 18 AGU 2012 Fall Meeting: IN44A-05
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19 AGU 2012 Fall Meeting: IN44A-05
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20 AGU 2012 Fall Meeting: IN44A-05
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Data Access: ISPD Subset Interface 22 AGU 2012 Fall Meeting: IN44A-05
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ISPD Data Access Services 23 Temporal range sub- setting (daily) Spatial sub-setting Lat/Lon region Individual station ID
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ISPD Data Access Services 24 Data sub-setting options (cont.) Observation type Land station Marine obs Radiosonde Dropsonde TC best track
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ISPD Data Access Services 25 Subsetting processed in delayed mode E-mail notification Download via server-provided scripts (wget)
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26 ISPD 2012 Subset metrics Data accessed: ~ 6.5 TB Data served: ~ 46 GB
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Summary & Future Directions 27 RDA – Supply “User Friendly” Data Parameter & spatial sub-setting Metadata discovery Format conversion Improved and additional services NWSC-Cheyenne opening – more computing power AGU 2012 Fall Meeting: IN44A-05
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28 DOI assignment Geoscience Data Journal article ISPD v3 (1755-2010) Spring 2013 AGU 2012 Fall Meeting: IN44A-05 ISPD Forthcoming
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29 rda.ucar.edu/ds132.0 tcram@ucar.edu AGU 2012 Fall Meeting: IN44A-05
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