Joshi, Indira (Indian Institute of Tropical Meteorology, Pune, India)
Pathan, J.M. (same affiliation)
Tinmaker, MI.R. (same affiliation)
On 23 January 1982 a close circulation centre near 33.0░N, 19.5░E was apparent in the NOAA 7 image. On 26 January, the system deepend at a rate of 0.5 mbar/hr and intensied with 1005 mbar pressure and 50 knots winds from 160 degrees at 37.0░N, 19.5░E. To study the association between the temperature, wind and pressure systems of the mediterranean cyclone with high, middle and low latitude pressure, temperatures and wind monthly mean surface pressures, temperatures of December 1981, January 1982 and monthly mean winds (u,v) at 500 mbar, 100 mbar and 50 mbar for December 1981 and January 1982 data were collected from 1░N to 60░N latitudes and 2░E to 130░E longitude from monthly climatic data for the world. Also collected the data of tropical cyclonic storms formed during December 1981 and January 1982. There were 10 tropical storms during December 1981 to the end of Januray 1982. In these 10 storms one tropical cyclone Abigail formed on 22 January 1982 off the South Queensland coast and intensified into a cyclonic storm on 26 January 1982 on the same dates mediterranean cyclone formed and intensified. Correlation coefficients were computed between high and low-latitude temperatures, winds and pressures at surface, 500 mb, 100 mb and 50 mb levels.
From the above study it is seen that during January 1982 a very good correlation exists between high and low-latitude surface temperatures and pressures. Values of correlation coefficients +0.77 and +0.75 significant at <5 percent level. Also it is seen temperatures at 500 mb at mid-latitude and low-latitude were positively associated correlation coefficient value +0.8 significant at <5 percent level. Also zonal winds at high latitudes and (u) zonal winds at low latitudes are highly correlated at 500 mb and 100 mb levels (r -0.77, +0.65) significant at <5 percent level. Meridional wind components at 50 mb between high and mid latitudes are negatively correlated (-0.66).
From the above study it is observed mediterranean cyclone was associated with fall in pressure and rainfall at 0-12░N low- latitudes and reversal in meridional winds in lower stratosphere at high latitudes.