My specialist areas are in boundary layer meterology; land-surface-atmosphere interactions; footprint modelling; greenhouse gas fluxes.

Research Interests:

My research focuses on interactions of the terrestrial biosphere and the lower atmosphere.

(i) Footprint/source-area modelling based on a backward Lagrangian particle dispersion model to determine the upwind surface area of influence for an atmospheric flux or concentration measurement.

Online footprint estimate: Calculate a footprint using a simple parameterisation (http://footprint.kljun.net/).

(ii) Vegetation - atmosphere carbon and water vapour exchange: processes controlling and influencing the carbon and water balances

(iii) Upscaling of local greenhouse gas flux measurements to a regional or continental scale, taking into account heterogeneous surfaces, complex terrain, and issues in spatial and temporal resolution

Areas of Expertise

  • Biosphere/atmosphere interactions
  • Footprint modelling
  • Boundary layer meterology
  • Greenhouse gas fluxes

Publications

  1. & Technical note: Dynamic INtegrated Gap-filling and partitioning for OzFlux (DINGO). Biogeosciences 14(6), 1457-1460.
  2. & Estimating Canopy Gap Fraction Using ICESat GLAS within Australian Forest Ecosystems. Remote Sensing 9(1), 59
  3. & Air-sea gas transfer in high Arctic fjords. Geophysical Research Letters 44, 2519-2526.
  4. & Direct and indirect climate change effects on carbon dioxide fluxes in a thawing boreal forest-wetland landscape. Global Change Biology 23(8), 3231-3248.
  5. & Using High Resolution LiDAR Data and a Flux Footprint Parameterization to Scale Evapotranspiration Estimates to Lower Pixel Resolutions. Canadian Journal of Remote Sensing 43, 215-229.
  6. & The positive net radiative greenhouse gas forcing of increasing methane emissions from a thawing boreal forest-wetland landscape. Global Change Biology 23(6), 2413-2427.
  7. & Estimating forest canopy parameters from satellite waveform LiDAR by inversion of the FLIGHT three-dimensional radiative transfer model. Remote Sensing of Environment 188, 177-189.

See more...

Teaching

  • GEB301 Interdisciplinary Field Course to the Indian Himalayas (Sikkim)

    This residential field course module explores the relationship between environment and society in the Himalayan state of Sikkim in NE India on the borders with China, Nepal, Tibet and West Bengal. The course is inter-disciplinary in approach and policy-oriented. Students work with members of University Staff in mixed groups of biologists, human geographers, physical geographers and zoologists. Through intensive inter-disciplinary group working students utilise (and pass on) their specialist skills in the group exercises and projects that are undertaken.

  • GEG101 Earth in Action

    This module introduces the three main Earth systems: the geosphere,atmosphere and biosphere. A sound understanding of the processes within each system, and of the interactions between them, forms the essential foundation for any more advanced study of physical geography. The geosphere section deals with the origin of Earth, describes the distribution of different rock types and introduces the concept of plate tectonics. The atmosphere section deals with flows of energy and moisture and their role in controlling climate over both space and time. The biosphere section deals mainly with flows of energy and nutrients and focuses on the way that life on Earth interacts with the other Earth systems.

  • GEG264A Environmental Research Methods A

    The module covers research project design, data collection and some aspects of data analysis. Students are introduced to a range of laboratory and field techniques in physical geography. They gain experience in describing and interpreting results derived from laboratory techniques concerned with reconstructing the depositional history of sediments, chemical analysis of water and sediment from a variety of sources and the simulation of geomorphological processes.

  • GEG268 Dissertation Preparation

    The module prepares students for their independent research dissertation through dissertation fairs, lectures and a series of tutorials focusing upon the formulation and construction of a research proposal. The module also includes three lectures which explore career opportunities for Geography graduates and skills to enhance graduate employability.

