Observations of temperature in the upper troposphere and Lower stratosphere of tropical weather disturbances

AMS Citation:
Davis, C. A., D. Ahijevych, J. A. Haggerty, and M. J. Mahoney, 2014: Observations of temperature in the upper troposphere and Lower stratosphere of tropical weather disturbances. Journal of the Atmospheric Sciences, 71, 1593-1608, doi:10.1175/JAS-D-13-0278.1.
Date:2014-05-01
Resource Type:article
Title:Observations of temperature in the upper troposphere and Lower stratosphere of tropical weather disturbances
Abstract: Microwave temperature profiler (MTP) data are analyzed to document temperature signatures in the upper troposphere and lower stratosphere that accompany Atlantic tropical weather disturbances. The MTP was deployed on the National Science Foundation–National Center for Atmospheric Research Gulfstream V (GV) aircraft during the Pre-Depression Investigation of Cloud-Systems in the Tropics (PREDICT) in August and September 2010. Temporal variations in cold-point temperature compared with infrared cloud-top temperature reveal that organized deep convection penetrated to near or beyond the cold point for each of the four disturbances that developed into a tropical cyclone. Relative to the lower-tropospheric circulation center, MTP and dropsonde data confirmed a stronger negative radial gradient of temperature in the upper troposphere (10–13 km) of developing disturbances prior to genesis compared with nondeveloping disturbances. The MTP data revealed a somewhat higher and shallower area of relative warmth near the center when compared with dropsonde data. MTP profiles through anvil cloud depicted cooling near 15 km and warming in the lower stratosphere near the time of maximum coverage of anvil clouds shortly after sunrise. Warming occurred through a deep layer of the upper troposphere toward local noon, presumably associated with radiative heating in cloud. The temperature signatures of anvil cloud above 10-km altitude contributed to the radial gradient of temperature because of the clustering of deep convection near the center of circulation. However, it is concluded that these signatures may be more a result of properties of convection than a direct distinguishing factor of genesis.
Peer Review:Refereed
Copyright Information:Copyright 2014 American Meteorological Society (AMS). Permission to use figures, tables, and brief excerpts from this work in scientific and educational works is hereby granted provided that the source is acknowledged. Any use of material in this work that is determined to be "fair use" under Section 107 or that satisfies the conditions specified in Section 108 of the U.S. Copyright Law (17 USC, as revised by P.L. 94-553) does not require the Society's permission. Republication, systematic reproduction, posting in electronic form on servers, or other uses of this material, except as exempted by the above statements, requires written permission or license from the AMS. Additional details are provided in the AMS Copyright Policies, available from the AMS at 617-227-2425 or amspubs@ametsoc.org. Permission to place a copy of this work on this server has been provided by the AMS. The AMS does not guarantee that the copy provided here is an accurate copy of the published work.
OpenSky citable URL: ark:/85065/d79g5nrc
Publisher's Version: 10.1175/JAS-D-13-0278.1
Author(s):
  • Christopher Davis - NCAR/UCAR
  • David Ahijevych - NCAR/UCAR
  • Julie Haggerty - NCAR/UCAR
  • Michael Mahoney
  • Random Profile

    ADMIN ASSISTANT III

    Recent & Upcoming Visitors