LTER network Toolik Field Station MBLhome page

Sun and Moon

Toolik Weather Graphs

Arctic LTER Weather Stations

Toolik Webcam

Animated Gif of yesterday's Webcam

Arctic LTER Inhouse login

  • 1983-2012_Kuparuk_Chl - Sestonic and epilithic chlorophyll for the Kuparuk River during the summers of 1983 - 2012. Water was filtered for sestonic chlorophyll and rocks from designated locations on the Kuparuk River were scrubbed for epilithic chlorophyll approximately three times each summer. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Both sestonic and epilithic chlorophyll a were analyzed for the Kuparuk from 1983 to current.

  • 1983-2012_Kuparuk_NO3 - Samples from designated stations from the Kuparuk River were collected during each summer from 1983 to 2012. In general, three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Water samples have been analyzed for nitrate since 1983.

  • 1983-2012_Kuparuk_SRP - Samples from designated stations from the Kuparuk River were collected during each summer from 1983 to 2012. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August. Soluble reactive phosphorus samples were analyzed since 1983.

  • 1984-2012_Kuparuk_NH4 - Samples from designated stations from the Kuparuk River were collected during each summer from 1984 to 2012. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August. Water samples were analyzed for ammonium since 1984.

  • 1989-2012_Kuparuk_Cations - Samples were collected and analyzed for the cations potassium, sodium, calcium, and magnesium. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Cation samples were analyzed for the following summers on the Kuparuk River: 1989, 1990, 1993, 1994, 2000, 2011 & 2012.

  • 1989-2012_OksrukuyikNO3 - Samples from designated stations from the Oksrukuyik were collected during each summer from 1989 to current time. Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. Samples were analyzed for Nitrate since 1989 on the Oksrukuyik Creek.

  • 1989-2012_Oksrukuyik_NH4 - Ammonium Samples were collected and analyzed from designated stations from the Oksrukuyik were collected during each summer from 1989 to current time. Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery.

  • 1989-2012_Oksrukuyik_SRP - Samples from designated stations from the Oksrukuyik were collected during each summer from 1989 to current time. Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. Soluble reactive phosphorus samples were analyzed since 1989.

  • 1990-2012_Kuparak_Anions - Water samples analyzed for sulfate and chloride anions. Samples from designated stations from the Kuparuk River were collected during each summer from 1990 to current time however anaysis was only conducted for years 1990-1994, 2000 and 2007 to 2012. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August at two sampling locations.

  • 1990-2012_Oksrukuyik_Anions - Samples from designated stations from the Oksrukuyik were collected during some summers from 1990 to current time. Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. Anions were analyzed on the Oksrukuyik Creek since 1990. Data is available for the following years: 1990-1994 and 2007 to present (2012).

  • 1990-2012_Oksrukuyik_Cations - Samples from designated stations from the Oksrukuyik were collected during some summers from 1989 to current time (1990, 1993, 1994, 2011 & 2012). Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery.

  • 1990-2012_Oksrukuyik_Chl - Sestonic and epilithic chlorophyll a for the Oksrukuyik Creek during the summers of 1990 - current. Water was filtered for sestonic chlorophyll and rocks from designated locations on the Oksrukuyik Creek were scrubbed for epilithic algae approximately three times during summer, once in each June, July, and August. Phosphorus, in the form of phosphoric acid, and nitrogen, in the form of ammonium sulfate were added to the river 1991-1996 to raise SRP by 0.32 uM and N by 7.1 uM, respectively. Sampling stations were in the fertilized reach 1990-1996, in a recovery reach 1997-1999 and in the reference reach of the stream all years. Chlorophyll a was analyzed for the Oksrukuyik Creek since 1990.

  • 1991-2012_Kuparuk_BenthicParticulates - Benthic samples were analyzed for particulate carbon, nitrogen, and phosphorus since 1991. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August. Note that no data is available for 1993.

  • 1992-2012_Kuparuk_Alkalinity - Water samples from designated stations in the Kuparuk River (near Toolik Field Station, Alaska) were collected and analyzed for alkalinity in the following years: 1992-1994, 1996-2004, 2009 and 2011-2012. Phosphorus addition has occurred in the Kuparuk River since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August at two sampling locations.

  • 1992-2012_Oskrukuyik_Alkalinity - Samples for alkalinity anaysis were collected from designated stations in the Oksrukuyik were collected during select summers from 1992 to current time. These summers are 1992, 1994, 2011 and 2012. Phosphorus addition has occurred in the Oskrukuyik from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. Alkalinity was analyzed in the Oksrukuyik Creek in 1992, 1994, and 2011 to present.

