Other
Scientific paper
May 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agusm.a51b..03m&link_type=abstract
American Geophysical Union, Spring Meeting 2004, abstract #A51B-03
Other
0300 Atmospheric Composition And Structure, 1600 Global Change
Scientific paper
The most intrinsic nature of atmospheric motion as a geophysical fluid may be that the motion is a natural convection which is confined by strong gravity between two rotating concentric spherical shells. Two important factors which create this nature are considered as atmospheric baroclinicity and planetary beta effect. Both factor commonly due to spherical shape of the Earth. The baroclinicity creates not only the westerlies but also its meander. And the beta effect practice re-distribution of vorticity in planetary scale by using properties of planetary waves. The Earth's general circulation is maintained and changed through these actions. In traditional annular rotating water tank experiment, various regime of fluid motion were observed. However, the latitudinal structure is primarily decided, because its device has channel shape. In our preliminary dishpan type experiment, inner cooling cylinder is slimed down extremely. It was found that the flow field makes abrupt transition from axisymmetric to unaxisymmetric beyond a critical value of rotating speed. However we also can't discuss about spherical effect for latitudinal structure, because its device has no beta effect. On the other hand, in rotating dishpan experiment with not barolinicity but planetary beta effect only, it was found that the polar vortex sudden reversal (stratospheric sudden warming) is easily simulated. However, it is not a spontaneous general circulation model, because initial polar vortex and planetary waves are excited compulsorily. Motive of this study is to deepen the understanding of non-periodic phenomena such as abnormal weather or the blocking. The first step purpose of this study is development of new type rotating dishpan experiment system with not only baroclinicity but also planetary beta effect. Main result of our experiment are as follows. 1: By the analysis of surface flow field, it was found that the axisymmetricity break down according to the increase of system rotating speed. And this critical value is shifted to higher rotation side according to the increase of temperature difference between heating and cooling sections. And this tendency is consistent with the traditional annular experiment. 2: By analysis of inner structure of flow and temperature field, it was found that the westerly flow is more strong according to increase of height from the bottom and also the westerlies is more strong according to increase of temperature difference between heating and cooling sections. The relationship of flow and temperature field is consistent with the thermal wind relation. Thus, the basic structure of troposphere in the Earth's atmosphere was realized by laboratory experiment. Further development of this experiment is expected in order to understand various non-linear and non-periodic phenomena in the Earth's atmosphere.
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