scholarly journals Technical Note: Functional sliced inverse regression to infer temperature, water vapour and ozone from IASI data

2009 ◽  
Vol 9 (14) ◽  
pp. 5321-5330 ◽  
Author(s):  
U. Amato ◽  
A. Antoniadis ◽  
I. De Feis ◽  
G. Masiello ◽  
M. Matricardi ◽  
...  
Keyword(s):  
Water Vapour ◽  
Technical Note ◽  
Retrieval Algorithm ◽  
Inverse Regression ◽  
Weather Forecasts ◽  
Time Profiles ◽  
Statistical Strategy ◽  
Atmospheric Sounding ◽  
Medium Range ◽  
Temperature Water

Abstract. A retrieval algorithm that uses a statistical strategy based on dimension reduction is proposed. The methodology and details of the implementation of the new algorithm are presented and discussed. The algorithm has been applied to high resolution spectra measured by the Infrared Atmospheric Sounding Interferometer instrument to retrieve atmospheric profiles of temperature, water vapour and ozone. The performance of the inversion strategy has been assessed by comparing the retrieved profiles to the ones obtained by co-locating in space and time profiles from the European Centre for Medium-Range Weather Forecasts analysis.

scholarly journals Technical note: Functional sliced inverse regression to infer temperature, water vapour and ozone from IASI data

2009 ◽  
Vol 9 (2) ◽  
pp. 7589-7613 ◽  
Author(s):  
U. Amato ◽  
A. Antoniadis ◽  
I. De Feis ◽  
G. Masiello ◽  
M. Matricardi ◽  
...  
Keyword(s):  
Water Vapour ◽  
Technical Note ◽  
Retrieval Algorithm ◽  
Inverse Regression ◽  
Weather Forecasts ◽  
Time Profiles ◽  
Statistical Strategy ◽  
Atmospheric Sounding ◽  
Medium Range ◽  
Temperature Water

Abstract. A retrieval algorithm that uses a statistical strategy based on dimension reduction is proposed. The methodology and details of the implementation of the new algorithm are presented and discussed. The algorithm has been applied to high resolution spectra measured by the Infrared Atmospheric Sounding Interferometer instrument to retrieve atmospheric profiles of temperature, water vapour and ozone. The performance of the inversion strategy has been assessed by comparing the retrieved profiles to the ones obtained by co-locating in space and time profiles from the European Centre for Medium-Range Weather Forecasts analysis.

scholarly journals Application of φ-IASI to IASI: retrieval products evaluation and radiative transfer consistency

2009 ◽  
Vol 9 (22) ◽  
pp. 8771-8783 ◽  
Author(s):  
G. Masiello ◽  
C. Serio ◽  
A. Carissimo ◽  
G. Grieco ◽  
M. Matricardi
Keyword(s):  
Water Vapour ◽  
Forward Model ◽  
Continuum Absorption ◽  
Weather Forecasts ◽  
Time Profiles ◽  
Spectral Residual ◽  
Atmospheric Sounding ◽  
Medium Range ◽  
Temperature Water

Abstract. Retrieval products for temperature, water vapour and ozone have been obtained from spectral radiances measured by the Infrared Atmospheric Sounding Interferometer flying onboard the first European Meteorological Operational satellite. These products have been used to check the consistency of the forward model and its accuracy and the expected retrieval performance. The study has been carried out using a research-oriented forward-inverse methodology, called φ-IASI, that the authors have specifically developed for the new sounding interferometer. The performance of the forward-inversion strategy has been assessed by comparing the retrieved profiles to profiles of temperature, water vapour and ozone obtained by co-locating in space and time profiles from radiosonde observations and from the European Centre for Medium-Range Weather Forecasts analysis. Spectral residuals have also been computed and analyzed to assess the quality of the forward model. Two versions of the high-resolution transmission molecular absorption database have been used, which mostly differ for ozone absorption line parameters, line and continuum absorption of both CO2 and H2O molecules. Their performance has been assessed by inter-comparing the results, and a consistent improvement in the spectral residual has been found when using the most updated release.

scholarly journals Application of φ-IASI to IASI: retrieval products evaluation and radiative transfer consistency

2009 ◽  
Vol 9 (2) ◽  
pp. 9647-9691 ◽  
Author(s):  
G. Masiello ◽  
C. Serio ◽  
A. Carissimo ◽  
G. Grieco ◽  
M. Matricardi
Keyword(s):  
Water Vapour ◽  
Forward Model ◽  
Retrieval Performance ◽  
Molecular Absorption ◽  
Weather Forecasts ◽  
Time Profiles ◽  
Atmospheric Sounding ◽  
Medium Range ◽  
Temperature Water

