ISUS V3 Nitrate Sensor


ISUS V3 nitrate sensor is a real time, chemical free sensor designed to overcome the traditional challenges associated with reagent-based nitrate analysis in aquatic environments.
  • Kenneth S. Johnson, Luke J. Coletti, Hans W. Jannasch, Carole M. Sakamoto, Dana D. Swift, and Stephen C. Riser (2013) Long-term nitrate measurements in the ocean using the In Situ Ultraviolet Spectrophotometer: sensor integration into the Apex profiling float Journal of Atmospheric and Oceanic Technology doi:10.1175/JTECH-D-12-00221.1 Read Now
  • Lucas, A.J., Dupont, C.L., Tai, V, Largier, J.L., Palenik, B, Franks, J.S. (2011) The green ribbon: Multiscale physical control of phytoplankton productivity and community structure over a narrow continental shelf. American Society of Limnology and Oceanography, Inc. 56 (2), 611-626 doi:10.4319/lo.2011.56.2.0611
  • Lucas, A.J, Franks, P.J.S., Dupont, C.L. (2011) Horizontal internal-tide fluxes support elevated phytoplankton productivity over the inner continental shelf. Limnology and Oceanography: Fluids and Environments. 1 56-74
  • Pellerin, B.A, Saraceno, J, Shanley, J.B., Sebestyen, S.D., Aiken, G.R., Wollheim, W.M., Bergamaschi, B.A. (2011) Taking the pulse of snowmelt: in situ sensors reveal seasonal, event and diurnal patterns of nitrate and dissolved organic matter variability in an upland forest stream. Biogeochemistry doi:10.1007/s10533-011-9589-8 Read Now
  • Riser, S.C., Johnson, K.,Lewis, M.R., Altshuler, T. (2011) Autonomous Measurements of Oceanic Dissolved Nitrate from Commercially Available Profiling Floats Equipped with ISUS APPROVED FOR PUBLIC RELEASE doi:ADA555146
  • Ryan, J, Greenfield, D, Marin III, R, Preston, C, Roman, B, Jenson, S, Pargett, D, Birch, J, Mikulski, C, Goucette, G, Scholin, C. (2011) Harmful phytoplankton ecology studies using an autonomous molecular analytical and ocean observing network. American Society of LImnology and Oceanography, Inc 56(4), 1255-1272 doi:10.4319/lo.2011.56.4.1255
  • Alkire, M.B., Kelly, K.F., Morison, J, Collier, R.W., Guay, C.K., Desiderio, R.A., Rigor, I.G., McPhee, M. (2010) Sensor-basaed profiles of the NO parameter in the central Arctic and southern Canada basin: New insights regarding the cold halocline. Deep-Sea Research 57 1432-1443 doi:10.1016/j.dsr.2010.07.011
  • Heffernan, J.B., Cohen, M.J. (2010) Direct and indirect coupling of primary production and diel nitrate dynamics in a subtropical spring-fed river. Limnol. Oceanogr., 55(2), 677 - 688.
  • Johnson K. (2010) Simultaneous measurements of nitrate, oxygen, and carbon dioxide on oceanographic moorings: Observing the Redfield ratio in real time. Limnol. Oceanogr., 55(2), 615-627.
  • Johnson, K. (2010) Nitrate supply from deep to near-surface waters of the North Pacific subtropical gyre nature 465 1062-1065
  • Plant, J., Johnson, K.S., Fitzwater, S.E., Sakamoto, C.M., Coletti, L.J., Jannasch, H.W. (2010) Tidally oscillating bisulfide fluxes and fluid flow rates observed with in situ chemical sensors at a warm spring in Monterey Bay, California Deep Sea Research 57(12) 1585-1595 doi:10.1016/j.dsr.2010.10.001
  • Ryan, J.P., McManus, M.A., Sullivan, J.M. (2010) Interacting physical, chemical and biological forcing of phytoplankton thin-layer variability in Monterey Bay, California. Continental Shelf Research 30(1) 7-16 doi:10.1016/j.csr.2009.10.017
  • Stabeno, P., Napp, J, Mordy, C, Whitledge, T. (2010) Factors influencing physical structure and lower trophic levels of the eastern Bering Sea shelf in 2005: Sea ice, tides and winds. Progress in Oceanography 85 180-196 Read Now
  • MacIntyre, G., Plache. B, M.R. Lewis., Andrea, J, Feener, S, McLean, S.D. (2009) ISUS/SUNA Nitrate Measurements in Networked Ocean Observing Systems. White Paper Read Now
  • Prestigiacomo, A.R. (2009) Nitrate and Bisulfide: Monitoring and Patterns in Onondaga Lake, New York, Following Implementation of Nitrification Treatment, Prestigiacom, A.R, Effler, S.W., Matthew, D.A., Coletti, L.J., Water Environment Research, 81(5)
  • Ryan, J.P., Fischer, A.M., Kudela, R.M., Gower, J.F.R., King, S.A., Marin III, R, Chavez, F.P. (2009) Influences of upwelling and downwelling winds on red tide bloom dynamics in Monterey Bay, California. Continental Shelf Research 29 785 - 795 Read Now
  • Jannasch, H.W., Coletti, L.J., Kenneth, S.J., Fitzwater, S.E., Needoba, J.A., Plant, J.N. (2008) The Land/Ocean Biogeochemical Observatory: A robust networked mooring system for continuously monitoring complex biogeochemical cycles in estuaries Limnol. Oceanogr. Methods 6 263-276 Read Now
  • Johnson, K.S., Needoba, J.A. (2008) Mapping the spatial variability of plankton metabolism using nitrate and oxygen sensors on an autonomous underwater vehicle Limnol. Oceanogr., 53(5, part 2), 2237–2250 Read Now
  • Schaeffer, B.A., Morrison, J.M., Kamykowski, D, Feldman, G.C., Xie, L, Liu, Y, Sweet, W, McCulloch, A, Banks. (2008) Phytoplankton biomass distribution and identification of productive habitats within the Galapagos Marine Reserve by MODIS, a surface acquisition system, and in-situ measurements. Remote Sensing of Environment 112 3044-3054 doi:10.1016/j.rse.2008.03.005
  • Johnson, K.S., Needoba, J.A., Riser, S.C., Showers, W.J. (2007) Chemical sensor networks for the aquatic environment. Chemical Reviews in press.
  • Johnson, K.S., Coletti, L.J., Chavez, F.P. (2006) Diel nitrate cycles observed with in situ sensors predict monthly and annual new production. Deep Sea Research 53: 561-73.
  • Chase, Z., Johnson, K.S., Elrod, V.A.,Plant, J.N., Fitzwater, S.E., Pickell, L, Sakamoto, C.M. (2005) Manganese and iron distributions off central California influenced by upwelling and shelf width. Marine Chemistry 95 235-54
  • Fitzwater, S.E., Johnson, K.S, Elrod, V.A., Ryan, J.P, Coletti, L.J., Tanner, S.J., Gordon, R.M., Chavez, F.P. (2003) Iron, nutrient and phytoplankton biomass relationships in upwelled waters of the California coastal system. Continental Shelf Research 23: 1523-44
  • Johnson, K.S., Coletti. L.J. (2002) In situ ultraviolet spectrophotometry for high resolution and long-term monitoring of nitrate, bromide and bisulfide in the ocean. Deep Sea Research 49 1291-1305