311 Craig Mair 
School of Ocean Sciences
Bangor University, Wales
Menai Bridge LL59 5AB
UK
 
tel:+44 1248388658
e-mail:y.lenn AT bangor.ac.uk
 
I am a polar physical oceanographer and my interests lie in understanding the physical processes integral to ocean overturning that impact climate in the polar oceans. My Southern Ocean research has focused on Drake Passage eddy heat and momentum fluxes, the surface Ekman layer that constitute the upper limb of the overturning circulation, and diapycnal mixing driving water mass transformation in the thermocline at the Antarctic continental slope. My Arctic research focuses on water mass transformations occurring in the continental shelf seas and along the Arctic continental slope that link the Arctic to the global overturning circulation, most recently investigating the role of different mixing mechanisms (i.e. double diffusion and turbulent mixing drive by tides or winds) in fluxing heat and other properties from the warm Atlantic Water into overlying Arctic halocline and mixed layer.   
 
I am also the schools liason for the School of Ocean Sciences, co-ordinating most school visits to Ocean Sciences by schools as well as providing support for colleagues who visit schools.  Other outreach events I support include school STEM Careers Fairs and other Science Fairs.  These activities include events organised in partnership with STEMCymru and other similar organisations seeking to promote STEM in Wales and beyond. 
 
Research Area:
 
  • PhD: Observations of Antarctic Circumpolar Current Dynamics and Small-scale variability near the Antarctic peninsula
    Scripps Institution of Oceanography, La Jolla, 2006
  • MSc: Medical Radiation Physics
    University College London, 1998
  • MA: EXPERIMENTAL AND THEORETICAL PHYSICS
    Cambridge University, 1997

PhD students: Will Stewart, Bangor University (from September 2022)

Recent Phd Students:  Ben Barton, Universite de Bretagne Occidentale &. Jess Mead Silvester, Bangor University

Current modules:

ONS1001: Environmental Data & Analysis

DXX1005:  Earth Systems & Processes

OSX1005: Introducing the Oceans

OSX2005:  Earth and Ocean Observation

OSX2006: TIdes, Waves & Sampling

OSX3002:  Marine Ecosystems & Processes

OSX4010: Key Concepts & Techniques

OSX4012:  Practical Oceanography

OSX4015: Climate & Climate Change

OSX4408: Field and Lab Oceanography

The PhD projects I propose usually stem from my current research interests and focus mainly on processes that drive fluxes of heat, freshwater and momentum within the polar ocean and between the ocean, cryosphere and atmosphere.  Past students have studied how tidal forcing drives vertical fluxes of heat from Upper Circumpolar Deep Water into the surrounding colder fresher Antarctic-source waters along the Antarctic Peninsular continental slope, as welll as how warm Atlantic Water is contributing to sea ice loss in the Arctic Barents Sea.  I have also supervised projects studying wind-driven mixing at the base of the open ocean mixed-layer and the role of wind-forcing in driving Arctic mixing. 

2024

2022

2021

  • Published30-Second Oceans
    Lenn, Y.-D. (Editor) & Green, M. (Editor), 21 Mar 2021, The Ivy Press. 160 p. (30-Second....)
    Research output: Book/Report › Book
  • PublishedA warm Jet in a cold ocean
    MacKinnon, J., Lenn, Y.-D., Simmons, H. L., Hargrove, J., Thomson, J., Peacock, T., Alford, M. H., Barton, B. I., Boury, S., Brenner, S. D., Couto, N., Danielson, S. L., Fine, E. C., Graber, H. C., Guthrie, J., Hopkins, J. E., Jayne, S. R., Jeon, C., Klenz, T. & Lee, C. M. & 9 others, Lucas, A. J., Lund, B., Mahaffey, C., Norman, L., Rainville, L., Smith, M. M., Thomas, L. N., Torres-Valdes, S. & Wood, K. R., 23 Apr 2021, In: Nature Communications. 12, 1, p. 2418
    Research output: Contribution to journal › Article › peer-review
  • PublishedMixing in the Arctic Ocean
    Lenn, Y.-D., Fer, I., Timmermans, M.-L. & MacKinnon, J. A., 5 Oct 2021, Ocean Mixing: Drivers, Mechanisms, Impacts. Meredith, M. & Garabato, A. (eds.). Elsevier, p. 275-299
    Research output: Chapter in Book/Report/Conference proceeding › Chapter › peer-review
  • PublishedOn the Along-Slope Heat Loss of the Boundary Current in the Eastern Arctic Ocean
    Schulz, K., Janout, M. A., Lenn, Y.-D., Castillo, E. R., Polyakov, I., Mohrholz, V., Tippenhauer, S., Reeve, K., Holemann, J., Rabe, B. & Vredenborg, M., Feb 2021, In: Journal of Geophysical Research: Oceans. 126, 2, e2020JC016375.
    Research output: Contribution to journal › Article › peer-review

