Observations of tropospheric trace gases by ground-based high resolution FT-IR spectrometer

利用地面高分辨率傅立叶变换红外光谱仪观测对流层痕量气体

基本信息

批准号：
11680529
负责人：
TAKAHASHI Kenshi
金额：
$ 2.3万
依托单位：
Nagoya University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

Tropospheric column amounts and mixing ratios of carbon monoxide (CO), ethane (C_2H_6), acetylene (C_2H_2), and hydrogen cyanide (HCN) were retrieved from ground-based infrared solar spectra. The spectra were recorded with high spectral resolution Fourier Transform Infrared (FTIR) spectrometers at Moshiri (44.4°N) and Rikubetsu (43.5°N) in northern.The retrievals show significant seasonal variations in the tropospheric content of the four molecules over northern Japan with maxima in winter-spring (February-April) for CO, C_2H_6 and C_2H_2 and in summer (May-July) for HCN.Simultaneous enhancements of the tropospheric concentration of the four molecules were occasionally observed during the observational period, possibly due to the same sources. Good correlations among the tropospheric amounts of CO, C_2H_6, and C_2H_2 indicated that they had similar sources and underwent similar processes of dilution. Trajectory calculations and global fire maps revealed that emissions of biomass burning on the Asian continent were transported eastward to northern Japan. Decreasing trends in tropospheric CO, C_2H_6, and C_2H_2 from May 1995 to June 2000 were found to be (-2.10±0.30), (-2.53±0.30), and (-3.99±0.57)%yr, respectively, while the trend of (-0.93±0.49)%/yr in HCN was not significant. Since stratospheric O_3 absorbs the solar UV radiation, the depletion of global stratospheric O_3 since mid-1980s resulted in an increase of the solar UV radiation on the earth surface. It is appear that the observed negative trends in tropospheric CO, C_2H_6, and C_2H_2 over northern Japan should be due to the increase in the solar UV radiation through the photochemical reactions with OH.In addition, reduced emissions of these gases from biomass burning and anthropogenic sources in the past decade would be another reason for the decreasing trends in troposphericCO, C_2H_6, and C_2H_2 observed in northern Japan from May 1995 to June 2000.

从地面的红外太阳能光谱中检索了对流层柱量和一氧化碳（CO），乙烷（CO_2H_6），乙炔（C_2H_2）和氢氰化物（HCN）的混合比。记录光谱在Moshiri（44.4°N）和北部的Rikubetsu（44.4°N）的高光谱分辨率傅立叶变换红外（FTIR）光谱仪中记录。检索的检索显示了北部日本北部和Maxima的Throposposperic含量的季节性变化显着，在Winter-Sima中，winter-Sprabima and cobrial and-cobrial cobrial and-apaprial cobrial and-apprial cobrial-apprial co _-apprial cobrial coprial coprial and-apprial-apprial cobrial co _的季节性差异很大。 HCN的C_2H_2和夏季（5月至7月）的夏季。在观察期间有时会观察到这四个分子的对流层浓度的中等增强，这是由于相同的来源。 CO，C_2H_6和C_2H_2的对流层量之间的良好相关性表明它们具有相似的来源，并且经历了相似的稀释过程。轨迹计算和全球消防图显示，亚洲连续燃烧的生物质排放被向东运送到日本北部。发现从1995年5月到2000年6月对流层CO，C_2H_6和C_2H_2的趋势下降为（-2.10±0.30），（-2.53±0.30）和（-3.99±0.57）％yr，而（-3.99±0.57）％yr，而趋势（-0.93±0.49）％/yrn n n n n n in nncnnnnnnnnnnes hc不得多（-0.93±0.49）不多。由于平流层O_3吸收了太阳紫外线辐射，因此自1980年代中期以来，全球平流层O_3的深度导致地球表面上太阳能紫外线辐射的增加。 It is appear that the observed negative trends in tropospheric CO, C_2H_6, and C_2H_2 over northern Japan should be due to the increase in the solar UV radiation through the photochemical reactions with OH.In addition, reduced emissions of These gases from biomass burning and anthropogenic sources in the past decade would be another reason for the decreasing trends in troposphericCO, C_2H_6, and C_2H_2从1995年5月至2000年6月在日本北部观察到。