Abstract
Turbulent transport processes for carbon dioxide and water vapor in unstable conditions are studied using data observed just above plant canopies in a paddy field. The analysis of joint probability distributions of w-wc and w-wq confirmed that, just above plant canopies, downdrafts were remarkably efficient for vertical transport of carbon dioxide and water vapor in neutral conditions. Furthermore, it was shown that updrafts became more efficient than downdrafts for vertical transport of carbon dioxide and water vapor in very unstable conditions. The stability dependence of carbon dioxide and water vapor transport was similar to that of sensible heat transport.