2020

2019

  • PublishedEastern Arctic Ocean diapycnal heat fluxes through large double-diffusive steps
    Polyakov, I. V., Padman, L., Lenn, Y.-D., Pnyushkov, A., Rember, R. & Ivanov, V. V., 4 Jan 2019, In: Journal of Physical Oceanography. 49, 1, p. 227-246
    Research output: Contribution to journal › Article › peer-review
  • PublishedOn the Future of Argo: A Global, Full-Depth, Multi-Disciplinary Array
    Roemmich, D., Alford, M. H., Claustre, H., Johnson, K., King, B., Moum, J., Oke, P., Owens, W. B., Pouliquen, S., Purkey, S., Scanderbeg, M., Suga, T., Wijffels, S., Zilberman, N., Bakker, D., Baringer, M., Belbeoch, M., Bittig, H. C., Boss, E. & Calil, P. & 60 others, Carse, F., Carval, T., Chai, F., Conchubhair, D. Ó., d’Ortenzio, F., Dall’Olmo, G., Desbruyeres, D., Fennel, K., Fer, I., Ferrari, R., Forget, G., Freeland, H., Fujiki, T., Gehlen, M., Greenan, B., Hallberg, R., Hibiya, T., Hosoda, S., Jayne, S., Jochum, M., Johnson, G. C., Kang, K., Kolodziejczyk, N., Körtzinger, A., Traon, P.-Y. L., Lenn, Y.-D., Maze, G., Mork, K. A., Morris, T., Nagai, T., Nash, J., Garabato, A. N., Olsen, A., Pattabhi, R. R., Prakash, S., Riser, S., Schmechtig, C., Schmid, C., Shroyer, E., Sterl, A., Sutton, P., Talley, L., Tanhua, T., Thierry, V., Thomalla, S., Toole, J., Troisi, A., Trull, T. W., Turton, J., Velez-Belchi, P. J., Walczowski, W., Wang, H., Wanninkhof, R., Waterhouse, A. F., Waterman, S., Watson, A., Wilson, C., Wong, A. P. S., Xu, J. & Yasuda, I., 2 Aug 2019, In: Frontiers in Marine Science. 6, 439
    Research output: Contribution to journal › Article › peer-review
  • PublishedThe Increasing Prevalence of High Frequency Internal Waves in an Arctic Ocean With Declining Sea Ice Cover
    Rippeth, T., Vlasenko, V., Stashchuk, N., Koslov, I., Scannell, B., Green, M., Lincoln, B. & Lenn, Y.-D., 11 Nov 2019, ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, OMAE2019-96621
    Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

2018

2016

2015

2014

2013

2012

2011

2009

2008

2007

2025

2024

2023

2022

2021

2020

2019

  • Arctic Mixing Workshop

    16 Oct 2019 – 18 Oct 2019

    Activity: Participation in Academic workshop, seminar, course (Speaker)
  • BBC News Live Interview. 8 pm news

    5-minute interview about Barents Sea Atlantification

    Jan 2019

    Activity: Types of Public engagement and outreach - Media article or participation (Contributor)
  • BBC Radio Cymru Science Cafe

    Discussion about the Changing Arctic Ocean programme

    Jan 2019

    Activity: Types of Public engagement and outreach - Media article or participation (Contributor)

2018

2016

  • SOS Director for STEM and Schools Engagement

    Development of STEM demonstrations and practicals, training student demonstrators and co-ordination of schools engagement events

    1 Jan 2016 – 1 Jan 2025

    Activity: Types of Public engagement and outreach - Schools engagement (Contributor)

2018-2021 NERC Changing Arctic Ocean: Primary productivity driven by escalating Arctic nutrient fluxes? (Lead Principle Investigator, Lenn)

2010-2015 NERC Postdoctoral Fellowship Principle Investigator

2011-2016 TEA-COSI:The Environment of the Arctic: Climate, Ocean and Sea-Ice UK NERC Consortium: Including Lenn (Project Partner, Bangor.)

2012-2015 Upper ocean heat flux in the Eurasian Basin: Oceanic thermodynamic forcing contributing to Arctic ice loss. USA National Science Foundation grant including Lenn (Project Partner, Bangor) 

QUICCHE: QUantifying Interocean fluxes in the Cape Cauldron Hotspot of Eddy kinetic energy

Project webpage: https://beal-agulhas.earth.miami.edu/research/projects/quicche/index.html