North Pole Environmental Observatory 2014 Aerial CTD Survey NSF Grants OPP-9910305, OPP-0634122, OPP-0352754, and ARC-0856330 CTD Station Position Latitude _ Longitude Cast Date / Time = SBE-19plus s/n 5076 = Cast 1 Barneo1 (89_13E) 88deg 58.87min North 013deg 39.91min East 2014-4-12/1134 UTC Cast 2 87_180 86deg 59.88min North 179deg 38.75min East 2014-4-15/1217 UTC Cast 3 87_90E 87deg 01.00min North 090deg 35.00min East 2014-4-16/1004 UTC Cast 4 Barneo2 (89_16E) 88deg 37.24min North 016deg 10.62min East 2014-4-16/1423 UTC Cast 5 85_90 85deg 00.28min North 090deg 11.37min East 2014-4-17/1038 UTC Cast 6 86_90 85deg 56.59min North 089deg 53.86min East 2014-4-17/1343 UTC Cast 7 90N 89deg 59.19min North 001deg 29.50min West 2014-4-18/1324 UTC = SBE-19plus s/n 4000 = Cast 8 Barneo3 (88_14E) 88deg 08.60min North 014deg 18.88min East 2014-4-20/1227 UTC Cast 9 L6 (86_75W) 85deg 51.70min North 072deg 55.25min West 2014-4-21/1328 UTC Cast 10 L7 (87_80W) 86deg 58.73min North 080deg 13.14min West 2014-4-23/1443 UTC Cast 11 L5 (85_68W) 85deg 02.02min North 067deg 36.81min West 2014-4-23/1711 UTC Cast 12 L4 (84_68W) 84deg 32.09min North 065deg 33.13min West 2014-4-23/1905 UTC Cast 13 L3-L2 83deg 52.43min North 064deg 53.94min West 2014-4-24/1320 UTC Cast 14 L1 (83N_65W) 83deg 08.20min North 065deg 17.47min West 2014-4-24/1438 UTC Each cast is an ASCII file of twelve numerical columns- (1) = Scan (2) = Pressure, Strain Gauge [db] (3) = Temperature [ITS-90, deg C] (4) = Depth [salt water, m], lat = 87 (5) = Potential Temperature [ITS-90, deg C] (6) = Salinity [PSU] (7) = Potential Density [sigma-theta, kg m-3] (8) = Oxygen [mL L-1] (9) = Oxygen [mmol m-3] (10) = Oxygen [mmol kg-1] (11) = oxsat [mL L-1], calculation method: garcia-gordon Part of the observational program of the North Pole Environmental Observatory, these CTD-chemistry stations were obtained using a Twin Otter skiplane operating out of the Russian Ice Station Barneo and Canadian Forces Station Alert to record ocean sections from the North Pole along 90 degrees East and 180 degrees and 90 degrees longitudes, plus between Alert and the Pole. The measurements were made with a Seabird SBE-19plus Seacat following a landing at these positions on the Arctic sea ice. Mounted on and plumbed together with the CTD was SBE-43 Dissolved Oxygen Sensor. Suspended on the line above the CTD and plumbed to its pump outflow was an ISUS V2 Nitrate Sensor. Using a winch installed in the aft door of the airplane also allowed Niskin Bottles to be mounted and tripped at chosen depths on the line, and water samples from these were drawn inside the heated fuselage. Concentrations of various chemical tracers were obtained, and these and the Nitrate data are archived in a different submission. This archive is a product of the ocean chemistry data processing motivated to optimize the quality of the oxygen profiles, as described in the accompanying Word document. Further work is likely to tweak the processing algorithm with variants in the T-C alignment and Thermal Lag correction to possibly improve resolution of physical features like steps, in which case an updated archive may be offered. Deployment history, profile plots and other analysis using these data may be viewed at the NPEO website (http://psc.apl.washington.edu/northpole). For further information, please contact Dr. James Morison morison@apl.washington.edu (206) 543-1394 Dr. Matt Alkire malkire@apl.washington.edu (206) 897-1623 Dr. Michael Steele mas@apl.washington.edu (206) 543-6586 Roger Andersen roger@apl.washington.edu (206) 543-1258 at Polar Science Center, Applied Physics Lab, University of Washington 1013 NE 40th, Seattle, WA 98105-6698 USA FAX (206) 616-3142