Harry Bryden

Last updated

Harry Bryden
Born
Harry Leonard Bryden

(1946-07-09) 9 July 1946 (age 74)
Providence, Rhode Island, United States of America
NationalityAmerican, British
Alma mater Dartmouth College, Massachusetts Institute of Technology-Woods Hole Oceanographic Institution
Known for Thermohaline circulation
Awards
Scientific career
Fields Physical oceanographer
Institutions Oregon State University (OSU), Woods Hole Oceanographic Institution (WHOI), National Institute of Oceanography (NIO), National Oceanography Centre, Southampton (NOCS)
Doctoral advisor Nick Fofonoff
Website noc.soton.ac.uk/JRD/HYDRO/hlb/

Harry Leonard Bryden, FRS (born 9 July 1946) is an American physical oceanographer, professor at University of Southampton, [1] and staff at the National Oceanography Centre, Southampton. [2] He is best known for his pioneering work in ocean circulation and in the role of the ocean in the Earth's climate. [3]

Contents

Early life and education

Born in Providence, Rhode Island in 1946, Bryden received his A.B. degree in mathematics from Dartmouth College. For a short period after graduation, he worked as a mathematician on oceanographic topics for offices of the United States Navy in Maryland and Connecticut. Bryden's doctoral training in oceanography was undertaken at the Massachusetts Institute of Technology (MIT) and the Woods Hole Oceanographic Institution (WHOI) through the long-standing joint program for students that operates between these institutes. [4] During his time at MIT-WHOI, Bryden completed and published work on a number of topics including water mass properties, [5] Mediterranean outflow [6] and geostrophy. [7] He was supervised initially by Henry Stommel and then principally by Nick Fofonoff, and his thesis title was "Momentum, Mass, Heat, and Vorticity Balances from Oceanic Measurements of Current and Temperature". [8]

Career

Upon competing his doctoral thesis, Bryden briefly moved to Oregon State University to work as a post-doctoral researcher, before returning to WHOI in 1977. He was awarded tenure at WHOI in 1983, and remained there until 1992, ultimately reaching the position of Senior Scientist. Bryden then moved to the United Kingdom and the Institute of Oceanographic Sciences (IOS), a unit funded by the Natural Environment Research Council (NERC). He moved with IOS to Southampton when it partnered with the University of Southampton to create the Southampton Oceanography Centre, and has remained with its successor institutes. Though partially retired, Bryden remains active at the University of Southampton in both research and the wider scientific community.

A particular focus of Bryden's research is the large-scale thermohaline circulation of the ocean, in particular its role in transporting heat. [9] [10] A decline in the strength of the Atlantic Meridional Overturning Circulation (AMOC) caused by global warming has been hypothesised, and Bryden and colleagues have studied this via the RAPID array [11] that crosses the Atlantic at 26.5°N. [12] [13]

Awards and honours

In 2003, Bryden both became a Fellow of the American Meteorological Society, and was awarded the society's Henry Stommel Research Award "for fundamental and elegant observational contributions to understanding the oceanic general circulation". In 2005, Bryden was elected a Fellow of the Royal Society. [14] In 2009, he won the Prince Albert I Medal "in recognition of his fundamental contributions to understanding the ocean's role in the global climate system". [15] In 2010, Bryden was elected a Fellow of the American Geophysical Union. [16] Bryden served as President of the Challenger Society for Marine Science from 2010 to 2012. In late 2012, the European Geosciences Union awarded Bryden the 2013 Fridtjof Nansen Medal for his contributions to Earth sciences. [17] In 2013, in recognition of his work, Bryden was elected an Honorary Fellow of the Royal Meteorological Society (RMetS). [18]

Related Research Articles

Oceanography The study of the physical and biological aspects of the ocean

Oceanography, also known as oceanology, is the study of the physical and biological aspects of the ocean. It is an important Earth science, which covers a wide range of topics, including ecosystem dynamics; ocean currents, waves, and geophysical fluid dynamics; plate tectonics and the geology of the sea floor; and fluxes of various chemical substances and physical properties within the ocean and across its boundaries. These diverse topics reflect multiple disciplines that oceanographers blend to further knowledge of the world ocean and understanding of processes within: astronomy, biology, chemistry, climatology, geography, geology, hydrology, meteorology and physics. Paleoceanography studies the history of the oceans in the geologic past. An oceanographer is a person who studies many matters concerned with oceans including marine geology, physics, chemistry and biology.

