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Volumn 106, Issue D19, 2001, Pages 22763-22780

Role of the equatorial Kelvin wave in stratosphere-troposphere exchange in a general circulation model

Author keywords

[No Author keywords available]

Indexed keywords

EQUATORIAL WAVE; GENERAL CIRCULATION MODEL; KELVIN WAVE; OZONE; STRATOSPHERE-TROPOSPHERE INTERACTION;

EID: 0034764985     PISSN: 01480227     EISSN: None     Source Type: Journal    
DOI: 10.1029/2000JD000161     Document Type: Article
Times cited : (29)

References (58)
  • 2
    • 0024192651 scopus 로고
    • Average vertical motions in the tropical atmosphere observed by a radar wind profiler on Pohnpei (7°N latitude, 157°E longitude)
    • Balsley, B. B., W. L. Ecklund, D. A. Carter, A. C. Riddle, and K. S. Gage, Average vertical motions in the tropical atmosphere observed by a radar wind profiler on Pohnpei (7°N latitude, 157°E longitude), J. Atmos. Sci., 45, 396-405, 1988.
    • (1988) J. Atmos. Sci. , vol.45 , pp. 396-405
    • Balsley, B.B.1    Ecklund, W.L.2    Carter, D.A.3    Riddle, A.C.4    Gage, K.S.5
  • 3
    • 0033625939 scopus 로고    scopus 로고
    • Stratospheric influence on upper tropospheric tropical cirrus
    • Boehm, M. T., and J. Verlinde, Stratospheric influence on upper tropospheric tropical cirrus, Geophys. Res. Lett., 27, 3209-3212, 2000.
    • (2000) Geophys. Res. Lett. , vol.27 , pp. 3209-3212
    • Boehm, M.T.1    Verlinde, J.2
  • 4
    • 0029471940 scopus 로고
    • Middle atmosphere version of CCM2 (MACCM2): Annual cycle and interannual variability
    • Boville, B. A., Middle atmosphere version of CCM2 (MACCM2): Annual cycle and interannual variability, J. Geophys. Res., 100, 9017-9039, 1995.
    • (1995) J. Geophys. Res. , vol.100 , pp. 9017-9039
    • Boville, B.A.1
  • 5
    • 84977286530 scopus 로고
    • Evidence for a world circulation provided by the measurements of helium and water vapour distribution in the stratosphere
    • Brewer, A. W., Evidence for a world circulation provided by the measurements of helium and water vapour distribution in the stratosphere, Q. J. R. Meteorol. Soc., 75, 351-363, 1949.
    • (1949) Q. J. R. Meteorol. Soc. , vol.75 , pp. 351-363
    • Brewer, A.W.1
  • 6
    • 0029502889 scopus 로고
    • Isentropic cross-tropopause mass exchange in the extratropics
    • Chen, P., Isentropic cross-tropopause mass exchange in the extratropics, J. Geophys. Res., 100, 16,661-16,673, 1995.
    • (1995) J. Geophys. Res. , vol.100
    • Chen, P.1
  • 7
    • 0029769393 scopus 로고    scopus 로고
    • Multiscale variability of deep convection in relation to large-scale circulation in TOGA COARE
    • Chen, S. S., R. A. Houze Jr., and B. E. Mapes, Multiscale variability of deep convection in relation to large-scale circulation in TOGA COARE, J. Atmos. Sci., 53, 1380-1409, 1996.
    • (1996) J. Atmos. Sci. , vol.53 , pp. 1380-1409
    • Chen, S.S.1    Houze Jr., R.A.2    Mapes, B.E.3
  • 8
    • 0020414675 scopus 로고
    • A dehydration mechanism for the stratosphere
    • Danielsen, E. F., A dehydration mechanism for the stratosphere, Geophys. Res. Lett., 9, 605-608, 1982.
    • (1982) Geophys. Res. Lett. , vol.9 , pp. 605-608
    • Danielsen, E.F.1
  • 9
    • 0032534206 scopus 로고    scopus 로고
    • A reexamination of the "stratospheric fountain" hypothesis
    • Dessler, A. E., A reexamination of the "stratospheric fountain" hypothesis, Geophys. Res. Lett., 25, 4165-4168, 1998.
    • (1998) Geophys. Res. Lett. , vol.25 , pp. 4165-4168
    • Dessler, A.E.1
  • 10
    • 0000678938 scopus 로고
    • Origin and distribution of polyatomic molecules in the atmosphere
    • Dobson, G. M. B., Origin and distribution of polyatomic molecules in the atmosphere, Proc. R. Soc. London, Ser. A, 236, 187-193, 1956.
    • (1956) Proc. R. Soc. London, Ser. A , vol.236 , pp. 187-193
    • Dobson, G.M.B.1
  • 11
    • 0001142611 scopus 로고
    • Measurements of the amount of ozone in the Earth's atmosphere and its relation to other geophysical conditions, III
    • Dobson, G. M. B., D. N. Harrison, and J. Lawrence, Measurements of the amount of ozone in the Earth's atmosphere and its relation to other geophysical conditions, III, Proc. R. Soc. London, Ser. A, 122, 456-486, 1929.
    • (1929) Proc. R. Soc. London, Ser. A , vol.122 , pp. 456-486
    • Dobson, G.M.B.1    Harrison, D.N.2    Lawrence, J.3
