
Photograph taken from the deck of the Antarctic krill trawler ‘Juvel’ .Sunshine Glacier is on the left with the Rime Crests of Coronation Island covered in clouds. March 2011












Photograph taken from the deck of the Antarctic krill trawler ‘Juvel’ .Sunshine Glacier is on the left with the Rime Crests of Coronation Island covered in clouds. March 2011
Photographed in the Kgadigadi Transfrontier Park using my Sony Alpha 700 camera with the incredibly …

Icebergs. A Study in Light and Composition.
During my many sea trips down to Antarctica, I am constantly attracted to the amazing colours, sculptural shapes and reflected light surfaces of icebergs, as they silently drift by.
I have listened to many theories and explanations of why icebergs are the colour, texture and shape they are from my shipmates and fellow officers. They mostly appear to be confused, oversimplified and often distorted myths.
Most icebergs consist of many layers of snow, which consists of ice crystals. When sunlight falls on these crystals, they reflect the light like tiny mirrors, creating the same colour as the incident light. If this light is slightly blue as in early sunrise, the bergs reflect blue light. The frozen ice contains tiny air bubbles, the surface of which also reflects light. These appear white when reflecting full sunlight.
Some Icebergs contain bluish streaks. These are caused by melt water, which has re-frozen during the period when the iceberg was still a glacier. This water has flowed into crevasses in the glacier as it slowly moves its way towards the sea, where it finally breaks off or ‘calves’. The crevasses or holes are filled with air, reflecting the light and appearing blue.
Glaciers consist of hundreds of thousands of years of compressed snow and ice, which constantly undergo re-freezing and thawing. At the base of the glacier, the pressure is so immense (due to the weight of the ice above); any air that is trapped by the snow crystals is forced out.
As this happens, the reflective surfaces of the snowflake crystals become compacted and sometimes disappear. These kinds of icebergs contain minimal reflective surfaces as the light travels straight through.
The energy of a photon is directly related to the frequency of light it contains. Blue (high frequency photons) contain more energy than red (low frequency) photons. The order is reduced as we go down the spectrum with orange, yellow, green, blue, indigo and violet.
Water molecules in their free state exist in three vibrational modes, symmetrical stretch, symmetrical bend and asymmetrical bend.
As white light travels through water, the red/orange/yellow components become absorbed, whilst the blue (high frequency) photons pass directly through. This slightly increases the water temperature (caused by these vibrating water molecules). This blue water effect is the only known example of colour caused by vibrational transition. Mostly colour is caused by photons of light interacting with electrons.
The same spectral selection occurs when white light travels through snow or ice, this is the blue colour we see in deep glacial crevasses and icebergs. The shape, chemical composition of sea water (including substances dissolved in it), the illuminating light angle, and surface structure (melted and re-frozen water) all influence the iceberg’s colour.

Coronation Island, is the largest of the South Orkney Islands, reaching 4,153? (1,266m) above sea level. While it is largely covered by ice, Coronation Island also is home to some tundra habitat, and is inhabited by many seals, penguins and seabirds.

The South Orkney Islands
The archipelago comprises four main islands. Coronation Island (the largest), covering about 48; its highest point is Mount Nivea which rises to 1,266m above sea level. Laurie Island is the eastern-most of the islands. The other two main islands are Powell Island and Signy Island. Smaller islands in the group include Robertson Island, the Saddle Islands, and Acuna Island. The total area of the archipelago is about 620 km2, of which about 90 percent is glaciated.
The Inaccessible Islands are situated about 15 nmi (17 mi; 28 km) to the west and are also considered part of the South Orkneys.
The climate of the South Orkneys is generally cold, wet, and windy. Summers are short and cold (December to March) when the average temperatures reach about 2 °C (36 °F) and fall to about -10 °C (14 °F) in winter (i.e., in July). The extrema reach about 12 and -44 °C (53.6 and -47.2 °F) respectively. The seas around the islands are ice-covered from late April to November.
Despite the harsh conditions the islands do support vegetation and are part of the Scotia Sea Islands tundra ecoregion, along with South Georgia and the South Sandwich Islands, the South Shetland Islands and Bouvet Island. All these islands lie in the cold seas below the Antarctic convergence. These areas support tundra vegetation consisting of mosses, lichens and algae, while seabirds, penguins and seals feed in the surrounding waters.
The above photograph was taken from the Antarctic krill trawler using my Sony Alpha 700 and 70-400 Sony ‘G’ lens.

