Longitude variability of the solar semidiurnal tide in the lower thermosphere through assimilation of ground- and space-based wind measurements

K. M. Cierpik, J. M. Forbes, S. Miyahara, Yasunobu Miyoshi, A. Fahmtdinova, C. Jacobi, A. Manson, C. Meek, N. J. Mitchell, Y. Portnyagin

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

Wind measurements from the Upper Atmosphere Research Satellite (UARS) and model output from the Middle Atmosphere General Circulation Model (GCM) at Kyushu University are used to investigate the nature of nonmigrating semidiurnal tides between 50-55°N using combined space-based (SBM) and ground-based (GBM) wind measurements at 95 km. The GCM is used to create a mock database to test the effects of various sampling scenarios, data gaps, and relative weighting between SBM and GBM, on retrieval of the longitude structure of the semidiurnal tide. SB sampling is based upon orbital characteristics of UARS. GB sampling corresponds to hourly radar measurements from Saskatoon (52°N, 107°W), Sheffield (53°N, 4°W), Collm (52°N, 15°E), Obninsk (55°N, 37°E), and Kazan (56°N, 49°E). Results are presented for the month of August when semidiurnal amplitudes are large and sampling by UARS instruments is good. By compositing over a 5-10 day "fit span," it is found that the combination of temporal coverage by GB radars and spatial sampling by the satellite is sufficient to allow reasonable recovery of the zonal wave number s = 1,2,3 components of the semidiurnal tide. Over significantly longer fit spans, the contributions of GBM become less critical. Using actual UARS and GBM during 1-20 August 1993, the semidiurnal amplitude of eastward wind is found to vary from a minimum value (12 ms-1) at 20°E, to a maximum of 45 ms-1 near 160°E, and a secondary maximum (29 ms-1) at 300°E. The zonal wave number components corresponding to this longitude variation in the semidiurnal tide are 7.7 ± 1.9 ms-1, 19.8 ± 1.5 ms-1 and 13.0 ± 1.3 ms-1 for s = 1, 2, 3 (westward), respectively where ±1- σuncertainties are indicated. These results are in reasonable agreement with those simulated within the Kyushu GCM. However, there is roughly a four- to five-hour phase offset between the phases recovered from the observational data and from the Kyushu GCM, possibly connected with strong model phase gradients in this atmospheric regime.

Original languageEnglish
JournalJournal of Geophysical Research: Space Physics
Volume108
Issue numberA5
DOIs
Publication statusPublished - Jan 1 2003

Fingerprint

wind measurement
semidiurnal tide
thermosphere
Tides
assimilation
longitude
tides
UARS
General Circulation Models
Upper Atmosphere Research Satellite (UARS)
Upper atmosphere
general circulation model
Satellites
Sampling
sampling
Japan
radar
data sampling
satellite instruments
middle atmosphere

All Science Journal Classification (ASJC) codes

  • Geophysics
  • Forestry
  • Oceanography
  • Aquatic Science
  • Ecology
  • Water Science and Technology
  • Soil Science
  • Geochemistry and Petrology
  • Earth-Surface Processes
  • Atmospheric Science
  • Earth and Planetary Sciences (miscellaneous)
  • Space and Planetary Science
  • Palaeontology

Cite this

Longitude variability of the solar semidiurnal tide in the lower thermosphere through assimilation of ground- and space-based wind measurements. / Cierpik, K. M.; Forbes, J. M.; Miyahara, S.; Miyoshi, Yasunobu; Fahmtdinova, A.; Jacobi, C.; Manson, A.; Meek, C.; Mitchell, N. J.; Portnyagin, Y.

In: Journal of Geophysical Research: Space Physics, Vol. 108, No. A5, 01.01.2003.

