A glacier as witness: watching UNESCO’s film from the Pamirs
A UNESCO recording presents the great glacier of the Pamirs as a witness to change. What a glacier is, why it matters downstream and what to watch for.
The video on this page is titled Fedchenko (Vanch-Yakh) Glacier: Witness to Change in Central Asia. UNESCO published it on its official YouTube channel. The title gives the glacier two names and makes one claim about it: that this body of ice has something to tell the whole region.
The glacier lies in the Pamir mountains of Tajikistan, inside the Tajik National Park, which is on the UNESCO World Heritage List. UNESCO’s description of the park calls it the longest valley glacier in the world outside the polar regions. This guide explains what that means and why a glacier can be called a witness; it does not retell the film.
Where the ice lies
The park covers the east of Tajikistan, at the centre of what geographers call the Pamir Knot, the meeting point of the highest mountain ranges of Eurasia. UNESCO describes high plateaux in the east and rugged peaks in the west, with extreme swings of temperature between the seasons. The area is sparsely inhabited, shaken by frequent strong earthquakes and almost untouched by farming.
A valley glacier is a river of ice. Snow that falls high in the mountains and does not melt is pressed into ice over many years, and the ice slowly flows down a valley under its own weight. UNESCO calls the Pamirs a major centre of glaciation on the Eurasian continent, with a great many glaciers, rivers and lakes.
Why a glacier is a witness
A glacier lives in a balance between the snow it gains and the ice it loses to melting. When that balance shifts from year to year, the glacier thickens or thins, advances or retreats. This is why scientists measure glaciers so carefully: the ice records changes in climate that are hard to see from one season to the next.
The ice also matters far from the mountains. Meltwater from high glaciers feeds rivers in the warm season, just when fields and towns downstream need water most. In a dry region such as Central Asia, what happens to mountain ice is a question for the lowlands as well.
As you watch, keep three questions in mind. What kinds of change does the film speak of, and over what span of time? Who is speaking — people who study the ice, or people who live downstream of it? And what does the film present as firmly known, and what does it leave open?
