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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >LARGE-SCALE DISTRIBUTIONS OF TROPOSPHERIC NITRIC, FORMIC, AND ACETIC ACIDS OVER THE WESTERN PACIFIC BASIN DURING WINTERTIME
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LARGE-SCALE DISTRIBUTIONS OF TROPOSPHERIC NITRIC, FORMIC, AND ACETIC ACIDS OVER THE WESTERN PACIFIC BASIN DURING WINTERTIME

机译：冬季西太平洋盆地对流层硝酸，甲酸和乙酸的大型分布

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摘要

We report here measurements of the acidic gases nitric (HNO3), formic (HCOOH), and acetic (CH3COOH) over the western Pacific basin during the February-March 1994 Pacific Exploratory Mission-West (PEM-West B). These data were obtained aboard the NASA DC-8 research aircraft as it flew missions in the altitude range of 0.3 - 12.5 km over equatorial regions near Guam and then further westward encompassing the entire Pacific Rim are. Aged marine air over the equatorial Pacific generally exhibited mixing ratios of acidic gases <100 parts per trillion by volume (pptv). Near the Asian continent, discrete plumes encountered below 6 km altitude contained up to 8 parts per billion by volume (ppbv) HNO3 and 10 ppbv HCOOH and CH3COOH. Overall there was a general correlation between mixing ratios of acidic gases with those of CO, C2H2, and C2Cl4, indicative of emissions from combustion and industrial sources. The latitudinal distributions of HNO3 and CO showed that the largest mixing ratios were centered around 15 degrees N, while HCOOH, CH3COOH, and C2Cl4 peaked at 25 degrees N. The mixing ratios of HCOOH and CH3COOH were highly correlated (r(2)=0.87) below 6 km altitude, with a slope (0.89) characteristic of the nongrowing season at midlatitudes in the northern hemisphere. Above 6 km altitude, HCOOH and CH3COOH were marginally correlated (r(2)=0.50), and plumes well defined by CO, C2H2, and C2Cl4 were depleted in acidic gases, most likely due to scavenging during vertical transport of air masses through convective cloud systems over the Asian continent. Zn stratospheric air masses, HNO3 mixing ratios were several parts per billion by volume (ppbv), yielding relationships with O-3 and N2O consistent with those previously reported for NOy. [References: 31]
机译：我们在此报告1994年2月至3月西太平洋勘探任务（PEM-West B）上西太平洋盆地上的酸性气体硝酸（HNO3），甲酸（HCOOH）和乙酸（CH3COOH）的测量值。这些数据是在NASA DC-8研究飞机上执行的，当时该飞机在关岛附近的赤道地区飞行0.3-12.5 km的海拔范围内，然后向西飞行，包围了整个环太平洋地区。赤道太平洋上的老化海洋空气通常表现出的酸性气体的混合比<100份/万亿体积（pptv）。在亚洲大陆附近，海拔6公里以下遇到的离散羽流中，HNO3的体积（ppbv）高达十亿分之八（ppbv），HCOOH和CH3COOH的体积高达10 ppbv。总体而言，酸性气体与CO，C2H2和C2Cl4的混合比之间存在总体相关性，表明燃烧和工业来源的排放。 HNO3和CO的经度分布表明，最大混合比集中在15°N附近，而HCOOH，CH3COOH和C2Cl4则在25°N达到峰值.HCOOH和CH3COOH的混合比高度相关（r（2）= 0.87 ）高度低于6公里，北半球中纬度非生长季节的坡度（0.89）。在6 km以上的高度上，HCOOH和CH3COOH的相关性很小（r（2）= 0.50），由CO，C2H2和C2Cl4定义的羽流中的酸性气体被消耗掉了，这很可能是由于空气在垂直方向上通过对流对流过程中的清除作用所致。亚洲大陆上的云系统。锌平流层空气质量，HNO3混合比为十亿分之几（ppbv），与O-3和N2O的关系与先前报道的NOy一致。 [参考：31]

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