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- Title
COASTAL LABRADOR LAND-FAST ICE: RELATIVE INFLUENCES OF THE THERMODYNAMIC FORCINGS ON THE BREAK-UP AND EFFECTS OF CLOUDS, HUMIDITY, AND WIND.
- Authors
Turnbull, Ian D.; Taylor, Rocky S.
- Abstract
Understanding the relative influences of the thermodynamic forcings and meteorology on the break-up of land-fast sea-ice is important for understanding land-fast ice environments and for broadening our understanding of the factors which control the timing of onset of seasonal break-up. Additionally, model predictions of land-fast ice break-up are of great importance to the shipping industry when the fast ice can seasonally block access to ports, as well as to inhabitants of local communities who depend on a solid winter fast ice cover for coastal travel by snowmobile. In early April 2015, two satellite-linked ice tracking buoys were deployed near the offshore edge of the land-fast ice east of Makkovik, Labrador and three tracking buoys were deployed on the fast ice east of Nain. The buoy's recorded movement in late April offshore Makkovik and in early May near Nain marked the precise timing of the onset of the land-fast ice break-up at each buoy deployment location. This study employs a one-dimensional thermodynamic ice model to explore the relative influences of thermodynamic forcing parameters on the ice during the month leading up to the fast ice break-up offshore Makkovik and Nain. The paper focuses in particular on the influences of the regional cloud cover, relative humidity and wind conditions on the timing of break-up onset through a model sensitivity analysis. The results of the analysis of the relative influences of the thermodynamic forcing components show that the fast ice break-up in both areas was most heavily influenced by the down-welling atmospheric longwave and incoming solar shortwave radiation. The results of the sensitivity analysis reveal that while relatively cloudy conditions during April 2015 most likely delayed the onset of the break-up by two to three days, humid and windy conditions during the month appeared to hasten the onset of break-up by up to two weeks.
- Subjects
NAIN (N.L.); SHORE-fast ice; THERMODYNAMICS
- Publication
Journal of Ocean Technology, 2018, Vol 13, Issue 1, p77
- ISSN
1718-3200
- Publication type
Article