Woods Hole Oceanographic Institution Private, nonprofit research and education facility

The Woods Hole Oceanographic Institution is a private, nonprofit research and higher education facility dedicated to the study of marine science and engineering. WHOI is dedicated to advancing knowledge of the ocean and its connection with the Earth system through a sustained commitment to excellence in science, engineering, and education, and to the application of this knowledge to problems facing society.

Physical oceanography The study of physical conditions and physical processes within the ocean

Physical oceanography is the study of physical conditions and physical processes within the ocean, especially the motions and physical properties of ocean waters.

Thermohaline circulation A part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes

Thermohaline circulation (THC) is a part of the large-scale ocean circulation that is driven by global density gradients created by surface heat and freshwater fluxes. The adjective thermohaline derives from thermo- referring to temperature and -haline referring to salt content, factors which together determine the density of sea water. Wind-driven surface currents travel polewards from the equatorial Atlantic Ocean, cooling en route, and eventually sinking at high latitudes. This dense water then flows into the ocean basins. While the bulk of it upwells in the Southern Ocean, the oldest waters upwell in the North Pacific. Extensive mixing therefore takes place between the ocean basins, reducing differences between them and making the Earth's oceans a global system. The water in these circuits transport both energy and mass around the globe. As such, the state of the circulation has a large impact on the climate of the Earth.

Agulhas Current Western boundary current of the southwest Indian Ocean that flows down the east coast of Africa

The Agulhas Current is the western boundary current of the southwest Indian Ocean. It flows south along the east coast of Africa from 27°S to 40°S. It is narrow, swift and strong. It is suggested that it is the largest western boundary current in the world ocean, with an estimated net transport of 70 sverdrups, as western boundary currents at comparable latitudes transport less — Brazil Current, Gulf Stream, Kuroshio.

Walker circulation

The Walker circulation, also known as the Walker cell, is a conceptual model of the air flow in the tropics in the lower atmosphere (troposphere). According to this model, parcels of air follow a closed circulation in the zonal and vertical directions. This circulation, which is roughly consistent with observations, is caused by differences in heat distribution between ocean and land. It was discovered by Gilbert Walker. In addition to motions in the zonal and vertical direction the tropical atmosphere also has considerable motion in the meridional direction as part of, for example, the Hadley Circulation.

Jonathan M. Gregory

Jonathan Michael Gregory is a climate modeller working on mechanisms of global and large-scale change in climate and sea level on multidecadal and longer timescales at the Met Office and the University of Reading.

Henry Stommel

Henry "Hank" Melson Stommel was a major contributor to the field of physical oceanography. Beginning in the 1940s, he advanced theories about global ocean circulation patterns and the behavior of the Gulf Stream that form the basis of physical oceanography today. Widely recognized as one of the most influential and productive oceanographers of his time, Stommel was both a groundbreaking theoretician and an astute, seagoing observer.

Paleoceanography is the study of the history of the oceans in the geologic past with regard to circulation, chemistry, biology, geology and patterns of sedimentation and biological productivity. Paleoceanographic studies using environment models and different proxies enable the scientific community to assess the role of the oceanic processes in the global climate by the re-construction of past climate at various intervals. Paleoceanographic research is also intimately tied to paleoclimatology.

Shutdown of thermohaline circulation An effect of global warming on a major ocean circulation.

A shutdown or slowdown of the thermohaline circulation is a hypothesized effect of global warming on a major ocean circulation.

