Influence of local and remote SST on North Atlantic tropical cyclone potential intensity Suzana J. Camargo, Mingfang Ting and Yochanan Kushnir LDEO, Columbia.

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Presentation transcript:

Influence of local and remote SST on North Atlantic tropical cyclone potential intensity Suzana J. Camargo, Mingfang Ting and Yochanan Kushnir LDEO, Columbia University GloDecH Meeting, OCP, LDEO, December 14, 2011.

Atlantic PDI (power dissipation index ~ V 3 max ) and tropical SST Emanuel, 2005

20 th century North Atlantic SST and Potential Intensity (PI)

PDI and SST PDI and relative SST Vecchi and Soden 2007

Atlantic Hurricanes trends: dependency on tracks Kossin and Camargo, Climatic Change (2009)

Objective: – Contributions of natural variability and anthropogenic trend to North Atlantic potential intensity CCM3 simulations – GOGA: global SST – TAGA: tropical Atlantic SST – POGA (not shown) 16 ensemble members, – Idealized simulations: Warm Atlantic, Cold Atlantic Warm Tropical Atlantic, Cold Tropical Atlantic

PI GOGA & Reanalysis I Climatological Annual Maximum

PI GOGA and Reanalysis II JJASON – Atlantic Hurricane season

PI Anomaly GOGA and Reanalysis Atlantic Main Development Region (MDR)

PI GOGA & TAGA

PI GOGA & TAGA II

Climate Change and Internal Variability (AMO) indices Ting et al. 2009

Regression Patterns: PI and AMO & CC indices CC

Regression time-series:

Role of extra-tropics: Idealized SST patterns

Summary Remote SST reduces trend of North Atlantic PI (confirming Vecchi and Soden 2007). Remote SST also slightly reduces AMO effect on PI in the North Atlantic. Differences of PI for GOGA and TAGA related to the AMO not due to Pacific (POGA) or Atlantic extra- tropical SST: causes are not clear. Late 20 th century PDI upward trend (Emanuel 2005) probably not dominated by climate change, but internal variability (AMO) as hinted in DelSole et al Next step analysis of PI in the 21 st century in the CMIP5 simulations.