Ocean Heat Content Estimates In The Eastern Pacific Ocean For SHIPS: Progress Lynn “Nick” Shay and Jodi Brewster RSMAS, University of Miami Goal: To assess.

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Presentation transcript:

Ocean Heat Content Estimates In The Eastern Pacific Ocean For SHIPS: Progress Lynn “Nick” Shay and Jodi Brewster RSMAS, University of Miami Goal: To assess the impact of the upper ocean thermal structure on hurricane intensity in EPAC.

Progress To Date: Ocean Heat Content (OHC) has been found to improve intensity forecasting in Atlantic Ocean Basin in SHIPS (DeMaria et al. 2005; Mainelli et al. 2007). Extending the approach to the EPAC given the significant ocean variability. 1.Data Synthesis from EPIC, TAO Moorings, Satellite Radar Altimetry (Topex, Jason-1, GFO and Envisat), XBT transects (to do). 2.Data Comparisons and Integration with GDEM. 3.Monitoring Phase (Equivalent OHC E ). 4.Estimates for SHIPS.

NSF/NOAA Aircraft and TAO Buoys Sample Strategy NOAA WP-3D NCAR- C130

EPAC Paradox Strong vertical temperature, salinity and density gradients at base of OML in EPAC… Implications for mixing…and ocean (SST) cooling. N~20 cph

Blended Altimetry Derived Fields and Warm Eddy Pathway.

NOAA R/V Brown Versus WP-3D CTDs -10N Airborne Oceanography Works!

Sept (left) and Oct (right) OHC of Warm Core Eddy 10 o N TAO Mooring OHC and D20 o C. The shallow isotherm depths may be an indication of the Costa Rica Dome.

Approach: Empirical Approach Reduced gravity (g’), H 20, h (ocean mixed layer depth) GDEM V3. Blend and objectively map SHA from Jason-1, GFO, and Envisat (9.9, 17 and 35-d repeat track). Infer H 20 using mapped SHA and seasonal climatology. Estimate H 26 relative to H 20 (via ratio). Estimate OHC relative to 26 o C using H26, h, and SST.

SSTs at 10 o N, 95 o W: SST Product Choice. TMI/AMSR-E Courtesy of Remote Sensing Systems.

95 o W Ocean Structure: EPIC

10 o N,95 o W: Seasonal Variations T(z), S(z), ρ(z) V2.1 (Top) V3 (Bottom)

Depth of the Climatological Ocean Mixed Layer (m) GDEM V3.

Mean Isotherm Depths (left) & Reduced Gravity and Ratio (right) Costa Rica Dome.

Time Series (left) and Scatter (right) of a) SST, b) H 26 & c) OHC from TAO (blue), Sat (red) and R/V Ron Brown

Summary: NOAA/NSF EPIC, XBT transects and NOAA TAO data providing insights into the formation and propagation of warm eddies in the EPAC and the OHC variability. Not all SST products are equal……Vary by as much as 0.6 o C OHC estimates are significantly less ( 100 kJ cm -2 )-L&V-16 kJ cm -2. Strong stratification (N max ~ 20 cph) underneath the ocean mixed layer precludes strong mixing during TC passage over the warm pool (low latitudes). Comparing time evolution at several TAO moorings in EPAC to establish error bars. Jason-1, GFO, and Envisat SHA fields for daily values using GDEMV3.