Lee Sanghee, Choi Gi-Hyuk, Lim Hyo-Suk, Lee Joo-Hee
Satellite Operation and Application Center, Korea Aerospace Research Institute, Yusung Daejeon, Korea.
Environ Monit Assess. 2004 Mar;92(1-3):35-42. doi: 10.1023/b:emas.0000014507.31728.48.
The Measurement of Pollution in the Troposphere (MOPITT) instrument is an eight-channel gas correlation radiometer, which was launched on the Earth Observing System (EOS) Terra satellite in 1999. Carbon monoxide (CO) is one of the important trace gases because its concentration in the troposphere directly influences the concentrations of tropospheric hydroxyl (OH), which controls the lifetimes of tropospheric trace gases. CO traces the transport of global and regional pollutants from industrial activities and large scale biomass burning. The global and regional distributions of CO were analyzed using the MOPITT data for East Asia, which were compared with the ozone distributions. In general, seasonal CO variations are characterized by a peak in the spring, which decrease in the summer. This work also revealed that the seasonal cycles for CO are at a maximum in the spring and a minimum in the summer, with average concentrations ranging from 118 to 170 ppbv. The monthly average for CO shows a similar profile to that for O3. This fact clearly indicates that the high concentration of CO in the spring is possibly due to one of two causes: the photochemical production of CO in the troposphere, or the transport of the CO into East Asia. The seasonal cycles for CO and O3 in East Asia are extensively influenced by the seasonal exchanges of different air mass types due to the Asian monsoon. The continental air masses contain high concentrations of O3 and CO, due to the higher continental background concentrations, and sometimes to the contribution from regional pollution. In summer this transport pattern is reversed, where the Pacific marine air masses that prevail over Korea bring low concentrations of CO and O3, which tend to give the apparent summer minimums.
对流层污染测量仪（MOPITT）是一台八通道气体相关辐射计，于1999年搭载在地球观测系统（EOS）的Terra卫星上发射升空。一氧化碳（CO）是重要的痕量气体之一，因为其在对流层中的浓度直接影响对流层羟基（OH）的浓度，而对流层羟基控制着对流层痕量气体的寿命。CO追踪来自工业活动和大规模生物质燃烧的全球及区域污染物的传输。利用东亚地区的MOPITT数据对CO的全球和区域分布进行了分析，并与臭氧分布进行了比较。一般来说，CO的季节性变化特征是春季出现峰值，夏季下降。这项研究还表明，CO的季节性周期在春季达到最大值，夏季达到最小值，平均浓度范围为118至170 ppbv。CO的月平均值显示出与O3相似的分布特征。这一事实清楚地表明，春季CO的高浓度可能是由于以下两个原因之一：对流层中CO的光化学产生，或者是CO传输到东亚地区。由于亚洲季风，东亚地区CO和O3的季节性周期受到不同气团类型季节性交换的广泛影响。大陆气团中O3和CO的浓度较高，这是由于较高的大陆背景浓度，有时也是由于区域污染的贡献。在夏季，这种传输模式发生逆转，韩国上空占主导的太平洋海洋气团带来低浓度的CO和O3，这往往导致明显的夏季最低值。
