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Title: Two-Day Westward-Propagating Inertio-Gravity Waves during GoAmazon

Abstract

The dynamical and thermodynamical features of Amazonian 2-day westward-propagating inertia–gravity (WIG) waves are examined. On the basis of a linear regression analysis of satellite brightness temperature and data from the 2014–15 Observations and Modeling of the Green Ocean Amazon (GoAmazon) field campaign, it is shown that Amazonian WIG waves exhibit structure and propagation characteristics consistent with the n = 1 WIG waves from shallow water theory. These WIG waves exhibit a pronounced seasonality, with peak activity occurring from March to May and a minimum occurring from June to September. Evidence is shown that mesoscale convective systems over the Amazon are frequently organized in 2-day WIG waves. Results suggest that many of the Amazonian WIG waves come from preexisting 2-day waves over the Atlantic, which slow down when coupled with the deeper, more intense convection over tropical South America. In contrast to WIG waves that occur over the ocean, Amazonian 2-day WIG waves exhibit a pronounced signature in surface temperature, moisture, and heat fluxes.

Authors:
 [1];  [2]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Univ. of Wisconsin, Madison, WI (United States)
Publication Date:
Research Org.:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Atmospheric Radiation Measurement (ARM) Data Center
Sponsoring Org.:
USDOE Office of Science (SC), Biological and Environmental Research (BER)
Contributing Org.:
Pacific Northwest National Laboratory (PNNL); Brookhaven National Laboratory (BNL); Argonne National Laboratory (ANL); Oak Ridge National Laboratory (ORNL)
OSTI Identifier:
1829269
Grant/Contract Number:  
AC05-76RL01830
Resource Type:
Accepted Manuscript
Journal Name:
Journal of the Atmospheric Sciences
Additional Journal Information:
Journal Volume: 78; Journal Issue: 11; Journal ID: ISSN 0022-4928
Publisher:
American Meteorological Society
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; Surface fluxes; Gravity waves; Inertia-gravity waves; Tropical variability

Citation Formats

Mayta, Victor C., and Adames, Ángel F. Two-Day Westward-Propagating Inertio-Gravity Waves during GoAmazon. United States: N. p., 2021. Web. doi:10.1175/jas-d-20-0358.1.
Mayta, Victor C., & Adames, Ángel F. Two-Day Westward-Propagating Inertio-Gravity Waves during GoAmazon. United States. https://doi.org/10.1175/jas-d-20-0358.1
Mayta, Victor C., and Adames, Ángel F. Mon . "Two-Day Westward-Propagating Inertio-Gravity Waves during GoAmazon". United States. https://doi.org/10.1175/jas-d-20-0358.1. https://www.osti.gov/servlets/purl/1829269.
@article{osti_1829269,
title = {Two-Day Westward-Propagating Inertio-Gravity Waves during GoAmazon},
author = {Mayta, Victor C. and Adames, Ángel F.},
abstractNote = {The dynamical and thermodynamical features of Amazonian 2-day westward-propagating inertia–gravity (WIG) waves are examined. On the basis of a linear regression analysis of satellite brightness temperature and data from the 2014–15 Observations and Modeling of the Green Ocean Amazon (GoAmazon) field campaign, it is shown that Amazonian WIG waves exhibit structure and propagation characteristics consistent with the n = 1 WIG waves from shallow water theory. These WIG waves exhibit a pronounced seasonality, with peak activity occurring from March to May and a minimum occurring from June to September. Evidence is shown that mesoscale convective systems over the Amazon are frequently organized in 2-day WIG waves. Results suggest that many of the Amazonian WIG waves come from preexisting 2-day waves over the Atlantic, which slow down when coupled with the deeper, more intense convection over tropical South America. In contrast to WIG waves that occur over the ocean, Amazonian 2-day WIG waves exhibit a pronounced signature in surface temperature, moisture, and heat fluxes.},
doi = {10.1175/jas-d-20-0358.1},
journal = {Journal of the Atmospheric Sciences},
number = 11,
volume = 78,
place = {United States},
year = {Mon Nov 01 00:00:00 EDT 2021},
month = {Mon Nov 01 00:00:00 EDT 2021}
}

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