Key Parameters


1. Meteorology1.1.   Air temperature, °C

  • Estimated air temperature of the coldest five-day period.
  • Average air temperature of the coldest days.
  • Absolute minimum air temperature.
  • Absolute maximum air temperature.

1.2.   Air Humidity

  • Average annual air humidity.
  • Air humidity. of the coldest month.
  • Air humidity. of the warmest month.

1.3.   Operational Wind Statistics

  • Wind recurrence with respect to velocity intervals and directions, by months, in ice and ice-free periods, for the entire year.
  • The number of days a year with wind speeds of 4, 8, 10, 12, and 15 m/sec.
  • Average and maximum duration of wind conditions by speed intervals.
  • A vertical wind speed profile for a layer of up to 100 m high.

1.4.   Wind Extreme Statistical Characteristics

  • Wind speed with 1, 5, 10, 25, 50 and 100-year return periods and averaging intervals of 10 min at a height of 10 m.
  • Wind gust speed of 1, 5, 10, 25, 50 and 100-year return periods measured at a height of 10 m with averaging intervals 3-5 sec.

1.5.   Duration and dates of navigation period, by month

  • Maximum duration.
  • Minimum duration.
  • Average duration.

1.6.   Precipitation

  • Distribution of precipitation by months.
  • Average monthly and extreme values of snow cover thickness.

1.7.   Visibility

  • Number of days with fog estimated by months and by fog duration, in hours.

1.8.   Icing

  • Frequency of icing.
  • Number of days with icing.
  • Amount of ice per 1 sq. m of horizontal surface.
  • Amount of ice per 1 sq. m of vertical surface.
  • Thickness of the glaze ice wall versus its height above the sea level .

2.   Oceanography2.1.   Water Temperature

  • Water temperature by seasons (by horizons, including bottom one).
  • Absolute maximum water temperature.
  • Absolute minimum water temperature.

2.2.   Seawater Salinity And Transparency (By Seasons)2.3.   Sea Level Operational Statistics

  • Tidal regime.
  • Observation analysis.

2.4.   Extreme Sea Level Characteristics

  • Highest and lowest astronomical tides relative to the mean sea level.
  • Extreme positive and negative surges predicted to occur once in 5, 10, 25, 50 and 100-years.
  • Estimated minimum and maximum sea level values relative to the mean sea level, predicted to occur once in 5, 10, 25, 50 and 100 -years.
  • Seasonal sea level variations.
  • Recommended estimated maximum sea level at the storm of 100-year return period and wave height probability of 0.1%.

2.5.   Sea Currents Operational Statistics

  • Recurrence of velocities and directions of the total sea currents at no less than three horizons, obtained from the observation data.
  • A general scheme of sea currents in the operation area with details by seasons at not less than three horizons; a detailed scheme for the surface horizon based on typical wind conditions.

2.6.   Characteristics Of Maximum Sea Current Velocities

  • Estimated maximum velocities of total sea currents with an indication of direction, predicted to occur once in 5, 10, 25, 50 and 100-year periods at no less than three horizons, including the near-bottom one.
  • Maximum tidal currents velocities at the indicated horizons.

2.7.   Wave Operational Statistics

  • Wave probability (%) by months, and for entire year.
  • Duration of storms and weather windows for wave heights above and below the specified threshold.
  • Swell waves characteristics.
  • Wave spectral characteristics.
  • Orbital velocities.

2.8.   Wave Extreme Statistics

  • Estimated wave parameters – average, 50%, 13%, 3%, 1%, and 0.1% probability, with “n”-year return period (n = 1, 5, 10, 25, 50 and 100 years).
  • Estimated periods and wave lengths corresponding to wave heights n year return period.
  • Exceedance of the wave crest of 0.1% probability with “n” year return period.
  • Hazardous wave directions, the most probable direction of maximum estimated waves.

2.9.   Combined extremes of the main hydrological parameters