University of Cambridge > Talks.cam > British Antarctic Survey - Polar Oceans seminar series > Ozone forcing of the coupled climate in the Southern Hemisphere

  Browse A-Z

Log in

Cambridge users (raven)details Other usersdetails No account?details

Information on

Subscribing to talksdetails Finding a talkdetails Adding a talkdetails Disseminating talksdetails Help and Documentationdetails

Ozone forcing of the coupled climate in the Southern Hemisphere

Add to your list(s) Download to your calendar using vCal

If you have a question about this talk, please contact Dr Dan Jones.

If external to BAS, please email the organiser in advance to gain access to the building

Interannual variability in the Southern Annular Mode (SAM) and sea ice covary such that an increase and southward shift in the surface westerlies (a positive phase of the SAM ) coincides with an expansion of the sea ice cover, as seen in observations and models alike. Yet, the sea ice extent decreases in response to sustained, multi-decadal positive SAM -like wind anomalies driven by 20th century ozone depletion in modeling studies. Why does sea ice appear to have opposite responses to SAM -like variability on interannual and multidecadal timescales? We demonstrate that the response of sea ice and the Southern Ocean to ozone depletion is a two timescale problem. The two timescales emerge because the fast processes of the surface mixed layer and the slow dynamics of the ocean interior drive Sea Surface Temperature anomalies of opposite sign in response to a SAM perturbation.

This behavior is seen in two models (one with an idealized geometry and another, more sophisticated, global climate model) although we find great uncertainties in the timescale of the transition from the fast to the slow response. Processes that controls this transition are clarified. Implications for the interpretation of observed decadal changes and future climate change in the Southern Hemisphere are discussed.

This talk is part of the British Antarctic Survey - Polar Oceans seminar series series.

Tell a friend about this talk:

This talk is included in these lists:

Note that ex-directory lists are not shown.

Other lists

Chemical Engineering Research Theme Journal Clubs Entrepreneurship Centre at Cambridge Judge Business School The Danby Society: Downing College Science Society The Milner Therapeutics Institute: A new vehicle to facilitate academic/industry interactions in Cambridge Chemistry Departmental-wide lectures The obesity epidemic: Discussing the global health crisis

Other talks

Constructing the virtual fundamental cycle St Catharine’s Political Economy Seminar - ‘Bank Credit Rating Changes, Capital Structure Adjustments and Lending’ by Claudia Girardone Complement and microglia mediated sensory-motor synaptic loss in Spinal Muscular Atrophy Coinage in the later medieval countryside: single-finds and the evidence from Rendlesham, Suffolk ‘Class-work’ in the elite institutions of higher education Atiyah Floer conjecture Cambridge - Corporate Finance Theory Symposium September 2017 - Day 1 The Partition of India and Migration Formation and disease relevance of axonal endoplasmic reticulum, a "neuron within a neuron”. An African orient? West Africans in World War Two India, 1943-1947
 

© 2006-2024 Talks.cam, University of Cambridge. Contact Us | Help and Documentation | Privacy and Publicity