Signy Island is a small sub-antarctic island in the South Orkney Islands group located at 60°43?S 45°36?W. It is about 6.5 km long and 5 km wide with volcanic peaks which rise to 288 m (945 ft) above sea level. Much of the island is permanently covered with ice. The average temperature range is 0 °C (32 °F) to about ?10 °C (14 °F) in winter (i.e., in July). The extremes reach about 12 and -44 °C (53.6 and -47.2 °F).
Signy Island was named by the Norwegian whaler Petter Martin Mattias Koch Sørlle after his wife Signy Therese.
The British Antarctic Survey maintains the Signy Research Station, a scientific station for research in biology. The base was opened on March 18, 1947, on the site of an earlier whaling station that had existed there in the 1920s. The station was staffed year-round until 1996; since that year it has been occupied only from November to April. It houses 10 people.
This photograph was taken from an Antarctic krill trawl vessel, the Juvel when I was working on-board researching Antarctic Krill.

Iceberg, Southern Ocean, Mid-Daylight and Clouds. Light plays over icebergs and the ocean near Coronation Island, South Orkney’s, Antarctica.

A lone Chinstrap Penguin clings onto the giant iceberg.

Chinstrap Penguins
Their name derives from the narrow black band under their heads which makes it appear as if they are wearing black helmets, making them one of the most easily identified types of penguin. Chinstrap Penguins grow to 68 cm (27 in) in length, and a weight of 6 kg (13.2 lbs); however, their weight can drop as low as 3 kg (6.6 lbs) depending on the breeding cycle. Males are both larger and heavier than females. Their diet consists of krill, shrimp and fish, for which they swim up to 80 km (50 miles) offshore each day. They live on barren islands and large icebergs of the sub-Antarctic Region and the Antarctic Peninsula; however, they generally require solid, snow-free ground to nest on. The Chinstrap Penguin’s primary predator is the leopard seal. There are 12 – 13 million chinstrap penguins. They have an average life span of 15 – 20 years. Chinstrap Penguins are considered the most aggressive penguin. Other names for them are “Ringed Penguins”, “Bearded Penguins”, and “Stonecracker Penguins” due to their harsh call.”
The scientific base, Machu Picchu is maintained by Peru. This is a scientific research installation on King George Island in Admiralty Bay, which conducts annual scientific expeditions to Antarctica. The base carries out a variety of scientific projects such as research into krill and its potential as an alternative human food source, as well as geological, biological, hydrographic, and geophysical research, under the provisions of the Antarctic Treaty. The base operates radar measuring the winds in the upper atmosphere, supplying data on the deteriorization of the ozone layer.
As Antarctica is a continent of valuable strategic, ecological, and economic importance, Peru has an interest in maintaining its status as a non-militarized, nuclear-free zone of peace, and in preserving its environment, which is important to the Peruvian climate. Its frigid waters, the origin of the Humboldt Current, are essential to Peru.
Since 1988, maintenance, supply, and transport of personnel for the base have been performed by the Instituto del Mar de Perú’s scientific research vessel BIC Humboldt.
I photographed the base from the deck of our departing vessel on the last day of our 2 month voyage here in September 2010.


Admiralty Bay is situated on the western shore of King George Island, part of the South Shetland Islands. archipelago. It is located close to the northern tip of the Antarctic Peninsula in the Maritime Antarctic climatic zone. Cape Horn of South America is about 900 km to the north. The island is dominated by a pervasive ice cap with more than 90% of the island being glaciated. The ice-free areas and coastal zones of the island include diverse flora and fauna including penguins, seals, petrels and relatively rich tundra vegetation. Admiralty Bay, is registered as an Antarctic Specially Managed Area (ASMA).
It is typical of a bay/fjord settings in the South Shetland Islands. The ice-free areas within the bay are formed by pebble-cobble beaches, moraines, mountainous peninsulas, rocky islets, spurs and nunataks. The terrain is heavily shaped by glacial and coastal marine processes. The area of Admiralty Bay is representative of the terrestrial, limnic, coastal, near-shore, pelagic, and fjord bottom ecosystems of KGI. Plants are mostly mosses (about 70 species), liverworts (22 species), and two flowering plants, and fungi and lichens (almost 300 species) are common. Twenty-four species of birds and six species of pinnipeds have been identified in the area, but only thirteen species of birds and three species of pinnipeds breed in the area. The bay ecosystem reflects the general environmental conditions prevailing in the South Shetland Islands, with rocky shores covered by extensive subtidal macroalgal communities. There is a unique site, Napier Roc, where a rich and highly diverse benthic invertebrate fauna is found. Fish are represented by fifteen species of Nototheniidae. The peninsula region is also the area in Antarctica experiencing the most rapid and pervasive global warming on our planet. KGI is a mesocosm of the change that is occurring in response to climate warming and a test- bed for predicting future responses to climate change.