2 University of Manchester, School of Physics, Manchester, UK. 3 Centre for ... Weekday Diurnal Statistics and Size Distributions. Cluster 1. (non-PB. A. ).
UH
Gallagher, M.W.1, Crawford, I.1, Malkinson, J.L.2, Gadjourova, M.6, Daniel, C.D.2, Kaye, P.A.3, Foot, V.4, Baumgardner, D.5
1 Centre for Atmospheric Science, University of Manchester, UK 2 University of Manchester, School of Physics, Manchester, UK 3 Centre for Atmospheric & Instrumentation Research, University of Hertfordshire, UK 4 DSTL, Porton Down, Salisbury, Wiltshire, SP4 0JQ, UK 5 Droplet Measurement Technologies, Boulder, Co. USA 7 University of Manchester, School of Earth & Environment, Manchester, UK
Site – University Place, UoM Multifunctional communal building located on south campus • • • • • • • •
Lecture halls Student services Catering Visitor centre 26 meeting rooms (capacity 18-1000 occupants) 25 seminar rooms (capacity 16-180 occupants) Restaurant with seating for 400 500 m2 exhibition hall
Weekend
Weekend
Strong diurnal cycles occur during weekdays Peak concentrations observed at midday Night time minima (~500 L-1) much less than measured outside (1000-4000 L-1) Weekend concentrations, cycle depressed
Enhancement in fluorescence due to human activity
What is this fluorescent material?
Cluster 2 (spores)
Broadening of size distribution
Cluster 3 (bacteria) Cluster 1 (non-PBA)
Weekday Diurnal Statistics and Size Distributions
Enhancement of number concentration
Cluster 3 (bacteria+anthrop)
Cluster 2 (spores)
Cluster 1 (non-PBA)
Weekday Diurnal Statistics and Size Distributions
Very few particles present at night
Cluster 2 (spores)
Cluster 1 (non-PBA)
Key points: Large fluorescent (likely PBA) particles are present in the buildings indoor atmosphere through the working day. Peak concentrations at noon coinciding with heavy huma activity/ use. Clusters with very large size and aspect ratio may be cellulose material associated with fibrous material (lab tests to confirm).
Emission processes within the building? Cluster 3 (bacteria+anthrop)
Weekday Diurnal Statistics and Size Distributions
Cluster 2 (spores) Cluster 1 (non-PBA)
Little human activity No diurnal trend Number concentration significantly lower
Cluster 3 (bacteria+2nd minor anthrop cluster?)
Weekend Diurnal Statistics and Size Distributions
Peaks in fluorescent concentration only until noon - No student lectures in afternoon
Wednesday Tuesday
Peaks in fluorescent concentration superimposed on diurnal trend on the hour throughout working day
Short time scale variation 2012
Tuesday
Cyclic nature of emission peaks characteristic of University Place/Hourly Lecture Theatre Activity
Wednesday
Key Short time scale variations Highlighted
University Place – Daily Indoor Cycles – Another Experiment 2014
Bioaerosol Fluxes in University Place – Weekend Patterns are Very Different to Weekdays due to reduction in Human Activity HAC/ABC contribution breakdown e.g.
Indoor horizontal particle flux Fn(Fl) (# m-2 s-1) with respect to direction and primary source features in University Place. Based on correlation with sonic anemometer data.
University Place – Diurnal Indoor Cycles. Clear difference between teaching days (total and Fl) and weekend plus hourly peaks as in previous reports
University Place – Average Diurnal Indoor Cycles Hourly Peaks do not show up on the average diurnal cycle illustrating the need for better resolution to inform human exposure calculations
University Place – Weekend Patterns are Very Different to Weekday due to reduction in Human Activity
Undergraduate Student Projects in Biometeorology - 2012 using UVLIF Sensors to Capture Working Environment/Indoor Bioaerosol Source Variation
