摘要:利用ERA-interim月平均再分析资料、相关分析和信息流方法，分析了1979~2015年夏半年（5~9月）100 hPa上南亚高压与邻近地区臭氧变化的相互作用。结果表明：除7月外，夏半年南亚高压与南亚高压区臭氧低值（简称臭氧低值）存在相互作用。6月和9月南亚高压和臭氧低值强度变化相互影响，而在5月和8月二者的作用仅仅是单向的。在6月南亚高压和臭氧低值的中部和西部边缘，以及9月南亚高压北部和臭氧低值中心区，臭氧低值增强（减弱）可能是南亚高压增强（减弱）的部分原因，南亚高压增强（减弱）也可能是臭氧低值增强（减弱）的部分原因。在6月南亚高压和臭氧低值的东南部、8月南亚高压和臭氧低值的西部和东部，以及9月南亚高压的西部，南亚高压增强（减弱）可能导致臭氧低值增强（减弱）。在5月南亚高压西部和臭氧低值南部，臭氧低值的增强（减弱）可能导致了南亚高压的增强（减弱）。根据相关分析，推测臭氧变化对南亚高压变化的可能影响机制如下：当南亚高压区臭氧浓度出现正异常时，辐射加热在其上部（下部）为负异常（正异常），导致高层（低层）异常辐合（辐散），从而导致下沉异常。高层异常辐合与下沉异常最终使南亚高压异常减弱。而臭氧浓度负异常导致南亚高压呈现正异常的过程与上述过程相反。
关键词:南亚高压/
臭氧低值/
相互作用/
机制
Abstract:The interaction between variations of South Asia High (SAH) and ozone in the adjacent regions during the summer half year (May-September) from 1979 to 2015 are studied by using ERA-Interim monthly data and the methods of correlation analysis and information flow. The results show that there are interactions between the SAH and ozone low in the region of SAH (hereinafter referred to as ozone low) during the summer half year except in July. The causal relations between the intensity of SAH and ozone low are interactive in June and September while the relationship becomes one-way causality in May and August. There may be an interaction between the enhancement (weakening) of ozone low and the enhancement (weakening) of SAH in the central and western edge of SAH and ozone low area in June, and in the northern SAH and the central area of ozone low in September. And the enhancement (weakening) of SAH may partly influence the enhancement (weakening) of ozone low in the southeastern SAH in June, in the western and eastern SAH in August and in the western SAH in September. In May, the enhancement (weakening) of ozone low may contribute to the enhancement (weakening) of SAH in the western SAH and the southern ozone low area. The possible mechanism of the impact of ozone low on SAH is investigated by correlation analysis, and the results are as follow. When positive ozone concentration anomalies occur in the region of SAH, there will have negative (positive) anomaly of radiation heating above (below) the region, which leads to abnormal convergence (divergence) in the higher (lower) levels and thus causes an abnormal descending motion. The anomaly of convergence in the higher levels and negative anomaly of vertical velocity lead to negative anomaly of SAH intensity. The process that involves in the formation of positive anomaly of SAH intensity induced by negative ozone anomaly is opposite to the process mentioned above.
Key words:South Asia high/
Ozone low/
Interaction/
Mechanism
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