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Daoxi Zhang UCL-MSSL Homepage

daz

Daoxi Zhang

Imaging Group

PhD Student

Tel: +44 (0)1483 204 901

Fax: +44 (0)1483 278 312

Internal: 4901

Email: daz {at} mssl.ucl.ac.uk; daoxi.zhang10{at}ucl.ac.uk

Room: Boyd Centre, Room E

Research Interests

  • Ocean Color Remote Sensing
  • Chlorophyll retrieve for optically complex waters
  • Influence of environment on phytoplankton bloom dynamics

Qualifications

  • B.Sc. Electronic Engineering, Huazhong Normal University
  • M.Sc. Remote Sensing, Wuhan University
  • Ph.D. University College London (in progress)

Project

"Using the MERIS red and near-infrared data to retrieve chlorophyll-a content of cyanobacterial colonies in the optically complex waters (i.e. the Baltic Sea) and the potential driving forces for the formation of cyanobacterial blooms."

Supervisors: Prof. Jan-Peter Muller, Dr. Dave Walton, Dr. Samantha Lavender

Annually occurring cyanobacterial blooms in the Baltic Sea have posed severe threat to the Baltic ecosystem and local environment. The associated consequences in both healthy risk to human and domestic animals and, economic losses to local fishery and recreational industries. Therefore, it is essential that routinely monitoring programmes are available for this ecologically and economically significant area. Pioneering studies have demonstrated that both field campaigns and water sampling programmes from a few fixed referencing stations were insufficient to reflect the dynamics of cyanobacterial communities, especially during the period when the blooms were occurring. Satellite remote sensing being an efficient and cost effective tool provides cohesive coverage of global waters on a nearly daily basis. However, as to the optically complex CaseII waters (e.g. the Baltic Sea), other optically active constituents such as yellow substance and suspended matter in water have non-negligible effects on observed water leaving signal in the blue and green region, which have made traditional blue-green band ratio algorithms are not reliable or not applicable to these waters on retrieval chlorophyll concentration of cyanobacterial communities.

In the red and NIR region, where other water constituents have minor influence on water leaving signal, chlorophyll-a have several spectral features that are observable using ocean colour sensors (e.g. the MERIS). These distinct features of chlorophyll located in the red and NIR region allow us to assess chlorophyll concentration of cyanobacteria in CaseII waters accurately. After developing an effective algorithm to retrieve chlorophyll, studying of the potential driving of cyanobacterial blooms is another topic that we will be working on.

Publications

  • Zhang D., Muller J-P., Lavender S., Walton D., Dartnell L.R., (2012), Fluorescent analysis of photosynthetic microbes and Polycyclic Aromatic Hydrocarbons linked to optical remote sensing, Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci., XXXIX-B8, 555-559

Outreach

Activities

2013

  • International Ocean Colour Science meeting (May)
  • RSPSoc Annual Student Meeting (ASM) (March)

2012

  • Nordic Network for Baltic Remote Sensing (October-November)
  • XXII International Society for Photogrammetry & Remote Sensing Congress (ASM) (August-September)
  • IEEE International Geoscience and Remote Sensing Symposium (IGARSS) (August)
  • Fieldwork at Askö Laboratory (July-August)
  • RSPSoc Annual Student Meeting (ASM) (March)

2011

  • Human Spaceflight and Exploration Summer School, Sweden (August)
  • RSPSoc Annual Student Meeting (ASM) (March)

2010

  • CEOI Detector Technologies challenge Workshop (November)

Conference Talks

2013

  • Using MERIS fluorescence data to map cyanobacterial blooms in the Baltic Sea, D.Zhang, S.Lavender, B.Karlson, J.P.Muller,Remote Sensing and Photogrammetry Society (RSPSoc) Annual Student Meeting, Glasgow, United Kingdom. 11–13 March, 2013

2012

  • Fluorescent analysis of photosynthetic microbes and Polycyclic Aromatic Hydrocarbons linked to optical remote sensing, Zhang D., Muller J-P., Lavender S., Walton D., Dartnell L.R., ISPRS, Melbourne, Australia. 25 Aug.–01 Sep. 2012
  • Primary results of using chlorophyll fluorescence to detect cyanobacterial blooms in the Baltic Sea,D.Zhang, J.P.Muller, S.Lavender, Remote Sensing and Photogrammetry Society (RSPSoc) Annual Student Meeting, Falmouth, Cornwall, United Kingdom. 12–14 March, 2012.

Affiliations

Awards

Poster Prize @ Mullard Space Science Lab, University College London, 02/2011 - Understanding the potential and limitations of solar-induced fluorescent imaging of cyanobacteria in oceans

  • MERIS
  • OCEAN COLOUR
  • MODIS
  • RSPSoc

One fact about me...

Page last modified on 14 jun 13 14:55