We found a match
Your institution may have rights to this item. Sign in to continue.
- Title
Observations of XCO<sub>2</sub> and XCH<sub>4</sub> with ground-based high-resolution FTS at Saga, Japan and comparisons with GOSAT products.
- Authors
Ohyama, H.; Kawakami, S.; Tanaka, T.; Morino, I.; Uchino, O.; Inoue, M.; Sakai, T.; Nagai, T.; Yamazaki, A.; Uchiyama, A.; Fukamachi, T.; Sakashita, M.; Kawasaki, T.; Akaho, T.; Arai, K.; Okumura, H.
- Abstract
Solar absorption spectra in the near-infrared region have been continuously acquired with a ground-based (g-b) high-resolution Fourier transform spectrometer (FTS) at Saga, Japan since July 2011. Column-averaged dry-air mole fractions of greenhouse gases were retrieved from the measured spectra for the period from July 2011 to December 2014. Aircraft measurements of CO2 and CH4 for calibrating the g-b FTS data were performed in January 2012 and 2013, and it is found that the g-b FTS and aircraft data agree to within ±0.2 %. The column-averaged dry-air mole fractions of CO2 and CH4 (XCO2 and XCH4) show increasing trends, with average growth rates of 2.3 ppmyr-1 and 9.5 ppbyr-1, respectively, during the ∼ 3.5 yr of observation. We compared the g-b FTS XCO2 and XCH4 data with those derived from backscattered solar spectra in the short-wavelength infrared region measured with Thermal And Nearinfrared Sensor for carbon Observation-Fourier Transform Spectrometer (TANSO-FTS) onboard the Greenhouse gases Observing SATellite (GOSAT). Average differences between TANSO-FTS and g-b FTS data (TANSO-FTS minus g-b FTS) are 0.40-2.51 ppm and -7.6±13.7 ppb for XCO2 and XCH4, respectively. Using aerosol information measured with a sky radiometer at Saga, we found that the differences between the TANSO-FTS and g-b FTS data are moderately negatively correlated with aerosol optical thickness and do not depend explicitly on aerosol size. In addition, from aerosol profiles measured with lidar located right by the g-b FTS, we were able to show that cirrus clouds and tropospheric aerosols accumulated in the lower layers of the atmosphere tend to overestimate or underestimate the TANSO-FTS data.
- Subjects
GREENHOUSE gas analysis; ABSORPTION spectra; FOURIER transform spectroscopy; CLIMATE in greenhouses; GREENHOUSE effect; BACKSCATTERING
- Publication
Atmospheric Measurement Techniques Discussions, 2015, Vol 8, Issue 8, p8257
- ISSN
1867-8610
- Publication type
Article
- DOI
10.5194/amtd-8-8257-2015