Prof. David Llewellyn-Jones

Picture of David Llewellyn-Jones

Primary Research Areas

David Llewellyn-Jones has been active in Space Research for over 25 years, in particlar, studying the Earth's surface from Space. Prior to that his research interests concerned the propagation of electromagnetic waves, particularly at millimetre, sumillimetre and infrared wavelengths, through the Earth's Atmopashere, together with the the assocoated spectroscopic problems.

He came to Leicester in 1993 to take up the new post of Professor of Earth Observation Science at the University of Leicester. He eestablished and built up the Leicester EOS activity in the form of an inter-disciplinary research group in the Space Research Centre, studying the Earth’s surface and its influence on the Earth's atmosphere and climate system, which has involved collaboration with colleagues in the departments of Chemistry and of Geography and other subjects including, of course, his own subject of Physics. 

After obtaining his first degree in Physics in UK, David Llewellyn-Jones obtained his PhD from the Massachusetts Institute of Technology in 1967, on 'Far Infrared Plasma Diagnostics'.  He then returned to the UK, where he worked in government research institutes including the Appleton Laboratory which, following a merger with the Rutherford High Energy Laboratory in 1980, became the Rutherford Appleton Laboratory (RAL, now STFC) becoming Head of the Remote Sensing Group (1980-1984) and Head of the Atmospheric Science Division (1984-1993) in RAL's Space Science Department.

During these periods,he worked on various aspects of atmospheric propagation of millimetre, submillimetre and infrared radiation, as well as related laboratory spectroscopy projects. Highlights of this period included, while working with H A Gebbie and Gary Gimmestad, new measurements of the shape of the molrcular oxygen absorption line at 120GHz using a development of the Untuned Cavity technique pioneered by Becker & Autler in 1946. Later, at rthe recently merged RAL, he initiated the design and constructiuon of the large multi-pass gas absorption cell, which is still used for measurements of of atmoipsheric absirption at NERC's Molecular Spectroscopy Facility (MSF) at the Rutherford Appleton Laboratory.

Since th e early 1980's he has had close involvement, as the initial proposer and the Principal Investigator, with the propsal for ATSR (The Along-Track Scanning Radiometer) for flight on a European Space Agency's planned ERS-1 satellite. ATSR was designed as an Experimental Instrument to measure Sea-surface temperature globally and very precisely from space. Now, nearly 18 years after the launch of ATSR-1, this continues to be an active and increasingly important programme with its third successive instrument, AATSR, still sending down high-quality data from ESA 's Envisat satellite, launched in 2002. The AATSR Engineering Model, built to the exact specifications of the Flight Model now in Space, can be seen, with its PI, in the picture above.

In 2002, David Llewellyn-Jones took partial retirement and was subsequently appointed to the positions of Professor Emeritus and University Fellow at the University of Leicester. He took retiremrnt on medical grounds on accont of failing central vision due to Macular Degeneration. Although this makes readuing paper text and recognising faces difficult (and sometimes embarassing!), he is an enthusiastic user of magnifying and reading software on his computer and his mobole phone. This technology, combined with relatively unimpaired peripheral vision, as well as some very patient and tolerant colleagues, enables him to continue with many of his duties.

Professor Llewellyn-Jones is still actively pursuing his research interests. These are primarilythose concerned with the use of AATSR and other satellite data to investigate climatically important geophysical processes, as well as the relationship between changes due to trends and natural variability .

His current responsibilities, of Principal Investigator for AATSR, are carried out under a contracvt to the University of Leicester from the UK Department for the Environment, Food and Rural Affairs (Defra) who are the main funding agency for the AATSR Instrument.

More information about The Along Track Scanning Radiometers (ATSR-1, ATSR-2 and AATSR) can be found by investigating the links given towards the foot of this page.

