Citazione Originariamente Scritto da Alessandro1985 Visualizza Messaggio
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Finally, we consider the zonal-mean temperature and zonal wind responses. Sea ice loss induces the strongest warming north of 60°N and in the lower troposphere (below 700 hPa). In contrast, SST change induces warming over all latitudes and throughout the troposphere, with the greatest warming in the tropical upper troposphere (Figs. 4i,j). Sea ice loss weakens the zonal-mean zonal wind on the poleward side (50°–65°N) of the climatological jet stream and strengthens it on the equatorward side (30°–40°N), which implies an equatorward shift of jet stream (Fig. 4f). On the contrary, ocean warming induces a weakening on the equatorward side and strengthening on the poleward side of the climatological jet stream, implying a poleward shift of jet stream (Fig. 4g). Thus, sea ice loss and SST change have opposing influences on the jet latitude, as reported in previous papers (e.g., Screen et al. 2022). The CO2 direct radiative forcing induces a significant weakening of zonal-mean zonal wind between 30° and 55°N but no obvious shift in the jet latitude (Fig. 4h).
Leggere come i due effetti opposti si annullino a vicenda mi ha fatto richiamare alla mente quell'episodio dei Simpson in cui il signor Burns faceva una visita medica e fecero l'esempio di tutti i germi che vogliono entrare insieme attraverso la porta rimanendo però nel farlo tutti incastrati e dunque impediti ad entrare