Intradiurnal variability of soil temperature, heat flux, and soil thermal diffusivity in different ecosystems in eastern Amazonian
Regina
Célia dos Santos
Alvalá, DMA-CPTEC-INPE, regina@cptec.inpe.br
(Presenting)
Julia
Clarinda Paiva
Cohen, Departamento de Meteorologia - UFPA, jcpcohen@ufpa.br
Ralf
Gielow, DMA-CPTEC-INPE, ralf@cptec.inpe.br
José
Ricardo Santos de
Souza, Departamento de Meteorologia - UFPA, jricardo@ufpa.br
Leonardo
Deane de Abreu
Sá, DMA-CPTEC-INPE, ldsa@museu-goeldi.br
Paulo
Rogério de Aquino
Arlino, DMA-CPTEC-INPE, paulo@cptec.inpe.br
Adilson
Wagner
Gandu, DCA-IAG-USP, adwgandu@model.iag.usp.br
Heat and moisture exchanges between the ground surface and the atmosphere are frequently dominant driving mechanisms for mesoscale circulations. These surface processes depend on the soil and surface characteristics, thus presenting spatial variation. Over land, significant diurnal changes of temperature and moisture balance near the interface with the atmosphere also occur. So, coupled models of heat and moisture transport in the soils near its surface require information about soil thermal properties, which are used to determine temperature profiles and heat flux in the soil. In particular over the Amazon region, a vast area has been changed into pasture or agricultural land, a change that produces significant alterations in the soil-vegetation-atmosphere interactions and, consequently, in the weather and climate. In the present work, the intradiurnal variability of soil temperature, heat flux and moisture content in eastern Amazonian are analyzed. The thermal diffusivity is iteratively obtained through a numerical solution of the heat conduction equation using soil temperature series. The measurements were collected within the Milênio-LBA program - Subproject UFPA, during the experiment CiMela ("Mesoscale Circulations in Amazonian East"), held during the dry period of 2003 in different ecosystems of the Pará State: (i) forest (Caxiunã Reserve, Melgaço - 01°42'30''S; 51°31'45'' W); (ii) pasture (Soure, Marajó Island); (iii) natural mangrove (Tracuateua Island, Bragança ); (iv) degraded mangrove (Tracuateua Island, Bragança); and (v) agricultural area (Fazenda Escola da Universidade Federal Rural da Amazônia, Igarapé Açu).
Submetido por Regina Célia dos Santos Alvalá em 18-MAR-2004