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2. In Situ Observing System
Pages 6-8

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From page 6...
... . Satellite atmospheric datasets provide temperature information globally, but only for relatively coarse vertical layers, whereas radiosondes provide high vertical-resolution climate data, but only for limited regions.
From page 7...
... 2.4 In Situ Stratospheric Observations Finding: The stratosphere is a sensitive region of the atmosphere, in which natural and human-induced climate changes appear to be more readily detected than in the troposphere (Chanin and Ramaswamy, ~ 999, Ramaswamy et al., 20001. Stratospheric temperature climate observations have been derived from a disparate set of observational platforms, many of which are in decline.
From page 8...
... scientists are currently producing global and regional pressure-level or layer-mean temperature time series based on radiosonde data in a timely manner for monitoring climate variations and trends and for comparison with satellite-derived products. The most complete database suitable for such an effort is the Comprehensive Aerological Research Dataset of daily soundings, maintained by NESDIS/NCDC, yet no temperature monitoring data products are being disseminated.


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