Exchanges of Energy and Water at the Land–Atmosphere Interface
The study and understanding of land—atmosphere exchanges of energy and water has dramatically advanced since early field campaign efforts such as HAPEX and FIFE were conducted. Similarly, modeling of land—atmosphere exchanges has greatly evolved from the first generation of simple bucket model approaches. Advances in observations and modeling reflect a deeper and more sophisticated understanding of land-atmosphere interactions that transcend spatiotemporal scales and integrate numerous physical, chemical and biological processes.
This special collection of the Journal of Hydrometeorology was organized to help define the new frontier of land—atmosphere interactions. The papers contained herein contain a broad mix of field observation and modeling studies from a wide range of perspectives as well as spatial and temporal scales. Each probes fundamental process questions as they relate to how water and energy partition at the land surface—atmosphere interface and, in the case of the modeling studies, how this partitioning influences weather, climate and surface hydrological processes. While there are clearly other exchange processes that are not included, such ecosystem fluxes of trace gases, we have limited the scope here to the exchanges of energy and water, simply to put some boundaries on this specific collection. We hope this collection provides a timely synthesis of our present understanding of land-atmosphere coupling and motivates new directions in research and model development.
Enrique R. Vivoni, Arizona State University
David J. Gochis, National Center for Atmospheric Research