Horizon / Plein textes La base de ressources documentaires de l'IRD

IRD

 

Publications des scientifiques de l'IRD

Satge Frédéric, Ruelland D., Bonnet Marie-Paule, Molina J., Pillco R. (2019). Consistency of satellite-based precipitation products in space and over time compared with gauge observations and snow-hydrological modelling in the Lake Titicaca region. Hydrology and Earth System Sciences, 23 (1), 595-619. ISSN 1027-5606

Fichier PDF disponiblehttp://horizon.documentation.ird.fr/exl-doc/pleins_textes/divers19-02/010075130.pdf[ PDF Link ]

Lien direct chez l'éditeur doi:10.5194/hess-23-595-2019

Titre
Consistency of satellite-based precipitation products in space and over time compared with gauge observations and snow-hydrological modelling in the Lake Titicaca region
Année de publication2019
Type de documentArticle référencé dans le Web of Science WOS:000457487100001
AuteursSatge Frédéric, Ruelland D., Bonnet Marie-Paule, Molina J., Pillco R.
SourceHydrology and Earth System Sciences, 2019, 23 (1), p. 595-619. ISSN 1027-5606
RésuméThis paper proposes a protocol to assess the space-time consistency of 12 satellite-based precipitation products (SPPs) according to various indicators, including (i) direct comparison of SPPs with 72 precipitation gauges; (ii) sensitivity of streamflow modelling to SPPs at the outlet of four basins; and (iii) the sensitivity of distributed snow models to SPPs using a MODIS snow product as reference in an un-monitored mountainous area. The protocol was applied successively to four different time windows (2000-2004, 20042008, 2008-2012 and 2000-2012) to account for the space-time variability of the SPPs and to a large dataset composed of 12 SPPs (CMORPH-RAW v.1, CMORPH-CRT v.1, CMORPH-BLD v. 1, CHIRP v.2, CHIRPS v.2, GSMaP v. 6, MSWEP v. 2.1, PERSIANN, PERSIANN-CDR, TMPART v. 7, TMPA-Adj v.7 and SM2Rain-CCI v. 2), an unprecedented comparison. The aim of using different space scales and timescales and indicators was to evaluate whether the efficiency of SPPs varies with the method of assessment, time window and location. Results revealed very high discrepancies between SPPs. Compared to precipitation gauge observations, some SPPs (CMORPH-RAW v. 1, CMORPH-CRT v. 1, GSMaP v. 6, PERSIANN, and TMPA-RT v. 7) are unable to estimate regional precipitation, whereas the others (CHIRP v.2, CHIRPS v.2, CMORPH-BLD v. 1, MSWEP v.2.1, PERSIANN-CDR, and TMPA-Adj v. 7) produce a realistic representation despite recurrent spatial limitation over regions with contrasted emissivity, temperature and orography. In 9 out of 10 of the cases studied, streamflow was more realistically simulated when SPPs were used as forcing precipitation data rather than precipitation derived from the available precipitation gauge networks, whereas the SPP's ability to reproduce the duration of MODIS-based snow cover resulted in poorer simulations than simulation using available precipitation gauges. Interestingly, the potential of the SPPs varied significantly when they were used to reproduce gauge precipitation estimates, streamflow observations or snow cover duration and depending on the time window considered. SPPs thus produce space-time errors that cannot be assessed when a single indicator and/or time window is used, underlining the importance of carefully considering their space-time consistency before using them for hydro-climatic studies. Among all the SPPs assessed, MSWEP v. 2.1 showed the highest space-time accuracy and consistency in reproducing gauge precipitation estimates, streamflow and snow cover duration.
Plan de classementHydrologie [062] ; Télédétection [126] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
Descr. géo.PEROU ; BOLIVIE ; ANDES ; TITICACA LAC
LocalisationFonds IRD [F B010075130]
Identifiant IRDfdi:010075130
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010075130

Export des données

Disponibilité des documents

Télechargment fichier PDF téléchargeable

Lien sur le Web lien chez l'éditeur

Accès réservé en accès réservé

HAL en libre accès sur HAL


* PDF Link :

    à télécharger pour citer/partager ce document sur les réseaux sociaux académiques


Accès aux documents originaux :

Le FDI est labellisé CollEx

Accès direct

Bureau du chercheur

Site de la documentation

Espace intranet IST (accès réservé)

Suivi des publications IRD (accès réservé)

Mentions légales

Services Horizon

Poser une question

Consulter l'aide en ligne

Déposer une publication (accès réservé)

S'abonner au flux RSS

Voir les tableaux chronologiques et thématiques

Centres de documentation

Bondy

Montpellier (centre IRD)

Montpellier (MSE)

Cayenne

Nouméa

Papeete

Abidjan

Dakar

Niamey

Ouagadougou

Tunis

La Paz

Quito