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In June 2007, a regional campaign will take place in the U.S. Southern Great Plains (SGP) to estimate surface fluxes of CO2, water, and energy at 1 to 100 km scales. The goal of this campaign is to understand the influence of land cover, moisture gradients, and atmospheric transport on these fluxes and their estimation. As part of the North American Carbon Program (NACP) we will focus on comparing top-down and bottom-up flux estimates.
This project is part of the Cloud and Land Surface Interaction Campaign (CLASIC) and NACP.
This web page describes the experiments planned during CLASIC, June 9-29, 2007. For ongoing carbon cycle measurements click here.
ATMOSPHERIC CARBON MEASUREMENTS by Aircraft during CLASIC
Cessna 206 and CIRPAS Twin Otter:
Cessna 206 |
CIRPAS Twin Otter |
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Regional CO2, Water, and Energy Fluxes and Surface Forcing for CLASIC (Regional CO2, Water, and Energy Fluxes and Surface Forcing for CLASIC “Bottom up”)
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Land-surface fluxes of energy, water, and CO2 will be modeled at 250 m resolution and aggregated to 10 km using a land surface model (ISOLSM), MODIS data, and Mesonet meteorological forcing.
Goal 1. Produce fine scale, tested, land surface forcing maps for CLASIC
Goal 2. Produce regional CO2 flux estimates, to compare with
top-down estimates based on boundary layer budgeting and inverse modeling.
Intensive Land Surface Characterization at Three Super Sites
There will be four Super Sites with eddy flux towers in the major land cover types (winter wheat, pasture, oak forest, summer crops).
The Duke Helicopter Observation Platform (HOP) will measure CO2, water, and energy fluxes in the boundary and surface layers. layer, including the surface layer a few meters above the surface. PI: Roni Avissar.
Soil Moisture will be studied with airborne observing systems, including
PSR and MODIS Airborne Simulator and JPL Passive/Active L and S band (v2).
The ER-2 is flying. [more
info]
The NASA ER-2 will be equipped with downward looking cloud (95-GHz) and precipitation (3-cm) radars, as well as sensors to generate high resolution fields of soil moisture for the region.
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PBL-Free Troposphere Mixing Under Conditions of Fair Weather Cumulus
To improve models of cloud-induced fluxes and entrainment, airborne measurements of CO2 and related species in the boundary layer and free troposphere, made on days with fair weather cumulus, will be analyzed with tracer-transport and atmospheric dynamics models.
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“Top Down” Regional CO2 Flux Estimation Using Lagrangian Flights
We will use atmospheric concentration data to estimate surface fluxes and understand atmospheric transport. Planned approaches include:
This work was supported primarily by the Atmospheric Radiation Measurement program, Office of Science, U.S. Department of Energy, with additional support and collaboration from USDA, NASA, and NOAA.
This work was supported primarily by the Atmospheric Radiation Measurement program, Office of Science, U.S. Department of Energy, with additional support and collaboration from USDA, NASA, and NOAA.
