[Eoas-seminar] REMINDER***REMINDER**TODAY**** GFDI COLLOQUIUM, MON. MARCH 21, 2016 at 1:00PM IN MELVIN STERN SEMINAR ROOM, #18 KEEN BLDG.

eoas-seminar at lists.fsu.edu eoas-seminar at lists.fsu.edu
Mon Mar 21 09:15:26 EDT 2016


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&                                                       GFDI COLLOQUIUM                                                                                        &

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Title

"Global Ocean Vertical Heat Flux and Its Bidecadal Change"

Speaker

Dr. Xinfeng Liang

USF College of Marine Science

Time
Monday, March 21, 2016 at 1:00PM

Place
Melvin Stern Seminar Room
Room 18 Keen Bldg.

Refreshments will be served at 12:45PM
Abstract:

Using a dynamically consistent state estimate, the vertical redistribution of heat within the ocean is investigated over a 20-year period (1992-2011). The 20-year mean vertical heat flux shows strong variations both horizontally and vertically, consistent with the ocean being a dynamically active and spatially complex heat exchanger. Between mixing and advection, the two processes determining the vertical heat transport in the deep ocean, advection plays a more important role in setting the spatial patterns of vertical heat exchange. The global integral of vertical heat flux shows an upward heat transport in the deep ocean, suggesting an abyssal cooling trend over 1992-2011. These results support the inference that the near-surface thermal properties of the ocean are a consequence, at least in part, of internal redistribution of heat, some of which must reflect water that has undergone long trajectories since last exposure to the atmosphere.

Analysis of the change in the bidecadal vertical heat flux provides dynamical insights into the global ocean heat content change. Preliminary results show that above 1500 m more heat is transported downward during 2002-2011 than 1992-2001. The spatial pattern of the vertical heat flux change shows consistent features with previous studies. Whereas the spatial pattern of vertical heat flux change is closely related to the advection term, its global integral is largely determined by the change in mixing, indicating a crucial role of ocean mixing in explaining the long-term change of ocean vertical heat exchange.
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