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A Spectral Rotary Analysis of Gravity Waves: An Application During One of the SOUTHTRAC Flights.

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Title: A Spectral Rotary Analysis of Gravity Waves: An Application During One of the SOUTHTRAC Flights.
Authors: de la Torre, A.1 (AUTHOR) adelatorre@austral.edu.ar, Alexander, P.2 (AUTHOR), Marcos, T.1 (AUTHOR), Hierro, R.1 (AUTHOR), Llamedo, P.1 (AUTHOR), Hormaechea, J. L.3 (AUTHOR), Preusse, P.4 (AUTHOR), Geldenhuys, M.4,5 (AUTHOR), Krasauskas, L.4 (AUTHOR), Giez, A.6 (AUTHOR), Kaifler, B.7 (AUTHOR), Kaifler, N.7 (AUTHOR), Rapp, M.7,8 (AUTHOR)
Source: Journal of Geophysical Research. Atmospheres. 1/16/2023, Vol. 128 Issue 1, p1-27. 27p.
Subject Terms: *Middle atmosphere, Gravity waves, Wave analysis, Wave packets, Atmospheric boundary layer, Rotational motion, Rotation of the earth
Geographic Terms: Patagonia (Argentina & Chile), South America
Abstract: To understand the main orographic and non‐orographic sources of gravity waves (GWs) over South America during an Experiment (Rapp et al., 2021, https://doi.org/10.1175/BAMS-D-20-0034.1), we propose the application of a rotational spectral analysis based on methods originally developed for oceanographic studies. This approach is deployed in a complex scenario of large‐amplitude GWs by applying it to reanalysis data. We divide the atmospheric region of interest into two height intervals. The simulations are compared with lidar measurements during one of the flights. From the degree of polarization and the total energy of the GWs, the contribution of the upward and downward wave packets is described as a function of their vertical wavenumbers. At low levels, a larger downward energy flux is observed in a few significant harmonics, suggesting inertial GWs radiated at polar night jet levels, and below, near to a cold front. In contrast, the upward GW energy flux, per unit area, is larger than the downward flux, as expected over mountainous areas. The main sub‐regions of upward GW energy flux are located above Patagonia, the Antarctic Peninsula and only some oceanic sectors. Above the sea, there are alternating sub‐regions dominated by linearly polarized GWs and sectors of downward GWs. At the upper levels, the total available GW energy per unit mass is higher than at the lower levels. Regions with different degrees of polarization are distributed in elongated bands. A satisfactory comparison is made with an analysis based on the phase difference between temperature and vertical wind disturbances. Plain Language Summary: Atmospheric gravity waves (GWs) are of great importance in the transport of energy and momentum through the atmosphere. Their sources can be broadly classified as stationary and non‐stationary. The southern tip of South America represents one of the most important natural laboratories for detecting the coexistence of large‐amplitude GWs. We present a spectral method to establish a semi‐quantitative classification of the different groups of GWs and their main vertical direction of propagation. We apply the method on the basis of global model data. We divide the lower and middle atmosphere into two vertical intervals and compare the model with data from one of the instruments deployed during the experiment. Based on the direction of rotation of the vector defined by the GW oscillations of the two horizontal wind components, we describe the net contribution of the upward and downward wave packets as a function of their spectral harmonics. The main sub‐regions of upward GW energy flux alternate with sub‐regions dominated by linearly polarized GWs and downward GW sectors mainly above the ocean. At the upper levels, the total available GW energy per unit mass is higher than at the lower levels. A comparison is made between these results and an independent analysis based on the known polarization relations for GWs. Key Points: A rotary spectral analysis is proposed to classify possible sources of gravity waves (GWs) according to their degree of polarizationFrom reanalysis data, the method is applied at a selected position during one of the flights of the SOUTHTRAC‐GW ExperimentUpward and downward GW structures from orographic and non‐orographic origin with different degrees of polarization are observed [ABSTRACT FROM AUTHOR]
Copyright of Journal of Geophysical Research. Atmospheres is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
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  Data: A Spectral Rotary Analysis of Gravity Waves: An Application During One of the SOUTHTRAC Flights.
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  Data: <searchLink fieldCode="AR" term="%22de+la+Torre%2C+A%2E%22">de la Torre, A.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> adelatorre@austral.edu.ar</i><br /><searchLink fieldCode="AR" term="%22Alexander%2C+P%2E%22">Alexander, P.</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Marcos%2C+T%2E%22">Marcos, T.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hierro%2C+R%2E%22">Hierro, R.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Llamedo%2C+P%2E%22">Llamedo, P.</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Hormaechea%2C+J%2E+L%2E%22">Hormaechea, J. L.</searchLink><relatesTo>3</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Preusse%2C+P%2E%22">Preusse, P.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Geldenhuys%2C+M%2E%22">Geldenhuys, M.</searchLink><relatesTo>4,5</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Krasauskas%2C+L%2E%22">Krasauskas, L.</searchLink><relatesTo>4</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Giez%2C+A%2E%22">Giez, A.</searchLink><relatesTo>6</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kaifler%2C+B%2E%22">Kaifler, B.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Kaifler%2C+N%2E%22">Kaifler, N.</searchLink><relatesTo>7</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Rapp%2C+M%2E%22">Rapp, M.</searchLink><relatesTo>7,8</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Geophysical+Research%2E+Atmospheres%22">Journal of Geophysical Research. Atmospheres</searchLink>. 1/16/2023, Vol. 128 Issue 1, p1-27. 27p.
