Criteria for assessing climate change impacts on ecosystems

Area of Science:

• Ecology
• Climate Science
• Environmental Modeling

Background:

• Growing concern exists regarding climate change effects on species and ecosystems.
• Extensive research has been conducted to assess these potential impacts.

Purpose of the Study:

• To propose criteria for reliable and useful assessments of future climate change impacts.
• To evaluate existing literature based on these proposed criteria.

Main Methods:

• Defined key criteria for impact assessments, including emissions scenarios, climate model selection and evaluation, GCM variability, ecosystem model choice, transient vs. equilibrium responses, CO(2) effects, and spatial representation.
• Surveyed existing literature against these criteria.

Main Results:

• Many studies utilize outdated climate models and fail to assess model skill or bias.
• Ecosystem models often neglect CO(2) effects on plant responses, particularly in niche studies, overestimating negative impacts.
• Simplified spatial scales and insufficient model comparisons lead to underestimated refugia and a false sense of precision.

Conclusions:

• Most current climate change impact assessments do not meet proposed criteria for reliability and usefulness.
• Improvements are needed in model selection, uncertainty quantification, and consideration of ecological processes for accurate forecasting.