Intensity changes in Typhoon Sinlaku and Typhoon Jangmi in response to varying ocean and atmospheric conditions
DePalma, Charles A.
MetadataShow full item record
Impacts of ocean heat content (OHC) and vertical wind shear on intensity changes of Typhoon Sinlaku and Typhoon Jangmi during the Tropical Cyclone Structure-2008 and THORPEX Pacific Asian Regional Campaign are investigated. Observations of ocean structure variables were obtained in the environment of each typhoon via aircraft-deployed expendable bathythermographs (AXBTs). Strong correspondence among storm intensity changes, ocean features, and vertical wind shear is identified as each tropical cyclone passed over regions of warm and cold ocean features with varying vertical wind shears. Typhoon Sinlaku passed over a cold ocean and with a consistently low vertical wind shear, the storm did not intensify for 12 hours. Sinlaku then reached maximum intensity as it passed over a warm ocean feature while vertical wind shear remained low. Sinlaku also weakened as it passed over an intense cold eddy at a time when vertical wind shear was increasing. Similar impacts are defined for TY Jangmi. Comparison of the AXBT profiles with the East Asian Sea Nowcast/Forecast System (EASNFS) analyses consistently indicated the EASNFS mixed layer depths (MLD) were too shallow, had steeper slopes in the thermocline, and a warm sea-surface temperature (SST) bias. The MLD and SST biases compensated causing OHC differences to be reduced.
Approved for public release; distribution is unlimited.
Showing items related by title, author, creator and subject.
Impacts of potential aircraft observations on forecasts of tropical cyclones over the western North Pacific Mitchell, Mark C. (Monterey, California. Naval Postgraduate School, 2014-12);A goal of The Observing System Research and Predictability Experiment (THORPEX) Pacific Asian Regional Campaign (T-PARC) that was conducted in 2008 over the western North Pacific was to examine the targeted observation for ...
Intensification and structure change of super Typhoon Flo as related to the large-scale environment Titley, David W. (Monterey, California. Naval Postgraduate School, 1998-06-01);A Multi-Quadric (MQ) analysis is developed and compared with the four-dimensional data assimilation analyses of the structure of Typhoons Flo and Ed during the Tropical Cyclone Motion (TCM-90) field experiment. The MQ ...
Sanabia, Elizabeth R. (Monterey, California. Naval Postgraduate School, 2010-06);In September 2008, Typhoon Sinlaku re-intensified from a sheared, asymmetric, weak tropical storm to a typhoon southwest of Japan. The evolution of the tropical cyclone (TC) structure was observed by multiple aircraft as ...