TY - JOUR
T1 - Momentum Flux Spectra of a Mountain Wave Event Over New Zealand
AU - Bossert, Katrina
AU - Fritts, David C.
AU - Heale, Christopher J.
AU - Eckermann, Stephen D.
AU - Plane, John M.C.
AU - Snively, Jonathan B.
AU - Williams, Bifford P.
AU - Reid, Iain M.
AU - Murphy, Damian J.
AU - Spargo, Andrew J.
AU - MacKinnon, Andrew D.
N1 - Funding Information:
Research reported here was made possible via NSF funding (grants AGS1524598, AGS1338646, AGS1445783, and AGS1151746) acknowledged in GEMS. We acknowledge the generous support of the Chief of Naval Research via the base 6.1, 6.2, and platform support programs. Generation of NAVGEM reanalysis was made possible by the DoD High Performance Computer Modernization Program via grants of computer time at the Navy DoD Supercomputing Resource Center. The Na modeling work was supported by the European Research Council (project 291332-CODITA). Installation and operation of the Kingston radar were supported through Australian Antarctic Science project 4025 and by ATRAD Pty Ltd. We also acknowledge major support by the NCAR/EOL team who made these airborne GV measurements possible. DEEPWAVE data are archived and maintained by NCAR and can be accessed at https://www.eol.ucar.edu/ field_projects/deepwave.
Funding Information:
Research reported here was made possible via NSF funding (grants AGS1524598, AGS1338646, AGS1445783, and AGS1151746) acknowledged in GEMS. We acknowledge the generous support of the Chief of Naval Research via the base 6.1, 6.2, and platform support programs. Generation of NAVGEM reanalysis was made possible by the DoD High Performance Computer Modernization Program via grants of computer time at the Navy DoD Supercomputing Resource Center. The Na modeling work was supported by the European Research Council (project 291332-CODITA). Installation and operation of the Kingston radar were supported through Australian Antarctic Science project 4025 and by ATRAD Pty Ltd. We also acknowledge major support by the NCAR/EOL team who made these airborne GV measurements possible. DEEPWAVE data are archived and maintained by NCAR and can be accessed at https://www.eol.ucar.edu/field_projects/deepwave.
Publisher Copyright:
©2018. American Geophysical Union. All Rights Reserved.
PY - 2018/9/27
Y1 - 2018/9/27
N2 - During the Deep Propagating Gravity Wave Experiment (DEEPWAVE) 13 July 2014 research flight over the South Island of New Zealand, a multiscale spectrum of mountain waves (MWs) was observed. High-resolution measurements of sodium densities were available from ~70 to 100 km for the duration of this flight. A comprehensive technique is presented for obtaining temperature perturbations, T′, from sodium mixing ratios over a range of altitudes, and these T′ were used to calculate the momentum flux (MF) spectra with respect to horizontal wavelengths, λH, for each flight segment. Spectral analysis revealed MWs with spectral power centered at λH of ~80, 120, and 220 km. The temperature amplitudes of these MWs varied between the four cross-mountain flight legs occurring between 6:10UT and 9:10UT. The average spectral T′ amplitudes near 80 km in altitude ranged from 7–13 K for the 220 km λH MW and 4–8 K for the smaller λH MWs. These amplitudes decayed significantly up to 90 km, where a critical level for MWs was present. The average MF per unit mass near 80 km in altitude ranged from ~13 to 60 m2/s2 across the varying spectra over the duration of the research flight and decayed to ~0 by 88 km in altitude. These MFs are large compared to zonal means and highlight the importance of MWs in the momentum budget of the mesosphere and lower thermosphere at times when they reach these altitudes.
AB - During the Deep Propagating Gravity Wave Experiment (DEEPWAVE) 13 July 2014 research flight over the South Island of New Zealand, a multiscale spectrum of mountain waves (MWs) was observed. High-resolution measurements of sodium densities were available from ~70 to 100 km for the duration of this flight. A comprehensive technique is presented for obtaining temperature perturbations, T′, from sodium mixing ratios over a range of altitudes, and these T′ were used to calculate the momentum flux (MF) spectra with respect to horizontal wavelengths, λH, for each flight segment. Spectral analysis revealed MWs with spectral power centered at λH of ~80, 120, and 220 km. The temperature amplitudes of these MWs varied between the four cross-mountain flight legs occurring between 6:10UT and 9:10UT. The average spectral T′ amplitudes near 80 km in altitude ranged from 7–13 K for the 220 km λH MW and 4–8 K for the smaller λH MWs. These amplitudes decayed significantly up to 90 km, where a critical level for MWs was present. The average MF per unit mass near 80 km in altitude ranged from ~13 to 60 m2/s2 across the varying spectra over the duration of the research flight and decayed to ~0 by 88 km in altitude. These MFs are large compared to zonal means and highlight the importance of MWs in the momentum budget of the mesosphere and lower thermosphere at times when they reach these altitudes.
KW - DEEPWAVE
KW - gravity waves
KW - momentum flux
KW - mountain waves
UR - http://www.scopus.com/inward/record.url?scp=85051295880&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85051295880&partnerID=8YFLogxK
U2 - 10.1029/2018JD028319
DO - 10.1029/2018JD028319
M3 - Article
AN - SCOPUS:85051295880
SN - 2169-897X
VL - 123
SP - 9980
EP - 9991
JO - Journal of Geophysical Research: Atmospheres
JF - Journal of Geophysical Research: Atmospheres
IS - 18
ER -