An analytical study of nocturnal low-level jet over the Kanto plains, Japan.
- 1 January 1981
- journal article
- Published by Meteorological Research Institute, Japan Meteorological Agency in Papers in Meteorology and Geophysics
- Vol. 32 (4), 233-245
- https://doi.org/10.2467/mripapers.32.233
Abstract
From an analysis of dense pibal data in terms of time and space, it is shown that a nocturnal low-level jet exists on summer days over the Kanto plains, Japan. This will be the first presentation of an analytical study on the nocturnal low-level jet flowing over Japan. The low-level jet studied in this report is quite similar to that over the Great Plains of the United States, though it is smaller in horizontal scale. Southwest jet maxima, about 20 m s-1, occur around midnight at an altitude of 200 to 700 m. Observed wind maxima seem to be supergeostrophic in terms of large-scale pressure field. An interesting result is that as the jet flow passes over land, the amplitude of diurnal wind variations of wind speeds becomes greater with decreasing average wind speeds, the height of the maximum amplitude becomes lower, and the momentum of the jet concentrates in the relatively lower layer. A discussion referring to momentum concentration in the lower layer with time is made between the low-level jet and the nocturnal cyclonic vortex both found in the Kanto Plains.Keywords
This publication has 21 references indexed in Scilit:
- Evidence of Ekman Pumping Working in a Small Scale Cyclonic VortexJournal of the Meteorological Society of Japan. Ser. II, 1982
- An Analysis of the Nocturnal Cyclonic Vortex in the Planetary Boundary Layer of the Kanto plainsJournal of the Meteorological Society of Japan. Ser. II, 1981
- The nocturnal jetQuarterly Journal of the Royal Meteorological Society, 1977
- An Observational Study on Land and Sea Breezes in the Tokai Village AreaJournal of the Meteorological Society of Japan. Ser. II, 1974
- Diurnal Variation of Wind and Temperature Fields in the Ekman LayerJournal of the Meteorological Society of Japan. Ser. II, 1973
- Unbalanced Low-Level Jet and Solenoidal Circulation Associated withJournal of the Meteorological Society of Japan. Ser. II, 1972
- A major low‐level air current near the Indian Ocean during the northern summerQuarterly Journal of the Royal Meteorological Society, 1969
- The diurnal boundary layer wind oscillation above sloping terrainTellus, 1967
- A Boundary Layer Interpretation of the Low-level JetTellus A: Dynamic Meteorology and Oceanography, 1961
- Theoretical studies of diurnal wind‐structure variations in the planetary boundary layerQuarterly Journal of the Royal Meteorological Society, 1957