δ¹⁸O, δ²H, deuterium excess and protease activity of Mikhail hill, vicinity o...

δ¹⁸O, δ²H, deuterium excess (dexc), and protease activity (PA) in snowpacks at different elevations of Mikhail hill, vicinity of Anadyr Town, Chukchi Peninsula楚科奇半岛阿纳德尔镇周边米哈伊尔丘陵不同海拔积雪层中的氧同位素δ¹⁸O、氢同位素δ²H、氘盈余（deuterium excess，缩写dexc）以及蛋白酶活性（protease activity，缩写PA）数据集