Anomaly — Science definition

Defined in 2 courses:

Where it is taught

In use

An anomaly is a difference from a reference value, not the total temperature.

Climate Evidence, Trends & Projections

An anomaly is a difference from a chosen baseline mean, not an absolute temperature.

Climate Data, Trends & Attribution

Questions using anomaly

Problem 1

A mean is 12.4°C and its baseline is 12.0°C. Find the anomaly.
Answer and explanation

0.4 °C

12.4 − 12.0 = 0.4.

Problem 2

An observed annual temperature is 16.4 °C and its matched baseline is 15.8 °C. Find the anomaly. A separate future scenario curve gives +1.2 °C at year 20. Explain what must be supplied before comparing the values.
Answer and explanation

The observed anomaly is +0.6 °C. The projection must specify the same variable, region, baseline and averaging interval, plus its scenario/assumptions. An observation and a conditional future model remain different kinds of evidence.

Subtract 16.4−15.8 = +0.6 °C.

Check matching baseline, coverage and time definition.

Identify projection assumptions and distinguish modeled future values from observations.

Response criteria

  • Use the stated measurements or conditions, with correct units.
  • Connect the result to the physical mechanism or evidence relationship.
  • Identify the assumption, model limit or further evidence requested.

Problem 3

A mean of 18.1°C is compared with a baseline of 17.3°C. Find anomaly.
Answer and explanation

0.8 °C

18.1 − 17.3 = 0.8.

Problem 4

Independent chapter check: An observed annual temperature is 16.4 °C and its matched baseline is 15.8 °C. Find the anomaly. A separate future scenario curve gives +1.2 °C at year 20. Explain what must be supplied before comparing the values.
Answer and explanation

The observed anomaly is +0.6 °C. The projection must specify the same variable, region, baseline and averaging interval, plus its scenario/assumptions. An observation and a conditional future model remain different kinds of evidence.

Subtract 16.4−15.8 = +0.6 °C.

Check matching baseline, coverage and time definition.

Identify projection assumptions and distinguish modeled future values from observations.

Response criteria

  • Use the stated measurements or conditions, with correct units.
  • Connect the result to the physical mechanism or evidence relationship.
  • Identify the assumption, model limit or further evidence requested.

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