Figure 4

(a,b) Surface temperature difference between the urban site (NOA) and the coastal stations CS3 (a) and CS4 (b), during HWs and the preceding and following NHW periods. (The NHW periods correspond to 1, 3, 4, 14, 16–18, 20, 21 and 28–30 of August 2012 at CS3 and 3, 4, 14, 16–18, 20, 21, 28 and 29 of August 2012 at CS4, depending on availability of satellite data. The HW periods correspond to 5–9 and 22–27 of August 2012 at CS3 and CS4).