Sack Lunch Seminars

February 6th: Samar Khatiwala LDEO Fast spin up of global ocean biogeochemical models using matrix-free Newton-Krylov	Add to my calendar (ics file)
A novel computational approach is introduced for the efficient computation of equilibrium solutions of seasonally forced ocean biogeochemical models. The essential idea is to formulate the problem as a large system of nonlinear algebraic equations to be solved with a… Check the full abstract here

February 13rd: Ben MARZEION U. Bergen / MIT The role of stratification-dependent mixing for the stability of the Atlantic overturning in a global climate model	Add to my calendar (ics file)
Using a coupled climate model of intermediate complexity, the effect of stratification-dependent vertical diffusivity on the sensitivity of the Atlantic Ocean meridional overturning circulation to perturbations in the forcing is investigated… Check the full abstract here

February 20th: William CURRY WHOI Atlantic Ocean Deep Circulation 21,000 Years Ago
Our understanding of past changes in ocean circulation comes from tracer chemistry in fossil benthic foraminifera, which provide the means to reconstruct past deep water mass circulation patterns. The most complete synthesis of past circulation is for the … Check the full abstract here

February 27th: Bruno TREMBLAY Mc GILL An ice free Arctic ?	Add to my calendar (ics file)
The year 2007 marked a record low in Arctic summer sea-ice extent, with 20% less ice area than the previous all-time record minimum of 2005 - this is equivalent to an area 9 times that of New York state. This is part of a long-term … Check the full abstract here