Research output: Contribution to journalArticle

Cierpik, K. M. ; Forbes, J. M. ; Miyahara, S. ; Miyoshi, Yasunobu ; Fahmtdinova, A. ; Jacobi, C. ; Manson, A. ; Meek, C. ; Mitchell, N. J. ; Portnyagin, Y. / Longitude variability of the solar semidiurnal tide in the lower thermosphere through assimilation of ground- and space-based wind measurements. In: Journal of Geophysical Research: Space Physics. 2003 ; Vol. 108, No. A5.
@article{7cc1b15eb2564a8f8431f128d4f46b12,
title = "Longitude variability of the solar semidiurnal tide in the lower thermosphere through assimilation of ground- and space-based wind measurements",
abstract = "Wind measurements from the Upper Atmosphere Research Satellite (UARS) and model output from the Middle Atmosphere General Circulation Model (GCM) at Kyushu University are used to investigate the nature of nonmigrating semidiurnal tides between 50-55°N using combined space-based (SBM) and ground-based (GBM) wind measurements at 95 km. The GCM is used to create a mock database to test the effects of various sampling scenarios, data gaps, and relative weighting between SBM and GBM, on retrieval of the longitude structure of the semidiurnal tide. SB sampling is based upon orbital characteristics of UARS. GB sampling corresponds to hourly radar measurements from Saskatoon (52°N, 107°W), Sheffield (53°N, 4°W), Collm (52°N, 15°E), Obninsk (55°N, 37°E), and Kazan (56°N, 49°E). Results are presented for the month of August when semidiurnal amplitudes are large and sampling by UARS instruments is good. By compositing over a 5-10 day {"}fit span,{"} it is found that the combination of temporal coverage by GB radars and spatial sampling by the satellite is sufficient to allow reasonable recovery of the zonal wave number s = 1,2,3 components of the semidiurnal tide. Over significantly longer fit spans, the contributions of GBM become less critical. Using actual UARS and GBM during 1-20 August 1993, the semidiurnal amplitude of eastward wind is found to vary from a minimum value (12 ms-1) at 20°E, to a maximum of 45 ms-1 near 160°E, and a secondary maximum (29 ms-1) at 300°E. The zonal wave number components corresponding to this longitude variation in the semidiurnal tide are 7.7 ± 1.9 ms-1, 19.8 ± 1.5 ms-1 and 13.0 ± 1.3 ms-1 for s = 1, 2, 3 (westward), respectively where ±1- σuncertainties are indicated. These results are in reasonable agreement with those simulated within the Kyushu GCM. However, there is roughly a four- to five-hour phase offset between the phases recovered from the observational data and from the Kyushu GCM, possibly connected with strong model phase gradients in this atmospheric regime.",
author = "Cierpik, {K. M.} and Forbes, {J. M.} and S. Miyahara and Yasunobu Miyoshi and A. Fahmtdinova and C. Jacobi and A. Manson and C. Meek and Mitchell, {N. J.} and Y. Portnyagin",
year = "2003",
month = "1",
day = "1",
doi = "10.1029/2002JA009349",
language = "English",
volume = "108",
journal = "Journal of Geophysical Research",
issn = "0148-0227",
number = "A5",

}

TY - JOUR

T1 - Longitude variability of the solar semidiurnal tide in the lower thermosphere through assimilation of ground- and space-based wind measurements

AU - Cierpik, K. M.

AU - Forbes, J. M.

AU - Miyahara, S.

AU - Miyoshi, Yasunobu

AU - Fahmtdinova, A.

AU - Jacobi, C.

AU - Manson, A.

AU - Meek, C.

AU - Mitchell, N. J.