  • GEG331 Dissertation Report: Geography

    The dissertation is an original, substantive and independent research project in an aspect of Geography. It is typically based on approximately 20 - 25 days of primary research and several weeks of analysis and write-up. The end result must be less than 10,000 words of text. The dissertation offers you the chance to follow your personal interests and to demonstrate your capabilities as a Geographer. During the course of your dissertation you will be supported by a student-led discussion group and a staff supervisor, and you will also provide constructive criticism to fellow students undertaking related research projects, learning from their research problems and subsequent solutions. This support and supervision is delivered through the 'Dissertation Support' module, which is a co-requisite.

  • GEG332 Dissertation Support: Geography

    This module provides structured, student-led peer-group support and academic staff group supervision for students undertaking the 30-credit 'Dissertation Report: Geography' module. This support and supervision is assessed through the submission of a PowerPoint Poster in TB1 and the submission in TB2 of an individually composed, critical and reflective log of the 5 dissertation peer-group meetings and the 4 group supervisory meetings (with a verified record of attendance at meetings). Working within a supervised Student Peer Group, you will also have the opportunity to provide constructive criticism to fellow students undertaking related research projects, learning from their research problems and subsequent solutions. This module complements the 'Dissertation Report: Geography' module, which is a co-requisite.

  • GEG347 Meteorology and Atmospheric Science

    This module provides a comprehensive introduction to meteorology, weather, and atmospheric science. The emphasis is on the applied aspect of meteorology. However, as understanding of these is based on physical concepts, an excellent mathematical qualification (GCSE level) and physical background is a pre-requisite for a student attending this module. The module focuses on short timescales ranging from daily to seasonal. Meteorology is introduced as the study of weather and related phenomena. Methods of measuring the atmosphere and the interpretation of these measurements are fundamental to the subject, as are classifications and qualitative descriptions of atmospheric phenomena. The fundamental physics of the atmosphere (motion, moisture and radiation) are discussed. The central part of the module focuses on weather systems, both in the tropics and the mid-latitudes. Finally, the module covers small-scale phenomena (e.g. tornadoes), and boundary-layer processes. Weather forecasting is a theme which runs through the module, as much of the research in meteorology has been motivated by the desire to predict the weather. The relationship between measurements, models and forecasts is explored.

Supervision

  • GREEN GAP: GREENhouse Gas flux uPscaling - improved understanding of key ecosystem processes using remote sensing and ground-based measurements. (current)

    Student name:
    PhD
    Other supervisor: Dr Rita Borgo
    Other supervisor: Dr Xianghua Xie
    Other supervisor: Dr Jacqueline Rosette
  • Developing a Source Area Model Toolbox for Accelerated Simulations on Graphic Cards (current)

    Student name:
    PhD
    Other supervisor: Dr Benjamin Mora

Career History

Start Date End Date Position Held Location
2016 Present Professor Swansea University
2013 2016 Associate Professor (Reader) Swansea University
2013 2014 Visiting Professor, LUCCI Lund University, Sweden
2012 2012 Distinguished Visiting Scientist, CSIRO/CMAR Canberra, Australia
2007 2013 Senior Lecturer Swansea University
2004 2007 Research Associate, INFRAS, Consulting Berne, Switzerland
2004 2007 Postdoctoral Fellow ETH Zurich, Switzerland
2002 2003 Postdoctoral Fellow, University of British Columbia Vancouver, Canada
1998 2002 PhD in Natural Sciences (Dr sc nat) ETH Zurich, Switzerland

Administrative Responsibilities

  • Departmental Admission Tutor for Postgraduate Research - Department of Geography

    2012 - Present

  • Member - NERC Peer Review College

    2010 - Present

  • Member - College of Reviewers, Canada Research Chairs

    2007 - Present

  • School's representative - Collaborative Provision Committee of Swansea University

    2009 - 2012

  • Coordinator - School's exchange students

    2007 - 2012

  • School's academic staff representative - Human Resources Committee

    2008 - 2011

  • School's representative - Athena Swan

    2009 - 2009

Research Groups

  • GEMEO

    The group has extensive experience in analysis of remote sensing data for land-surface and climate change detection, and biogeochemical modelling (e.g., UK Met Office land surface model JULES) and command excellent links to the FLUXNET community. The group has active collaborations with NASA, the MODIS team, ESA and UK space industry.