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Duncan Murrell - A Whale of a Time

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Duncan Murrell - A Whale of a Time

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  • Ice calving off from the tidewater glaciers of Southeast Alaska can assume just about any shape or form, that gradually metamorphoses as they melt. This was one of the most anthropomorphic icebergs that I ever came across washed up on the shore of the Le Conte inlet where the Le Conte Glacier is situated, the southernmost tidewater glacier in North America.
    Southeast-Alaska-glaciation20.jpg
  • Blue icebergs develop from older, deep glaciers which have undergone tremendous pressure experienced for hundreds of years. The process releases and eliminates air that was originally caught in the ice by falling snow. Therefore, icebergs that have been formed from older glaciers have little internal air or reflective surfaces. When long wavelength light (i.e. red) from the sun hits the iceberg, it is absorbed, rather than reflected. The light transmitted or refracted through the ice returns as blue or blue-green. Older glaciers also reflect incident light preferentially at the short wavelength end of the spectrum (i.e. blue) due to Rayleigh scattering, much in the same way that makes the sky blue.
    Southeast-Alaska-glaciation12.jpg
  • Blue icebergs develop from older, deep glaciers which have undergone tremendous pressure experienced for hundreds of years. The process releases and eliminates air that was originally caught in the ice by falling snow. Therefore, icebergs that have been formed from older glaciers have little internal air or reflective surfaces. When long wavelength light (i.e. red) from the sun hits the iceberg, it is absorbed, rather than reflected. The light transmitted or refracted through the ice returns as blue or blue-green. Older glaciers also reflect incident light preferentially at the short wavelength end of the spectrum (i.e. blue) due to Rayleigh scattering, much in the same way that makes the sky blue.
    Southeast-Alaska-glaciation17.jpg
  • Blue icebergs develop from older, deep glaciers which have undergone tremendous pressure experienced for hundreds of years. The process releases and eliminates air that was originally caught in the ice by falling snow. Therefore, icebergs that have been formed from older glaciers have little internal air or reflective surfaces. When long wavelength light (i.e. red) from the sun hits the iceberg, it is absorbed, rather than reflected. The light transmitted or refracted through the ice returns as blue or blue-green. Older glaciers also reflect incident light preferentially at the short wavelength end of the spectrum (i.e. blue) due to Rayleigh scattering, much in the same way that makes the sky blue.
    Southeast-Alaska-glaciation18.jpg
  • Blue icebergs develop from older, deep glaciers which have undergone tremendous pressure experienced for hundreds of years. The process releases and eliminates air that was originally caught in the ice by falling snow. Therefore, icebergs that have been formed from older glaciers have little internal air or reflective surfaces. When long wavelength light (i.e. red) from the sun hits the iceberg, it is absorbed, rather than reflected. The light transmitted or refracted through the ice returns as blue or blue-green. Older glaciers also reflect incident light preferentially at the short wavelength end of the spectrum (i.e. blue) due to Rayleigh scattering, much in the same way that makes the sky blue.
    Southeast-Alaska-glaciation15.jpg
  • I think that this was the only time that I ever saw a glacier that had melted like this into very symmetrical fluted ridges. I haven’t found an explanation for this peculiar phenomenon.
    Southeast-Alaska-glaciation7.jpg
  • Blue icebergs develop from older, deep glaciers which have undergone tremendous pressure experienced for hundreds of years. The process releases and eliminates air that was originally caught in the ice by falling snow. Therefore, icebergs that have been formed from older glaciers have little internal air or reflective surfaces. When long wavelength light (i.e. red) from the sun hits the iceberg, it is absorbed, rather than reflected. The light transmitted or refracted through the ice returns as blue or blue-green. Older glaciers also reflect incident light preferentially at the short wavelength end of the spectrum (i.e. blue) due to Rayleigh scattering, much in the same way that makes the sky blue.
    Southeast-Alaska-glaciation13.jpg
  • Blue icebergs develop from older, deep glaciers which have undergone tremendous pressure experienced for hundreds of years. The process releases and eliminates air that was originally caught in the ice by falling snow. Therefore, icebergs that have been formed from older glaciers have little internal air or reflective surfaces. When long wavelength light (i.e. red) from the sun hits the iceberg, it is absorbed, rather than reflected. The light transmitted or refracted through the ice returns as blue or blue-green. Older glaciers also reflect incident light preferentially at the short wavelength end of the spectrum (i.e. blue) due to Rayleigh scattering, much in the same way that makes the sky blue.
