Jökull - 01.01.2020, Side 19

Hannesdóttir et al.
Table 3: Comparison of area change and rates of area change for the main ice caps and glaciers and groups of intermediate-
size glaciers (divided according to their ∼2000 area), excluding the small glaciers (shown in blue in Figure 1). The rates
of area change for each time interval is based on the actual time period, which varies between the ice caps and glaciers
(see Table 2). The maximum LIA of Drangajökull is dated to ∼1850. Although a few glaciers on Tröllaskagi belong to
the intermediate-size category in terms of their size, their outlines are only available for a limited number of years, and
they are therefore not included here. – Samanburður á flatarmálsbreytingu og hraða flatarmálsbreytingar fyrir stærri jökla
landsins (jöklum minni en 3 km2 er sleppt). Hraði flatarmálsbreytingar er reiknaður samkvæmt árafjölda hvers tímabils
sem er mismunandi eftir hverjum jökli fyrir sig (sjá töflu 2). Drangajökull náði hámarksútbreiðslu um 1850. Þrátt fyrir að
nokkrir jöklar á Tröllaskaga falli í miðlungs stærðarflokkinn eru þeir ekki teknir með hér þar sem útlínur þeirra eru ekki
tiltækar á mörgum mismunandi árum.
∼1890– 1945/46– ∼1973– ∼2000– ∼2010– 2014–
1945/46 ∼1973 ∼2000 ∼2010 ∼2014 2019
Total glacier area
Total area change (km2) −999 −272 −194 −404 −175 −179
Total area change (%) −7.93 −2.35 −1.71 −3.63 −1.63 −1.70
Rate of change (km2 a−1) −18.2 −9.72 −7.19 −40.4 −43.8 −35.9
Rate of change (% a−1) −0.14 −0.08 −0.06 −0.36 −0.41 −0.34
Vatnajökull
Total area change (km2) −463 −112 −93 −241 −67 −94
Total area change (%) −5.27 −1.34 −1.13 −2.97 −0.85 −1.20
Rate of change (km2 a−1) −8.42 −3.98 −3.43 −21.9 −22.3 −18.8
Rate of change (% a−1) −0.10 −0.05 −0.04 −0.27 −0.28 −0.24
Langjökull
Total area change (km2) −101 −61 −10.4 −24.6 −34 −26.4
Total area change (%) −9.24 −6.15 −1.12 −2.67 −3.79 −3.06
Rate of change (km2 a−1) −1.84 −2.18 −0.39 −3.51 −4.86 −5.28
Rate of change (% a−1) −0.17 −0.22 −0.04 −0.38 −0.54 −0.61
Hofsjökull
Total area change (km2) −90 −25 −31 −40 −27 −15.1
Total area change (%) −8.67 −2.59 −3.40 −4.50 −3.13 −1.83
Rate of change (km2 a−1) −1.64 −0.88 −1.65 −4.46 −4.45 −3.02
Rate of change (% a−1) −0.16 −0.07 −0.18 −0.50 −0.52 −0.37
Mýrdalsjökull
Total area change (km2) −84 −45 −10.9 −34.4 −22.7 −18.8
Total area change (%) −11.4 −6.90 −1.80 −5.77 −4.04 −3.49
Rate of change (km2 a−1) −1.53 −1.61 −0.57 −3.13 −5.68 −3.76
Rate of change (% a−1) −0.21 −0.20 −0.09 −0.52 −1.01 −0.70
Drangajökull
Total area change (km2) −109 −12.9 −1.9 −2.4 0.05 −6.3
Total area change (%) −40.4 −8.02 −1.28 −1.64 0.08 −4.38
Rate of change (km2 a−1) −1.1 −0.46 −0.07 −0.34 0.03 −1.26
Rate of change (% a−1) −0.43 −0.27 −0.04 −0.23 0.02 −0.88
Eyjafjallajökull
Total area change (km2) −29.4 −4.6 −1.4 −8.2 −2.9 −3.4
Total area change (%) −25.3 −5.31 −1.71 −10.2 −4.01 −4.89
Rate of change (km2 a−1) −0.53 −0.16 −0.07 −0.91 −0.73 −0.68
Rate of change (% a−1) −0.46 −0.15 −0.08 −1.13 −1.00 −0.98
Intermediate-size glaciers (∼10–40 km2, n=7)
Total area change (km2) −10.0 −0.95 −1.87 −2.65 −0.65 −0.75
Total area change (%) −29.4 −4.49 −7.69 −9.41 −13.76 −4.28
Rate of change (km2 a−1) −0.17 −0.03 −0.07 −0.30 −0.15 −0.15
Rate of change (% a−1) −0.95 −0.16 −0.37 −1.55 −1.09 −0.83
Intermediate-size glaciers (∼3–10 km2, n=5)
Total area change (km2) −3.46 −0.78 −1.10 −1.19 −0.22 −0.28
Total area change (%) −36.1 −12.3 −19.8 −29.4 −12.8 −5.34
Rate of change (km2 a−1) −0.06 −0.03 −0.05 −0.13 −0.06 −0.06
Rate of change (% a−1) −0.78 −0.37 −0.83 −3.21 −2.50 −1.07
16 JÖKULL No. 70, 2020