The impact of local winds and long-range transport on the continuous carbon dioxide record at Mount Waliguan, China
The impact of local winds and long-range transport on the continuous carbon dioxide record at Mount Waliguan, China
复制标题
DOI：
10.3402/tellusb.v55i2.16754
复制
发表时间：
2003-01
期刊：
影响因子：
--
通讯作者：
Ling-xi Zhou;Jie Tang;Y. Wen;Jinlong Li;P. Yan;Xiao-chun Zhang
中科院分区：
文献类型：
--
作者：
Ling-xi Zhou;Jie Tang;Y. Wen;Jinlong Li;P. Yan;Xiao-chun Zhang
本文介绍了1994-2000年中国西部瓦里关山（36°17′N, 100°54′E, 3816 m asl）大气二氧化碳的连续观测资料。CO2每小时混合比分别按水平风向/风速和垂直风向分离，在整个测量期间按季节合并。主要从该站观测到的局地风和对局地和远距离运输影响的等压回轨迹聚类浓度分析的角度来考察CO2的短期变率，以便选择代表背景条件的每小时平均数据。从所选的每小时数据中，通过区分对瓦里关CO2记录的当地和区域影响，计算不受当地CO2源和汇影响的日、月和年平均值。在此基础上，对CO2背景数据进行分析，评价CO2的平均日变化、月平均时间序列、不同季节的CO2混合比分布以及平均季节周期。通过补充瓦利关站和北半球类似纬向带其他监测站的NOAA/CMDL烧瓶空气采样记录，进一步讨论了瓦利关站1991 - 2000年的CO2年平均值和年增长率。本研究结果可提供亚洲内陆地区大气CO2特征，并可用于其他研究，以提高对碳源和碳汇分布的认识。
This paper describes the continuous measurements of atmospheric carbon dioxide at Mt. Waliguan (36°17ʹN, 100°54ʹE, 3816 m asl) in western China over the period 1994–2000. The CO2 hourly mixing ratios were segregated by horizontal wind direction/speed and vertical winds, respectively, merged by season over the entire measurement period. The short-term variability in CO2 was examined mainly from the point of view of local winds observed at this station and isobaric back trajectory cluster-concentration analysis as for local and long-range transport influence, to permit the selection of hourly average data that is representative of background conditions. From the selected hourly data, daily, monthly and annual averages that are not influenced by local CO2 sources and sinks be computed by discriminating the local and regional impact on the Waliguan CO2 records. On the basis of these results, background CO2 data were then analyzed to evaluate the averaged diurnal variation, monthly mean time series, CO2 mixing ratio distribution in different seasons as well as averaged seasonal cycle. Annual mean and growth rate of CO2 at Waliguan during the period of 1991 to 2000 were further discussed by supplement with NOAA/CMDL flask air sampling records at this station and other monitoring stations located at similar latitudinal band in the Northern Hemisphere. The results from this study can provide atmospheric CO2 characteristics in Asian inland regions, and be used in other studies to improve the understanding of carbon source and sink distributions.