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  Label: Subject Terms
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  Data: *<searchLink fieldCode="DE" term="%22Middle+atmosphere%22">Middle atmosphere</searchLink><br /><searchLink fieldCode="DE" term="%22Gravity+waves%22">Gravity waves</searchLink><br /><searchLink fieldCode="DE" term="%22Wave+analysis%22">Wave analysis</searchLink><br /><searchLink fieldCode="DE" term="%22Wave+packets%22">Wave packets</searchLink><br /><searchLink fieldCode="DE" term="%22Atmospheric+boundary+layer%22">Atmospheric boundary layer</searchLink><br /><searchLink fieldCode="DE" term="%22Rotational+motion%22">Rotational motion</searchLink><br /><searchLink fieldCode="DE" term="%22Rotation+of+the+earth%22">Rotation of the earth</searchLink>
– Name: SubjectGeographic
  Label: Geographic Terms
  Group: Su
  Data: <searchLink fieldCode="DE" term="%22Patagonia+%28Argentina+%26+Chile%29%22">Patagonia (Argentina & Chile)</searchLink><br /><searchLink fieldCode="DE" term="%22South+America%22">South America</searchLink>
– Name: Abstract
  Label: Abstract
  Group: Ab
  Data: To understand the main orographic and non‐orographic sources of gravity waves (GWs) over South America during an Experiment (Rapp et al., 2021, https://doi.org/10.1175/BAMS-D-20-0034.1), we propose the application of a rotational spectral analysis based on methods originally developed for oceanographic studies. This approach is deployed in a complex scenario of large‐amplitude GWs by applying it to reanalysis data. We divide the atmospheric region of interest into two height intervals. The simulations are compared with lidar measurements during one of the flights. From the degree of polarization and the total energy of the GWs, the contribution of the upward and downward wave packets is described as a function of their vertical wavenumbers. At low levels, a larger downward energy flux is observed in a few significant harmonics, suggesting inertial GWs radiated at polar night jet levels, and below, near to a cold front. In contrast, the upward GW energy flux, per unit area, is larger than the downward flux, as expected over mountainous areas. The main sub‐regions of upward GW energy flux are located above Patagonia, the Antarctic Peninsula and only some oceanic sectors. Above the sea, there are alternating sub‐regions dominated by linearly polarized GWs and sectors of downward GWs. At the upper levels, the total available GW energy per unit mass is higher than at the lower levels. Regions with different degrees of polarization are distributed in elongated bands. A satisfactory comparison is made with an analysis based on the phase difference between temperature and vertical wind disturbances. Plain Language Summary: Atmospheric gravity waves (GWs) are of great importance in the transport of energy and momentum through the atmosphere. Their sources can be broadly classified as stationary and non‐stationary. The southern tip of South America represents one of the most important natural laboratories for detecting the coexistence of large‐amplitude GWs. We present a spectral method to establish a semi‐quantitative classification of the different groups of GWs and their main vertical direction of propagation. We apply the method on the basis of global model data. We divide the lower and middle atmosphere into two vertical intervals and compare the model with data from one of the instruments deployed during the experiment. Based on the direction of rotation of the vector defined by the GW oscillations of the two horizontal wind components, we describe the net contribution of the upward and downward wave packets as a function of their spectral harmonics. The main sub‐regions of upward GW energy flux alternate with sub‐regions dominated by linearly polarized GWs and downward GW sectors mainly above the ocean. At the upper levels, the total available GW energy per unit mass is higher than at the lower levels. A comparison is made between these results and an independent analysis based on the known polarization relations for GWs. Key Points: A rotary spectral analysis is proposed to classify possible sources of gravity waves (GWs) according to their degree of polarizationFrom reanalysis data, the method is applied at a selected position during one of the flights of the SOUTHTRAC‐GW ExperimentUpward and downward GW structures from orographic and non‐orographic origin with different degrees of polarization are observed [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Geophysical Research. Atmospheres is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
PLink https://search.ebscohost.com/login.aspx?direct=true&site=eds-live&db=8gh&AN=161213170
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      – Type: doi
        Value: 10.1029/2022JD037139
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      – Code: eng
        Text: English
    PhysicalDescription:
      Pagination:
        PageCount: 27
        StartPage: 1
    Subjects:
      – SubjectFull: Middle atmosphere
        Type: general
      – SubjectFull: Gravity waves
        Type: general
      – SubjectFull: Wave analysis
        Type: general
      – SubjectFull: Wave packets
        Type: general
      – SubjectFull: Atmospheric boundary layer
        Type: general
      – SubjectFull: Rotational motion
        Type: general
      – SubjectFull: Rotation of the earth
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      – SubjectFull: Patagonia (Argentina & Chile)
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      – SubjectFull: South America
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              Text: 1/16/2023
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