Reply One can also distinguish the footprint of a satel- lite image and the resolution of features in the imag- I would like to thank Mr. Durran and Mr. Walters ery. Consider an infrared satellite image whose for their extended comments on the difference between footprint is 12 km. Suppose further that thunderstorms grid spacing and resolution by Grasso (2000). are seen in the image. In this situation thunderstorms Mr. Walters provided further detailed information are also said to be poorly resolved in the imagery. and references to support statements about the differ- I would like to reiterate that the main focus of the ence between grid spacing and resolution. The objec- recent article was to discuss the difference between tion by Mr. Durran is well noted; however, he may grid spacing and resolution. Although no definition of have misunderstood the focus of the recent article. resolution was offered in Grasso (2000), Mr. Durran is correct in stating that no precise definition exists for The main focus of the article was to distinguish between the length scale between grid points and the resolution in regards to numerical modeling. length scale of information simulated on a gridded domain. Consider a numerical domain with 5-km hori- zontal grid spacing and 100-m vertical grid spacing. References Let the domain extend from the surface to 20 km in Grasso, L. D., 2000: The differentiation between grid spacing and height and 200 km in each horizontal direction. resolution and their application to numerical modeling. Bull. Suppose the domain is initialized horizontally homo- Amer. Meteor. Soc., 81, 579-580. geneously with a sounding that has 3000 J kg"1 of con- vective available potential energy and vertical shear of 10 -2s _1 . Allow a warm bubble to trigger convec- tion. This domain will support a convective updraft fro m the boundary layer to the tropopause. Even though the convective updraft exists within the do- LEWIS D . GRASSO main, a supercell thunderstorm is said to be poorly COOPERATIVE INSTITUTE FOR RESEARCH IN THE ATMOSPHERE resolved. FORT COLLINS, COLORADO K / In section 3a of the article "Loss of Life in the United States Associated with Recent Atlantic Tropical Cyclones," by E. N. Rappaport (Bull Amer. Meteor. Soc., 81, 2065-2073), the number of drowning deaths was reported incorrectly. Drowning accounted for 488 of the 600 fatalities associated with Atlantic tropical cyclones during 1970-99. In the August issue of the Bulletin, Kevin E. Trenberth was erroneously listed as an editor for Earth Inter- actions. Dr. Michael Manton replaced Dr. Trenberth as an Earth Interactions editor in 2000. Dr. Manton's contact information is Dr. Michael Manton, Bureau of Meteorology Research Centre, GPO Box 1289K, Melbourne 3001, Australia. The Bulletin apologizes for this error. Bulletin of the American Meteorological Society 2339
Bulletin of the American Meteorological Society – American Meteorological Society
Published: Oct 1, 2000
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