 

Selected Publications and Presentations

Selected Space-Related Publications in Refereed Journals,  November 2007


1.    Harries, J.E., Llewellyn-Jones, D.T., Minnett, P.J., Saunders, R.W. and Zavody, A.M.,  Observations of sea-surface temperature for climate research. Phil. Trans. Royal Soc. London, 309, 381-395., 1983.
2.    Llewellyn-Jones, D.T., Minnett, P.J., Saunders, R.W, et al., satellite multichannel infrared measurements of sea-surface temperature of the ne atlantic-ocean using avhrr 2, Quart. J. Roy. Meteor. Soc., 110 (465): 613-631 1984.
3.    Barton, I.J., Zavody, A.M., O'Brien, D.M., Cutten, D.R., Saunders, R.W. and Llewellyn-Jones, D.T., Theoretical algorithms for satellite-derived sea-surface temperatures. J. Geophys. Res. - Atmos., 94, D3 3365-3375., 1989.
4.    Prata, A.J., Cechet, R.P., Barton, I.J. and Llewellyn-Jones, D.T., The along track scanning radiometer for ERS-1 - Scan geometry and data simulation. IEEE Trans. Geosci. Rem. Sens., 28, 3-13, 1990.
5.    Barton, I.J., Prata, A.J, and Llewellyn-Jones, D.T., The Along Track Scanning Radiometer - an analysis of coincident ship and satellite measurements. Adv.in Space Res., 13, 69-74., 1993.
6.    Allen, M.R., Mutlow, C.T., Blumberg, G.M.C., Christy, J.R., McNider, R.T. and Llewellyn-Jones, D.T., Global change detection. Nature 370, 24-25., 1994.
7.    Mutlow, C.T., Zavody, A.M., Barton, I.J. and Llewellyn-Jones, D.T., Sea-surface temperature-measurements by the Along-Track Scanning Radiometer on the ERS-1 Satellite - early results, J. of Geophysical Research-Oceans, 99, No.C11, 22575-22588, 1994.
8.    Allen, M.R., Lawrence, S.P., Murray, M.J., Mutlow, C.T., Stockdale, T.N. Llewellyn-Jones, D.T. and Anderson, D.L.T., Control of Tropical Instability Waves in the Pacific, Geophys. Res. Lett., 22, No.19, 2581-2584, 1995.
9.    Watts, P.D., Zavody, A.M., Mutlow, C.T., Barton, I.J., Minnett, P.J. and Llewellyn-Jones, D.T., Effect of surface wind-speed and sensor view zenith angle dependence of emissivity on SST retrieval from thermal infrared data - ATSR - comment, Int. J. of Remote Sensing, 16, No.11, 2099-2103, 1995.
10. Zavody, A.M., Mutlow, C.T. and Llewellyn-Jones, D.T., A radiative-transfer model for sea-surface temperature retrieval for the Along-Track Scanning Radiometer Journal of Geophysical Research-Oceans, 100, No.C1, 937-952, 1995.
11. Xue, Y., Lawrence, S.P., Llewellyn-Jones, D.T., et al., On the Earth's surface energy exchange determination from ERS satellite ATSR data. Part I: Long-wave radiation, Int. J. of Remote Sensing, 19 (13): 2561-2583 SEP 10 1998.
12. Parkes, I.M., Sheasby, T.N., Llewellyn-Jones, D.T., et al., The Mutsu Bay Experiment: validation of ATSR-1 and ATSR-2 sea surface temperature, Int. J. of Remote Sensing, 21 (18): 3445-3460 DEC 2000.
13. Xue, Y., Llewellyn-Jones, D.T., Lawrence, S.P., et al., On the Earth's surface energy exchange determination from ERS satellite ATSR data: Part 2. Short-wave radiation, Int. J. of Remote Sensing, 21 (18): 3415-3426 DEC 2000.
14. Xue, Y., Llewellyn-Jones, D.T., Lawrence, S.P., et al., On the Earth's surface energy exchange determination from ERS satellite ATSR data: Part 3. Turbulent heat flux on open sea, Int. J. of Remote Sensing, 21 (18): 3427-3444 DEC 2000.
