The Energy Budget at the Earths Surface: Estimates of the Diffusion Resistance of Some Large Sunflower Leaves in the Field

Abstract

Studies of resistance to gaseous exchange between large sunflower leaves and the bulk air in a crop canopy were made. Two components of the diffusive pathway for mass and sensible heat were evaluated; (a) the resistance from the interior of the leaf to the leaf surface, and (b) the resistance from the surface of the leaf through the leaf boundary air layer to the bulk air. It was found that: (a) leaf resistance not only displays diurnal trends but shorter fluctuations, and (b) boundary air layer resistance was significantly smaller than predicted from classical boundary layer formulae.

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Document Details

Document Type
Technical Report
Publication Date
Aug 01, 1967
Accession Number
AD0664215

Entities

People

  • E. R. Lemon
  • Ivan I. Impens
  • L. A. Hunt

Organizations

  • Agricultural Research Service

Tags

Communities of Interest

  • Advanced Electronics
  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Air Temperature
  • Boundaries
  • Boundary Layer
  • Diffusion
  • Elastic Properties
  • Field Conditions
  • Flow
  • Heat Energy
  • Heat Transfer
  • Layers
  • Measurement
  • New York
  • Radiation
  • Resistance
  • Solar Radiation
  • Vapors
  • Water Vapor

Readers

  • Coastal Oceanography
  • Combustion science or combustion engineering.
  • Wetland-Land-Environmental Management.