The mass balance measurement network covers a glacier's entire accumulation zone with a consistent distribution of measurements (Figure 2 and 3). (nichols.edu)
We used these dates because this is the time period when we have the available resources to complete the dense measurement network. (nichols.edu)
Other stations of the global CO2 measurement network show almost exactly the same; the most important regional variation is the greatly subdued seasonal cycle at stations in the southern hemisphere. (realclimate.org)