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Are Tropical Cyclones Changing the Meridional Overturning Circulation? Gino.

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Presentation on theme: "Are Tropical Cyclones Changing the Meridional Overturning Circulation? Gino."— Presentation transcript:

1 Are Tropical Cyclones Changing the Meridional Overturning Circulation? Gino

2 Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

3 OCEAN GHG Warming Wind Stress Increase MORE MIXING z EQ NS Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

4 Meridional TOA Net Radiation Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

5 2 Mechanism for MOC Isopycnal Diapynal Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

6 Net heating at this stage Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

7 Net Mixed Layer Cooling Price 1981 Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

8 Mixed at base of Mixed Layer Rightward bias Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

9 Ekman Pumping Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

10 - SSH: Ekman Pumping Cooling + SSH: Rightward Net Warming Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

11 Heat Content Calculation Net Cooling (Mixed Layer) Net Warming (Total Column) Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

12 Result Net Warming by TC : (Emanuel 01) Peak Poleward transport : (Macdonald and Wunsch 96) Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

13 MOC required mixing (Munk and Wunsch 98) ? TC induced MOC (Emanuel 01) ? Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

14 TC-mixed-parcel Track EQ 20N EQ Undercurrent PACIFIC OCEAN TC Mixing Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

15 No TC mixing Full Band TC mixing Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

16 Increase CO2 Only Increase CO2 Increase Vertical Diffusivity 8 – 40 N & S Increase CO2 Increase Vertical Diffusivity 8 – 40 N & S Preindustrial CO2 Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

17 Uvic Model (OGCM) Based on Modular Ocean Model Initialized with Modern Climatology No Dynamic Atmosphere 3000 yr Control Run: without TC mixing Exp Run: TC mixing parameterization Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

18

19 Subtropical Overturning Circulation dominates in 10N – 30N upper ocean TC Mixing effect confined in tropics! Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?

20 reference Emanuel 2001 Contribution of tropical cyclones to meridional heat transport by the oceans Emanuel 2001 Fedorov 2009 Tropical cyclones and permanent El Niño in the early Pliocene epoch Fedorov 2009 Sriver 2010 Climate response to tropical cyclone-induced ocean mixing in an Earth system model of intermediate complexity Sriver 2010

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