The Niwot Ridge Subalpine Forest US-NR1 AmeriFlux site – Part&nbsp;1: Data acquisition and site record-keeping

Burns, Sean P.; Maclean, Gordon D.; Blanken, Peter D.; Oncley, Steven P.; Semmer, Steven R.; Monson, Russell K.

doi:10.5194/gi-5-451-2016

The Niwot Ridge Subalpine Forest US-NR1 AmeriFlux site – Part 1: Data acquisition and site record-keeping

Journal Article · Thu Sep 29 00:00:00 EDT 2016 · Geoscientific Instrumentation, Methods and Data Systems (Online)

DOI:https://doi.org/10.5194/gi-5-451-2016· OSTI ID:1327433

; Maclean, Gordon D.; Blanken, Peter D.; Oncley, Steven P.; Semmer, Steven R.; Monson, Russell K.

Abstract. The Niwot Ridge Subalpine Forest AmeriFlux site (US-NR1) has been measuring eddy-covariance ecosystem fluxes of carbon dioxide, heat, and water vapor since 1 November 1998. Throughout this 17-year period there have been changes to the instrumentation and improvements to the data acquisition system. Here, in Part 1 of this three-part series of papers, we describe the hardware and software used for data-collection and metadata documentation. We made changes to the data acquisition system that aimed to reduce the system complexity, increase redundancy, and be as independent as possible from any network outages. Changes to facilitate these improvements were (1) switching to a PC/104-based computer running the National Center for Atmospheric Research (NCAR) In-Situ Data Acquisition Software (NIDAS) that saves the high-frequency data locally and over the network, and (2) time-tagging individual 10 Hz serial data samples using network time protocol (NTP) coupled to a GPS-based clock, providing a network-independent, accurate time base. Since making these improvements almost 2 years ago, the successful capture of high-rate data has been better than 99.98 %. We also provide philosophical concepts that shaped our design of the data system and are applicable to many different types of environmental data collection.

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Sponsoring Organization:: USDOE

OSTI ID:: 1327433

Alternate ID(s):: OSTI ID: 1375714

Journal Information:: Geoscientific Instrumentation, Methods and Data Systems (Online), Journal Name: Geoscientific Instrumentation, Methods and Data Systems (Online) Journal Issue: 2 Vol. 5; ISSN 2193-0864

Publisher:: Copernicus Publications, EGUCopyright Statement

Country of Publication:: Germany

Language:: English

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