0000015431 00000 n 0000000016 00000 n 0000058396 00000 n Using the graph, what is the maximum ablation amount in ft/year? Figure 1: Decadal mean of mass balance for alpine glaciers reporting to the WGMS Figure 2: Time series and annual mass balance of alpine glacier … 0000013628 00000 n Methods of measuring mass balance! A glacier average density of 850±60 kg m-3 has been used to convert the volume change into mass budget(Huss,2013). 0000020162 00000 n Mass balance is the total sum of all the accumulation (snow, ice, freezing rain) and melt or ice loss (from calving icebergs, melting, sublimation) across the entire glacier. Measurements began on South Cascade Glacier, WA in 1958, expanding to Gulkana and Wolverine glaciers, AK in 1966, and later Sperry Glacier, MT in 2005. Ice continues to be transferred from the top of the glacier (the accumulation zone) to the bottom of the glacier … 0000002164 00000 n Glacier (and ice sheet) Mass Balance! 0000001077 00000 n :9_�A�^rN�L�Y�B|p|j}/�#9����{~�I^[�Sd������n|t�d�j�q���呢CE�T�#0.���s1�`B��Z% cr%���V���&*�m�}�ıɟ��zLJ��cgC_QIib�a�y(G1uP���ǧ�#���v�S����6� F� ��i�g�M$�=�7>q�3@���Yۡ�}� �l!K�X37?^�����|4gYf��H�/���) ����O���xp�Gv�\����JU6A(�_�7�Bss)0(݂q=�A+�ͣ���J�p�.�����>6�x?��ʫ8c�5"E�G�2�F��L@���h�����C�sxg�ӸԒ[Ir��%��J���"@��� GGH�5TuN �s~J�i4�x��.42|L���ab�]j%шebARcP_͎͑�x�v�/�"������?�y��~���'�-ҷ�-ҷh�OŐ!s3��Q�Ј�K��Y�{��B?��UNZ����̦�x~3Io�'���׋�&].��oM:4i�$e����H�G�Wq⒀�V They constitute important seasonal and long-term hydrologic reservoirs, providing water for hydropower, agriculture, and municipal use (Guido et al., 2016; Ragettli et al., 2016; Milner et al., 2017; Pritchard, 2019) Glaciers can also be a significant natural hazard, especially for regions … 0000001822 00000 n 0000022075 00000 n Negative values indicate a net loss of ice and snow compared with the base year. GlaciersA Cesar Melendez Presentation 2. • A mass of ice accumulating over the years on land from the recrystallization and compaction of snow, slowly deforming and flowing due to stresses induced by their weight, creating crevasses, seracs, … Airborne and satellite remote sensing is the only practical approach for deriving a wide area, regional assessment of glacier mass balance. An annual average amount of melt of 25.4 6 0.021 m w.e. (Leiva et al., 2007). 0000055976 00000 n 1228 B. Schaefli and M. Huss: Hydrologic model with point glacier mass balance glacier mass balance (Braun and Renner, 1992; Koboltschnig et al., 2008; Konz et al., 2007). Mass balance can be thought of as the ‘health of a glacier’; glaciers losing more mass than they receive will be in negative mass balance and so will recede. 0000014526 00000 n 5 0 obj Using the graph that appears, what is the maximum accumulation amount in ft/year? 0000017179 00000 n periods. If the mass of snow accumulated on a glacier exceeds the mass of snow and ice lost during summer months, the mass balance is positive. This dataset shows the cumulative change in mass balance of a set of “reference” glaciers worldwide beginning in 1945. Point Thickness changes 9 1.2. Unconfined: ice sheet/cap, ice shelf, ice stream o Thermal Temperate (melting @ base due to high T. Use stakes, GPS, or cameras to measure annual winter accumulation (Oct 1 - Apr 31, typ.) trailer Generally, glaciers are retreating due to global warming, yet glaciers in the Karakoram–Kunlun Shan region remain stable or have even gained mass. 0 ft/year Question 2. GLY 1104 – Water: Mountains to Sea Lab Exercise 6: Glaciers STUDENT ANSWER SHEET PART 1: GLACIER MASS BALANCE Question 1. Positive mass balance of the glacier was dominant during the period 1989–1993, and the accumulated mass balance reached 970 mm. In Part B you will determine ha around the world. •difference between accumulation and ablation is the net mass balance •Balance year is interval between time of minimum mass balance one year to the mimimum the next year Equilibrium means glacier has to transfer mass … The mass balance, or the difference between snow accumulation and snow and ice ablation, is crucial to glacier health and its survival. Glaciers gain mass through snowfall and lose mass through melting and sublimation (when water evaporates directly from solid ice). 0000021017 00000 n �u.~�&4�̋�z���} 0000004065 00000 n x?0r10 ™6è3.àe`}ÁÌÀØÁ°‡Q¬!ÛÁ¶C!”ƒ™I†‰™á[CõK±Áî{­ZDz¢ófCW×ìL´Ãö0$4È0($ô)ðK0Ø0ì`èapk`m`B To see if a glacier is growing or shrinking, glaciologists check the condition of snow and ice at several locations on the glacier at the end of the melt season. xí{y`Tå¹÷ûžsfËL2K2{–&“„L’I2نä$™Ä„ 8IX2h@e‘ˆàF#EE¬Ð¡µíÇ Ðk°ÖF¯¥È%Š×Z[¡.¥V Dates do not vary at a given glacier, but may vary from glacier to glacier. The scientists check snow levels against stakes they’ve inserte… The annual average amount of mass balance was 24.7 6 … 0000015208 00000 n The mass balance for the glacier is then estimated by multiplying the changes in mass balance at each sampling point with the area that point represents, and summing the product over the entire glacier. 0000014283 00000 n 0000014977 00000 n %%EOF Schaefli et al. This irregularity is often called the Karakoram anomaly and was first noticed by Hewitt (2005) before being confirmed by subsequent geodetic studies. (2005) were among the first to include annual glacier-wide mass balance data into a rigorous multi-signal parameter estimation proce-dure. Glacier mass-balance data from the Antarctic Peninsula (AP) region are very scarce due to the logistical difficulty involved, the relatively large glacier areal extent and the extreme weather conditions throughout the year. The total net mass balance of a glacier (B1 ) 1 1.5. %���� Negative values indicate a net loss of ice and snow compared with the base year of 1945.