arctic discharge observations the arctic rims and the r-arctic net datasets Åsa rennermalm...
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Arctic Discharge ObservationsArctic Discharge ObservationsThe Arctic RIMS and the R-Arctic Net datasets
Åsa RennermalmPrinceton University
Arctic Discharge ObservationsArctic Discharge Observations
• Arctic-RIMS : Arctic – Regional, Integrated Hydrological Monitoring System
• R-Arctic Net : Regional, Hydrometeorological Data Network for the pan-Arctic Region
• Made available by the Water Systems Analysis Group at University of New Hampshire
Arctic Discharge ObservationsArctic Discharge Observations
• What characterize the discharge data provided by Arctic-RIMS and R-Arctic Net?– Spatial distribution of runoff
measuring stations– Temporal distribution of runoff
measuring stations
Arctic Discharge ObservationsArctic Discharge Observations
• What are the differences between Arctic-RIMS and R-Arctic Net?
5091 runoff measuring stations
Historical dataset? (1871-2001)
URL: www.r-arcticnet.sr.unh.edu
57 runoff measuring stations
Runoff data continuously updated?
More data variables than just runoff
Data exploration tool
URL: rims.unh.edu
Arctic Discharge ObservationsArctic Discharge Observations
• Arctic RIMS data exploration toolData types:Permafrost, Precipitation, Temperature, Runoff (modeled and measured)and more..
Visualization:Gridded dataTime series of point dataAnimations of gridded data over time
Temporal resolution:Daily, monthly, annual, climatology
Spatial coverage:Pan ArcticMajor basinsWatersheds
URL: rims.unh.edu
Arctic Discharge ObservationsArctic Discharge Observations
• Data set characteristics– Spatial distribution (all geo-referenced
stations)
Arctic Discharge ObservationsArctic Discharge Observations
• Data set characteristics– Time series length
Arctic Discharge ObservationsArctic Discharge Observations
• Long time series - important for studying change
Long runoff time series
• Longer than 24 years
• No more than 25% missing data in any season
• Last measurement between 1985-2001
Arctic Discharge ObservationsArctic Discharge Observations
• Long time series - temporal distribution
Arctic Discharge ObservationsArctic Discharge Observations
• Long time series – 1960-1985
1198 stations
1960 1980 2000
Time period:
Arctic Discharge ObservationsArctic Discharge Observations
• Long time series – 1965-1990
902 stations
1960 1980 2000
Time period:
Arctic Discharge ObservationsArctic Discharge Observations
• Long time series – 1970-1995
610 stations
1960 1980 2000
Time period:
Arctic Discharge ObservationsArctic Discharge Observations
• Long time series – 1975-2000
280 stations
1960 1980 2000
Time period:
Arctic Discharge ObservationsArctic Discharge Observations
Conclusions• Arctic RIMS extends until present day• R-Arctic Net greater spatial and temporal
distribution
Questions• Are there more recent data from the R-Arctic
Net stations?• What is the cause of the late 20th century drop
in number of stations?– Station closure?– Unreported data?
Arctic Discharge ObservationsArctic Discharge Observations
• Geo-referencing and calculation of unit discharge require information about:– Latitude– Longitude– Discharge area
• 802 of the 5091 R-Arctic Net stations has no information about either latitude, longitude or discharge area
• How valuable are these stations?• What characterize them?
Arctic Discharge ObservationsArctic Discharge Observations
• Data set characteristics
Stations with no information about latitude, longitude or discharge area
Arctic Discharge ObservationsArctic Discharge Observations
• Data set characteristics
Stations with no information about latitude, longitude or discharge area
Arctic Discharge ObservationsArctic Discharge Observations
• Data set characteristics
Stations with no information about latitude, longitude or discharge area
Arctic Discharge ObservationsArctic Discharge Observations
Summary• The stations with no information
about latitude, longitude or discharge area have runoff time series characterized by being short.
• About 50 of the stations with long time series have less than 25% missing data.
Arctic Discharge ObservationsArctic Discharge Observations
• Drainage area size