Week 6: A shorter post during break

This week research continues besides enjoying the short break. I received a new set of mass spectrometric (MS) data, as is shown in the following figures. What is interested about these data is that they are collected online, rather than offline like the data I’ve analyzed in the past weeks. With “online”, we mean that the data is collected live on the field in real time. By contrast, offline data are obtained in laboratory with prepared samples collected in the field.


The first figure shows a typical time series for the current MS data sets. Those sets of online MS data, mainly used for studying biomass burning aerosols, are collected fumes emitted from burnings of different kinds of fuels in a controlled environment. What is interested about those data is that the mass spectrum of the aerosols emitted from individual kind of fuels has its distinct feature. Take the following two pictures as examples. The first picture is the online mass spectrum for a burning of general pieces of Douglas Fir, while the second spectrum is for a burning of rotten logs of Douglas Fir. Notice that the spectrum for rotten logs has a lower intensity for most ion species except CHO+ (indicates alcoholic species), and C2H4O2+ (indicates bio-source saccharides).

doug_fir   r_doug_fir

Researching on the implication for such differences between the spectra will be my focus for next week after the holiday weekend. Hopefully you guys all enjoy your breaks and happy back for the research!