Atlantic meridional overturning circulation system of currents in the Atlantic Ocean, having a northward flow of warm, salty water in the upper layers and a southward flow of colder, deep waters that are part of the thermohaline circulation

The Atlantic meridional overturning circulation (AMOC) is the zonally-integrated component of surface and deep currents in the Atlantic Ocean. It is characterized by a northward flow of warm, salty water in the upper layers of the Atlantic, and a southward flow of colder, deep waters that are part of the thermohaline circulation. These "limbs" are linked by regions of overturning in the Nordic and Labrador Seas and the Southern Ocean. The AMOC is an important component of the Earth's climate system, and is a result of both atmospheric and thermohaline drivers.

Ocean heat content Thermal energy stored in ocean water

In oceanography and climatology, ocean heat content (OHC) is a term for the energy absorbed by the ocean, which is stored as internal energy or enthalpy. Changes in the ocean heat content play an important role in the sea level rise, because of thermal expansion.

John Crossley Swallow FRS was an English oceanographer who invented the Swallow float, a scientific drifting bottle based on the messages in bottles that shipwrecked sailors hoped would reach inhabited shores, summoning assistance.

Gulf Stream A warm, swift Atlantic current that originates in the Gulf of Mexico flows around the tip of Florida, along the east coast of the United States before crossing the Atlantic Ocean

The Gulf Stream, together with its northern extension the North Atlantic Drift, is a warm and swift Atlantic ocean current that originates in the Gulf of Mexico and stretches to the tip of Florida, and follows the eastern coastlines of the United States and Newfoundland before crossing the Atlantic Ocean as the North Atlantic Current. The process of western intensification causes the Gulf Stream to be a northwards accelerating current off the east coast of North America. At about 40°0′N30°0′W, it splits in two, with the northern stream, the North Atlantic Drift, crossing to Northern Europe and the southern stream, the Canary Current, recirculating off West Africa.

Michael Fasham A British ocean ecosystem modeller, working principally on plankton systems

Michael John Robert Fasham, FRS was a British oceanographer and ecosystem modeller. He is best known for his pioneering work in the development of open ocean plankton ecosystem models.

The Rapid Climate Change-Meridional Overturning Circulation and Heatflux Array program is a collaborative research project between the National Oceanography Centre, the University of Miami’s Rosenstiel School of Marine and Atmospheric Science (RSMAS), and NOAA’s Atlantic Oceanographic and Meteorological Laboratory (AOML) that measure the meridional overturning circulation (MOC) and ocean heat transport in the North Atlantic Ocean. This array was deployed in March 2004 to continuously monitor the MOC and ocean heat transport that are primarily associated with the Thermohaline Circulation across the basin at 26°N. The RAPID-MOCHA array is planned to be continued through 2014 to provide a decade or longer continuous time series.

Mode water A type of water mass which is nearly vertically homogeneous

Mode water is defined as a particular type of water mass, which is nearly vertically homogeneous. Its vertical homogeneity is caused by the deep vertical convection in winter. The first term to describe this phenomenon is 18° water, which is used by L.V. Worthington to describe the isothermal layer in the northern Sargasso Sea cool to a temperature of about 18 °C each winter. Then Masuzawa introduced the subtropical mode water concept to describe the thick layer of temperature 16–18 °C in the northwestern North Pacific subtropical gyre, on the southern side of the Kuroshio Extension. The terminology mode water was extended to the thick near-surface layer north of the Subantarctic Front by McCartney, who identified and mapped the properties of the Subantarctic mode water (SAMW). After that, McCartney and Talley then applied the term subpolar mode water (SPMW) to the thick near-surface mixed layers in the North Atlantic’s subpolar gyre.

Cold blob (North Atlantic) A cold temperature anomaly of ocean surface waters, affecting the Atlantic Meridional Overturning Circulation

The cold blob in the North Atlantic describes a cold temperature anomaly of ocean surface waters, affecting the Atlantic Meridional Overturning Circulation (AMOC) which is part of the thermohaline circulation, possibly related to global warming-induced melting of the Greenland ice sheet.

George Ridsdale Goldsbrough FRS was an English mathematician and mathematical physicist.

