沿22°～18°N航线上CO2对ENSO和La Nina的响应的季节变化

作者：马黎明  乔然

单位：国家海洋环境预报中心 北京

关键词：热带西太平洋西北部 ENSO La Nina CO2

分类号：P458

出版年·卷·期（页码）：2000·2000·第二期（1-11）

摘要：

根据1986年11月～1997年间月期间在114°～130°E,沿22°～18°N航线各航次所测量的大气和表层汽水中的CO2分压和总CO2浓度的变化,分析海气分压差(△PCO2)和溶解的总CO2浓度(TCO2)在不同季节对海气异常事件的响应。结果表明,无论春、夏、秋、冬,在ENSO暴发期和成熟期TCO2为高值,△PCO2为正值;在LaNina时TCO2为低值,△PCO2为负值;在ENSO暴发前、后,海-气C02分压呈近平衡状态;PCO2(air)和PCO2(sw)在各季节对ENSO的响应一致。在ENSO成熟期为高值,在ENSO暴发前和暴发期为低值;海气分压差与PCO2(SW)一致变化,在ENSO期间达最大值。海气CO2输送通量(Flux)以秋季ENSO期间达最大,而在LaNina时减小,在ENSO暴发前和结束后成为相反向,即从大气到海洋的CO2弱输送。本文根据1986年～93年七个航次的平均值讨论了各季节TCO2的距平对ENSO和LaNina的响应特征及最显著变化区段,并依此推断出:1995年10月,显示1991～95年ENSO结束,1996年5月出现ENSO暴发前的信号,在1997年...

Based on the variation of the partial pressure of CO2 in air (PCO2 (air)) and surfacewater (PCO2 (sw)) and the total dissoleved in warer (TCO2) measured during thecruises from Nov 1986 to Dec. 1997 along 22°N’ 114°~l8°N’ 130°E line, the responsesof the difference of PCO2 between sea and air (△PCO2) and to the anormol events ofair-sea system in spring, summef, fall and winter are indicated. The results indicatedthat in every season during the onset and mature of ENSO,△TCO2 is high value and APCoz is positive, but during La Nina that are low and negative respectively; Before and after ENSO the PCO2 (air) and PCO2(sw) are near balance. Both the responses of PCO2(air) and PCO2 (sw) are similar in different seasons: in mature of ENSO are high and before and in onset of ENSO are low; The mean exchange of from sea to air are maximum during ENSO in fall and low in La Nina. Before and after ENSO the flux is near zero or weak from air to sea water. Acoodong to the 1986~93 averagement the characteristics of response of the anomoly of TCO2 to ENSO and La Nina and the range of outsdandong variation in different season were discussed. From above it can be deduced that In oct1995. the 1991~95 ENSO is over; In May 1995 it is before a new ENSO; In july 1997it is in onset of new ENSO; In dec. 1997 it is in the mature of the ENSO event.

参考文献：

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