The continuous satellite sea-ice record begins

node

Passive-microwave sensors give, for the first time, a consistent daily measure of sea-ice extent in both hemispheres regardless of cloud or darkness - which is precisely what makes a polar winter measurable. Everything this Journey can say about how the two hemispheres differ over time rests on this record, and the record is short: it is now several decades long, against a system with variability on decadal and longer scales.

A node is not a place. Drawing it on a map would assert something about the world that no stored fact supports.

Read in · 1

Life at the PolesNature

Evidence · 1

Sea Ice Index

Timeline

No dated observations are stored for this object. Atlas shows what was observed and when — it does not infer a history.

Connections · 3

Sea Iceconcerns
Arctic Oceanconcerns
Antarcticaconcerns

Assembled narrative · 1

An assembled narrative is available for this object.

Observed changes · 0

No public Signals are attached to this object. Signals show what changed and when it was observed — never a direction or a rank.

Actions

Read the assembled narrative Continue in StudioOpen TwinTwin does not start a decision from this kind of object.ShareSaveSaved objects are part of the authenticated projection, which is declared and not yet built.

/atlas?object=EVT_POLES_SATELLITE_ICE_RECORD_1979