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Vegetation: grass (Brachiaria brizantha) or Bare Soil or Rice

The Large Scale Biosphere-Atmosphere Experiment in Amazonia – km 77 RK Sakai, DR Fitzjarrald, R Staebler, M. Czikowsky, A. Tsoyroef (1) OL Moraes, O Acevedo, R. Silva (2) E Brait, V M Silva (3) (1) SUNYA - (2) UFSM - (3) LBA office at Santarem. Data Acquisition. Tower. Power System

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Vegetation: grass (Brachiaria brizantha) or Bare Soil or Rice

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  1. The Large Scale Biosphere-Atmosphere Experiment in Amazonia – km 77RK Sakai, DR Fitzjarrald, R Staebler, M. Czikowsky, A. Tsoyroef(1)OL Moraes, O Acevedo, R. Silva (2)E Brait, V M Silva (3)(1) SUNYA - (2) UFSM - (3) LBA office at Santarem Data Acquisition Tower Power System (solar panel) Vegetation: grass (Brachiaria brizantha) or Bare Soil or Rice

  2. Km 77: response to land use change CD-03 UAlbany/UFSM January 2002 plowed October 2000 pasture November 2001 burning H LE C night Burn C day Albedos Net radiation Soil moisture 2000 2001

  3. and now… … since March 2002

  4. Location: Km 77

  5. INSTRUMENTATION: 17.8 m: Sdw, Sup, Ldw,Lup,PARup, PARdw 12.0m: U,T,RH,[CO2],[H20] 8.7m: u’,v’,w’,T’, [CO2]’,[H20]’ 7.2m: U,T,RH,[CO2],[H20] 2.7m: U,T,RH,[CO2],[H20] pressure, precipitation, Sodar(no continuous) Soil probes: Tsoil (-0.14,-0.24,-0.5,-1.5,2.0 m) Gsoil (-0.19, -1.0m) Fsoil (-0.29 m) Data has been collected since Sep. 2000

  6. Eddy Correlation:

  7. Sdw > 10 W/m2 Energy Budget: Sdw > 10 W/m2

  8. Dry Season Wet Season Problems at nighttime !

  9. Accumulation Method Tethered Balloon UFSM Flux Tower SUNYA

  10. Transition Period - Morning

  11. Transition Period - Morning

  12. Nighttime

  13. Coarse evaluation (Jul/30/2001): h  50 m @ 21:25, h  120 m @ 5:26 GMT If q/ t  2 g/Kg / 8 hours: For h=50 m  LE  -10 W/m2 h=120 m  LE  - 25 W/m2 If T / t  50C / 8 hours: For h=50 m  H  - 9 W/m2 h=120 m  H  - 21 W/m2 From Tower: Rn= -34 W/m2

  14. Bare soil Pasture dry Pasture wet Rice Km67 & 83

  15. Plantation nighttime daytime albedo PARalbedo Queimada

  16. NEE values (using EC & profile):

  17. Summary & Future work • EC measurements and phenology are consistent • Defined Rain season and Dry season • Albedo/PAR-albedo have different behaviors • Fluxes at daytime are ok. Problems at nighttime – problems with • carbon budget (respiration estimates). • Accumulation method can solve the problem. Estimates of NBL • height using the unbalance of Energy Budget at night. Case • studies with tethered balloon. • Needs to monitor the land use -> what’s going to happen next…

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