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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Formaldehyde measurements in the marine boundary layer of the Indian Ocean during the 1999 INDOEX cruise of the R/V Ronald H. Brown
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Formaldehyde measurements in the marine boundary layer of the Indian Ocean during the 1999 INDOEX cruise of the R/V Ronald H. Brown

机译：R / V罗纳德·布朗（Ronald H.Brown）的1999年INDOEX航行期间印度洋海洋边界层中的甲醛测量

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As part of the Indian Ocean Experiment (INDOEX), measurements of CH2O were carried out with a tunable diode laser absorption spectrometer on board the National Oceanic and Atmospheric Administration research vessel Ronald H. Brown during spring 1999. The average CH2O concentration measured in pristine southern hemispheric air over the Indian Ocean (IO) was 210 parts per trillion by volume (pptv). CH2O levels measured in the Northern Hemisphere show a strong dependence upon the air mass origin. North of the Intertropical Convergence Zone a mean concentration of 430 pptv was found in surface air over the IO. When the origin of the air masses did not change during the day and the air was not influenced by anthropogenic emissions, a clear diurnal cycle was observed with a minimum in the late morning and a maximum in the late afternoon. The amplitude of the mean diurnal pattern is around 150 pptv in the Southern Hemisphere and around 200 pptv in the Northern Hemisphere. In polluted air masses of the Northern Hemisphere, CH2O is positively correlated with CO. The ratio CH2O/CO is 3.2 X 10(-3) indicating well aged air with only a reduced amount of CH2O precursors left. To date, the reason for the observed correlation remains open to speculation. [References: 34]
机译：作为印度洋实验（INDOEX）的一部分，在1999年春季，国家海洋与大气管理局研究船Ronald H. Brown在船上使用可调二极管激光吸收光谱仪对CH2O进行了测量。在原始南部地区测量的平均CH2O浓度。印度洋（IO）上的半球空气的体积（pptv）为210万亿分之几。在北半球测得的CH2O含量高度依赖于空气质量的起源。在热带交汇带以北，IO上方的地表空气中平均浓度为430 pptv。当白天气团的源头没有变化，并且不受人为排放物的影响时，可以观察到一个清晰的昼夜周期，其早晨最低，下午最高。在南半球，日平均模式的振幅约为150 pptv，在北半球，约为200 pptv。在北半球受污染的空气中，CH2O与CO正相关。CH2O/ CO之比为3.2 X 10（-3），表明空气老化良好，只剩下少量CH2O前体。迄今为止，观察到的相关性的原因尚待推测。 [参考：34]

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