A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...
A Look at Amazon Basin Seasonal Dynamics with the Biophysical ... A Look at Amazon Basin Seasonal Dynamics with the Biophysical ...
Interannual variability of Soil moisture and Vegetation BiomassIn Amazonian CerradoM. Simard and S. SaatchiMS 300-319Jet Propulsion LaboratoryCalifornia Institute of TechnologyPasadena, CA 91109Tel: (818) 354-6972Fax: (818) 393-5184E-mail: marc.simard@jpl.nasa.govThe Cerrado is the second most important biome in South America, which covers nearly 1.8Mkm2 in Brazil and is a significant factor in the regional carbon cycle. According to most recentestimates, the total area and the rate of the clearing (mainly due to fire) in Cerrado region ishigher than the central Amazonian rainforest. On a larger scale, Cerrado is also a dynamicsystem because of its seasonal changes in moisture and vegetation biomass and its sensitivity toclimate variability and change. In this paper, we use a time series of coarse spatial resolutionremote sensing data to examine the interannual variability of vegetation biomass and soilmoisture over the Amazonian Cerrado. Space-borne scatterometer (ERS and Quickscat), andAVHRR NDVI (GAC) data over past 10 years (1992-2001) are used in a synergistic approach toseparate the moisture and vegetation signal in the time series analysis. Scatterometer data isfrom an active microwave sensor with relatively coarse spatial resolution (25 km to 50 km) andhigh temporal resolution (daily). In its enhanced resolution mode, with 5 km resolution and 5-10day composites, the data is compatible with the AVHRR NDVI global composites of 8 kmresolution and 10-15 day composites. These two data sets are used to build a continuous timeseries data set for the past decade. By combining these data sets with existing precipitation data,and utilizing the sensitivity of each data set to biomass and moisture we decoupled the twoeffects. It is shown that, the scatterometer data is a useful instrument to monitor the rain eventsand moisture variability in Cerrado region. As the temporal dynamics of vegetation biomass inthis region is strongly linked with seasonal water availability, the results of this analysis canprovide the necessary long-term observation of carbon and water cycle within the Amazonianand LBA context.
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Interannual variability of Soil moisture and Veget<strong>at</strong>ion BiomassIn <strong>Amazon</strong>ian CerradoM. Simard and S. Sa<strong>at</strong>chiMS 300-319Jet Propulsion Labor<strong>at</strong>oryCalifornia Institute of TechnologyPasadena, CA 91109Tel: (818) 354-6972Fax: (818) 393-5184E-mail: marc.simard@jpl.nasa.govThe Cerrado is <strong>the</strong> second most important biome in South America, which covers nearly 1.8Mkm2 in Brazil and is a significant factor in <strong>the</strong> regional carbon cycle. According to most recentestim<strong>at</strong>es, <strong>the</strong> total area and <strong>the</strong> r<strong>at</strong>e of <strong>the</strong> clearing (mainly due to fire) in Cerrado region ishigher than <strong>the</strong> central <strong>Amazon</strong>ian rainforest. On a larger scale, Cerrado is also a dynamicsystem because of its seasonal changes in moisture and veget<strong>at</strong>ion biomass and its sensitivity toclim<strong>at</strong>e variability and change. In this paper, we use a time series of coarse sp<strong>at</strong>ial resolutionremote sensing d<strong>at</strong>a to examine <strong>the</strong> interannual variability of veget<strong>at</strong>ion biomass and soilmoisture over <strong>the</strong> <strong>Amazon</strong>ian Cerrado. Space-borne sc<strong>at</strong>terometer (ERS and Quicksc<strong>at</strong>), andAVHRR NDVI (GAC) d<strong>at</strong>a over past 10 years (1992-2001) are used in a synergistic approach tosepar<strong>at</strong>e <strong>the</strong> moisture and veget<strong>at</strong>ion signal in <strong>the</strong> time series analysis. Sc<strong>at</strong>terometer d<strong>at</strong>a isfrom an active microwave sensor <strong>with</strong> rel<strong>at</strong>ively coarse sp<strong>at</strong>ial resolution (25 km to 50 km) andhigh temporal resolution (daily). In its enhanced resolution mode, <strong>with</strong> 5 km resolution and 5-10day composites, <strong>the</strong> d<strong>at</strong>a is comp<strong>at</strong>ible <strong>with</strong> <strong>the</strong> AVHRR NDVI global composites of 8 kmresolution and 10-15 day composites. These two d<strong>at</strong>a sets are used to build a continuous timeseries d<strong>at</strong>a set for <strong>the</strong> past decade. By combining <strong>the</strong>se d<strong>at</strong>a sets <strong>with</strong> existing precipit<strong>at</strong>ion d<strong>at</strong>a,and utilizing <strong>the</strong> sensitivity of each d<strong>at</strong>a set to biomass and moisture we decoupled <strong>the</strong> twoeffects. It is shown th<strong>at</strong>, <strong>the</strong> sc<strong>at</strong>terometer d<strong>at</strong>a is a useful instrument to monitor <strong>the</strong> rain eventsand moisture variability in Cerrado region. As <strong>the</strong> temporal dynamics of veget<strong>at</strong>ion biomass inthis region is strongly linked <strong>with</strong> seasonal w<strong>at</strong>er availability, <strong>the</strong> results of this analysis canprovide <strong>the</strong> necessary long-term observ<strong>at</strong>ion of carbon and w<strong>at</strong>er cycle <strong>with</strong>in <strong>the</strong> <strong>Amazon</strong>ianand LBA context.
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