AU - Portnyagin, Y.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - Wind measurements from the Upper Atmosphere Research Satellite (UARS) and model output from the Middle Atmosphere General Circulation Model (GCM) at Kyushu University are used to investigate the nature of nonmigrating semidiurnal tides between 50-55°N using combined space-based (SBM) and ground-based (GBM) wind measurements at 95 km. The GCM is used to create a mock database to test the effects of various sampling scenarios, data gaps, and relative weighting between SBM and GBM, on retrieval of the longitude structure of the semidiurnal tide. SB sampling is based upon orbital characteristics of UARS. GB sampling corresponds to hourly radar measurements from Saskatoon (52°N, 107°W), Sheffield (53°N, 4°W), Collm (52°N, 15°E), Obninsk (55°N, 37°E), and Kazan (56°N, 49°E). Results are presented for the month of August when semidiurnal amplitudes are large and sampling by UARS instruments is good. By compositing over a 5-10 day "fit span," it is found that the combination of temporal coverage by GB radars and spatial sampling by the satellite is sufficient to allow reasonable recovery of the zonal wave number s = 1,2,3 components of the semidiurnal tide. Over significantly longer fit spans, the contributions of GBM become less critical. Using actual UARS and GBM during 1-20 August 1993, the semidiurnal amplitude of eastward wind is found to vary from a minimum value (12 ms-1) at 20°E, to a maximum of 45 ms-1 near 160°E, and a secondary maximum (29 ms-1) at 300°E. The zonal wave number components corresponding to this longitude variation in the semidiurnal tide are 7.7 ± 1.9 ms-1, 19.8 ± 1.5 ms-1 and 13.0 ± 1.3 ms-1 for s = 1, 2, 3 (westward), respectively where ±1- σuncertainties are indicated. These results are in reasonable agreement with those simulated within the Kyushu GCM. However, there is roughly a four- to five-hour phase offset between the phases recovered from the observational data and from the Kyushu GCM, possibly connected with strong model phase gradients in this atmospheric regime.

AB - Wind measurements from the Upper Atmosphere Research Satellite (UARS) and model output from the Middle Atmosphere General Circulation Model (GCM) at Kyushu University are used to investigate the nature of nonmigrating semidiurnal tides between 50-55°N using combined space-based (SBM) and ground-based (GBM) wind measurements at 95 km. The GCM is used to create a mock database to test the effects of various sampling scenarios, data gaps, and relative weighting between SBM and GBM, on retrieval of the longitude structure of the semidiurnal tide. SB sampling is based upon orbital characteristics of UARS. GB sampling corresponds to hourly radar measurements from Saskatoon (52°N, 107°W), Sheffield (53°N, 4°W), Collm (52°N, 15°E), Obninsk (55°N, 37°E), and Kazan (56°N, 49°E). Results are presented for the month of August when semidiurnal amplitudes are large and sampling by UARS instruments is good. By compositing over a 5-10 day "fit span," it is found that the combination of temporal coverage by GB radars and spatial sampling by the satellite is sufficient to allow reasonable recovery of the zonal wave number s = 1,2,3 components of the semidiurnal tide. Over significantly longer fit spans, the contributions of GBM become less critical. Using actual UARS and GBM during 1-20 August 1993, the semidiurnal amplitude of eastward wind is found to vary from a minimum value (12 ms-1) at 20°E, to a maximum of 45 ms-1 near 160°E, and a secondary maximum (29 ms-1) at 300°E. The zonal wave number components corresponding to this longitude variation in the semidiurnal tide are 7.7 ± 1.9 ms-1, 19.8 ± 1.5 ms-1 and 13.0 ± 1.3 ms-1 for s = 1, 2, 3 (westward), respectively where ±1- σuncertainties are indicated. These results are in reasonable agreement with those simulated within the Kyushu GCM. However, there is roughly a four- to five-hour phase offset between the phases recovered from the observational data and from the Kyushu GCM, possibly connected with strong model phase gradients in this atmospheric regime.

UR - http://www.scopus.com/inward/record.url?scp=84905330440&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84905330440&partnerID=8YFLogxK

U2 - 10.1029/2002JA009349

DO - 10.1029/2002JA009349

M3 - Article

AN - SCOPUS:84905330440

VL - 108

JO - Journal of Geophysical Research

JF - Journal of Geophysical Research

SN - 0148-0227

IS - A5

ER -