FRAPPART, Frédéric; BIANCAMARIA, Sylvain; NORMANDIN, Cassandra; BLAREL, F.; BOURREL, L.; AUMONT, M.; AZEMAR, P.; VU, P. L.; LE TOAN, Thuy; LUBAC, Bertrand; DARROZES, J.

doi:10.1016/j.scitotenv.2018.04.326

Voir/Ouvrir

Frappart_etal2019_STOTEN.pdf (2.865Mo)

Métadonnées

Afficher la notice complète

Licence d’utilisation du document

FRAPPART, Frédéric
Géosciences Environnement Toulouse [GET]

BIANCAMARIA, Sylvain
Laboratoire d'études en Géophysique et océanographie spatiales [LEGOS]

NORMANDIN, Cassandra
Environnements et Paléoenvironnements OCéaniques [EPOC]

Langue

Article de revue

Ce document a été publié dans

Science of the Total Environment. 2018, vol. 636, p. 1520-1533

Résumé en anglais

Lakes and reservoirs have been identified as sentinels of climate change. Tonle Sap is the largest lake in both the Mekong Basin and Southeast Asia and because of the importance of its ecosystem, it is has been described as the “heart of the lower Mekong”. Its seasonal cycle depends on the annual flood pulse governed by the flow of the Mekong River. This study provides an impact analysis of recent climatic events from El Niño 1997/1998 to El Niño 2015/2016 on surface storage variations in the Tonle Sap watershed determined by combining remotely sensed observations, multispectral images and radar altimetry from 1993 to 2017. The Lake's surface water volume variations are highly correlated with rainy season rainfall in the whole Mekong River Basin (R = 0.84) at interannual time-scale. Extreme droughts and floods can be observed when precipitation deficit and excess is recorded in both the Tonle Sap watershed and the Mekong River Basin during moderate to very strong El Niño/La Niña events (R = −0.70) enhanced by the Pacific Decadal Oscillation (R = −0.68). Indian and Western North Pacific Monsoons were identified as having almost equal influence. Below normal vegetation activity was observed during the first semester of 2016 due to the extreme drought in 2015.< Réduire

Mots clés en anglais

Surface water storage

Rainfall

ENSO

PDO

Monsoon

EVI

Mekong Basin

Multi-satellite