First assessment of optical and microwave remotely sensed vegetation proxies in monitoring aboveground carbon in tropical Asia
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First assessment of optical and microwave remotely sensed vegetation proxies in monitoring aboveground carbon in tropical Asia. / Cui, Tianxiang; Fan, Lei; Ciais, Philippe; Fensholt, Rasmus; Frappart, Frédéric; Sitch, Stephen; Chave, Jérome; Chang, Zhongbing; Li, Xiaojun; Wang, Mengjia; Liu, Xiangzhuo; Ma, Mingguo; Wigneron, Jean Pierre.
I: Remote Sensing of Environment, Bind 293, 113619, 2023.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning › fagfællebedømt
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TY - JOUR
T1 - First assessment of optical and microwave remotely sensed vegetation proxies in monitoring aboveground carbon in tropical Asia
AU - Cui, Tianxiang
AU - Fan, Lei
AU - Ciais, Philippe
AU - Fensholt, Rasmus
AU - Frappart, Frédéric
AU - Sitch, Stephen
AU - Chave, Jérome
AU - Chang, Zhongbing
AU - Li, Xiaojun
AU - Wang, Mengjia
AU - Liu, Xiangzhuo
AU - Ma, Mingguo
AU - Wigneron, Jean Pierre
N1 - Publisher Copyright: © 2023 Elsevier Inc.
PY - 2023
Y1 - 2023
N2 - Tropical Asia has shown a strong greening trend in recent years. However, detailed knowledge about changes in carbon stocks remain uncertain as only few studies have used remotely sensed vegetation products for monitoring spatial and temporal changes of aboveground live biomass carbon (AGC) in that region. This study aims at evaluating optical- and microwave-based vegetation proxies (i.e., LAI, percent tree cover (PTC), L−/X-/C-band vegetation optical depths (VOD)) for understanding the spatio-temporal variations of tropical Asian AGC between 2013 and 2019. Our results indicated that the spatial distributions of L-VOD and PTC were highly spatially correlated with four benchmark AGC maps used for comparison (R > 0.79 and R > 0.75, respectively). By employing L-VOD as the reference data in assessing AGC dynamics, the X-/C-VOD showed advantages in capturing AGC changes for low-medium (20–40 Mg C/ha) carbon density vegetation, respectively, while other vegetation proxies showed limited capabilities. All proxies presented limitations in tracking AGC dynamics at high AGC density (> 60 Mg C/ha). Tropical Asian AGC stocks estimated using the L-VOD product indicated that tropical Asia accumulated carbon in biomass at a rate of +44+39+53 Tg C/yr between 2013 and 2019. This small sink is dominated by non-forest biomes (65.9%). The non-forest regions in southern India, southwest China, and southern Vietnam and southwest China showed a continuous AGC increase while forests in northern Laos, Malaysia, and central Indonesia experienced continuous decreases between 2013 and 2019 caused by deforestation.
AB - Tropical Asia has shown a strong greening trend in recent years. However, detailed knowledge about changes in carbon stocks remain uncertain as only few studies have used remotely sensed vegetation products for monitoring spatial and temporal changes of aboveground live biomass carbon (AGC) in that region. This study aims at evaluating optical- and microwave-based vegetation proxies (i.e., LAI, percent tree cover (PTC), L−/X-/C-band vegetation optical depths (VOD)) for understanding the spatio-temporal variations of tropical Asian AGC between 2013 and 2019. Our results indicated that the spatial distributions of L-VOD and PTC were highly spatially correlated with four benchmark AGC maps used for comparison (R > 0.79 and R > 0.75, respectively). By employing L-VOD as the reference data in assessing AGC dynamics, the X-/C-VOD showed advantages in capturing AGC changes for low-medium (20–40 Mg C/ha) carbon density vegetation, respectively, while other vegetation proxies showed limited capabilities. All proxies presented limitations in tracking AGC dynamics at high AGC density (> 60 Mg C/ha). Tropical Asian AGC stocks estimated using the L-VOD product indicated that tropical Asia accumulated carbon in biomass at a rate of +44+39+53 Tg C/yr between 2013 and 2019. This small sink is dominated by non-forest biomes (65.9%). The non-forest regions in southern India, southwest China, and southern Vietnam and southwest China showed a continuous AGC increase while forests in northern Laos, Malaysia, and central Indonesia experienced continuous decreases between 2013 and 2019 caused by deforestation.
KW - Above ground carbon
KW - Microwave remote sensing
KW - Optical vegetation proxies
KW - Tropical Asia
KW - Vegetation optical depth
U2 - 10.1016/j.rse.2023.113619
DO - 10.1016/j.rse.2023.113619
M3 - Journal article
AN - SCOPUS:85158874376
VL - 293
JO - Remote Sensing of Environment
JF - Remote Sensing of Environment
SN - 0034-4257
M1 - 113619
ER -
ID: 357517464