phase 4 report - DNV

RN02: DESIGN OF FLOATING STRUCTURES IN ICE // PART 3 ANNEX BAnnex B (informative) Regional informationB.16 Barents SeaB.16.1 Description of regionThe division is not suitable for ice conditions. The proposed one may be better suited as it follows more closelythe ice conditions.B.16.2 Barents Sea technical informationB.16.2.3 Sea ice and icebergsThere is need for some guidance in cases where data are not available. The proposed supplementary tables wereused by OGP/ISO in the calibration study for ISO 19906 ( OGP, 2010).The Russian sources mentioned in the Guidance document, Clause B.16.2.3 is based on data and observationsof sea ice and icebergs that go back decades. AARI holds much of these data, of which a parts are proprietary.Nevertheless, AARI provided the data that is in ISO 19906.The first occasional observations of sea ice in Barents Sea started in the first half of the 19th century. Occasionalaerial ice reconnaissance in the Barents Sea started in late 1920s. From 1934 it was conducted on the regularbasis in certain winter months and monthly in the summer period. After 1992 regular aerial reconnaissance hadstopped.Satellite ice observations in the Barents Sea started in 1972. From 1972 to 1985 satellite observations wereperformed on a monthly basis in the period from November to May and each 10 days in the period from June toSeptember.In total 40 field surveys were performed in the period from 1980 to 1990, most of them in the Northern part ofthe Barents Sea passing across the Shtokman area.In 1991–92 Russian Arctic researchers in co-operation with foreign partners conducted complex field study of seaice and icebergs in the central and northern sections of the Barents Sea. In particular, iceberg drift was studied inthe area of Franz Joseph Land, Spitsbergen and Novaya Zemlya using 20 Argos drift buoys.The main results of these observations are:• Sea ice occurrence in the Barents Sea and its seasonal and annual variability.• General information about ice edge location, concentration, ridging, floe configuration andsize, ice drift, snow cover, as well as main iceberg parameters and their sources.• General information about sea ice temperature, salinity, density, physical, morphologicaland mechanical properties, texture and structure and sea ice drift.60RUSSIAN–NORWEGIAN COOPERATION PROJECT