flux observation: integrating fluxes derived from ground station and satellite remote sensing...
TRANSCRIPT
![Page 1: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/1.jpg)
Flux observation: Integrating fluxes derived from
ground station and satellite remote sensing
王鹤松 Hesong Wang Institute of atmospheric physics, Chinese Academy of Sciences
![Page 2: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/2.jpg)
李正权, 2006
Why integrating ? (precision and scale)
•The fluxes of water, energy and carbon are important variables in climate modeling, are also key processes in land surface–atmosphere interactions.
•Regional extrapolation of field based flux measurements is still a challenging task due to the high spatial and temporal variability of terrestrial ecosystems across complex landscapes and regions. •The application of satellite remote sensing has greatly enhanced global scale observations of flux over heterogeneous landscapes.
![Page 3: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/3.jpg)
Focus on the flux in terrestrial ecosystem
(especially in northern China)
• Observation in station scale (such as EC, TDP, Licor series etc.) and regional scale (such as Landsat, MODIS, MERIS etc.);
• Integration of remote sensing and flux measurements to the generate regional products with high accuracy.
![Page 4: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/4.jpg)
Observation of fluxes in ground stations
Photosynthesis Respiration Sap flow
Eddy covariance (EC) measurement in Tongyu, a CEOP reference station (grassland and cropland)
![Page 5: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/5.jpg)
Regional Integration:Coordinated flux measurements in northern China
Intensive calibration was done weeks before the coordinated enhanced observation period to make those site scale data comparable.
![Page 6: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/6.jpg)
LUEmax derived from our method
LUEmax derived from MOD17
Deriving maximal light use efficiency regional gross primary production modeling
![Page 7: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/7.jpg)
EC measured GPP (g C/m2) in 8-day
Pre
dict
ed
GP
P (
g C
/m2 )
in
8-
day
Grass sites Forest sites
Crop sites All sites
y = 0.9576x + 0.6142R2 = 0.82, p<0.01
y = 1.0732x + 2.4747R2 = 0.57, p<0.05
y = 0.7235x + 13.483R2 = 0.69, p<0.01
y = 0.8564x + 5.9414R2 = 0.79, p<0.01
Simulated GPP VS. Measured GPPSimulated GPP VS. Measured GPP
![Page 8: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/8.jpg)
Spatial pattern of GPP in northern China
![Page 9: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/9.jpg)
Main landcover types and their dynamics of GPP in northern China
For more details, see paper published in RSE (Wang et al., 2010)
![Page 10: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/10.jpg)
DOY 185
DOY 201
DOY 209
DOY 225
NDVI
LST
difference in day and night (K)
Triangle of Ts-VI method to estimate EF and Triangle of Ts-VI method to estimate EF and to calculate ET in northern China to calculate ET in northern China
![Page 11: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/11.jpg)
Simulated EF VS. Measured EFSimulated EF VS. Measured EF
![Page 12: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/12.jpg)
mm/Day
Seasonality of ET in northern China Seasonality of ET in northern China
![Page 13: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/13.jpg)
Main landcover types and their dynamics of ET in northern China
![Page 14: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/14.jpg)
Heterogeneity in simulating flux
![Page 15: Flux observation: Integrating fluxes derived from ground station and satellite remote sensing 王鹤松 Hesong Wang Institute of atmospheric physics, Chinese](https://reader035.vdocuments.mx/reader035/viewer/2022062803/56649f295503460f94c421d8/html5/thumbnails/15.jpg)
谢谢! Thank you !