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Department of Chemistry

 

What I do

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.

Publications

Using machine learning to build temperature-based ozone parameterizations for climate sensitivity simulations
P Nowack, P Braesicke, J Haigh, NL Abraham, J Pyle, A Voulgarakis
– Environmental Research Letters
(2018)
13,
ARTN 104016
Quasi-Newton methods for atmospheric chemistry simulations: implementation in UKCA UM vn10.8
E Esentürk, N Luke Abraham, S Archer-Nicholls, C Mitsakou, P Griffiths, A Archibald, J Pyle
– Geoscientific Model Development
(2018)
11,
3089
Estimates of ozone return dates from Chemistry-Climate Model Initiative simulations
SS Dhomse, D Kinnison, MP Chipperfield, RJ Salawitch, I Cionni, MI Hegglin, NL Abraham, H Akiyoshi, AT Archibald, EM Bednarz, S Bekki, P Braesicke, N Butchart, M Dameris, M Deushi, S Frith, SC Hardiman, B Hassler, LW Horowitz, RM Hu, P Jöckel, B Josse, O Kirner, S Kremser, U Langematz, J Lewis, M Marchand, M Lin, E Mancini, V Marécal, M Michou, O Morgenstern, FM O'Connor, L Oman, G Pitari, DA Plummer, JA Pyle, LE Revell, E Rozanov, R Schofield, A Stenke, K Stone, K Sudo, S Tilmes, D Visioni, Y Yamashita, G Zeng
– Atmospheric Chemistry and Physics
(2018)
18,
8409
On ozone trend detection: Using coupled chemistry-climate simulations to investigate early signs of total column ozone recovery
J Keeble, H Brown, NL Abraham, NRP Harris, JA Pyle
– Atmospheric Chemistry and Physics
(2018)
18,
7625
Global modelling of the total OH reactivity: Investigations on the "missing" OH sink and its atmospheric implications
V Ferracci, I Heimann, N Luke Abraham, JA Pyle, AT Archibald
– Atmospheric Chemistry and Physics
(2018)
18,
7109
The Impact of Stratospheric Ozone Feedbacks on Climate Sensitivity Estimates
PJ Nowack, NL Abraham, P Braesicke, JA Pyle
– Journal of Geophysical Research - Atmospheres
(2018)
123,
4630
Flow rate and source reservoir identification from airborne chemical sampling of the uncontrolled Elgin platform gas release
JD Lee, SD Mobbs, A Wellpott, G Allen, SJB Bauguitte, RR Burton, R Camilli, H Coe, RE Fisher, JL France, M Gallagher, JR Hopkins, M Lanoiselle, AC Lewis, D Lowry, EG Nisbet, RM Purvis, S O'Shea, JA Pyle, TB Ryerson
– Atmospheric Measurement Techniques
(2018)
11,
1725
The Quadrennial Ozone Symposium 2016 (vol 34, pg 368, 2017)
S Godin-Beekmann, I Petropavlovskikh, S Reis, P Newman, W Steinbrecht, M Rex, ML Santee, RS Eckman, X Zheng, MB Tully, DS Stevenson, P Young, J Pyle, M Weber, J Tamminen, G Mills, AF Bais, C Heaviside, C Zerefos
– Advances in Atmospheric Sciences
(2018)
35,
368
Chemical and climatic drivers of radiative forcing due to changes in stratospheric and tropospheric ozone over the 21st century
A Banerjee, AC Maycock, JA Pyle
– Atmospheric Chemistry and Physics
(2018)
18,
2899
Diagnosing the radiative and chemical contributions to future changes in tropical column ozone with the UM-UKCA chemistry–climate model
J Keeble, EM Bednarz, A Banerjee, N Luke Abraham, NRP Harris, AC Maycock, JA Pyle
– Atmospheric Chemistry and Physics
(2017)
17,
13801
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Research Group

Research Interest Groups

Telephone number

01223 336473