    Southeast-Alaska-glaciation16.jpg
  • Blue icebergs develop from older, deep glaciers which have undergone tremendous pressure experienced for hundreds of years. The process releases and eliminates air that was originally caught in the ice by falling snow. Therefore, icebergs that have been formed from older glaciers have little internal air or reflective surfaces. When long wavelength light (i.e. red) from the sun hits the iceberg, it is absorbed, rather than reflected. The light transmitted or refracted through the ice returns as blue or blue-green. Older glaciers also reflect incident light preferentially at the short wavelength end of the spectrum (i.e. blue) due to Rayleigh scattering, much in the same way that makes the sky blue.
    Southeast-Alaska-glaciation14.jpg
  • Blue icebergs develop from older, deep glaciers which have undergone tremendous pressure experienced for hundreds of years. The process releases and eliminates air that was originally caught in the ice by falling snow. Therefore, icebergs that have been formed from older glaciers have little internal air or reflective surfaces. When long wavelength light (i.e. red) from the sun hits the iceberg, it is absorbed, rather than reflected. The light transmitted or refracted through the ice returns as blue or blue-green. Older glaciers also reflect incident light preferentially at the short wavelength end of the spectrum (i.e. blue) due to Rayleigh scattering, much in the same way that makes the sky blue.
    Southeast-Alaska-glaciation19.jpg
  • Harbor seals show variable movement patterns depending on their sex and age class, with some exhibiting considerable localized travel but noseasonalpatterns,whileothersshowmoreextendedmovements,particularlyduringthewinter. Seasonaluseofglacialfjords,wheremanyfemalesaggregateto give birth on icebergs in the summer, is common. Satellite tagging studies have shown that pups may range up to 232 miles (374 km) from their birth site, although most movements are less than 62 miles (100km) away. Juvenile seals can make more extensive movements of up to 186-310 miles (300-500 km) away from their tagging location; however, most remain within 100km. Adult seals typically make shorter movements and on average are within 37 miles (60km) of their tagging site. More recent tagging of seals that occupy glacial fiords has revealed movements of seals from one glacial fiord to another as well as one extensive movement of a juvenile female seal from Glacier Bay in southeastern Alaska to Prince William Sound, an estimated straight-line distance of ~ 520 miles (830 km). As more seals are being satellite-tagged, much more information is becoming available about winter and summer movements.
    Alaska-harbour-seal2.jpg
  • The harbor seal (Phoca vitulina), a widespread species in both the north Atlantic and Pacific oceans, is found in Alaska along the coast extending from Dixon Entrance north to Kuskokwim Bay and west throughout the Aleutian Islands. Harbor seals, and other phocid (true) seals, also are called “hair” seals, which helps distinguish true seals from fur seals. Harbor seals haul out of the water periodically to rest, give birth, and nurse their pups. In winter seals spend up to 80% of their time in the water. In spring and summer they spend more time hauled out during pupping and moult season. Reefs, sand and gravel beaches, sand and mud bars, and glacial, pan ice, and sea ice are commonly used for haul-out sites. The moulting lines on these seals are clearly visible.
    Alaska-harbour-seal1.jpg
  • Anthropomorphic iceberg, LeConte Inlet, Southeast Alaska, USA<br />
.<br />
Ice calving off from the tidewater glaciers of Southeast Alaska can assume just about any shape or form, that gradually metamorphoses as they melt. This was one of the most anthropomorphic icebergs that I ever came across washed up on the shore of the Le Conte inlet where the Le Conte Glacier is situated, the southernmost tidewater glacier in North America.
    Alaska-glaciation20.tif
  • Large fluted iceberg in Le Conte Inlet, Southeast Alaska, USA.<br />
<br />
I think that this was the only time that I ever saw a glacier that had melted like this, into very symmetrical fluted ridges. I haven’t found an explanation for this peculiar phenomenon.
    ice-3.tif
  • Ancient “blue” iceberg, Le Conte Inlet, Southeast Alaska, USA.
    ice-2.tif