Caroline C. Ummenhofer is a physical oceanographer at the Woods Hole Oceanographic Institution where she studies extreme weather events with a particular focus on the Indian Ocean. Ummenhofer makes an effort to connect her discoveries about predicting extreme weather events and precipitation to helping the nations affected.

References

  1. "Guide to expertise: Professor Harry Bryden". University of Southampton. Retrieved 14 May 2012.
  2. "Homepage: Professor Harry Bryden". National Oceanography Centre, Southampton. Retrieved 14 May 2012.
  3. Biography, Challenger Society for Marine Science Archived 3 March 2016 at the Wayback Machine
  4. "MIT/WHOI Joint Program". Woods Hole Oceanographic Institute. Retrieved 14 May 2012.
  5. Bryden, H.L. (1973). "New polynomials for thermal expansion, adiabatic temperature gradient and potential temperature of sea water". Deep-Sea Research. 20 (4): 401–408. doi:10.1016/0011-7471(73)90063-6.
  6. Stommel, H.; Bryden, H.L.; Mangelsdorf, P. (1973). "Does some of the Mediterranean outflow come from great depth?". Pure and Applied Geophysics. 105 (1): 879–889. Bibcode:1973PApGe.105..879S. doi:10.1007/BF00875837.
  7. Bryden, H.L. (1974). "Geostrophic comparisons using moored measurements of current and temperature". Nature. 251 (5474): 409–410. Bibcode:1974Natur.251..409B. doi:10.1038/251409a0.
  8. Bryden, H.L. (1975). Momentum, mass, heat, and vorticity balances from oceanic measurements of current and temperature (PhD). Massachusetts Institute of Technology. hdl:1721.1/51384.
  9. Bryden, H.L.; Hall, M.M. (1980). "Heat transport by currents across 25°N latitude in the Atlantic Ocean". Science. 207 (4433): 884–886. Bibcode:1980Sci...207..884B. doi:10.1126/science.207.4433.884. PMID   17729868.
  10. Bryden, H.L.; Roemmich, D.H.; Church, J.A. (1991). "Ocean heat transport across 24°N in the Pacific". Deep-Sea Research. 38 (3): 297–324. Bibcode:1991DSRI...38..297B. doi:10.1016/0198-0149(91)90070-V.
  11. "'The Day After Tomorrow' – fact or fiction?". Natural Environment Research Council. 28 May 2004. Archived from the original on 21 March 2012. Retrieved 13 May 2012.
  12. Bryden, H.L.; Longworth, H.R.; Cunningham, S.A. (2005). "Slowing of the Atlantic meridional overturning circulation at 25°N". Nature. 438 (7068): 655–657. Bibcode:2005Natur.438..655B. doi:10.1038/nature04385. PMID   16319889.
  13. Cunningham, S.A.; Kanzow, T.; Rayner, D.; Baringer, M.O.; Johns, W.E.; Marotzke, J.; Longworth, H.R.; Grant, E.M.; Hirschi, J.J-M.; Beal, L.M.; Meinen, C.S.; Bryden, H.L. (2007). "Temporal Variability of the Atlantic Meridional Overturning Circulation at 26.5°N". Science. 317 (5840): 935–938. Bibcode:2007Sci...317..935C. doi:10.1126/science.1141304. PMID   17702940.
  14. "Royal Society honour for Southampton scientists". University of Southampton. 1 June 2005. Archived from the original on 7 August 2007. Retrieved 13 May 2012.
  15. "The Prince Albert I Medal: Prof. Harry L. Bryden". International Association for the Physical Sciences of the Ocean. Retrieved 14 May 2012.
  16. "2010 Fellow: Harry L. Bryden". American Geophysical Union. Retrieved 14 May 2012.
  17. "EGU announces 2013 Awards and Medals". European Geosciences Union. 22 October 2012. Retrieved 20 December 2012.
  18. "Honorary Fellows of RMetS". Royal Meteorological Society. Retrieved 26 July 2016.