In The Arctic, AMO/NAO ‘Predominantly Force Ocean Temperatures’ And ‘Cause Major Melting Events’
By Kenneth Richard on 1. October 2018
1. Natural variability/NAO/AMO “predominantly force ocean temperatures†and Greenland ice sheet melt
Hahn et al., 2018
“North Atlantic Natural Variability Modulates Emergence of Widespread Greenland Melt in a Warming Climate … Using reanalysis data and a large ensemble of climate model simulations, we find that a negative North Atlantic Oscillation and positive Atlantic Multidecadal Oscillation consistently promote heightened summer melt under various forcing conditions. Moreover, timing of widespread 21st century Greenland melt varies considerably between ensemble members due to different phasing of these modes of natural variability. These results indicate the importance of natural modes of variability across a range of external forcing conditions for interannual melt variability and the emergence of widespread Greenland melt. … North Atlantic warming in high melt years is driven by the negative NAO rather than the AMO (Hurrell & Deser, 2010). Downward (upward) turbulent heat flux anomalies over warmer (colder) ocean regions during high melt seasons further suggest that NAO-related wind and heat fluxes predominantly force ocean temperatures.â€
http://notrickszone.com/2018/10/01/in-the-arctic-amo-nao-predominantly-force-ocean-temperatures-and-cause-major-melting-events/
