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Are Tropical Cyclones Changing the Meridional Overturning Circulation?. Gino. Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?. Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?. GHG Warming. Wind Stress Increase. OCEAN. MORE MIXING. z. EQ. - PowerPoint PPT Presentation
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Are Tropical Cyclones Changing the Meridional Overturning Circulation?
Gino
• Heat Pump for MOC?
• Heat Pump for El Nino?
• MOC changed by TC?
OCEAN
GHG Warming
Wind Stress Increase
MORE MIXING
z
EQ NS
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
Meridional TOA Net Radiation
MOCWind-Driven Lateral Gyres
Atmosphere; 50%
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
2 Mechanism for MOC
Isopycnal
Diapynal
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
Net heating at this stage
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
Net Mixed Layer Cooling
Surface heat flux 15%
Entrainment 85%
Price 1981
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
Mixed at base of Mixed Layer
Rightward bias
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
Ekman PumpingHeat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
- SSH: Ekman Pumping Cooling
+ SSH: Rightward Net Warming
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
Heat Content Calculation
• Net Cooling (Mixed Layer)
• Net Warming (Total Column)
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
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?
• 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?
TC-mixed-parcel Track
EQ
20N
El NinoEQ Undercurrent
PACIFIC OCEAN
TC Mixing
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
No TC mixing
Full Band TC mixing
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
Increase CO2 Only
Increase CO2Increase Vertical Diffusivity 8 – 40 N & S
Preindustrial CO2
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
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?
Heat Pump for MOC? Heat Pump for El Nino? MOC changed by TC?
• 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?
reference
• Emanuel 2001 Contribution of tropical cyclones to meridional heat transport by the oceans
• Fedorov 2009 Tropical cyclones and permanent El Niño in the early Pliocene epoch
• Sriver 2010 Climate response to tropical cyclone-induced ocean mixing in an Earth system model of intermediate complexity