Measurement of stratospheric water vapor by cryogenic collection
Measurement of stratospheric water vapor by cryogenic collection
复制标题
通过低温收集测量平流层水蒸气
DOI：
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发表时间：
1980
期刊：
影响因子：
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通讯作者：
D. Ehhalt
中科院分区：
文献类型：
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作者：
W. Pollock;L. Heidt;R. Lueb;D. Ehhalt
对水蒸气的低温收集及其随后在实验室中的重量或体积测量已被用于测量对流层水蒸气浓度，最近还用于测量平流层水蒸气浓度。还测量了水样中的氘和氚含量。同位素测量不仅提供了关于采样期间污染的额外信息，而且还提供了关于水蒸气的来源或以前的历史的信息。平流层H2O剖面随海拔高度的升高而增大，在30°N附近较陡，而H2O、CH4和H2的总和则没有明显的垂直梯度，因此，H2O的增大主要是由于CH4混合比的垂直降低所致。对阿拉斯加上空一次飞行的同位素测量也表明了这一点。
Cryogenic collection of water vapor and its subsequent gravimetric or volumetric measurement in the laboratory has been used to measure tropospheric and more recently also stratospheric water vapor concentrations. Also measured were the Deuterium and Tritium content of the water samples. The isotopic measurements provide not only additional information on contamination during sampling, but also on the origin or previous history of the water vapor. The stratospheric H 2 O profiles show an increase with altitude which is weak for the high latitudes and steeper around 30°N. Profiles of total hydrogen, the sum of H 2 O, CH 4 , and H 2 , show no significant vertical gradients; therefore, the H 2 O increase is essentially caused by the vertical decrease in CH 4 mixing ratio. Isotope measurements for one flight over Alaska indicate the same.