Tropical Tropopause

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sity, the damping coefficient for the sponge layer applied above the lowest altitude subject to TLC will be varied. Indeed, this damping could be chosen large to remove TLC and observe the ef- fects on TC intensity and structure. The main limitation for this experiment is the proximity of TLC and the top of convective clouds. Damping too close to the cloud top might apply a forc- ing on convection in ways that could modify the TLC-intensity relationship. The characteristics of the tropopause (height, temperature, sharpness) in the background profile will also be varied to determine the relationship between these characteristics and the cooling that develops near the tropopause. Other limitations identified in this experiment include the fact…show more content…
The fluxes will be calculated using reanalysis data for hurricane days versus non hurricane days (in the Atlantic for instance) on a given isentrope near the tropical tropopause. Three reanalyses will be used: the Modern-Era Retrospective analysis for Research and Applications (MERRA), the MERRA Version 2 (MERRA-2), and the European Centre for Medium-Range Weather Forecasts’ latest reanalysis (ERA-Interim). While the three reanalyses of choice might not represent the inten- sity, size, and position of TCs well enough (e.g., Schenkel and Hart (2012)), their representation of the thermal structure of TCs is close to that observed using GPS RO (cf Figure 3 for MERRA-2). This suggests that these reanalyses might be a valuable tool to assess the average eddy fluxes of potential temperature. The reanalyzed structure of the water content field in TCs is unknown…show more content…
(2015) will be adapted to derive this transport from temperature and humid- ity retrievals from the Microwave Limb Sounder (MLS) on board the Aura satellite, for hurricane days and non hurricane days. MLS data have 1-3 km vertical resolution and ∼200 km horizontal resolution in the UTLS. Cross correlations between time series of the temperature/water content anomalies will be calculated for two consecutive latitudes at a given pressure level. The
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