Using the seasonal mass balance data for Glacier X in Table 1, calculate the mean annual net mass balance from 2018 to 2022.
Table 1: Seasonal Mass Balance of Glacier X (mm water equivalent, mm w.e.)
| Year | 2018 | 2019 | 2020 | 2021 | 2022 |
|---|---|---|---|---|---|
| Winter Accumulation (mm w.e.) | +1250 | +1100 | +1450 | +980 | +1120 |
| Summer Ablation (mm w.e.) | -1450 | -1620 | -1380 | -1750 | -1500 |
Shade one circle only.
−1540 mm w.e.-1540\text{ mm w.e.}−1540 mm w.e.
−360 mm w.e.-360\text{ mm w.e.}−360 mm w.e.
+360 mm w.e.+360\text{ mm w.e.}+360 mm w.e.
+1180 mm w.e.+1180\text{ mm w.e.}+1180 mm w.e.
