Jupiter's North Equatorial Belt expansion and thermal wave activity ahead of Juno's arrival

L. N. Fletcher; G. S. Orton; J. A. Sinclair; P. Donnelly; H. Melin; J. H. Rogers; T. K. Greathouse; Y. Kasaba; T. Fujiyoshi; T. M. Sato; J. Fernandes; P. G.J. Irwin; R. S. Giles; A. A. Simon; M. H. Wong; M. Vedovato

doi:10.1002/2017GL073383

Jupiter's North Equatorial Belt expansion and thermal wave activity ahead of Juno's arrival

L. N. Fletcher, G. S. Orton, J. A. Sinclair, P. Donnelly, H. Melin, J. H. Rogers, T. K. Greathouse, Y. Kasaba, T. Fujiyoshi, T. M. Sato, J. Fernandes, P. G.J. Irwin, R. S. Giles, A. A. Simon, M. H. Wong, M. Vedovato

SCI - Geophysics

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

The dark colors of Jupiter's North Equatorial Belt (NEB, 7–17°N) appeared to expand northward into the neighboring zone in 2015, consistent with a 3–5 year cycle. Inversions of thermal-IR imaging from the Very Large Telescope revealed a moderate warming and reduction of aerosol opacity at the cloud tops at 17–20°N, suggesting subsidence and drying in the expanded sector. Two new thermal waves were identified during this period: (i) an upper tropospheric thermal wave (wave number 16–17, amplitude 2.5 K at 170 mbar) in the mid-NEB that was anticorrelated with haze reflectivity; and (ii) a stratospheric wave (wave number 13–14, amplitude 7.3 K at 5 mbar) at 20–30°N. Both were quasi-stationary, confined to regions of eastward zonal flow, and are morphologically similar to waves observed during previous expansion events.

Original language	English
Pages (from-to)	7140-7148
Number of pages	9
Journal	Geophysical Research Letters
Volume	44
Issue number	14
DOIs	https://doi.org/10.1002/2017GL073383
Publication status	Published - 2017 Jul 28

Keywords

Jupiter
atmospheres, chemistry
atmospheres, dynamics
infrared
remote sensing

ASJC Scopus subject areas

Geophysics
Earth and Planetary Sciences(all)

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10.1002/2017GL073383

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Fletcher, L. N., Orton, G. S., Sinclair, J. A., Donnelly, P., Melin, H., Rogers, J. H., Greathouse, T. K., Kasaba, Y., Fujiyoshi, T., Sato, T. M., Fernandes, J., Irwin, P. G. J., Giles, R. S., Simon, A. A., Wong, M. H., & Vedovato, M. (2017). Jupiter's North Equatorial Belt expansion and thermal wave activity ahead of Juno's arrival. Geophysical Research Letters, 44(14), 7140-7148. https://doi.org/10.1002/2017GL073383

Jupiter's North Equatorial Belt expansion and thermal wave activity ahead of Juno's arrival. / Fletcher, L. N.; Orton, G. S.; Sinclair, J. A.; Donnelly, P.; Melin, H.; Rogers, J. H.; Greathouse, T. K.; Kasaba, Y.; Fujiyoshi, T.; Sato, T. M.; Fernandes, J.; Irwin, P. G.J.; Giles, R. S.; Simon, A. A.; Wong, M. H.; Vedovato, M.

In: Geophysical Research Letters, Vol. 44, No. 14, 28.07.2017, p. 7140-7148.

Research output: Contribution to journal › Article › peer-review

Fletcher, LN, Orton, GS, Sinclair, JA, Donnelly, P, Melin, H, Rogers, JH, Greathouse, TK, Kasaba, Y, Fujiyoshi, T, Sato, TM, Fernandes, J, Irwin, PGJ, Giles, RS, Simon, AA, Wong, MH & Vedovato, M 2017, 'Jupiter's North Equatorial Belt expansion and thermal wave activity ahead of Juno's arrival', Geophysical Research Letters, vol. 44, no. 14, pp. 7140-7148. https://doi.org/10.1002/2017GL073383

Fletcher, L. N. ; Orton, G. S. ; Sinclair, J. A. ; Donnelly, P. ; Melin, H. ; Rogers, J. H. ; Greathouse, T. K. ; Kasaba, Y. ; Fujiyoshi, T. ; Sato, T. M. ; Fernandes, J. ; Irwin, P. G.J. ; Giles, R. S. ; Simon, A. A. ; Wong, M. H. ; Vedovato, M. / Jupiter's North Equatorial Belt expansion and thermal wave activity ahead of Juno's arrival. In: Geophysical Research Letters. 2017 ; Vol. 44, No. 14. pp. 7140-7148.

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abstract = "The dark colors of Jupiter's North Equatorial Belt (NEB, 7–17°N) appeared to expand northward into the neighboring zone in 2015, consistent with a 3–5 year cycle. Inversions of thermal-IR imaging from the Very Large Telescope revealed a moderate warming and reduction of aerosol opacity at the cloud tops at 17–20°N, suggesting subsidence and drying in the expanded sector. Two new thermal waves were identified during this period: (i) an upper tropospheric thermal wave (wave number 16–17, amplitude 2.5 K at 170 mbar) in the mid-NEB that was anticorrelated with haze reflectivity; and (ii) a stratospheric wave (wave number 13–14, amplitude 7.3 K at 5 mbar) at 20–30°N. Both were quasi-stationary, confined to regions of eastward zonal flow, and are morphologically similar to waves observed during previous expansion events.",

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AU - Irwin, P. G.J.

AU - Giles, R. S.

AU - Simon, A. A.

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Jupiter's North Equatorial Belt expansion and thermal wave activity ahead of Juno's arrival

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