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

TowerData

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 2000pasture

January 2002plowed

November 2001burning

Km 77: response to land use change

H

LE

C

night

CD-03 UAlbany/UFSM

and now…

… since March 2002

Location:

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)

INSTRUMENTATION:

Data has been collected sinceSep. 2000

EddyCorrelation:

Energy Budget: Sdw > 10 W/m2

Sdw > 10 W/m2

Wet Season Dry Season

Problems at nighttime !

Flux TowerSUNYA

TetheredBalloonUFSM

Accumulation Method

Transition Period - Morning

Transition Period - Morning

Nighttime

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

Km67 & 83

Rice

Pasture wet

Pasture dry

Bare soil

daytime

nighttime

albedo

PARalbedo

Queimada

Plantation

NEE values (using EC & profile):

Period NEE

mg m-2s-1

NEE

mol m-2s-1

Pasture wet Jan-Jun 2001

-0.100.17 -2.293.9

Pasture dry Ago-Oct2001

-0.060.14 -1.473.2

Bare soil Dec 2001-Feb 2002

+0.080.12 +1.82.7

Rice crop Mar- May 2002

-0.240.2 -5.424.5

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…