Jökull

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Jökull - 01.12.1970, Qupperneq 55

Jökull - 01.12.1970, Qupperneq 55
This map is at a scale of 1:15,000 with 10 m contour intervals making it very accurate. It also reveals the glacial topography on Breida- merkursandur making it easy to estimate the maximum advance of the glacier. Some measurements of the glacial thinning. During July 22—26, 1968 the author stayed to- gether with B. Adalsteinsson at the nunataks Esjufjöll in Vatnajökull. The lowering of the glacier margin was measured at 15 localities. On July 27 the author together with F. Björns- son of Kvísker walked along the eastern margin of Breidamerkurjökull and up to the ice-damm- ed lake of Vedurárdalslón which at that time was quite empty (Fig. 4) because it had bursted some days earlier. In this trip the lowering of the glacier margin was measured in three places on the western flanks of Vedurárdalsfjöll. In locating the measuring points the following criteria were preferred. It had to be a rather steep slope (>15° dip), where the uppermost lateral marks of the recent iceflow were distinct and obvious. They should form a straight line for at least 200 m. The present ice edge should be even and its slope along the flank almost parallel with the uppermost flow marks. These conditions could be fulfilled except for the lowest measuring point on the western side of Vedurárdalsfjöll, where it proved to be diffi- cult to determine the elevation of the present glacier margin, and at the middle point at the west side of Vesturbjörg in Esjufjöll where the uppermost marks were irregular because of less slope (ca. 8°—10°). The measurements were per- formed with a Paulin aneroide altimeter with a measuring accuracy of ± 0.5 m. The air pres- sure was very stable during these days and repeated measurements never differed more than ± 1 m. The results of these measurements are represented in Table 1. The measurements TABLE 1 - TAFLA 1 The lowering of Breidamerkurjökull from its maximum thickness at the end of the last centurv according to the measurements performed by the author on July 23—27, 1968 Þynning Breiðamerkurjökuls frá hámarksþykkt hans í lok s.l. aldar samkvœmt þynningarmœl- ingum höfundar dagana 23.-27. júlí 1968 Measuring locality Present elevation of the ice surface Núverandi hæð The quality of the locality Gæði Lowering, m Þynning, Esjufjöll, Austurbjörg, NE jökuls, m y. s. 960 mælistaðar Fair m 44 ,, ,, E 870 Excellent 50 }> >) E 800 Excellent 42 ,, , SW 850 Good 34 „ Esjubjörg, E 840 Excellent 32 ,, ,, SW 860 Fair 37 ,, ,, SW 940 Good 35 „ Skálabjörg, NE 860 Good 51 ,, ,, E 720 Excellent 68 „ E 650 Excellent 71 ,, , SW 650 Good 57 „ Vesturbjörg, E 700 Excellent 51 ,, ,, S 800 Good 23 ,, „ sw 870 Fair 31 ,, sw Excellent 29 Fellsfjall, NW 300 Fair 43 Útigönguháls, w 380 Excellent 49 Fauski, NW 530 Good 35 JÖKULL 20. ÁR 53
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Jökull

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