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Professor John Pyle FRS

Portrait of jap12

Head of Department

My research involves the use of state-of-the-art numerical models, run on supercomputers, to study the processes controlling the present state of the atmosphere and its evolution. A NERC Unit, the Atmospheric Chemistry Modelling Support Unit, is incorporated into the group.

Current research activities include:

Stratospheric Modelling

The chemistry, dynamics and radiative transfer of the stratosphere are being studied using a number of numerical models. Three particular problems being tackled are (i) the rapid depletion of ozone found recently in the polar spring, the so-called 'ozone hole', (ii) the more gradual decline in northern hemisphere ozone levels (which we have recently ascribed partly to long-term changes in atmospheric flow, and (iii) the effect on stratospheric ozone of increasing concentrations of CO2, CH4, N2O and the chlorofluorocarbons.

Tropospheric Modelling

We have developed a range of models for studying the chemistry of the lower atmosphere, from complex 3D models to models based on air parcel trajectories. A major research theme is the changing oxidizing capacity of the troposphere (the ability of the troposphere to cleanse itself of pollution). An important part of our work includes involvement in field campaigns.

Chemistry/climate interactions

These interactions have become a major research topic in recent years. We have included a detailed chemistry package into the Met Office's climate model, to study composition change since the industrial revolution and into the future. We have calculated the change in surface ozone at the end of this century, under certain assumptions about changing industrial emissions. The change is very climate-dependent, but shows massive increases (which are expected to lead to major health problems) over some of the continents.

Atmospheric composition measurements

We have developed lightweight gas chromatography instruments to measure halocarbons. These have been deployed from balloons and high-flying research aircraft.

Many of the problems addressed are of an interdisciplinary nature. Members of the group, which numbers about 20 postdoctoral researchers and students, come from a wide range of backgrounds in mathematics and physical science. Within Cambridge we collaborate closely with scientists at the Department of Applied Mathematics and Theoretical Physics.


Characterisation of particle mass and number concentration on the east coast of the Malaysian Peninsula during the northeast monsoon
D Dominick, MT Latif, L Juneng, MF Khan, N Amil, MI Mead, MSM Nadzir, PS Moi, AA Samah, MJ Ashfold, WT Sturges, NRP Harris, AD Robinson, JA Pyle – Atmospheric Environment (2015) 117, 187
Night-time measurements of HOx during the RONOCO project and analysis of the sources of HO2
HM Walker, D Stone, T Ingham, S Vaughan, M Cain, RL Jones, OJ Kennedy, M McLeod, B Ouyang, J Pyle, S Bauguitte, B Bandy, G Forster, MJ Evans, JF Hamilton, JR Hopkins, JD Lee, AC Lewis, RT Lidster, S Punjabi, WT Morgan, DE Heard – Atmospheric Chemistry and Physics (2015) 15, 8179
Role of Chemistry in Earth's Climate
AR Ravishankara, Y Rudich, JA Pyle – Chem Rev (2015) 115, 3679
Sensitivity of tropical deep convection in global models: effects of horizontal resolution, surface constraints, and 3D atmospheric nudging
C Chemel, MR Russo, JS Hosking, PJ Telford, JA Pyle – Atmospheric Science Letters (2015) 16, 148
Rapid transport of East Asian pollution to the deep tropics
MJ Ashfold, JA Pyle, AD Robinson, E Meneguz, MSM Nadzir, SM Phang, AA Samah, S Ong, HE Ung, LK Peng, SE Yong, NRP Harris – Atmospheric Chemistry and Physics (2015) 15, 3565
The relative importance of methane sources and sinks over the Last Interglacial period and into the last glaciation
A Quiquet, AT Archibald, AD Friend, J Chappellaz, JG Levine, EJ Stone, PJ Telford, JA Pyle – Quaternary Science Reviews (2015) 112, 1
A large ozone-circulation feedback and its implications for global warming assessments
PJ Nowack, NL Abraham, AC Maycock, P Braesicke, JM Gregory, MM Joshi, A Osprey, JA Pyle – Nat Clim Chang (2015) 5, 41
Can seaweed farming in the tropics contribute to climate change through emission of short-lived halocarbons?
SM Phang, FSL Keng, MS Paramjeet-Kaur, YK Lim, NA Rahman, EC Leedham, AD Robinson, NRP Harris, JA Pyle, WT Sturges – Malaysian Journal of Science (2015) 34, 8
Influence of isoprene chemical mechanism on modelled changes in tropospheric ozone due to climate and land use over the 21st century
OJ Squire, AT Archibald, PT Griffiths, ME Jenkin, D Smith, JA Pyle – Atmospheric Chemistry and Physics (2015) 15, 5123
Quantifying the ozone and ultraviolet benefits already achieved by the Montreal Protocol.
MP Chipperfield, SS Dhomse, W Feng, RL McKenzie, GJ Velders, JA Pyle – Nature Communications (2015) 6, 7233
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Research Interest Groups

Telephone number

01223 336473