# Presentation: 758985

## REGIONAL SLIDES

**REGIONAL SLIDES**

## POLAR REGION

**POLAR REGION**

- Arctic Sea Ice
- Breidamerkurjökull, Iceland
- Hubbard Glacier, United States
- Prudhoe Bay, United States
- Kolka Glacier, Russia
- Filchner Ice Shelf,  Antarctica
- Ninnis Glacier, Antarctica
- Drygalski Ice Tongue, Antarctica
- Mt. Kilimanjaro, Tanzania
- Antarctic Ozone Hole

## POLAR REGION

**POLAR REGION**

**ARCTIC**
- The core of the Arctic, in the north, is the Arctic Ocean.
- The Arctic Ocean has many thousands of big and small islands and the lands surrounding the Arctic Ocean supports a great variety of plants.

**ANTARCTIC**
- The Antarctic, in the south, is an isolated continent surrounding the South Pole. Most of Antarctica's land lies beneath ice and snow almost two km thick.
- It has high mountains and glaciers.

## Dramatic changes in Arctic Sea Ice

- Imagine an ice-free Arctic

**Notes:**
In September 2003, scientists from the United States and Canada announced that the largest ice shelf in the Arctic had broken up. The Ward Hunt ice shelf to the north of Canada’s Ellesmere Island split into two main parts, with other large blocks of ice also pulling away from the main sections. Evidence continues to emerge that average temperatures in the Arctic are rising even more rapidly than the global average. Satellite data indicate that the rate of surface temperature increase over the last 20 years was eight times the global average over the last 100 years. Studies report that the extent of Arctic sea ice has shrunk by 7.4 per cent over the past 25 years, with record-low coverage in September 2002. An analysis of 30 years of satellite data suggests that the loss of Arctic sea ice is also accelerating. There are projections that much of the sea ice, until now thought to be permanent, will melt during the summer by the end of this century if the current trend in global warming continues. This will have major direct impacts on indigenous people and Arctic wildlife such as polar bears and seals, and will also open the region to increased development pressure as access by sea to valuable natural resources becomes easier. The global impacts may also be significant as absorption of solar radiation increases, and could lead to changes in the world ocean circulation.

## Shrinking Breidamerkurjökull  Glacier Iceland

- Shrinking Breidamerkurjökull  Glacier Iceland

-  1973-2000: Images show glacier has receded and the glacial lake at its tip has enlarged

**Notes:**
During much of the 20th century, Iceland’s Breidamerkurjökull Glacier has been shrinking. It has been studied extensively since 1903, when researchers drew up detailed maps that showed its base just a few hundred metres from the ocean edge. Over time, the glacier has receded so that its base is now several kilometers from the coast. As the huge river of ice has pulled back across the Icelandic landscape, thousands of hectares of fertile farmland have been exposed and people are populating the area that was until relatively recently buried under tonnes of ice.  In this pair of satellite images, notice how the glacier has receded and the glacial lake at its tip has enlarged over time. Some researchers attribute the shrinking of Breidamerkurjökull to climate change and global warming. Other scientists maintain that the glacier is simply retreating from the advance it made during the Little Ice Age.

## North America: Angangueo

-  1986: Images show Degradation of forest area

-  2001: Between 1984 and 1999, 38 per cent of forests were degraded

- Ice dam in the Hubbard Glacier United States

-  1985 –Hubbard Glacier

-  1986 –Hubbard Glacier blocks Russell Fjord

-  2002 –Hubbard Glacier blocks Russell Fjord again
- 2003 – Glacier has retreated

**Notes:**
Hubbard Glacier, located at St. Elian National Park near Yakutat, Alaska, is the largest calving glacier in North America. It is currently increasing in total mass and advancing across the entrance of 56-km-long (35-mile-long) Russell Fjord. These images show the potential environmental disruption that a fast glacial flow is capable of producing. In 1986, the Hubbard Glacier blocked the Russell Fjord, endangering seals and porpoises by producing freshwater runoff that reduced the salinity of that body of water. Rising water levels also became a concern. By the time the ice dam eventually broke later that year, the water level of Russell Fjord had risen by 25 m (82 ft). The images show the Hubbard Glacier and surrounding area at various stages before, during, and after the formation of the ice dam.

## North America: Angangueo

-  1986: Images show Degradation of forest area

-  2001: Between 1984 and 1999, 38 per cent of forests were degraded

- Hubbard Glacier advances United States

- 14 Aug 2002

- 10 Aug 2002

**Notes:**
These photographs show an enlarged eastward-looking view of a small section of the Hubbard Glacier terminus and the evolution of the “squeeze-push” moraine in front of Gilbert Point that blocked the tidal exchange between Disenchantment Bay (bottom of photos) and Russell Fiord (top of photos), creating Russell Lake which rose to 18.6 metres (61 feet) above sea level over 21⁄2 months before it finally outburst on 14 August 2002, creating the second largest glacial lake outburst worldwide in historical times.

