I. Introduction A network of automatic data buoys for monitoring synoptic-scale fields of pressure, temperature, and ice motion throughout the Arctic Basin was recommended by the U.S. National Academy of Sciences in 1974. Based on the Academy's recommendation, the Arctic Ocean Buoy Programme was established by the Polar Science Center, University of Washington, in 1978 to support the Global Weather Experiment. Operations began in early 1979 and the program continued through 1990 with funding from various agencies. In 1991, the Arctic Ocean Buoy Programme was superseded by the International Arctic Buoy Programme (IABP), although the basic objective remains the same: to establish and maintain a network of drifting buoys in the Arctic Ocean to collect data needed for real-time operations and meteorological and oceanographic research. Annual reports on this data were published from 1979 through the present. II. Data Processing Data for these reports were processed as outlined in the 1986 data report with the exception that we have reverted to 3-hourly interpolation of sea-level pressure and air temperature. The average daily temperature was calculated from these eight measurements; an asterisk in the tabular data indicates that one or more of these measurements was not available. APPENDIX: AVAILABLE DATA SETS Data Set AB: Twelve-hourly pressure and temperature fields. These data can be read with the following FORTRAN statements: INTEGER LAT, LD, LH, LONG, LM, LY, PX, PXX, PXY, PY, PYY REAL EP, ET, P, T READ (,1) LY, LM, LD, LH, LAT, LONG, P, T, EP, ET, PX, PY, PXX, PXY, PYY 1 FORMAT (4I3, I4, I5, F8.1, F7.1, 2F5.1, 2I5, 3I6) LY is the year less 1900. Ie. LY = 92. LM is the month; 1 for January, 2 for February, etc. LD is the day of the month. LH is the hour in GMT; LH = 0 or 12. LAT is the latitude in degrees north. LONG is the longitude in degrees east. P is the interpolated pressure in millibars. T is the interpolated temperature in degrees Celsius averaged from LH -12 to LH + 12 hours. EP is the interpolation error variance in millibars squared. ET is the interpolation error variance in degrees Celsius squared. PX, PY are the pressure derivatives times 10^3 in the x and y direction. PX and PY are in units of millibars per 10^3 kilometers. PXX, are the interpolated second derivatives of PYY, pressure times 10^6. Units are in millibars per PXY 10^6 kilometers. Data Set C: Daily buoy positions. These data can be read with the following FORTRAN statements: INTEGER ID, LD, LH, LM, LY REAL LAT, LONG READ (,1) LY, LM, LD, LH, ID, LAT, LONG 1 FORMAT (4I3, I5, F7.3, F9.3) LY is the year less 1900. Ie. LY = 92. LM is the month; 1 for January, 2 for February, etc. LD is the day of the month. LH is the hour in GMT; LH = 0 or 12. ID is the buoy identification. LAT is the latitude in degrees north. LONG is the longitude in degrees east. Data Set D: Interpolated ice velocity fields. This data set contains ice velocity estimates at a fixed grid of points. The data can be read with these FORTRAN statements: INTEGER LAT, LD, LH, LM, LONG, LY REAL DUDX, DUDY, DVDX, DVDY, SIGMA2, UX, UY READ (,1) LY, LM, LD, LH, LAT, LONG, UX, UY, SIGMA2, DUDX, DUDY, DVDX, DVDY 1 FORMAT (4I3, I4, I5, 2F7.1, F5.1, 4F8.2) LY is the year less 1900. Ie. LY = 92. LM is the month; 1 for January, 2 for February, etc. LD is the day of the month. LH is the hour in GMT; LH = 0 or 12. LAT is the latitude in degrees north. LONG is the longitude in degrees east. UX is the interpolated ice velocity in the x direction in cm/s. UY is the interpolated ice velocity in the y direction in cm/s. SIGMA2 is the variance of the interpolation error in velocity, in dimensionless units. No confidence should be placed in interpolated velocities for which SIGMA2 > 0.5. DUDX, DUDY, are interpolated velocity derivatives expressed in DVDX, DVDY Cartesian coordinates. After multiplication by 10 -7 the reported values have units of s-1. Note on Coordinates: The pressure and velocity derivatives are expressed with respect to a rectangular coordinate system with the origin at the North Pole, the x axis coinciding with the Greenwich Meridian, and the y axis with the 90E Meridian. The transformation from latitude and longitude to x and y is: x = 110.949 (90 - lat) cos (long) y = 110.949 (90 - lat) sin (long) where x and y are in kilometers and latitude and longitude are in degrees. Availability: These data sets are archived at the World Data Center A: Glaciology and can be obtained on magnetic tapes as described below or via anonymous FTP. Inquiries should be addressed to: National Snow and Ice Data Center CIRES, Campus Box 449 University of Colorado Boulder, Colorado 80309 U.S.A. Telephone (303) 492-5171 The authors can be contacted at: University of Washington Polar Science Center 1013 N.E. 40th Street Seattle, WA 98105 U.S.A. Telephone (206) 543-1300 FOREWORD The International Arctic Buoy Programme (IABP) is funded and managed by its participants. Representing eight countries, participants include operational and research agencies, meteorological and oceanographic institutes, and nongovernmental organizations. Participant contributions include equipment, services, and program coordination, as well as funding. IABP participants are: Alfred-Wegener Institute for Polar and Marine Research Germany Arctic and Antarctic Research Institute Russia Christian Michelsen Research Norway Meteorological Service of Environment Canada Canada Assisted by other agencies including: Polar Continental Shelf Project Canadian Coast Guard Canadian Forces Institute of Ocean Sciences International Arctic Research Center U.S. Japan Marine Science and Technology Center Japan Marine Environmental Data Service Canada National Ice Center U.S. Representing: National Aeronautics and Space Administration National Science Foundation National Oceanic and Atmospheric Administration Office of Naval Research Naval Meteorology and Oceanography Command U.S. Naval Oceanographic Office U.S. Norsk Polarinstitutt Norway Norwegian Meteorological Institute Norway Pacific Marine Environmental Laboratory U.S. Polar Science Center / Applied Physics Laboratory / U.S. University of Washington Service Argos France U.K. Meteorological Office U.K. Woods Hole Oceanographic Institution U.S. World Climate Research Programme / international World Meteorological Organization Intergovernmental Oceanographic Commission international International Council of Scientific Unions international ACKNOWLEDGMENTS The International Arctic Buoy Programme is partially funded through the U.S. Interagency Arctic Buoy Programme (USIABP). We are grateful to David Benner of the U.S. Navy/NOAA National Ice Center, Chairman of USIABP, for his continued support of the data handling portion of the IABP. Preparation of the latest reports and archiving of the data were funded through NOAA/NIC contract 50-DGNC-2-00128.