JHW1711_bOffice: 301 & 329 Olin Hall

P/F: 410-516-7048/410-516-7933

Email: [email protected]

Ocean Circulation and Dynamics, Ocean’s Role in Climate

My overall research interest is the fundamental understanding of the physics of the basin-scale ocean and its role in Earth’s climate. I am involved in improving estimates of the geophysical state of the ocean circulation through analysis of field data and circulation model results. The subpolar North Atlantic and Arctic Ocean ventilation process (rates, pathways, variability, and mechanisms) interest me in particular. High latitude physical oceanography, in both hemispheres, is another research theme. I also investigate key physical processes that maintain the state of the global upper ocean focusing on fluid dynamics and thermodynamics and their role in controlling sea surface temperature variability over years to decades. These are all examples of rotating stratified fluid dynamics, an amazing and beautiful subject.

Knowledge of these processes is vital if we are to describe and understand climatic fluctuations on time-scales of years to decades. At these low frequencies we know that the ocean and atmosphere interact as a coupled system. Understanding low frequency natural climate perturbations is clearly a problem of special current relevance. Further, explaining natural climate variability is a prerequisite of addressing mankind’s effect on global climate.

Moreover, this understanding guides our thinking about other oceans in time and space. Recent discoveries of extra-terrestrial oceans in our solar system and recognition of how much Earth’s ocean has changed in the past, galvanizes me to think about the role of oceans in planetary system dynamics writ large.

Or, to quote the visionary polymath Alexander von Humboldt (1769–1859):

It is the duty of philosophers to determine and adjust their various elements, according to the sublime model of astronomical science, in order that some of those eternal laws may be made known by which the climatic changes of the firmament are dependent on the liquid and aerial currents of our planet.


2012–2018 Morton K. Blaustein Chair and Professor of Earth & Planetary Sciences, Johns Hopkins University.

2000– Assistant, Associate, then Full Professor, Johns Hopkins University.

1996 University Lecturer in Physics, University of Oxford, UK.

1994 Postdoc, MIT.

1993 Ph.D. Physical Oceanography, University of Southampton, UK (alumnus profile).

1992 M.A. Physics & Theoretical Physics, University of Cambridge, UK.

1988 B.A. Physics & Theoretical Physics, University of Cambridge, UK

Recent full CV with full publication list

RSS news feed: https://sites.krieger.jhu.edu/haine/?feed=rss2

News & Announcements

Miguel moves to OPeNDAP

Group member

Assistant research scientist, Miguel Jimenez-Urias, has moved to a new job with OPeNDAP as a Scientific Community Director. Miguel spent four years in our group working on the Poseidon Project and on the theory of tracer dispersion. Good luck Miguel!

Postdoc vacancy


We’re looking for a postdoc to join the group. The project focuses on processes in the subinertial frequency range (several days) in the subpolar North Atlantic region, in particular the Greenland-Scotland Ridge. Details of the vacancy, and information on how to apply are here. The deadline for applications in January 19, 2024.

How fluid tracers spread: New paper on shear dispersion

Graphical Abstract

Assistant Research Scientist Miguel Jiménez-Urias has published a paper on the dispersion of passive tracer. The title is “On the non-self-adjoint and multiscale character of passive scalar mixing under laminar advection” and the paper appears in the Journal of Fluid Mechanics. Miguel writes in the paper’s Abstract: “Except in the trivial case of spatially uniform...

Renske Gelderloos moves to faculty job

Group member

After several years in our group, Associate Research Scientist Renske Gelderloos is moving!  She’s accepted a position as a Universitair Docent at the Delft University of Technology in the Netherlands. This is a permanent faculty position in Physical Oceanography & Sea Level in the department of Civil Engineering and Geosciences. The position is part of the university’s Climate Action...

Jie Ma joins research group

Group member

Jie Ma has joined the research group. Jie is a student in the Data Science Masters program in Applied Math & Statistics, Whiting School of Engineering. She will conduct her capstone Masters project with the group on the fates and pathways of wastewater discharged from the Fukushima nuclear power plant in Japan. Prior to JHU,...