Contribution of Atmospheric Advection to the Amplified Winter Warming in the Arctic North Atlantic Region

Figure 5

(a) Difference in 850 hPa temperature between an average day when an ATL-box trajectory reached Ny-Ålesund and an average day for non-ATL-box trajectories, multiplied by the increase in fraction of ATL-box days from P1 to P2 (second term on the right in (1)) for ERA-Interim. (b) The same analysis as (a), but as a vertical plot based on temperatures from the Ny-Ålesund long-term radiosonde record. Grey shading indicates the 95% confidence level.

(a)

(b)