Basal Slippage

•Divide your A3 sheet into four.

•Copy the sketch diagram as it progresses.

•When prompted , swop your sheet with a partner and begin a new diagram on a new

section of the A3 sheet.

•The process will increase in speed with each diagram.

Snow fall

Accumulates and

compresses – ice sheet

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Ice sheet flow out onto the sea- ice

shelf.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Ice sheet flow out onto the sea- ice

shelf.

Calving occurs in summer

Iceberg

Snow fall

Accumulates and

compresses – ice sheet

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Ice sheet flow out onto the sea- ice

shelf.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Ice sheet flow out onto the sea- ice

shelf.

Calving occurs in summer

Iceberg

Snow fall

Accumulates and

compresses – ice sheet

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Ice sheet flow out onto the sea- ice

shelf.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Ice sheet flow out onto the sea- ice

shelf.

Calving occurs in summer

Iceberg

Snow fall

Accumulates and

compresses – ice sheet

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Ice sheet flow out onto the sea- ice

shelf.

Snow fall

Accumulates and

compresses – ice sheet

Pressure causes basal

melt.

Ice sheet moves-Lubricated due to

basal melt and gravity- basal

slippage.

Ice sheet flow out onto the sea- ice

shelf.

Calving occurs in summer

Iceberg