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Ideas and perspectives: Tree–atmosphere interaction responds to water-related stem variations

Abstract. Land–atmosphere interactions depend on momentum transfer from the atmosphere
to the canopy, which in turn depends on the tree drag coefficient. It is
known that the drag coefficient, and thus tree–atmosphere momentum transfer,
can vary strongly within a canopy. Yet, only few measurements are available
to study the variation of tree–atmosphere momentum transfer in time and
space, and in response to tree water deficit. In this paper we use
accelerometers to estimate tree–atmosphere momentum transfer for 19
individual trees of 7 different species in the Brazilian Amazon. The 5-month
monitoring period included the transition from wet to dry months. Here, we
demonstrate that, under field conditions, tree–atmosphere momentum transfer
can vary considerably in time and space (up to a factor of 2.5). Increased
water-related stem variations during the dry months are related to observed
changes in tree–atmosphere momentum transfer, which is hypothesized to be
caused by tree-water-deficit-induced changes in tree mass.
