SPECTRONUS DATA RETRIEVAL Developed for Windows 7, data visualisation is easy with rolling graphs which can zoom in and out of either current or legacy data. Field and lab campaigns continuously collect data and so does the Spectronus multi-threaded software. Tasks running in parallel to analysis time, ensures that data collection can continue whilst analysis is performed. Tasks can be custom built by the user with no restriction on their length or complexity. Setting up the tasks is simplified with the new drag and drop task builder interface. Data can be extracted from the underlying SQL database to a CSV file which then allows compatibility with any data analysis packages on the market. STABILITY The stability of the system allows the precision to meet the GAW standards with at most monthly calibration. This stability is demonstrated by sampling target gas daily over 10 months and the result is shown in Figure 4. Target gas measurements can also be fully automated through one of the four standard inlets or an optional Vici-Valco multiport valve or auxiliary manifold, instead of the sampling line. The Spectronus can control hardware on RS232 or digital interfaces allowing it to be used with multiple manifold types including Vici-Valco rotary valves. Figure 4. Ten months of measurements of a single tank. Hammer, S., Griffith, D. W. T., Konrad, G., Vardag, S., Caldow, C., and Levin, I.: Assessment of a multi-species in-situ FTIR for precise atmospheric greenhouse gas observations, Atmos. Meas. Tech., 6, 1153-1170, 10.5194/amtd-5-3645- 2012, 2013. APPLICATIONS The global carbon cycle is described as the exchange of carbon between the atmosphere, oceans and land surfaces. Currently the land surface and ocean sinks take up approximately 50% of the carbon released by human activities (such as fossil fuel burning). The question of whether this is a sustainable situation into the future accounts for the largest uncertainty in the carbon cycle.
SOIL FLUX CHAMBER MEASUREMENTS Land surface emissions are very important to measure, however, they are inhomogeneous and multiple measurements need to be performed to reach statistical confidence. A fully automated and remotely accessible system such as the Spectronus combined with a chamber system can help in such an application by optimising the number of samples collected. It also ensures a repeatable sampling protocol, crucial in such measurements. Integrate the Spectronus seamlessly with soil chambers for precise and reliable flux measurements. Remotely control valve manifolds and chambers via the Spectronus to setup sequences as well as control the opening and closing of the lids. Figure 5. Chamber measurements of soil carbon & isotope fluxes, Wombat State Forest, Australia* (Courtesy of Professor Stefan Arndt & Stephen Livesley, University of Melbourne). MICROMETEOROLOGICAL FLUX MEASUREMENTS Flux measurements can be performed in many different ways. The Spectronus is totally suitable for eddy accumulation measurements such as Relaxed or Disjunct Eddy Accumulation (REA/DEA) as well as tower gradient and profile measurements. Couple the Spectronus to a sonic anemometer and our lung system to measure N 2 O, CO 2 and CH 4 fluxes. The fully automated manifold will fill up, analyse and empty the bags for you. Figure 6. Sonic anemometer for REA measurements. * Fest, B. J., et al.: Soil methane oxidation in both dry and wet temperate eucalypt forests shows a near-identical relationship with soil air-filled porosity, Biogeosciences, 14, 467-479, 10.5194/bg-14-467-2017, 2017. * Phillips, R., et al.: Tracking shortterm effects of 15N addition on N2O fluxes using FTIR spectroscopy, J. Environ. Qual., 42, 1327-1340, 2013. ecotech.com | 5