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Night-time chemistry above London: measurements of NO3 and N2O5 from the BT Tower
Atmospheric Chemistry and Physics
Broadband cavity enhanced absorption spectroscopy (BBCEAS) has been used to measure the sum of concentrations of NO 3 and N 2 O 5 from the BT (telecommunications) Tower 160 m above street level in central London during the REPARTEE II campaign in October and November 2007. Substantial variability was observed in these 5 night-time nitrogen compounds: peak NO 3 +N 2 O 5 mixing ratios reached 800 pptv, whereas the mean night-time NO 3 +N 2 O 5 was approximately 30 pptv. Additionally, [NO 3 +N 2 Odoi:10.5194/acp-10-9781-2010 fatcat:u2ythe5bsfeida37g4kyjohnru