(a) Calculate the number of grid cells in the atmospheric component of the HadGE
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Question
(a) Calculate the number of grid cells in the atmospheric component of the HadGEM2-ES's climate model described in Box 15.1.
(b) At the equator, HadGEM2-ES's ocean component has grid cells measuring 1o in longitude and 0.33o latitude. What's the actual size of such a cell?
BOX 15.1 | An Earth System Model UIuw1I The Hadley Centre of the U.K.'s Met (for "meteo the model climate-including seasons. A coupled rological") Office is home to some of the world's carbon-cycle model accounts for carbon flows on most sophisticated climate modeling hardware and timescales up to centuries. A sulfur-cycle model software. HadGEM2-ES-for Hadley Centre Global handles sulfate aerosols, whose negative forcing Environment Model 2 Earth System-is a state-of- exerts a cooling effect, while non-sulfate aerosols the-art climate model performing calculations to are handled by a separate model component. The be featured in the IPCC Fifth Assessment Report. atmospheric chemistry component follows 46 dif HadGEM2-ES's atmospheric component features a ferent chemical species. With all that calculating, arid of 192 points in longitude, 144 points in latitude, HadGEM2-ES takes a full hour of supercomputer and 38 vertical levels. That's over a million separate time to simulate a month's climate variation. f boxes to describe the atmosphere alone! The ocean you'd like to contribute some computer time to cli- onent includes a horizontal resolution ranging mate modeling efforts, check out Research Prob- from 0.33 at the equator to 1° at higher latitudes, lem 3; it describes a global project that harnesses and 40 levels of depth. In a major advance over ear spare computing power in tens of thousands of per- lier models, HadGEM2-ES treats 9 different types of Sonal computers to run large-scale climate models, comp cetation, each of which responds to changes in ncluding some from the Hadley Centre. veExplanation / Answer
a)
grid cells
192 points in longitude and 144 points in latitude
so total grid cells= 192x144 grid cells
b)
The oceanic component has a latitude-longitude grid with a longitudinal resolution of 1 degree, and latitudinal resolution of 1 degree between the poles(90o) and 30o of North and South. Then it increases to one third of a degree at the equator and so total there is 360 x 216 grid points.
The oceanic component = 360 x 216 grid points
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