Temporal variability in surface mass balance (SMB) on the Greenland ice sheet is important for understanding the mass balance of the ice sheet. Additionally, knowledge of the spatial variability in SMB at ice core drilling sites helps to interpret the spatial representativeness of SMB data obtained from a single ice core. In this study, to investigate the spatiotemporal variability in recent SMB in the East Greenland Ice Core Project (EGRIP) area in the northeastern Greenland ice sheet, pit observations were made at six sites in the summers of 2016–2018. In all pits, depth profiles of water isotope ratios showed clear seasonal variations. The annual SMB differed from site to site, which is probably due to post-depositional redistribution of snow caused by wind erosion and snowdrift. However, the multiple-site averages of annual SMBs, which ranged from 134 to 157 mm w. e. yr⁻¹ (average 146 mm w. e. yr⁻¹) during 2009–2017, were very similar. This indicates that annual SMBs in the EGRIP area were nearly constant in this period. The seasonal SMBs in the EGRIP area tended to be larger in the summer–winter period than in the winter–summer period.

格陵兰冰原上的表面质量平衡（SMB）随时间变化对于理解冰原的质量平衡很重要。此外，了解冰芯钻孔现场SMB的空间变异性有助于解释从单个冰芯获得的SMB数据的空间代表性。在这项研究中，为了调查格陵兰东北冰盖的东部格陵兰冰芯项目（EGRIP）地区最近的SMB的时空变化，于2016-2018年夏季在六个地点进行了基坑观测。在所有矿井中，水同位素比的深度剖面都显示出明显的季节性变化。年度SMB随站点的不同而不同，这可能是由于风蚀和积雪导致的积雪在沉积后的重新分布。但是，每年中小型企业的多个站点平均值在2009- 2017年期间，^-1（平均146 mm we yr ^-1）非常相似。这表明在此期间，EGRIP区域中的年度SMB几乎保持不变。夏季和冬季，EGRIP地区的季节性SMB倾向于大于冬季和夏季。