A 60-year reconstructed high-resolution local meteorological data set in Central Sahel (1950-2009): Evaluation, analysis and application to land surface modelling
The Sahel has experienced strong climate variability in the past decades. Understanding its implications for natural and cultivated ecosystems is pivotal in a context of high population growth and mainly agriculture-based livelihoods. However, efforts to model processes at the land–atmosphere interface are hindered, particularly when the multi-decadal timescale is targeted, as climatic data are scarce, largely incomplete and often unreliable. This study presents the generation of a long-term, high-temporal resolution, multivariate local climatic data set for Niamey, Central Sahel. The continuous series spans the period 1950–2009 at a 30-min timescale and includes ground station-based meteorological variables (precipitation, air temperature, relative and specific humidity, air pressure, wind speed, downwelling long- and short-wave radiation) as well as process-modelled surface fluxes (upwelling long- and short-wave radiation, latent, sensible and soil heat fluxes and surface temperature). A combination of complementary techniques (linear/spline regressions, a multivariate analogue method, artificial neural networks and recursive gap filling) was used to reconstruct missing meteorological data. The complete surface energy budget was then obtained for two dominant land cover types, fallow bush and millet, by applying the meteorological forcing data set to a finely field-calibrated land surface model. Uncertainty in reconstructed data was expressed by means of a stochastic ensemble of plausible historical time series. Climatological statistics were computed at sub-daily to decadal timescales and compared with local, regional and global data sets such as CRU and ERA-Interim. The reconstructed precipitation statistics, ∼1 °C increase in mean annual temperature from 1950 to 2009, and mean diurnal and annual cycles for all variables were in good agreement with previous studies. The new data set, denoted NAD (Niamey Airport-derived set) and publicly available, can be used to investigate the water and energy cycles in Central Sahel, while the methodology can be applied to reconstruct series at other stations.
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dig-cirad-fr-5831272022-03-30T11:54:22Z http://agritrop.cirad.fr/583127/ http://agritrop.cirad.fr/583127/ A 60-year reconstructed high-resolution local meteorological data set in Central Sahel (1950-2009): Evaluation, analysis and application to land surface modelling. Leauthaud Crystèle, Cappelaere Bernard, Demarty Jérôme, Guichard Laurence, Velluet C., Kergoat Laurent, Vischel T., Grippa Manuela, Mouhaimouni M., Bouzou Moussa Ibrahim, Mainassara I., Sultan B.. 2017. International Journal of Climatology, 37 (5) : 2699-2718.https://doi.org/10.1002/joc.4874 <https://doi.org/10.1002/joc.4874> Researchers A 60-year reconstructed high-resolution local meteorological data set in Central Sahel (1950-2009): Evaluation, analysis and application to land surface modelling Leauthaud, Crystèle Cappelaere, Bernard Demarty, Jérôme Guichard, Laurence Velluet, C. Kergoat, Laurent Vischel, T. Grippa, Manuela Mouhaimouni, M. Bouzou Moussa, Ibrahim Mainassara, I. Sultan, B. eng 2017 International Journal of Climatology P40 - Météorologie et climatologie Sahel http://aims.fao.org/aos/agrovoc/c_6734 The Sahel has experienced strong climate variability in the past decades. Understanding its implications for natural and cultivated ecosystems is pivotal in a context of high population growth and mainly agriculture-based livelihoods. However, efforts to model processes at the land–atmosphere interface are hindered, particularly when the multi-decadal timescale is targeted, as climatic data are scarce, largely incomplete and often unreliable. This study presents the generation of a long-term, high-temporal resolution, multivariate local climatic data set for Niamey, Central Sahel. The continuous series spans the period 1950–2009 at a 30-min timescale and includes ground station-based meteorological variables (precipitation, air temperature, relative and specific humidity, air pressure, wind speed, downwelling long- and short-wave radiation) as well as process-modelled surface fluxes (upwelling long- and short-wave radiation, latent, sensible and soil heat fluxes and surface temperature). A combination of complementary techniques (linear/spline regressions, a multivariate analogue method, artificial neural networks and recursive gap filling) was used to reconstruct missing meteorological data. The complete surface energy budget was then obtained for two dominant land cover types, fallow bush and millet, by applying the meteorological forcing data set to a finely field-calibrated land surface model. Uncertainty in reconstructed data was expressed by means of a stochastic ensemble of plausible historical time series. Climatological statistics were computed at sub-daily to decadal timescales and compared with local, regional and global data sets such as CRU and ERA-Interim. The reconstructed precipitation statistics, ∼1 °C increase in mean annual temperature from 1950 to 2009, and mean diurnal and annual cycles for all variables were in good agreement with previous studies. The new data set, denoted NAD (Niamey Airport-derived set) and publicly available, can be used to investigate the water and energy cycles in Central Sahel, while the methodology can be applied to reconstruct series at other stations. article info:eu-repo/semantics/article Journal Article info:eu-repo/semantics/publishedVersion http://agritrop.cirad.fr/583127/7/Leauthaud_et_al-2017-International_Journal_of_Climatology.pdf text Cirad license info:eu-repo/semantics/restrictedAccess https://agritrop.cirad.fr/mention_legale.html https://doi.org/10.1002/joc.4874 10.1002/joc.4874 info:eu-repo/semantics/altIdentifier/doi/10.1002/joc.4874 info:eu-repo/semantics/altIdentifier/purl/https://doi.org/10.1002/joc.4874 info:eu-repo/semantics/dataset/purl/http://www.amma-catch.org/spip.php?article240 |
