Latitudinal trends in O 3 , CO, CH 4 and SF 6 over the Indian Ocean during the INDOEX IFP-1999 ship cruise
Latitudinal trends in O 3 , CO, CH 4 and SF 6 over the Indian Ocean during the INDOEX IFP-1999 ship cruise
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INDOEX IFP-1999 船舶巡航期间印度洋上空 O 3 、CO、CH 4 和 SF 6 的纬度趋势
DOI：
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发表时间：
2001
期刊：
影响因子：
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通讯作者：
S. Lal
中科院分区：
文献类型：
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作者：
D. Chand;K. S. Modh;M. Naja;S. Venkataramani;S. Lal
1999年1-3月在北纬17°-20°S范围内对阿拉伯海和印度洋进行了臭氧(O3)、一氧化碳(CO)、甲烷(CH4)和六氟化硫(SF6)的地面测量。观测结果表明，这些痕量气体从印度洋沿海地区到开阔的印度洋都有减少的趋势。臭氧的寿命为几天，是这里介绍的物种中最短的，它的变化很大，而寿命相对较长的SF6的变化较小。臭氧也清楚地显示了ITCZ及其运动的影响。这些观测显示，1999年1月印度沿海地区附近的臭氧高于1999年3月，也高于1998年INDOEX-1998巡航期间观测到的臭氧。据信，这是由于1999年1月强烈的反气旋条件，从印度大陆带来了更多受污染的空气。与1998年相比，1999年同地区CH4的纬度梯度减小，表明1998-1999年的增长速度较慢。
Surface measurements of ozone (O 3 ), carbon monoxide (CO), methane (CH 4 ) and sulfur hexafluoride (SF 6 ) were made over the Arabian Sea and the Indian Ocean during the INDOEX field experiment in January- March 1999 covering the latitude range from 17°N to 20°S. Observations show decreasing trends in all these trace gases from the Indian coastal region to the open Indian Ocean. Ozone with a lifetime of few days, shortest among the species presented here, shows large variations while SF 6 , which has relatively longer lifetime, shows smaller variations. Ozone also shows clearly the effect of ITCZ and its movement. These observations show higher ozone near the Indian coastal region in January 1999 than in March 1999 and also compared to the observed ozone during the INDOEX-1998 cruise. This is believed to be due to strong anti-cyclonic conditions in January 1999 bringing more polluted air from the Indian continent. A decrease in the latitudinal gradient in CH 4 was observed in 1999 compared to that in 1998 in the same region, indicating slower growth rate in 1998-1999 period.