  • 1993-2012_Kuparuk_Moss - This file contains the consolidated data for percent cover of dominant bryophytes and other easilty idenfiable macro-algae in the experimental reaches of the Kuparuk River beginning in 1993 and updated annually. In some years percent cover was recorded more than one time per seaon. In all years percent cover was recorded in riffle habitats and in some (early) years percent cover was recorded for pool habitats. Moss point transects have been done on the Kuparuk since 1993.

  • 1994-2012_Kuparuk_DOC - Samples from designated stations from the Kuparuk River were collected during each summer from 1994 to current time. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Many years only have reference reach data and no data is available for summer of 2000.

  • 1994-2012_Kuparuk_SestonicParticulates - Samples from designated stations on the Kuparuk River were collected between 1994 and present to be analyzed for sestonic particulate carbon, nitrogen, and phosphorus. Phosphorus addition has occurred on the Kuparuk River since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August. Sestonic particulate data is available for the following years: 1994 to 1999, 2003 to 2005 and 2008 to 2012.

  • 1994-2012_Kuparuk_TDN - Samples from designated stations from the Kuparuk River were collected during each summer from 1994 to current time. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Samples have been analyzed for total dissolved nitrogen on the Kuparuk since 1994.

  • 1994-2012_Kuparuk_TDP - Samples from designated stations from the Kuparuk River were collected during each summer from 1983 to current time. Total Dissolved Phosphorous (TDP) analysis began in 1994. Phosphorus addition has occurred since 1983; station sites are relative distance from the original 1983 phosphorus dripper. Stations include sites in a reference, recovery, and fertilized reach. Reaches were defined based on the location of phosphorous addition (see methods). Phosphoric acid is added to the stream to increase the soluble reactive phosphorus by 0.32 uM. Three sampling dates occurred each summer; once in June prior to the start of fertilization and once each in July and August. No data is available for the year 2000.

  • 1994-2012_Oksrukuyik_BenthicParticulates - Benthic samples were analyzed for particulate carbon, nitrogen, and phosphorus. Samples from designated stations from the Oksrukuyik Creek were collected during each summer from 1994 to current time.

  • 1994-2012_Oksrukuyik_SestonicParticulates - Samples from designated stations from the Oksrukuyik Creek were collected during each summer from 1994 to current time. Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. Samples were collected to be analyzed for sestonic particulate carbon, nitrogen, and phosphorus. Note that no data is available for the following years: 2002, 2004, 2006, 2007.

  • 1995-2012_Oksrukuyik_TDN - Samples were collected for Total Dissolved Nitrogen (TDN) from 1995 to present at designated stations on the Oksrukuyik River on the North Slope of Alaska. Phosphorus addition occurred on the Oksrukuyik River from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, ammonium sulfate was added along with the phosphoric acid. This addition of ammonium sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. Samples have been analyzed for total dissolved nitrogen on the Oksrukuyik Creek since 1995 and this file includes data from 1995-1997, 2000, 2003-2005 and 2007-present. Data is not available for other years.

  • 1996-2012_Oksrukuyik_TDP - Samples from designated stations from the Oksrukuyik were collected during each summer from 1996 to current time and analysed for total disolved phosphorous (TDP). Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. TDP was analyzed for the following years: 1996 to 1999, 2002 to 2005 and 2007 to 2012.

  • 2007-2012_Oksrukuyik_DOC - Samples from designated stations from the Oksrukuyik were collected during each summer from 1989 to current time. Phosphorus addition has occurred from 1991 to 1996; station sites are relative distance from the original 1991 dripper. Phosphoric acid was added to the stream to increase soluble reactive phosphorus by 0.32 uM. From 1993 to 1996, Ammonium Sulfate was added along with the Phosphoric Acid. This addition of Ammonium Sulfate was added to the stream to increase N by 7.1 uM. From 1997 to present, the historic fertilized reach has been in recovery. Dissolved Organic Carbon has been analyzed on the Oksrukuyik Creek since 2007.

  • 2011-2012KupChamberDO - Dissolved oxygen was measured in sealed chambers on representative river rocks periodically throughout the 2011 and 2012 open water season in the Kuparuk River. These data provide information on gross primary production and respiration from representative river rocks taken from 3 experimental reaches in the Kuparuk.

Please contact arc_im@mbl.edu with questions, comments, or for technical assistance regarding this web site.