Issues in the Integration of Research and Operational Satellite Systems for Climate Research Part II. Implementation (2000) / Chapter Skim
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Data Continuity
Data Continuity
Pages 20-28
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From page 20... ...
Not only do gaps create noncontinuous time series, but they also prevent the performance of a key climate analysis function, that is, the calculation of relative instrument bias from data collected simultaneously when a new spacecraft replaces an old. In other words, overlapping observations give an opportunity for old and new spacecraft to be simultaneously calibrated against a common target (Earth)
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From page 21... ...
polar orbiters in both 1330 and 1930 orbits, alternating between the two nodes, to merge data from nine satellites into a time series of daily global atmospheric temperatures. The duration of most overlapping periods was 1 to 3 years; however, two periods were less than 7 months long.
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From page 22... ...
empirical orthogonal functional analyses of the patterns of change whose time series correlated with LECT variations. However, there remains some uncertainty owing to the possible convolution of real interannual changes in OLR or HRC during a drifting period and changes caused by the diurnal cycle alone.
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From page 23... ...
Data Sets Should Be Uniformly Archived and Continuously Available A significant impediment to the construction of continuous, space-based climate data sets is the lack of attention given to the archiving methodology. Often, investigators must piece together observational data sets held at various locations, written in various formats, and residing on various media before work can begin.
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From page 24... ...
In cases where operational quality is not compromised, it is recommended that the backward compatibility of proposed radiances with currently archived radiances be considered as a climate requirement. NPOESS REPLENISHMENT STRATEGY The first lesson listed above (overlapping observations)
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From page 25... ...
From the perspective of future generations, the points addressed below become necessary considerations because having useful long-term time series in the future is dependent on obtaining good data from monitoring that is accomplished now. The points discussed in the following four sections speak directly to the requirements for climate quality records stated in NRC (1999~.
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A particular concern centers on the consequences of a gap in solar irradiance measurements between the planned NASA SORCE (Solar Radiation and Climate Experiment) mission in mid-2002 and follow-one in the NPP/NPOESS era.
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. A roadmap for international cooperation to achieve the climate science requirements for surface vector winds awaits multiagency approval and support (see Milliff et al., forthcoming)
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From page 28... ...
Large. "Global ocean surface vector wind observations from space," in OCEANOBS-99, Proceedings of the International Conference on the Ocean Observing System for Climate, Centre National d'Etudes Spatiales (CNES)
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