科研之友
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摘要
Ozone amount in the 6-km layer near the tropopause and the spatial-temporal distribution of heating rate are calculated, using the 44-yr (1958 similar to 2001) data set provided by ECMWF and parameterization. The results show that: (1) the spatial gradient of ozone content distribution is from equatorial to polar areas. while the spatial gradient of the heating rate distribution is from the high-latitude and low-latitude to the subtropical areas. It is likely that such meridional gradient is an important factor which drives the tropopause structure variations. The seasonal variation about the spatial distributions of ozone amount and heating rate is obvious while they are not fully consistent with each other. The spatial structure in January and April is reverse with that in July and October and abrupt change exists along with season varying. The seasonal change is relatively unobvious in East Asia and Tibetan plateau. (2) The heating rate and ozone amount shows positive correlation in the areas controlled by tropopause in tropics. and this relationship varies with seasons in the areas controlled by polar tropopause. Also this relationship has something to do with the declination; the phase and amplitude of seasonal heating rate variation differ among different latitude areas. while it is more consistent in Southern Hemisphere, and the seasonal variation is also more even 9 the largest anomaly is +/- 2 X 10(-4) K center dot d(-1). And the largest anomaly is +/- 4 X 10(-4) K center dot d(-1) in the Northern Hemisphere. The seasonal phases are generally reverse in two Hemispheres. (3) The seasonal variation of ozone amount anomaly exceeds that of heating rate anomaly 2-3 months in the period of season adjustment, except in the tropical areas; The largest anomaly is greater than 0. 4DU in August in Antarctic, it is smaller than -0. 2DU in March and April. and it is +/- 0. 2 DU in Arctic. (4) The interannual and interdecadal change of ozone amount and heating rate are correspondent. both show multi-scale characteristics. The differences of variation between two Hemispheres and equatorial areas are obvious. The amplitude of heating rate in the areas between 30 degrees S similar to 30 degrees N is rather larger and the largest anomaly is +/- 2. 5X 10(-4) K center dot d(-1). the amplitude in higher and polar latitude is different in different periods; while the amplitude of ozone amount shows reverse characteristics. The largest anomaly is greater than 0. 25 or smaller than -0. 35 in Arctic areas. (5))There are opposite anomaly structures In two Hemispheres before 70's and mid-70's in 20th century, while the most remarkable period of the minus anomaly is in 90's.
- 出版日期2008-9
- 单位中国民用航空飞行学院; 云南大学
