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B. Haurwitz

The effect of clear and cloudy days, and of days with large and small temperature ranges on the daily pressure variation at Bermuda is investigated. It is shown that the various harmonic components are not significantly affected by the different weather conditions contrary to what has been found for continental stations. Such an independence from the local weather situation is to be expected over the oceans, especially in the case of the semidiurnal pressure oscillation. The results strengthen the explanation given by Chapman for the occurrence of the semidiurnal pressure maximum two hours before solar transit through the meridian.

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B. Haurwitz
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B. Haurwitz
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B. HAURWITZ

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B. Haurwitz

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B. Haurwitz

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B. Haurwitz

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It is shown on the evidence of observational material that the simplifications necessary in order to derive the equation for the isallobaric wind are not justified, because the neglected terms in the equations of motion, viz., the convective terms and the local derivatives of the geostrophic deviation, are of the same order of magnitude as the terms retained in the equations. Hence the concept of the isallobaric wind has to be abandoned. Consequently the convergence ahead of moving cyclones and the divergence behind, in the lower troposphere, cannot be explained by means of the isallobaric-wind relation. It is shown that the distribution of the acceleration of motion in moving pressure systems offers an explanation of the observed distribution of convergence and divergence.

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B. Haurwitz

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B. Haurwitz

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