Vegetation: grass (Brachiaria brizantha) or Bare Soil or Rice Tower Data Acquisition Power System (solar panel) The Large Scale Biosphere-Atmosphere Experiment.

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Vegetation: grass (Brachiaria brizantha) or Bare Soil or Rice Tower Data Acquisition Power System (solar panel) 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

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

and now… … since March 2002

Location:

17.8 m: Sdw, Sup, Ldw,Lup,PARup, PARdw 12.0m: U,T,RH,[CO 2 ],[H 2 0] 8.7m: u’,v’,w’,T’, [CO 2 ]’,[H 2 0]’ 7.2m: U,T,RH,[CO 2 ],[H 2 0] 2.7m: U,T,RH,[CO 2 ],[H 2 0] 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) INSTRUMENTATION: Data has been collected since Sep. 2000

Eddy Correlation:

Energy Budget: Sdw > 10 W/m 2 Sdw > 10 W/m 2

Wet Season Dry Season Problems at nighttime !

Flux Tower SUNYA Tethered Balloon UFSM Accumulation Method

Transition Period - Morning

Nighttime

Coarse evaluation (Jul/30/2001): h  50 21:25, h  120 5:26 GMT If  q/  t  2 g/Kg / 8 hours: For h=50 m  LE  -10 W/m 2 h=120 m  LE  - 25 W/m 2 If  T /  t  5 0 C / 8 hours: For h=50 m  H  - 9 W/m 2 h=120 m  H  - 21 W/m 2 From Tower: Rn= -34 W/m 2

Km67 & 83 Rice Pasture wet Pasture dry Bare soil

daytime nighttime albedo PARalbedo Queimada Plantation

NEE values (using EC & profile): PeriodNEE mg m -2 s -1 NEE  mol m -2 s -1 Pasture wetJan-Jun   3.9 Pasture dryAgo- Oct   3.2 Bare soilDec Feb   2.7 Rice cropMar- May   4.5

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…