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Geovisualization of Air-Sea CO 2 Flux Using Volume Rendring Feng - - PowerPoint PPT Presentation
Geovisualization of Air-Sea CO 2 Flux Using Volume Rendring Feng - - PowerPoint PPT Presentation
Geovisualization of Air-Sea CO 2 Flux Using Volume Rendring Feng Zhang Zhejiang University, China 4808 Ellison Hall Zhangfeng.zju@gmail.com Human impacts on the carbon cycle are the most important cause of climate change. About 26% of the total
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About 26% of the total emissions from human activities，accumulated in the Ocean.
The ocean sink is estimated to have removed 29% of total emissions.
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Ocean remote sensing used to estimate the air-sea CO2 flux and carbon budget
l Satellite ocean color
assessment of air-sea fluxes of CO2 in a river-dominated coastal margin (Lohrenz, S.E., Cai, W.-J., 2006 )
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A series of CO2 flux images turns display
ArcGlobe ArcScence
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spatio-temporal visualization method for air-sea CO2 flux
Source: Yellow Bubble rise from the deep sea to the air, larger and larger burst in the air Sinks: Blue Bubble down from the air to the deep sea, smaller and smaller to disappear
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Show the ocean carbon source and sinks
l Research on 3D spatio-temperal visualization of
air-sea CO2 fluxes. Journal of Zhejiang University. Sciences Edition 38, 229-233 (2010)
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- Animation not fluent
The size and count of bubble more decided by the grid size. It can’t reflect the spatial distribution
Research on 3D spatio-temperal visualization of air-sea CO2 fluxes. Journal of Zhejiang University. Sciences Edition 38, 229-233
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A new way
l Refine the grid size ---à overload computation l Speed up the movement of the Bubble
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A new way
l Refine the grid size ---à overload computation l Speed up the movement of the Bubble l Slow l More slowly l Too too slowly
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A new way
l Refine the grid size ---à overload computation l Speed up the movement of the Bubble l air-sea CO2 flux products are constructed
as particle systems
l volume rendering works efficiently by GPU
acceleration
l Large data are loaded in parallel and on
demand for real-time visualization
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spatio-temporal dynamics
- f carbon sinks and sources
- A GPU-based direct volume rendering
using half-angle slicing
- Visualize the release or absorb CO2 gas
with shadow effects.
- Generate four-dimensional (4D) data from
satellite-derived air-sea CO2 flux products
- An out-of-core scheduling strategy for on-
the-fly rendering of time series of satellite data
- The air-sea carbon budget and accumulating process
- Present distribution pattern and variation of CO2 flux are expressed by color
changes
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