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P40 - Météorologie et climatologie http://aims.fao.org/aos/agrovoc/c_6734 P40 - Météorologie et climatologie http://aims.fao.org/aos/agrovoc/c_6734 |
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P40 - Météorologie et climatologie http://aims.fao.org/aos/agrovoc/c_6734 P40 - Météorologie et climatologie http://aims.fao.org/aos/agrovoc/c_6734 Leauthaud, Crystèle Cappelaere, Bernard Demarty, Jérôme Guichard, Laurence Velluet, C. Kergoat, Laurent Vischel, T. Grippa, Manuela Mouhaimouni, M. Bouzou Moussa, Ibrahim Mainassara, I. Sultan, B. A 60-year reconstructed high-resolution local meteorological data set in Central Sahel (1950-2009): Evaluation, analysis and application to land surface modelling |
description |
The Sahel has experienced strong climate variability in the past decades. Understanding its implications for natural and cultivated ecosystems is pivotal in a context of high population growth and mainly agriculture-based livelihoods. However, efforts to model processes at the land–atmosphere interface are hindered, particularly when the multi-decadal timescale is targeted, as climatic data are scarce, largely incomplete and often unreliable. This study presents the generation of a long-term, high-temporal resolution, multivariate local climatic data set for Niamey, Central Sahel. The continuous series spans the period 1950–2009 at a 30-min timescale and includes ground station-based meteorological variables (precipitation, air temperature, relative and specific humidity, air pressure, wind speed, downwelling long- and short-wave radiation) as well as process-modelled surface fluxes (upwelling long- and short-wave radiation, latent, sensible and soil heat fluxes and surface temperature). A combination of complementary techniques (linear/spline regressions, a multivariate analogue method, artificial neural networks and recursive gap filling) was used to reconstruct missing meteorological data. The complete surface energy budget was then obtained for two dominant land cover types, fallow bush and millet, by applying the meteorological forcing data set to a finely field-calibrated land surface model. Uncertainty in reconstructed data was expressed by means of a stochastic ensemble of plausible historical time series. Climatological statistics were computed at sub-daily to decadal timescales and compared with local, regional and global data sets such as CRU and ERA-Interim. The reconstructed precipitation statistics, ∼1 °C increase in mean annual temperature from 1950 to 2009, and mean diurnal and annual cycles for all variables were in good agreement with previous studies. The new data set, denoted NAD (Niamey Airport-derived set) and publicly available, can be used to investigate the water and energy cycles in Central Sahel, while the methodology can be applied to reconstruct series at other stations. |
format |
article |
topic_facet |
P40 - Météorologie et climatologie http://aims.fao.org/aos/agrovoc/c_6734 |
author |
Leauthaud, Crystèle Cappelaere, Bernard Demarty, Jérôme Guichard, Laurence Velluet, C. Kergoat, Laurent Vischel, T. Grippa, Manuela Mouhaimouni, M. Bouzou Moussa, Ibrahim Mainassara, I. Sultan, B. |
author_facet |
Leauthaud, Crystèle Cappelaere, Bernard Demarty, Jérôme Guichard, Laurence Velluet, C. Kergoat, Laurent Vischel, T. Grippa, Manuela Mouhaimouni, M. Bouzou Moussa, Ibrahim Mainassara, I. Sultan, B. |
author_sort |
Leauthaud, Crystèle |
title |
A 60-year reconstructed high-resolution local meteorological data set in Central Sahel (1950-2009): Evaluation, analysis and application to land surface modelling |
title_short |
A 60-year reconstructed high-resolution local meteorological data set in Central Sahel (1950-2009): Evaluation, analysis and application to land surface modelling |
title_full |
A 60-year reconstructed high-resolution local meteorological data set in Central Sahel (1950-2009): Evaluation, analysis and application to land surface modelling |
title_fullStr |
A 60-year reconstructed high-resolution local meteorological data set in Central Sahel (1950-2009): Evaluation, analysis and application to land surface modelling |
title_full_unstemmed |
A 60-year reconstructed high-resolution local meteorological data set in Central Sahel (1950-2009): Evaluation, analysis and application to land surface modelling |
title_sort |
60-year reconstructed high-resolution local meteorological data set in central sahel (1950-2009): evaluation, analysis and application to land surface modelling |
url |
http://agritrop.cirad.fr/583127/ http://agritrop.cirad.fr/583127/7/Leauthaud_et_al-2017-International_Journal_of_Climatology.pdf |
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