Air, Ice and Biogeochemical Data from SHEBA IOEB As part of the Surface Heat Budget of the Arctic Ocean (SHEBA) buoy array, a Japan Marine Science and Technology Center (JAMSTEC) Ice-Ocean Environmental Buoy (IOEB) was deployed on September 30, 1997 from the Des Groseilliers at 75— 5.4' N, 140— 54.7' W enroute to installation of the ice camp. Initially located about 50 km from the array, the buoy drifted in the same general manner as the main camp, and was recovered the following year from the Louis St. Laurent on October 1, 1998 during breakout of the SHEBA camp. In 365 days, the system drifted a total of 2000 km from the Canada Basin, over the Northwest Ridge and Chukchi Plateau, to the slope of the Makarov Basin. Complete year-long timeseries of buoy drift, air temperature, barometer, and compass heading, were telemetered via Argos during the drift. Partial-year records of wind (< 1/2 year) and ice thermistor profiles (~ 3/4 year) were also acquired. Upon recovery of the buoy, biogeochemical samples from a sediment trap, and upper ocean temperature and salinity data at 65, 105, and 165 m were retrieved along with current profiles from an ADCP. This dataset comprises only the meteorological, ice, and biogeochemical data. Data from the ADCP and CTDs are archived in "Current Data from ADCP on SHEBA IOEB" (Plueddemann, Takizawa, and Krishfield). The raw Argos buoy positions are de-spiked, linearly interpolated at a 1 hour interval, and smoothed with a 6 hour triangular filter to produce a drift track timeseries with an estimated location error of ~200 m. Drift velocity vectors are computed from the smoothed location timeseries. The air data consists of an RM Young Platinum Temperature Probe with radiation shield, an RM Young Wind Monitor, Aanderaa compass (for correcting wind direction), and Paroscientific barometric pressure sensor. The wind data suffers from freezing during February and March of 1998 and later an apparent polar bear visit on April 25th (near 76— N, 164— W). Claw marks indicate that a bear visited the IOEB, removed the anemometer, and bent the air temperature radiation shield. The air temperature measurement does not appear to have been affected. While these data are acquired and transmitted on an hourly interval by the IOEB, characteristics of the Argos satellite system and atmospheric effects typically create gaps in the timeseries, and introduce some noise. The telemetered data have not been interpolated, but have been de-spiked using a filter which eliminates points where the first difference exceeds the standard deviation of the timeseries multiplied by three. These null values are filled with "NaN". The ice data consists of profiles of ice temperatues from US Cold Regions Research and Engineering Laboratory (CRREL) thermistors strings frozen in the icefloe approximately 1 m from the apex. Data was acquired and telemetered every 6 hours, but was also subject to reduced throughput. In late May and June, the data becomes questionable when meltwater appears to influence the thermistors strings. By July 31, the profiles are completely unreliable. These data are de-spiked and linearly interpolated every 6 hours between yearday 278 and 577, 1997. Nulls after thermistor 2 fails are filled with "NaN". The biogeochemical data are export fluxes determined in the PARFLUX laboratory at Wood Hole Oceanographic Institution (WHOI) from 21 samples at 17 day intervals, obtained by a McLane Research Mk7 Sediment Trap at 165 m below the ice surface. S97IOEB ASCII DATA FILES ioeb_hdr.s97 (555k): yearday, date, time, lon, lat, drift u, v (cm/s) ioeb_met.s97 (369k): yearday, air T (C), baro (hPa), wind e, n (m/s), buoy heading (deg), buoy tilt (deg) ioeb_ice.s97 (292k): yearday, ice thermistors 1-24 ioeb_flux.s97 (2k): sample #, open date, time, close date, time, duration (days), total<1mm flux (mg/m2/day), CaCO3 flux (umoles/m2/day), SiO2-biogenic flux (umoles/m2/day), C-organic flux (umoles/m2/day), N-total flux (umoles/m2/day), Al-total flux (umoles/m2/day) ICE THERMISTORS DEPTHS # depth (m) # depth (m) 1 -0.675 13 0.850 2 -0.175 14 0.950 3 0.050 15 1.000 4 0.300 16 1.050 5 0.400 17 1.100 6 0.500 18 1.150 7 0.550 19 1.200 8 0.600 20 1.250 9 0.650 21 1.300 10 0.700 22 1.400 11 0.750 23 1.650 12 0.800 24 2.650 MORE INFORMATION The SHEBA IOEB was funded by JAMSTEC, and supported by IOEB program partner WHOI. More information on the IOEB program is available online at , or in WHOI and JAMSTEC technical reports. Data processing was in part supported by the National Science Foundation and Office of Naval Research - High Latitude Program. We would like to extend our appreciation to the SHEBA program, chief scientists, and the officers and crew of the CCGIB Des Groseilliers and CCGIB Louis St. Laurent, for supporting the IOEB field program. Honjo, S., T. Takizawa, R. Krishfield, J. Kemp, and K. Hatakeyama, 1995, Drifting Buoys Make Discoveries About Interactive Processes in the Arctic Ocean, EOS, 76 (21) 209 & 215. Krishfield, R., K. Doherty, and S. Honjo, Ice-Ocean Environmental Buoys (IOEB); Technology and Deployment in 1991 - 1992, WHOI Tech. Rep., WHOI-93-45, 1993. Krishfield, R., S. Honjo, T. Takizawa, and K. Hatakeyama, IOEB Archived Data Processing and Graphical Results from April 1992 through November 1998, WHOI Tech. Rep. WHOI-99-12, 1999. Takizawa, T., K. Hatakeyama, T. Nakamura, S. Honjo, R. Krishfield, and N. Koyama, Report of Arctic Observational Data by Ice-Ocean Environmental Buoys (IOEB) 1 and 2 (April 1992 to July 1995), JAMSTEC Technical Report, August 1995 (in Japanese). ADDRESSES The authors should be informed of the intended use of the data and consulted as to potential scientific collaboration. Dr. Susumu Honjo Department of Geology & Geophysics Woods Hole Oceanographic Institution Woods Hole, MA 02540 Phone: (508) 289-2589 shonjo@whoi.edu Dr. Takatoshi Takizawa Japan Marine Science and Technology Center 2-15 Natsushima-cho Yokosuka Kanagawa 237 JAPAN takizawat@jamstec.go.jp Richard Krishfield Department of Geology & Geophysics Woods Hole, MA 02540 Woods Hole Oceanographic Institution rkrishfield@whoi.edu