## Sprawl of oil fields in Prudhoe BayUnited States

- Sprawl of oil fields in Prudhoe BayUnited States

-  1974-1999: After the discovery of oil fields in 1968, the Bay has undergone dramatic changes

**Notes:**
Since the discovery of oil in Prudhoe Bay, Alaska, in 1968, the oil industry has dramatically transformed the former North American Arctic wilderness. Prudhoe Bay and 18 other oil fields currently sprawl over more than 2 600 km2 (1 004 square miles) in the region. North Slope oil fi elds now include 3 893 exploratory and producing wells, 170 production and exploratory drill pads, 800 km (497 miles) of roads, 1 769 km (1 099 miles) of trunk and feeder pipelines, two refi neries, several airports, and a collection of production and gas processing facilities, seawater treatment plants, and power plants. These satellite images document the dramatic changes that the Prudhoe Bay region has undergone over the past 35 years.

## Collapse of Kolka Glacier Russia

- Collapse of Kolka Glacier Russia

- Around Mt. Kazbek, a dormant volcano glaciers intermittently collapse, burying the landscape below

- 20 September 2002: Kolka shattered, setting off a massive avalanche of ice, snow and rocks

## Extent of disaster in Kolka GlacierRussia

- This before and after image shows the vast extent of disaster following the collapse

- Extent of disaster in Kolka GlacierRussia

## Breaking Off Filchner Ice Shelf Antarctica

- Filchner Ice Shelf is the largest ice shelf on the planet

- In 1986 the front edge of Ice Shelf broke off into three enormous icebergs

**Notes:**
An ice shelf is a huge sheet of ice that is grounded on land but has an extension that reaches out into the ocean. Antarctica has two great ice shelves: the Ross Ice Shelf near the Ross Sea and the Filchner Ronne Ice Shelf near the Antarctic Peninsula. By volume, the Filchner Ice Shelf is the largest ice shelf on the planet. In the austral winter of 1986, the front edge of the Filchner Ice Shelf broke off into the ocean, forming three enormous icebergs named A22, A23, and A24 by glaciologists. Soon after this calving event, all three icebergs ran aground on the shallow sea floor just off shore. In early 1990, however, A24 broke free and moved out into the open waters of the Weddell Sea, and finally, in 1991, into the southern Atlantic Ocean. In the 1986 image above, notice how the break line created when the icebergs calved has filled with sea ice. Sea ice does not contain the flow lines that are apparent in the glacial ice of the shelf that lies behind the break line.

## Calving of  Ninnis GlacierAntarctica

- Calving of  Ninnis GlacierAntarctica

- 22 January 2000: The Ninnis Glacier Tongue soon after the initial calving

- 5 February 2002: Iceberg split into two sections and started moving away from Ninnis  Glacier

## Cracks on Drygalski Ice Tongue Antarctica

- The ice tongue was discovered in 1902

- 21 February 2005: Drygalski calved an iceberg

- Image shows cracks formed by time and ocean currents

## Disappearing Icecap of Mt. Kilimanjaro, Tanzania

- Disappearing Icecap of Mt. Kilimanjaro, Tanzania

- Africa’s highest mountain with a forest belt having rich diversity of ecosystems

-  1976: Glaciers covered most of the summit

-  2000: The glaciers had receded alarmingly

**Notes:**
Mt. Kilimanjaro, Africa’s highest mountain, is located 300 km (186 miles) south of the equator in Tanzania. A forest belt that spans between 1 600 m (5 249 ft) and 3 100 m (10 171 ft) surrounds it. The forest has a rich diversity of ecosystems, particularly of vegetation types that result mainly from the large range in altitude and rainfall of about 700 to 3 000 mm/yr (28 to 118 in/yr). It hosts a very large diversity of species, with about 140 mammal species and over 900 plant species. But of greater concern are the glaciers atop the mountain. In 1976, glaciers covered most of the summit of Mt. Kilimanjaro. By 2000, the glaciers had receded alarmingly. An estimated 82 per cent of the icecap that crowned the mountain when it was first thoroughly surveyed in 1912 is now gone, and the remaining ice is thinning as well—by as much as a metre per year in one area. According to some projections, if recession continues at the present rate, the majority of the remaining glaciers on Kilimanjaro could vanish in the next 15 years.

## Growth of the Antarctic Ozone Hole

- Darkest blue areas represent regions of maximum ozone depletion

- 1979

- 1982

- 1984

- 1986

- 1988

- 1990

- 1992

- 1994

- 1997

- 1999

- 2004

## “Good” Ozone vs. “Bad” Ozone

- Earth's atmosphere appears to be recovering from losses of "good" ozone in the upper reaches of the atmosphere

- “Good” Ozone vs. “Bad” Ozone

- “Bad” ozone is believed to be the associated with smog and poor air quality

- Scientist observed positive changes in the ozone layer

## Thank You!

- One Planet Many People: Atlas of Our Changing Environment

**Thank You!**

- Free Download:
-  www.na.unep.net
- Purchase:
- www.Earthprint.com

**POLAR REGION**