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Mesoclimate of the LBA-ECO Santarem Study Area
David FitzjarraldRicardo SakaiOsvaldo MoraesMatt CzikowskyOtavio AcevedoRaimundo Cosme de Oliveira Junior
CD-03 University at Albany, SUNYUniversidade Federal de Santa MariaEMBRAPA Amazonia Oriental
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LBA-ECO weather station networkResurrected at the behest of the LBA Science Team (Miami meeting).
Motivation:Determine regional biases/seasonal differences(develop a methodology to determine context inwhich flux observations are made.)
* Study the physical basis for the river breeze
• identify mesoclimatic variabilities:•Cloudiness (incident solar radiation)*Temperature/Humidity* Precipitation
*gasp) support model studies…
*Accommodate the few remaining literalists who use real (vs. reanalysis) data
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LBA-ECO STM site special features…
•Large seasonal variation
•High correlation precipitation/ENSO signal
•World class amplitude semidiurnal atm P tide
• Strong influence river breeze/easterly interaction
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Recent years in the LBA-ECO STM region:
Pbel
Pbel - Pstm
Tstm Ustm
S O index
Precipitacao
CIRSAN
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qsat
Intraannual variability small but important…
Cp T
L q
RH smaller
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This presentation from now on:
Focus on diurnal variability ( & seasonal)
Other (continuing) workIdentify inland penetration of River breeze;frequency of occurrence;Gauge seasonal/interannual varibility;Minimize biases in standard climate data.Identify local wind circulations (e.g., Acevedo et al. presentation yesterday.)
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Silva Dias et al., 2003
Cloudiness delineates the river….
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Moore et al. 2001
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Estacoes automaticas: (Campbell Sci.)Medidas: T, RH, K incidente, PAR incidente, T solo, Umidade solo, Pressao superficie, U, direccao,Precipitacao, GPS (relogio).
2 USFS (Keller), upgraded [julho 1998, Belterra, km117]3 LBA-ECO [julho 2000, Jamaraqua, Mojui, Guarana]3 EMBRAPA,upgraded [set 2002, Franca, CG, C-U]
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Available hourly data, flux tower km67
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Wind rose
Available date km83 flux tower
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Hourly data, LBA-ECO weather stations…
River
River
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Km 77 flux tower…..
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wind rose
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km67
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km67
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Local sites always make a difference in windobservations.
Fujita Transmission Factors, LBA-ECO WX stations.
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km117 pasture siteJamaraquaTapajos site
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River sites
Incident global short-wave radiation
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Vila Franca
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Specific humidity, double peaks show CBL birth/death
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Std deviation of wind direction—separating theconvective portion of the day….
Jamaraqua
Franca
Cacoal Grande
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2 C
River stations
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Maximum wind events….k 2001 350 1300 7.28j 2003 84 1330 7.74m 2001 204 0220 7.11g 2002 19 1200 6.81c 2001 54 1700 6.44s 2003 37 2000 3.94f 2002 68 1000 4.22e 2002 208 0430 9.91
River
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From Silva Dias et al., 2003
Sodar, Santarem airport…….
NCL
NCLriverObserver report..
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…and also look at interannual differences in theOnset of the wet season.
NO clouds at night, dry season….
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From before……
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Radiative consequences of cloud cover…
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River stations
Standard deviation of global solar radiation….
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qsat
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(See CD-03: Czikowsky et al. poster for details on the ceilometer observations at km67)
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The “natural clock” of the tropics….
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River breeze mesoscale pressure gradientcan extract from station data; lookslike model simulation results—(Silva Dias et al., 2003)
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River-inland differences:2 C temperature bias
20% cloud reduction in Kdn
Still searching for the precipitation signal
River breeze expressed actively for slack easterly cases.
Cloud base determined by thermodynamics in cleared areas.
Nocturnal winds appreciable only along river(a counter-current nocturnal river of air)
River convective day and night.
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Balao cativo –estudos no futuro……