Linking Radiative‐Advective Equilibrium Regime Transition to Arctic Amplification
Journal
Geophysical Research Letters
Journal Volume
52
Journal Issue
2
ISSN
0094-8276
1944-8007
Date Issued
2025-01-16
Author(s)
Abstract
Emission of anthropogenic greenhouse gases has resulted in greater Arctic warming compared to global warming, known as Arctic amplification (AA). From an energy-balance perspective, the current Arctic climate is in radiative-advective equilibrium (RAE) regime, in which radiative cooling is balanced by advective heat flux convergence. Exploiting a suite of climate model simulations with varying carbon dioxide ((Formula presented.)) concentrations, we link the northern high-latitude regime variation and transition to AA. The dominance of RAE regime in northern high-latitudes under (Formula presented.) reduction relates to stronger AA, whereas the RAE regime transition to non-RAE regime under (Formula presented.) increase corresponds to a weaker AA. Examinations on the spatial and seasonal structures reveal that lapse-rate and sea-ice processes are crucial mechanisms. Our findings suggest that if (Formula presented.) concentration continues to rise, the Arctic could transition into a non-RAE regime accompanied with a weaker AA.
Subjects
Arctic amplification
radiative-advective equilibrium
Publisher
American Geophysical Union (AGU)
Type
journal article