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Thomas Foken and Steven Oncley

This report summarizes presentations and discussions that occurred at a workshop held in conjunction with the XIXth General Assembly of the European Geophysical Society (EGS) from 22 to 24 April 1994. The purpose of this workshop was to define the state of the art of micrometeorological flux measurements, to identify problem areas, and to define any additional data that must be taken to solve these problems. This workshop was organized in response to a proposal made at the 1993 EGS conference by T. Foken, T. Delany (National Center for Atmospheric Research), S. Oncley, and L. Tsvang (Institute of Atmospheric Physics, Russia) for a new experiment to investigate the problem of the “unclosed” energy balance. Sixty-one scientists from 14 countries participated in the workshop.

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Thomas Foken, Arden L. Buck, Russell A. Nye, and Randy D. Horn

Abstract

A novel design of a Lyman-alpha hygrometer for surface layer flux measurements is presented using a variable pathlength. The benefit of this device is the capability for in situ calibration during a field experiment with only a short interruption of the measurements of 5 min or less. A description of the device, its operating specifications, and an example of the calibration process are included.

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Thomas Foken, Marc Aubinet, John J. Finnigan, Monique Y. Leclerc, Mattthias Mauder, and Kyaw Tha Paw U

No Abstract available.

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