Background CO2 levels and error analysis from ground-based solar absorption IR measurements in central Mexico

被引：10

作者：

Baylon, Jorge L. ^{[1
]}

Stremme, Wolfgang ^{[1
]}

Grutter, Michel ^{[1
]}

Hase, Frank ^{[2
]}

Blumenstock, Thomas ^{[2
]}

机构：

[1] Univ Nacl Autonoma Mexico, Ctr Ciencias Atmosfera, Mexico City, DF, Mexico

[2] Karlsruhe Inst Technol, Inst Meteorol & Climate Res, Karlsruhe, Germany

来源：

ATMOSPHERIC MEASUREMENT TECHNIQUES | 2017年 / 10卷 / 07期

关键词：

CARBON; SURFACE; SPECTROMETER; RETRIEVAL; GASES;

D O I：

10.5194/amt-10-2425-2017

中图分类号：

P4 [大气科学（气象学）];

学科分类号：

0706 ; 070601 ;

摘要：

In this investigation we analyze two common optical configurations to retrieve CO2 total column amounts from solar absorption infrared spectra. The noise errors using either a KBr or a CaF2 beam splitter, a main component of a Fourier transform infrared spectrometer (FTIR), are quantified in order to assess the relative precisions of the measurements. The configuration using a CaF2 beam splitter, as deployed by the instruments which contribute to the Total Carbon Column Observing Network (TCCON), shows a slightly better precision. However, we show that the precisions in X CO2 (=0.2095.Total Column CO2/Total Column O-2) retrieved from > 96% of the spectra measured with a KBr beam splitter fall well below 0.2 %. A bias in X CO2 (KBr-CaF2) of +0.56 +/- 0.25 ppm was found when using an independent data set as reference. This value, which corresponds to +0.14 +/- 0.064 %, is slightly larger than the mean precisions obtained. A 3year X CO2 time series from FTIR measurements at the highaltitude site of Altzomoni in central Mexico presents clear annual and diurnal cycles, and a trend of +2.2 ppm yr(-1) could be determined.

引用

页码：2425 / 2434

页数：10

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