Integrated Observations |
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The observational system must be an integrated mix of satellite and
non-satellite systems. These systems complement each other in a variety
of ways--satellites provide the global coverage frequently inaccessible
to surface-based measurements, while surface measurements can achieve
greater spatial and/or temporal resolution, as well as measure
parameters inaccessible to satellites and provide information on earlier
periods in Earth system history. The USGCRP agencies are leading
contributors to the national and global observing system. The
determination of long-term trends and the requirement for measurement
consistency place enormous burdens on the measurement systems in terms
of calibration and validation, as well as the need for transparency in
algorithm and instrument knowledge. In implementing its measurement
programs, the United States follows wherever possible the Monitoring
Principles established by the Global Climate Observing System. The collection of observational data and their importance to global change research makers the long-term stewardship of data an essential part of the observational program. Not only is the volume of these data sets ever-increasing, but they also come from a multiplicity of sources. All of these data sets must be archived and disseminated in ways to conveniently facilitate their long-term use by the full range of user communities, especially by those involved in truly multidisciplinary scientific, adaptation, and assessment work. |