The Variability of Arctic Sea Ice Extent from Spring to Summer and Its Linkage to the Decline of SIE in September

Figure 7

The anomaly distributions of SLP in July and August and their associations with the 10 highest and 10 lowest JJ and JA SIE cases over the north of 30°N: (a) a 30 yr SLP average in July for 1981–2010, (b) a 30 yr SLP average in August for 1981–2010, (c) departure of average SLP in July for the 10 highest JJ SIE cases relative to the 30 yr average SLP in (a), (d) departure of average SLP in August for the 10 highest JA SIE cases relative to the 30 yr average SLP in (b), (e) as in (c) but for the 10 lowest JJ SIE cases, (f) as in (d) but for the 10 lowest JA SIE cases, (g) Student’s -test scores of SLP in July for 10 highest and 10 lowest JJ SIE cases, and (h) as in (g) but in August for 10 highest and 10 lowest JA SIE cases.

(a) 30 yr SLP (Jul)

(b) 30 yr SLP (Aug)

(c) High JJ case

(d) High JA case

(e) Low JJ case

(f) Low JA case

(g) -test for JJ

(h) -test for JA