On the structure of pressure systems
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Authors
Alden, Robert F.
Rosenberger, Glenn C.
Haltiner, G.J.
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1965-05
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Abstract
The three-dimensional distribution of vertical velocity and "isobaric" velocity divergence are numerically evaluated
for a number of synoptic situations using Northern Hemisphere data at 1000, 850, 700, 500, and 300 mb. The
results indicate that in the typical migratory nondeveloping cyclone only moderate values of divergence exist both in
the low and high troposphere with minimum values near 500 mb. On the other hand, a developing cyclone, which
deepened markedly at sea level but only slightly in the upper troposphere, displayed much larger values of divergence
and vertical velocity, about double; and the level of minimum divergence lowered to 600-700 mb. In addition, a new pair of positive and negative divergence centers appeared parallel to the east coast of the
United States prior to the intensification which took place in the immediate neighborhood.
Similar calculations for a blocking situation gave small values of vertical velocity and divergence in a broad area
in the vicinity of the high pressure ridge as contrasted to the normal migratory anticyclonic system.
Finally, computations of thermal advection with the divergent wind showed it to be as much as half of the nondivergent
advection at 850 mb., but relatively smaller at upper levels.
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Monthly Weather Review, Vol. 93, No. 5, pp. 297-305, May 1965.
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This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.