15. Zavody, A.M., Mutlow, C.T., Llewellyn-Jones, D.T., Cloud clearing over the ocean in the processing of data from the along-track scanning radiometer (ATSR), J. of Atmos. Ocean. Technol., 17 (5): 595-615 MAY 2000.
16. Angell. J. P., Lawrence, S.P. and Llewellyn-Jones; Journal of Advanced Marine Science and Technology Society, 4, pp 191-196 (1998)
17. Rathman, W.P., Llewellyn-Jones, D.T. and Monks P.S.; A preliminary comparison between TOVS and GOME level-2 ozone data, Geophysical Research Letters, 24, pp 2191-2194
18. GODIVA, a European project for ozone and trace gas measurements from GOME; Goede APH, Tanzi, C.P.,Burrows, J.P., Llewellyn-Jones et al (12others), Advances in Remote Sensing of the Atmosphere From Space And from the Ground, 26, pp 951-954 (2000)
19. Lawrence, S. P., D. T. Llewellyn-Jones, and S. J. Smith (2004), The measurement of climate change using data from the Advanced Very High Resolution and Along Track Scanning Radiometers, J. Geophys. Res., 109, doi: 10.1029/2003JC002104.
20. Harries, J. E., J. E. Russell, J. A. Hanafin, H. Brindley, J. Futyan, J. Rufus, S. Kellock, G. Matthews, R. Wrigley, A. Last, J. Mueller, R. Mossavati, J. Ashmall, E. Sawyer, D. Parker, M. Caldwell, P. M. Allan, A. Smith, M. J. Bates, B. Coan, B. C. Stewart, D. R. Lepine, L. A. Cornwall, D. R. Corney, M. J. Ricketts, D. Drummond, D. Smart, R. Cutler, S. Dewitte, N. Clerbaux, L. Gonzales, A. Ipe, C. Bertrand, A. Joukoff, D. Crommelynck, N. Nelms, D. T. Llewellyn-Jones, G. Butcher, G. L. Smith, P. Szewczyk, P. E. Mlynczak, A. Slingo, R. P. Allan, and M. A. Ringer, The Geostationary Earth Radiation Budget Project, BAMS, 945-960 (2005).
21. Corlett, G. K., I. J. Barton, C. J. Donlon, M. C. Edwards, S. A. Good, L. A. Horrocks, D. T. Llewellyn-Jones, C. J. Merchant, P. J. Minnett, T. J. Nightingale, E. J. Noyes, A. G. O'Carroll, J. J. Remedios, I. S. Robinson, R. W. Saunders, and J. G. Watts (2006), The accuracy of SST retrievals from the AATSR: an initial assessment through geophysical validation against in situ radiometers, buoys and other SST data sets, Advances in Space Research, 37, 764-769 (2006).
22. Noyes, E. J., P. Minnett, J. J. Remedios, G. K. Corlett, S. A. Good, and D. T. Llewellyn-Jones (2006), The Accuracy of the AATSR Sea Surface Temperatures in the Caribbean, Remote Sensing of Environment, 101, 38-51. (2006)
23. Noyes, E. J., G. Soria, J. A. Sobrino, J. J. Remedios, DTLlewellyn-Jones, G. K. Corlett, “AATSR Land Surface temperature product Verification over a WATERMED Site”, Advances in Space Research 39 (1) 171-178 (2007)
24. Good, S.A., G.K. Corlett, J.J. Remedios, E.J. Noyes, and D.T. Llewellyn-Jones, The global trend in sea surface temperature from 20 years of Advanced Very High Resolution Radiometer data, Journal of Climate, 20, no.7, 1255-1264, (2007).
25. C. Donlon, I. Robinson, K. S. Casey, J. Vazquez-Cuervo, E. Armstrong,  O. Arino, C. Gentemann, D. May, P. Leborgne, J. Piollé, I. Barton,
26. H. Beggs, D. J. S. Poulter, C. J. Merchant, A. Bingham, S. Heinz, A. Harris, G. Wick, B. Emery, P. Minnett, R. Evans, D. Llewellyn-Jones, C. Mutlow, R. W. Reynolds, H. Kawamura, And N. Rayner. "The Global Ocean Data Assimilation Experiment (GODAE) High Resolution Sea Surface Temperature Pilot Project (GHRSST-PP)." Bulletin of the American Meteorological Society, 88(8), 1197-1213, (2007).


Links to related work


AATSR
ATSR 1 and 2
ESA-ENVISAT
GHRSST

GERB

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