Free tropospheric CO, C2H6, and HCN above central Europe: Recent measurements from the Jungfraujoch station including the detection of elevated columns during 1998
Free tropospheric CO, C2H6, and HCN above central Europe: Recent measurements from the Jungfraujoch station including the detection of elevated columns during 1998
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中欧上空的自由对流层 CO、C2H6 和 HCN：少女峰站的最新测量结果，包括 1998 年期间检测到的高架柱
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
B. Buchmann
中科院分区：
文献类型：
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作者：
C. Rinsland;E. Mahieu;R. Zander;P. Demoulin;J. Forrer;B. Buchmann
对流层游离一氧化碳（CO）、乙烷（C2 H6）和氰化氢（HCN）柱丰度的时间序列是从瑞士阿尔卑斯山海拔3.58公里的少女峰国际科学站（ISSJ）（纬度46.55°N，经度7.98°E）的观测中得出的。假设自由对流层从3.58公里高度延伸到11公里高度，所有三种分子的相关列都是从1995年1月至1999年10月记录的高光谱分辨率红外太阳光谱中得出的。这三种分子表现出明显的季节性变化，CO和C2 H6在冬季最高，HCN在春季最高.这些季节变化叠加在年际变化上。1998年期间，这三种分子的对流层柱都有所升高。HCN的增加最为明显，全年数值都在增加，与其他年份的平均值相比，1998年1月增加了2倍。对流层柱的增加与1997-1998年强厄尔尼诺暖期期间广泛的野火相吻合。ISSJ上空的排放增强不太明显，在莫纳罗亚山（19.55°N，155.6°W）上空测量到的增加之后达到峰值。得出了1995年1月至1999年10月对流层CO、C2 H6和HCN的趋势值分别为（2.40 ± 0.49）、（0.47 ± 0.64）和（7.00 ± 1.61）% yr 1（1 sigma）.然而，如果1998年的测量被排除在拟合，CO和HCN的趋势，没有统计学意义上的，和一个统计学上显着减少的C2 H6对流层柱，推断。红外CO柱与CO在现场地面测量的比较表明，CO自由对流层垂直体积混合比廓线一般随海拔高度降低，全年。
Time series of free tropospheric carbon monoxide (CO), ethane (C 2 H 6 ), and hydrogen cyanide (HCN) column abundances have been derived from observations at the International Scientific Station of the Jungfraujoch (ISSJ) at 3.58-km altitude in the Swiss Alps (latitude 46.55°N, 7.98°E longitude). The free troposphere was assumed to extend from 3.58 to 11 km altitude, and the related columns were derived for all three molecules from high spectral resolution infrared solar spectra recorded between January 1995 and October 1999. The three molecules show distinct seasonal cycles with maxima during winter for CO and C 2 H 6 , and during spring for HCN. These seasonal changes are superimposed on interannual variations. The tropospheric columns of all three molecules were elevated during 1998. Increases were most pronounced for HCN with enhanced values throughout the year, up to a factor of 2 in January 1998 when compared to averages of the other years. The increased tropospheric columns coincide with the period of widespread wildfires during the strong El Nino warm phase of 1997-1998. The emission enhancements above ISSJ are less pronounced, and they peaked after the increases measured above Mauna Loa (19.55°N, 155.6°W). Tropospheric trends for CO, C 2 H 6 , and HCN of (2.40 ± 0.49), (0.47 ± 0.64), and (7.00 ± 1.61)% yr 1 (1 sigma) were derived for January 1995 to October 1999. However, if 1998 measurements are excluded from the fit, CO and HCN trends that are not statistically significant, and a statistically significant decrease in the C 2 H 6 tropospheric column, are inferred. Comparisons of the infrared CO columns with CO in situ surface measurements suggest that the CO free tropospheric vertical volume mixing ratio profile generally decreases with altitude throughout the year.