Characterisation of methane variability and trends from near-infrared solar spectra over Hefei, China
Characterisation of methane variability and trends from near-infrared solar spectra over Hefei, China
复制标题
中国合肥近红外太阳光谱的甲烷变化特征和趋势
DOI：
10.1016/j.atmosenv.2017.11.001
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发表时间：
2018
影响因子：
5
通讯作者：
Hu Qihou
中科院分区：
文献类型：
--
作者：
Tian Yuan;Sun Youwen;Liu Cheng;Wang Wei;Shan Changgong;Xu Xingwei;Hu Qihou
利用地面高分辨率傅立叶变换光谱仪（FTS）记录的近红外（NIR）太阳光谱，研究了中国合肥地区的xch4（平均柱干空气摩尔分数）的变化特征和趋势。从三年的FTS测量值推断，ch4浓度每年增加10.55±2.87 ppb yr - 1（0.56±0.15% yr - 1）。捕获了季节周期和3种典型的日变化模式。ch4浓度最大值出现在夏末秋初，最小值出现在冬季。8月ch4浓度较1月高30 ~ 55 ppb。在大多数情况下，夏季和初秋的日变率呈增加趋势，其他季节的日变率呈下降趋势或保持相对稳定。我们将FTS数据与GOSAT数据和GEOS-Chem模型数据进行了比较。GOSAT数据与FTS数据（GOSAT减去FTS）的平均差异为1.60 ppb（0.09%）±13.0 ppb(0.70%)，平滑的GEOS-Chem模型数据与FTS数据（GEOS-Chem减去FTS）的平均差异为- 8.09 ppb（0.45%）±17.83 ppb（0.95%）。GOSAT和FTS的差异不受季节影响；然而，GEOS-Chem和FTS之间存在明显的季节依赖性差异。GOSAT和GEOS-Chem模型能够再现FTS观测到的季节周期，相关系数(r)分别为0.77和0.86。
This study presents the characterization ofXCH4(averaged-column dry air mole fraction) variability and trends using the near-infrared (NIR) solar spectra recorded by the ground-based high-resolution Fourier transform spectrometer (FTS) over Hefei, China. An annual increase of 10.55 ± 2.87 ppb yr−1(0.56 ± 0.15% yr−1) in CH4concentrations was deduced from the three years’ worth of FTS measurements. Seasonal cycles and three typical diurnal variation modes were captured. The maximum CH4concentration occurred in late summer or early autumn, while the minimum CH4concentration occurred in winter. CH4concentrations in August were 30–55 ppb higher than those in January. In most cases, the diurnal variability exhibited an increasing trend in summer or early autumn, while it exhibited a decreasing trend or remained relatively constant in other seasons. We compared the FTS data with the GOSAT data and the GEOS-Chem model data. The average difference between the GOSAT and FTS data (GOSAT minus FTS) was 1.60 ppb (0.09%) ±13.0 ppb (0.70%), and between the smoothed GEOS-Chem model data and FTS data (GEOS-Chem minus FTS) was −8.09 ppb (0.45%) ±17.83 ppb (0.95%). The differences between GOSAT and FTS were season-independent; however, obvious season-dependent differences were observed between GEOS-Chem and FTS. The GOSAT and GEOS-Chem models could reproduce the seasonal cycle observed by FTS with correlation coefficients (r) of 0.77 and 0.86, respectively.
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影响因子：
4.4
作者：
FUNG, I;JOHN, J;FRASER, PJ
通讯作者：
FRASER, PJ
影响因子：
3.8
作者：
D. Wunch;G. Toon;P. Wennberg;S. Wofsy;B. Stephens;M. Fischer;O. Uchino;J. Abshire;P. Bernath;S. Biraud;J. Blavier;C. Boone;K. Bowman;E. Browell;T. Campos;B. Connor;B. Daube;N. Deutscher;M. Diao;J. Elkins;C. Gerbig;E. Gottlieb;D. Griffith;D. Hurst;R. Jiménez;G. Keppel‐Aleks;E. Kort;R. Macatangay;T. Machida;H. Matsueda;F. Moore;I. Morino;Sunyoung Park;John Robinson;C. Roehl;Y. Sawa;V. Sherlock;C. Sweeney;Tomoak Tanaka;M. Zondlo
通讯作者：
D. Wunch;G. Toon;P. Wennberg;S. Wofsy;B. Stephens;M. Fischer;O. Uchino;J. Abshire;P. Bernath;S. Biraud;J. Blavier;C. Boone;K. Bowman;E. Browell;T. Campos;B. Connor;B. Daube;N. Deutscher;M. Diao;J. Elkins;C. Gerbig;E. Gottlieb;D. Griffith;D. Hurst;R. Jiménez;G. Keppel‐Aleks;E. Kort;R. Macatangay;T. Machida;H. Matsueda;F. Moore;I. Morino;Sunyoung Park;John Robinson;C. Roehl;Y. Sawa;V. Sherlock;C. Sweeney;Tomoak Tanaka;M. Zondlo
DOI：
10.14291/tccon.ggg2014.documentation.r0/1221662
发表时间：
2015-10
影响因子：
3.8
作者：
J. Placeholder
通讯作者：
J. Placeholder
影响因子：
3.8
作者：
Morino, I.;Uchino, O.;Rettinger, M.
通讯作者：
Rettinger, M.
影响因子：
6.3
作者：
Whitney Bader;B. Bovy;S. Conway;K. Strong;D. Smale;A. Turner;T. Blumenstock;C. Boone;M. Coen;A. Coulon;O. García;D. Griffith;F. Hase;P. Hausmann;N. Jones;P. Krummel;I. Murata;I. Morino;H. Nakajima;S. O'Doherty;C. Paton‐Walsh;John Robinson;Rodrigue Sandrin;M. Schneider;C. Servais;R. Sussmann;E. Mahieu
通讯作者：
Whitney Bader;B. Bovy;S. Conway;K. Strong;D. Smale;A. Turner;T. Blumenstock;C. Boone;M. Coen;A. Coulon;O. García;D. Griffith;F. Hase;P. Hausmann;N. Jones;P. Krummel;I. Murata;I. Morino;H. Nakajima;S. O'Doherty;C. Paton‐Walsh;John Robinson;Rodrigue Sandrin;M. Schneider;C. Servais;R. Sussmann;E. Mahieu