In previous work, air measurements from planes and a sparse network of monitoring towers have revealed that the inventory - based numbers are coming in low — roughly 50 percent low. (sciencedaily.com)
Given reliable measurements, as outlined in Recommendation # 1, the level of confidence that can be attached to the trends will increase as the period of record of upper air measurements lengthens. (nap.edu)
Law Dome is useful for bridging the gap between our direct air measurements and the longer, lower resolution ice core records such as EPICA and Vostok. (realclimate.org)