Air content along the Greenland Ice Core Project core: A record of surface climatic parameters and elevation
Air content along the Greenland Ice Core Project core: A record of surface climatic parameters and elevation
复制标题
DOI：
10.1029/97jc01908
复制
发表时间：
1997-11
影响因子：
2.2
通讯作者：
D. Raynaud;C. Ritz;P. Martinerie
中科院分区：
文献类型：
--
作者：
D. Raynaud;C. Ritz;P. Martinerie
我们在此介绍沿格陵兰冰芯项目 (GRIP) 冰芯进行的冰空气含量 V 的测量。长期趋势的主要特征是（1）末次盛冰期和全新世早期之间减少了13%，（2）全新世期间增加了8%。结果根据大气压力、表面高度和关闭时孔隙率的变化进行了讨论。 V 记录包含过去表面高程变化的重要信号，与冰盖建模模拟的质量一致。它表明格陵兰岛中部在末次盛冰期到全新世早期的过渡期间增厚，而在全新世时期则显着变薄。它还强调了冰孔隙度变化对过去 V 变化的巨大影响，这不能用当前与温度的空间关系来解释，并且可能反映其他表面气候参数（如降水季节性或风应力）的变化。还评估了大气压力模式的时间变化的潜在作用。超过 110 ka 的 GRIP 冰中的空气含量结果表明，其值与过去 40,000 年观测到的值大致在相同范围内，通常较高的空气含量对应于同位素较温暖的冰。
We present here measurements of the air content of the ice, V, performed along the Greenland Ice Core Project (GRIP) ice core. The main features of the long-term trends are (1) a decrease of 13% between the last glacial maximum (LGM) and the earliest part of the Holocene, and (2) an increase of 8% during the Holocene. The results are discussed in terms of changes in atmospheric pressure, surface elevation and porosity at close-off. The V record contains a significant signal of past changes of surface elevation in qualitative agreement with ice sheet modeling simulations. It suggests a thickening of central Greenland during the transition from the LGM to the early Holocene, and a significant thinning through the Holocene period. It also stresses the large influence on past V variations of changes in ice porosity, which are not explained by the present-day spatial relationship with temperature and may reflect changes in other surface climatic parameters (like precipitation seasonality or wind stress). The potential role of temporal variations of atmospheric pressure patterns is also evaluated. Air content results in the GRIP ice older than 110 ka indicate values approximately in the same range as those observed during the last 40,000 years, with generally higher air content corresponding to isotopically warmer ice.