Theoretical and Applied Climatology

, Volume 39, Issue 1, pp 1–16 | Cite as

Energy flux partitioning over the Amazon forest

  • L. D. de Abreu Sá
  • Y. Viswanadham
  • A. O. Manzi
Article

Summary

The present study involved determination of the experimental energy receipt partitioning over the tropical Amazon forest. Diurnal variation of net radiation (Q*), sensible heat flux (QH) and latent heat flux (QE) is presented. The daytimeQE is in phase withQ* and it is always an important term in the energy balance. The daily averagedQE is 59 to 100% of the dailyQ* whereasQH is 5 to 28% at the Amazon forest site (2° 57′ S; 59° 57′ W) for the sample periods. The results present evidence thatQE over the Amazon forest is greater thanQ* in the afternoon hours. The role of sensible heat advection in maintaining largeQE over the forest surface is discussed. Hourly Bowen ratio (β) values for two campaigns of the Amazon forest micrometeorological experiment are presented. During daylight hours, the differences inβ are not significant, and exhibit a systematic pattern. The only time that the variation in Bowen ratio increased significantly was at sunrise and sunset when the thermal structure of the air was changing from a strong inversion to lapse and vice versa. The diurnalβ values changed from −3.50 to 0.85. The mean hourlyβ calculated from values from 07.00 to 16.00 h, varied from 0.05 to 0.85.

Keywords

Heat Flux Advection Latent Heat Flux Forest Site Thermal Structure 

Zusammenfassung

Diese Studie beschäftigt sich mit der Aufteilung der empfangenen Energie über dem tropischen Amazonasurwald. Es wird der Tagesgang der Strahlungsbilanz (Q*), des fühlbaren (QH) und des latenten Wärmestromes (QE) vorgestellt. Während der Tagesstunden istQE in Phase mitQ* und ist immer ein wichtiger Term der Energiebilanz. Das Tagesmittel vonQE beträgt 59 bis 100%,QH 5 bis 28% des täglichenQ* an den Meßtagen bei der Amazonasurwaldstation (2° 57′ S; 59° 57′ W). Die Ergebnisse legen nahe, daß in den NachmittagsstundenQE über dem Amazonasurwald größer ist alsQ*. Die Rolle der Advektion von fühlbarer Wärme zur Aufrechterhaltung des großenQE über der Waldoberfläche wird diskutiert. Für zwei Meßkampagnen wurden die stündlichen Bowenverhältnisse (β) vorgestellt. Während der Tagesstunden ergaben sich keine signifikanten Änderungen vonβ, während bei Sonnenaufgang und -untergang, wenn der thermische Aufbau der Luft von einer starken Inversion zu neutral und umgekehrt wechselt, die Unterschiede deutlich anstiegen. Die Tageswerte vonβ lagen zwischen −3.50 und 0.85. Die Stundenmittel von 7.00 bis 16.00 Uhr schwankten zwischen 0.05 und 0.85.

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Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • L. D. de Abreu Sá
    • 1
  • Y. Viswanadham
    • 1
  • A. O. Manzi
    • 1
  1. 1.Instituto de Pesquisas EspaciaisMinistério de Ciência e TecnologiaSão José dos CamposBrazil

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