UC IRVINE: SCOTT MILLER, ED READ, CHRIS DOUGHTY, MIKE GOULDEN USP: HELBER FREITAS, HUMBERTO DA ROCHA Boat-Based Eddy Covariance Measurements of CO 2 Exchange.

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Presentation transcript:

UC IRVINE: SCOTT MILLER, ED READ, CHRIS DOUGHTY, MIKE GOULDEN USP: HELBER FREITAS, HUMBERTO DA ROCHA Boat-Based Eddy Covariance Measurements of CO 2 Exchange Over Amazon and Tapajos Rivers and Lakes

Motivation for measuring river-air CO2 exchange Richey et al, April 2002, Nature Letter Grace and Malhi, Nature News & Views River-Atmosphere flux ~ 1.2 T C ha -1 yr -1 Forest NEE ~ 1-2 T C ha -1 yr -1 connection to tower-based NEE results of large CO 2 uptake? Opportunity

Estimating river-air CO 2 flux, F C 1.Typically, the air-water CO2 gradient is measured and the piston velocity, k is parameterized. 2.k is (at least) wind speed dependent (linear?, quadratic?, cubic?) Piston Velocity verus Wind Speed

Methods to “measure” piston velocity, k 1.chambers (small scales, order 1 m) PRO: local measure of flux, short time scale CON: chamber disturbs airflow 2.tracer techniques (larger scales, order 10 3 km) PRO: integrated measurement CON: coarse resolution 3.eddy covariance (intermediate scales, order 10 2 m) PRO: good time resolution, direct flux CON: relatively small fluxes, flux footprint, motion corrections, density corrections

Flux Footprint Upwind distance (fetch) flux accumulation For U=4m/s, z=1.5 m, 90% of flux with 200m fetch.

Goals: Direct measurements of CO 2 flux using eddy covariance, and air-water CO 2 gradient 1.Calculate k from direct measurements 2. Compare simultaneous eddy covariance and chamber- based estimates of k

Air-side CO 2 and H 2 O Flux Measurement motion CO 2 /H 2 O wind sensor boom

Water-side pCO 2 Measurement Teflon tubing equilibrator shower head equilibrator Closed path IRGA

Sampling Strategy: Moving and Moored 10 day ship track km 83 tower lake LBA OFFICE ALTER DO CHAO Amazon

10-Day Data Set 24-hour Tapajos 24-hour Amazon Amazon ~5000 ppm CO2 Tapajos ~1000 ppm CO2 Atmospheric CO2 ~ ppm Surface ocean CO2 ~ ppm 24-hour Tapajos (lake) Air and Water CO 2 Concentrations

Raw Data upward heat flux upward CO 2 flux

Flux Corrections

CO 2 Flux versus Wind Speed note: for comparison, forest respiration ~8

CO 2 Flux versus Wind Speed

Piston Velocity: Amazon only amazon

Piston Velocity: Amazon & Tapajos tapajos amazon

Tapajos- Amazon difference: Shallow-water fetch may have contributed to higher piston velocities on the Tapajos

Conclusions Boat-based eddy covariance facilitated by the high CO2 gradient across the air-water interface, and large rivers. k for Amazon consistent with other methods and environments. k appears to vary spatially (preliminary). Thanks: Boat Crew, Bethany Reed, Daniel Amarral.