We find that in the mean, DOO occurs earliest in the eastern Beaufort Sea (EBS) owing to easterly winds which act to thin the ice there, relative to the western Beaufort Sea (WBS) where ice has been generally thicker.
There is no significant long-term trend in EBS DOO, although WBS DOO is in fact trending toward earlier dates.
This means that spatial differences in DOO across the Beaufort Sea have been shrinking over the past 33 years, i.e., these dates are becoming more synchronous, a situation which may impact human and marine mammal activity in the area. Holland, "Evolution of summer Arctic sea ice albedo in CCSM4 simulations: Episodic summer snowfall and frozen summers," J. Res., 120, 284-303, doi:10.1002/2014JC010149, 2015. The albedo of Arctic sea ice is calculated from summertime output of twentieth century Community Climate System Model v.4 (CCSM4) simulations.
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Finally, we find that in any given year, an increase in monthly mean easterly winds of ~1 m/s during spring is associated with earlier summer DOR of 615 days, offering predictive capability with 24 months lead time. Only the contributions to albedo from ice, snow, and ponds are analyzed; fractional ice area is not considered in this assessment.
Evolution of summer Arctic sea ice albedo in CCSM4 simulations: Episodic summer snowfall and frozen summers Light, B., S. Key factors dictating summer albedo evolution are the timing and extent of ponding and accumulation of snow.
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