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author = "Velazco, V."

Found 25 documents, displaying page 2 of 3

Seasonal and latitudinal variation of atmospheric methane: a ground-based and ship-borne solar IR spectroscopic study

Description : Column-averaged volume mixing ratios of CH4 were retrieved with a precision of better than 0.5% from infrared solar absorption spectra obtained at Ny-Alesund (Spitsbergen, 79 N) between 1997 and 2004 and during two ship cruises (54 N–34 S) on the Atlantic in 2003. The retrieval has been performed in...
Repository : Igitur Archive, Utrecht University repository
Language(s) : English

Annual variation of strato-mesospheric carbon monoxide measured by ground-based Fourier transform infrared spectrometry

Description : We present long-term time-series of strato-mesospheric CO vertical columns measured from stations located in Antarctica, mid-latitudes and the Arctic, covering the period from 1997?2005. The instrument and the measurement technique allows the separation of tropospheric and strato-mesospheric contrib...
Repository : HAL - Hyper Article on Line
Language(s) : English

Annual variation and global distribution of strato-mesospheric carbon monoxide measured by ground-based Fourier Transform Infrared spectrometry

Description : We present long-term time-series of strato-mesospheric CO vertical columns measured from stations located in Antarctica, mid-latitudes and the Arctic, covering the period from 1997?2005. The instrument and the measurement technique allows the separation of tropospheric and strato-mesospheric contrib...
Repository : HAL - Hyper Article on Line
Language(s) : English

Method for evaluating trends in greenhouse gases from ground-based remote FTIR measurements over Europe

Description : This paper describes the statistical analysis of annual trends in long term datasets of greenhouse gas measurements taken over ten or more years. The analysis technique employs a bootstrap resampling method to determine both the long-term and intra-annual variability of the datasets, together with t...
Repository : HAL - Hyper Article on Line
Language(s) : English

Evaluation of tropospheric and stratospheric ozone trends over Western Europe from ground-based FTIR network observations

Description : Within the European project UFTIR (Time series of Upper Free Troposphere observations from an European ground-based FTIR network), six ground-based stations in Western Europe, from 79° N to 28° N, all equipped with Fourier Transform infrared (FTIR) instruments and part of the Network for the Detecti...
Repository : HAL - Hyper Article on Line
Language(s) : English

Ground-based FTIR measurements of O3- and climate-related gases in the free troposphere and lower stratosphere

Description : In the frame of the EC project UFTIR (Time series of Upper Free Troposphere observations from a European ground-based FTIR network), a common strategy for an optimal determination of the chemical composition in the free troposphere and lower stratosphere with ground-based Fourier-transform infrared ...
Repository : ORBi (University of Liège)
Language(s) : English

Increased Northern Hemispheric carbon monoxide burden in the troposphere in 2002 and 2003 detected from the ground and from space

Description : Carbon monoxide total column amounts in the atmosphere have been measured in the High Northern Hemisphere (30°-90° N, HNH) between January 2002 and December 2003 using infrared spectrometers of high and moderate resolution and the Sun as a light source. They were compared to ground-level CO mixing r...
Repository : HAL - Hyper Article on Line
Language(s) : English

Increased Northern Hemispheric carbon monoxide burden in the troposphere in 2002 and 2003 detected from the ground and from space

Description : Carbon monoxide total column amounts in the atmosphere have been measured in the High Northern Hemisphere (30°?90° N, HNH) between January 2002 and December 2003, based on the analysis of infrared solar spectra recorded with spectrometers of high and moderate resolution. They are compared to ground-...
Repository : HAL - Hyper Article on Line
Language(s) : English

Found 25 documents, displaying page 2 of 3