Abstract. Retrieval products for temperature, water vapour and ozone have been obtained from spectral radiances measured by the Infrared Atmospheric Sounding Interferometer flying onboard the first European Meteorological Operational satellite. These products have been used to check the consistency of the forward model and its accuracy and the expected retrieval performance. The study has been carried out using a research-oriented forward-inverse methodology, called φ-IASI, that the authors have specifically developed for the new sounding interferometer. The performance of the forward-inversion strategy has been assessed by comparing the retrieved profiles to profiles of temperature, water vapour and ozone obtained by co-locating in space and time profiles from radiosonde observations and from the European Centre for Medium-Range Weather Forecasts analysis. Spectral residuals have also been computed and analyzed to assess the quality of the forward model. Two versions of the high-resolution transmission molecular absorption database have been used. Their performance has been assessed by inter-comparing the results.

scholarly journals An “island” in the stratosphere – on the enhanced annual variation of water vapour in the middle and upper stratosphere in the southern tropics and subtropics

2017 ◽  
Vol 17 (18) ◽  
pp. 11521-11539 ◽  
Author(s):  
Stefan Lossow ◽  
Hella Garny ◽  
Patrick Jöckel
Keyword(s):  
Water Vapour ◽  
Atmospheric Chemistry ◽  
Annual Variation ◽  
Trace Gases ◽  
Michelson Interferometer ◽  
Full Account ◽  
Weather Forecasts ◽  
European Centre ◽  
Atmospheric Sounding ◽  
Medium Range

Abstract. The amplitude of the annual variation in water vapour exhibits a distinct isolated maximum in the middle and upper stratosphere in the southern tropics and subtropics, peaking typically around 15° S in latitude and close to 3 hPa (∼  40.5 km) in altitude. This enhanced annual variation is primarily related to the Brewer–Dobson circulation and hence also visible in other trace gases. So far this feature has not gained much attention in the literature and the present work aims to add more prominence. Using Envisat/MIPAS (Environmental Satellite/Michelson Interferometer for Passive Atmospheric Sounding) observations and ECHAM/MESSy (European Centre for Medium-Range Weather Forecasts Hamburg/Modular Earth Submodel System) Atmospheric Chemistry (EMAC) simulations we provide a dedicated illustration and a full account of the reasons for this enhanced annual variation.

scholarly journals An island in the stratosphere – On the enhanced annual variation of water vapour in the middle and upper stratosphere in the southern tropics and subtropics

2017 ◽  
Author(s):  
Stefan Lossow ◽  
Hella Garny ◽  
Patrick Jöckel
Keyword(s):  
Water Vapour ◽  
Atmospheric Chemistry ◽  
Annual Variation ◽  
Trace Gases ◽  
Michelson Interferometer ◽  
Full Account ◽  
Weather Forecasts ◽  
European Centre ◽  
Atmospheric Sounding ◽  
Medium Range

Abstract. The annual variation of water vapour exhibits a distinct isolated maximum in the middle and upper stratosphere in the southern tropics and subtropics, peaking typically around 15° S in latitude and close to 3 hPa (~ 40.5 km) in altitude. This enhanced annual variation is primarily related to the Brewer–Dobson circulation and hence also visible in other trace gases. So far this feature has not gained much attention in the literature and the present work aims to add more prominence. Using Envisat/MIPAS (Environmental Satellite/Michelson Interferometer for Passive Atmospheric Sounding) observations and ECHAM/MESSy (European Centre for Medium-Range Weather Forecasts Hamburg/Modular Earth Submodel System) Atmospheric Chemistry (EMAC) simulations we provide a dedicated illustration and a full account for the reasons of this enhanced annual variation.

scholarly journals Technical Note: An assessment of the accuracy of the RTTOV fast radiative transfer model using IASI data

2009 ◽  
Vol 9 (18) ◽  
pp. 6899-6913 ◽  
Author(s):  
M. Matricardi
Keyword(s):  
Radiative Transfer ◽  
Technical Note ◽  
Regression Coefficients ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
Weather Forecasts ◽  
Medium Range ◽  
Relative Differences ◽  
Temperature Water

Abstract. IASI measurements of spectral radiances made between the 1st April 2008 and the 15th April 2008 are compared with simulations performed using the RTTOV fast radiative transfer model utilizing regression coefficients based on different line-by-line models. The comparisons are performed within the framework of the European Centre for Medium-Range Weather Forecasts Integrated Forecast System using fields of temperature, water vapour and ozone obtained from short-range forecasts. Simulations are performed to assess the accuracy of the RTTOV computations and investigate relative differences between the line-by-line models and the quality of the spectroscopic databases on which the RTTOV coefficients are based.

scholarly journals An assessment of the accuracy of the RTTOV fast radiative transfer model using IASI data

2009 ◽  
Vol 9 (2) ◽  
pp. 9491-9535 ◽  
Author(s):  
M. Matricardi
Keyword(s):  
Radiative Transfer ◽  
Regression Coefficients ◽  
Radiative Transfer Model ◽  
Transfer Model ◽  
Weather Forecasts ◽  
Medium Range ◽  
Forecasting System ◽  
Relative Differences ◽  
Temperature Water

