A global climatology of diabatic heating in Tropical Easterly Waves

Tropical easterly waves (TEWs) play a critical role in regulating convection and precipitation across the global tropics. TEWs act as seed disturbances for tropical cyclogenesis, serve as an essential component in monsoon precipitation, and produce large amounts of rainfall and diabatic heating that can strongly affect the large-scale circulation. To help improve our knowledge of a more elusive type of tropical wave, we use satellite and reanalysis estimates of the diabatic heating associated with TEWs that are identified by a tracking algorithm based on low-level curvature vorticity. This study uses the Tropical Rainfall Measuring Mission (TRMM) version 6 convective-stratiform heating (CSH) and spectral latent heating (SLH) orbital products to create a global climatology (1998-2015) of TEW diabatic heating. TEW-specific composites for the satellite -observed vertical structure of diabatic heating are compared to similar terms from MERRA-2 across a variety of tropical regions. There are striking differences between the reanalysis and satellite heating with MERRA-2 having much stronger background heating, especially at low levels. Both the satellite -observed and reanalysis heating profiles show stronger midlevel heating associated with TEWs relative to the unconditional background. Similar patterns of mid- and bottom -heaviness emerge in two-dimensional composites of TEW latent heating as stronger heating rates and percent contributions to the background are generally higher at 500 hPa than at 850 hPa. Although TEWs only represent a few percent of the background heating across the global tropics, they comprise 30%-50% of the heating in the prominent TEW tracks over the northeastern Atlantic and Pacific Oceans.

To Access Resource:

Questions? Email Resource Support Contact:

  • opensky@ucar.edu
    UCAR/NCAR - Library

Resource Type publication
Temporal Range Begin N/A
Temporal Range End N/A
Temporal Resolution N/A
Bounding Box North Lat N/A
Bounding Box South Lat N/A
Bounding Box West Long N/A
Bounding Box East Long N/A
Spatial Representation N/A
Spatial Resolution N/A
Related Links

Related Software #1 : mahollis3313/TEW-tracks: TEW Tracks

Additional Information N/A
Resource Format PDF
Standardized Resource Format PDF
Asset Size N/A
Legal Constraints

Copyright 2024 American Meteorological Society (AMS).


Access Constraints None
Software Implementation Language N/A

Resource Support Name N/A
Resource Support Email opensky@ucar.edu
Resource Support Organization UCAR/NCAR - Library
Distributor N/A
Metadata Contact Name N/A
Metadata Contact Email opensky@ucar.edu
Metadata Contact Organization UCAR/NCAR - Library

Author Lewis-Merritt, C.
Stachnik, J. P.
Hollis, M. A.
Martin, E. R.
McCrary, Rachel
Publisher UCAR/NCAR - Library
Publication Date 2024-03-15T00:00:00
Digital Object Identifier (DOI) Not Assigned
Alternate Identifier N/A
Resource Version N/A
Topic Category geoscientificInformation
Progress N/A
Metadata Date 2025-07-10T20:03:30.873226
Metadata Record Identifier edu.ucar.opensky::articles:27085
Metadata Language eng; USA
Suggested Citation Lewis-Merritt, C., Stachnik, J. P., Hollis, M. A., Martin, E. R., McCrary, Rachel. (2024). A global climatology of diabatic heating in Tropical Easterly Waves. UCAR/NCAR - Library. https://n2t.org/ark:/85065/d7xg9w9j. Accessed 02 August 2025.

Harvest Source