Prof. Dr. Thomas Foken

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AMS 101st Annual Meeting, virtually 11-15 January 2021

5B.2 - Trace gas fluxes within the forest canopy

Thomas Foken, Franz X. Meixner

January 12, 2021, 19:15 - 19:20 MEZ

Abstract: Trance gas fluxes within and above a forest canopy are highly dependent on the turbulence state in the atmospheric boundary layer and within the canopy. Gravity waves and low-level jets have a strong influence on the trace gas exchange during the night. Not only the canopy can completely decouple from the atmosphere above, but also the underbrush can decouple from the trunk space. This has a significant influence on chamber measurements. In order to determine this decoupling, parallel radon measurements can be performed, the reaction NO with O3 can be investigated or, as a very reliable indicator, flux measurements in trunk space and surface concentration measurements can be coupled via a model approach. This approach corresponds to the hydrodynamical integration of the exchange coefficient directly from the surface (wall) to the measurement height. The latter is presented and documented with measurement results from the Waldstein site (DE-Bay).



Springer Handbook of Atmospheric Measurements

Editor: Thomas Foken

This practical handbook provides a clearly structured, concise and comprehensive account of the huge variety of atmospheric and related measurements relevant to meteorologists and for the purpose of weather forecasting and climate research, but also to the practitioner in the wider field of environmental physics and ecology.

The Springer Handbook of Atmospheric Measurements is divided into six parts: The first part offers instructive descriptions of the basics of atmospheric measurements and the multitude of their influencing factors, fundamentals of quality control and standardization, as well as equations and tables of atmospheric, water, and soil quantities. The subsequent parts  present classical in-situ measurements as well as remote sensing techniques from both  ground-based as well as airborn or satellite-based methods. The next part focusses on complex measurements and methods that integrate different techniques to establish more holistic data. Brief discussions of measurements in soils and water, at plants, in urban and rural environments and for renewable energies demonstrate the potential of such applications. The final part  provides an overview of atmospheric and ecological networks.

Written by distinguished experts from academia and industry, each of the 64 chapters provides in-depth discussions of the available devices with their specifications, aspects of quality control, maintenance as well as their potential for the future. A large number of thoroughly compiled tables of physical quantities, sensors and system characteristics make this handbook a unique, universal and useful reference for the practitioner and absolutely essential for researchers, students, and technicians.

The book will be published on April 29, 2021