Abstract. IASI measurements of spectral radiances made between the 1 April 2008 and the 15 April 2008 are compared with simulations performed using the RTTOV fast radiative transfer model utilizing regression coefficients based on different line-by-line models. The comparisons are performed within the framework of the European Centre for Medium-Range Weather Forecasts Integrated Forecasting System using fields of temperature, water vapour and ozone obtained from short-range forecasts. Simulations are performed to assess the accuracy of the RTTOV computations and investigate relative differences between the line-by-line models and the quality of the spectroscopic databases on which the RTTOV coefficients are based.

scholarly journals Water vapour profiles from SCIAMACHY solar occultation measurements derived with an onion peeling approach

2010 ◽  
Vol 3 (2) ◽  
pp. 523-535 ◽  
Author(s):  
S. Noël ◽  
K. Bramstedt ◽  
A. Rozanov ◽  
H. Bovensmann ◽  
J. P. Burrows
Keyword(s):  
Water Vapour ◽  
Atmospheric Chemistry ◽  
Wavelength Region ◽  
Optical Absorption Spectroscopy ◽  
Density Profiles ◽  
Retrieval Method ◽  
Weather Forecasts ◽  
Solar Occultation ◽  
Medium Range ◽  
Scanning Imaging

Abstract. A new retrieval method has been developed to derive water vapour number density profiles from solar occultation measurements of the SCanning Imaging Absorption spectroMeter for Atmospheric CHartographY (SCIAMACHY). This method is intentionally kept simple and based on a combination of an onion peeling approach with a modified DOAS (Differential Optical Absorption Spectroscopy) fit in the wavelength region around 940 nm. Reasonable resulting water vapour profiles are currently obtained in the altitude range 15–45 km. Comparisons of the SCIAMACHY profiles with water vapour data provided by the Atmospheric Chemistry Explorer Fourier Transform Spectrometer (ACE-FTS) show an average agreement within about 5% between 20 and 45 km. SCIAMACHY water vapour data tend to be systematically higher than ACE-FTS. These results are in principal confirmed by comparisons with water vapour profiles derived from model data of the European Centre for Medium Range Weather Forecasts (ECMWF), although ECMWF concentrations are systematicly lower than both corresponding SCIAMACHY and ACE-FTS data at all altitudes.

scholarly journals The 2009 stratospheric major warming described from synergistic use of BASCOE water vapour analyses and MLS observations

2011 ◽  
Vol 11 (10) ◽  
pp. 4689-4703 ◽  
Author(s):  
W. A. Lahoz ◽  
Q. Errera ◽  
S. Viscardy ◽  
G. L. Manney
Keyword(s):  
Water Vapour ◽  
Meteorological Data ◽  
Polar Vortex ◽  
Stratospheric Polar Vortex ◽  
Weather Forecasts ◽  
Medium Range ◽  
Northern Winter ◽  
Dynamical Consistency ◽  
Stratospheric Water Vapour ◽  
Assimilation System

Abstract. The record-breaking major stratospheric warming of northern winter 2009 (January–February) is studied using BASCOE (Belgian Assimilation System for Chemical ObsErvation) stratospheric water vapour analyses and MLS (Microwave Limb Sounder) water vapour observations, together with meteorological data from the European Centre for Medium-Range Weather Forecasts (ECMWF) and potential vorticity (PV) derived from ECMWF meteorological data. We focus on the interaction between the cyclonic wintertime stratospheric polar vortex and subsidiary anticyclonic stratospheric circulations during the build-up, peak and aftermath of the major warming. We show dynamical consistency between the water vapour analysed fields and the meteorological and PV fields. Using various approaches, we use the analysed water vapour fields to estimate descent in the polar vortex during this period of between ~0.5 km day−1 and ~0.7 km day−1. New results include the analysis of water vapour during the major warming and demonstration of the benefit of assimilating MLS satellite data into the BASCOE model.

scholarly journals The 2009 stratospheric major warming described from synergistic use of BASCOE water vapour analyses and MLS observations

2010 ◽  
Vol 10 (10) ◽  
pp. 24699-24734
Author(s):  
W. A. Lahoz ◽  
Q. Errera ◽  
S. Viscardy ◽  
G. L. Manney
Keyword(s):  
Water Vapour ◽  
Meteorological Data ◽  
Polar Vortex ◽  
Stratospheric Polar Vortex ◽  
Weather Forecasts ◽  
Medium Range ◽  
Northern Winter ◽  
Dynamical Consistency ◽  
Stratospheric Water Vapour ◽  
Assimilation System

Abstract. The record–breaking major stratospheric warming of northern winter 2009 (January–February) is studied using BASCOE (Belgian Assimilation System for Chemical ObsErvation) stratospheric water vapour analyses and MLS (Microwave Limb Sounder) water vapour observations, together with meteorological data from the European Centre for Medium-Range Weather Forecasts (ECMWF) and potential vorticity derived from ECMWF meteorological data. We focus on the interaction between the cyclonic wintertime stratospheric polar vortex and subsidiary anticyclonic stratospheric circulations during the build-up, peak and aftermath of the major warming. We show dynamical consistency between the water vapour analysed fields, and the meteorological and PV fields. New results include the analysis of water vapour during the major warming and demonstration of the benefit of assimilating MLS satellite data into the BASCOE model.

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