Figure 3.6 Heterogeneities in daytime 850 hPa relative humidities over Hilo, Hawaii. At A
(1957) the sounding times changed from 03Z and 15Z to 00Z and 12Z. At B (1965) carbon
hygristors and new housings introduced. Solar heating of the new housing lowered the
reported daytime relative humidity. At C (1973) the housing was improved to avoid solar
heating. From Elliot and Gaffen (1991).
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