Representative measurements as well as those that may be locally influenced are included and identified using the obs_flag variable (see ObsPack documentation for details). Unlike GLOBALVIEW, the newer GV+ directly includes actual data provided by measurement PIs.

There are significant differences between GV+ and GV products. In most instances, reporting a single value per day for these records is no longer useful. One reason for this change is to accommodate the many high-frequency records where selection for large-scale representation is not based on time-of-day but on other criteria such as wind speed and direction, or measurements of carbon monoxide, radon and other tracers. GV+ instead reports the hourly averages when they are available. Quasi-continuous records in earlier products typically included a single value per day derived from a subset of hourly (or higher frequency) data identified by the contributing investigators as being representative of large well-mixed air masses. In some instances data sets include higher or lower time resolution as advised by the measurement PIs. In practice, this means the majority of original hourly data provided by Principle Investigators (PIs) is simply reformatted into the ObsPack framework. The most significant characteristic of GV+ is a nominal hourly time step for all high-frequency (quasi-continuous) measurements. GLOBALVIEWplus (GV+) ObsPacks are the next generation of the historic GLOBALVIEW (GV) product.

Gmd speed time found