edu.ucar.opensky::articles:27415 UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact 2025-12-24T18:10:13.036057 ISO 19115-2 Geographic Information - Metadata - Part 2: Extensions for Imagery and Gridded Data ISO 19115-2:2009(E) https://n2t.org/ark:/85065/d7bg2t7w Diagnosing radial ventilation in dropsonde observations of Hurricane Sam (2021) 2024-08-01T00:00:00Z publication https://n2t.org/ark:/85065/d7bg2t7w https://doi.org/10.1175/MWR-D-23-0224.1 Tang, B. H. author Rios-Berrios, Rosimar author Zhang, J. A. author UCAR/NCAR - Library publisher This study presents a method to diagnose radial ventilation, the horizontal flux of relatively low-9e 9 e air into tropical cyclones, from dropsonde observations. We used this method to investigate ventilation changes over three consecutive sampling periods in Hurricane Sam (2021), which underwent substantial intensity changes over 3 days. During the first and last periods, coinciding with intensification, the ventilation was relatively small due to a lack of spatial correlation between radial flow and 9e e azimuthal asymmetries. During the second period, coinciding with weakening, the ventilation was relatively large. The increased ventilation was caused by greater shear associated with an upper-level trough, tilting the vortex, along with dry, low-9e 9 e air wrapping in upshear. The spatial correlation of the radial inflow flow and anomalously low-9e 9 e air resulted in large ventilation at mid- to upper levels. Additionally, at low to midlevels, there was evidence of mesoscale inflow fl ow of low-9e 9 e air in the stationary band complex. The location of these radial ventilation pathways and their effects on Sam's intensity are consistent with previous idealized and real-case modeling studies. More generally, this method offers a way to monitor ventilation changes in tropical cyclones, particularly when there is full-troposphere sampling around and within a tropical cyclone's core. UCAR/NCAR - Library OpenSky Support PO Box 3000 Boulder CO 80307-3000 opensky@ucar.edu http://opensky.ucar.edu/ homepage pointOfContact PDF Text theme Resource Type 2016-01-01T00:00:00Z publication Copyright 2024 American Meteorological Society (AMS). None eng geoscientificInformation