  • 12
    • 0025657974 scopus 로고
    • Distribution of tropospheric ozone determined from satellite data
    • Fishman, J., C. E. Watson, J. C. Larsen, and J. A. Logan, Distribution of tropospheric ozone determined from satellite data, J. Geophys. Res., 95, 3599-3617, 1990.
    • (1990) J. Geophys. Res. , vol.95 , pp. 3599-3617
    • Fishman, J.1    Watson, C.E.2    Larsen, J.C.3    Logan, J.A.4
  • 13
    • 0032552276 scopus 로고    scopus 로고
    • Stratosphere-troposphere exchange of ozone associated with the equatorial Kelvin wave as observed with ozonesondes and rawinsondes
    • Fujiwara, M., K. Kita, and T. Ogawa, Stratosphere-troposphere exchange of ozone associated with the equatorial Kelvin wave as observed with ozonesondes and rawinsondes, J. Geophys. Res., 103, 19,173-19,182, 1998.
    • (1998) J. Geophys. Res. , vol.103
    • Fujiwara, M.1    Kita, K.2    Ogawa, T.3
  • 14
    • 0033377064 scopus 로고    scopus 로고
    • Tropospheric ozone enhancements during the Indonesian forest fire events in 1994 and in 1997 as revealed by ground-based observations
    • Fujiwara, M., K. Kita, S. Kawakami, T. Ogawa, N. Komala, S. Saraspriya, and A. Suripto, Tropospheric ozone enhancements during the Indonesian forest fire events in 1994 and in 1997 as revealed by ground-based observations, Geophys. Res. Lett., 26, 2417-2420, 1999.
    • (1999) Geophys. Res. Lett. , vol.26 , pp. 2417-2420
    • Fujiwara, M.1    Kita, K.2    Kawakami, S.3    Ogawa, T.4    Komala, N.5    Saraspriya, S.6    Suripto, A.7
  • 16
    • 0035880498 scopus 로고    scopus 로고
    • Water vapor control at the tropopause by equatorial Kelvin waves observed over the Galápagos
    • Fujiwara, M., F. Hasebe, M. Shiotani, N. Nishi, H. Vömel, and S. J. Oltmans, Water vapor control at the tropopause by equatorial Kelvin waves observed over the Galápagos, Geophys. Res. Lett., 28, 3143-3146, 2001.
    • (2001) Geophys. Res. Lett. , vol.28 , pp. 3143-3146
    • Fujiwara, M.1    Hasebe, F.2    Shiotani, M.3    Nishi, N.4    Vömel, H.5    Oltmans, S.J.6
  • 17
    • 0026295825 scopus 로고
    • Long-term mean vertical motion over the tropical Pacific: Wind-profiling Doppler radar measurements
    • Gage, K. S., J. R. McAfee, D. A. Carter, W. L. Ecklund, A. C. Riddle, G. C. Reid, and B. B. Balsley, Long-term mean vertical motion over the tropical Pacific: Wind-profiling Doppler radar measurements, Science, 254, 1771-1773, 1991.
    • (1991) Science , vol.254 , pp. 1771-1773
    • Gage, K.S.1    McAfee, J.R.2    Carter, D.A.3    Ecklund, W.L.4    Riddle, A.C.5    Reid, G.C.6    Balsley, B.B.7
  • 18
    • 0026295396 scopus 로고
    • On the "downward control" of extratropical diabatic circulation by eddy-induced mean zonal forces
    • Haynes, P. H., C. J. Marks, M. E. McIntyre, T. G. Shepherd, and K. P. Shine, On the "downward control" of extratropical diabatic circulation by eddy-induced mean zonal forces, J. Atmos. Sci., 48, 651-678, 1991.
    • (1991) J. Atmos. Sci. , vol.48 , pp. 651-678
    • Haynes, P.H.1    Marks, C.J.2    McIntyre, M.E.3    Shepherd, T.G.4    Shine, K.P.5
  • 19
    • 0021541013 scopus 로고
    • Troposphere-stratosphere exchange of trace constituents: The water vapor puzzle
    • edited by J. R. Holton and T. Matsuno, Terra Sci., Tokyo
    • Holton, J. R., Troposphere-stratosphere exchange of trace constituents: The water vapor puzzle, in Dynamics of the Middle Atmosphere, edited by J. R. Holton and T. Matsuno, pp. 369-385, Terra Sci., Tokyo, 1984.
    • (1984) Dynamics of the middle Atmosphere , pp. 369-385
    • Holton, J.R.1
  • 21
    • 0020896978 scopus 로고
    • Thermodynamic and circulation characteristics of winter monsoon tropical mesoscale convection
    • Johnson, R. H., and D. C. Kriete, Thermodynamic and circulation characteristics of winter monsoon tropical mesoscale convection, Mon. Weather Rev., 110, 1898-1911, 1982.
    • (1982) Mon. Weather Rev. , vol.110 , pp. 1898-1911
    • Johnson, R.H.1    Kriete, D.C.2
  • 23
    • 0002038618 scopus 로고
    • The easterly jet stream in the tropics
    • Koteswaram, P., The easterly jet stream in the tropics, Tellus, 10, 43-57, 1958.
    • (1958) Tellus , vol.10 , pp. 43-57
    • Koteswaram, P.1
  • 24
    • 0024907895 scopus 로고
    • Consistent vertical and horizontal resolution
    • Lindzen, R. S., and M. Fox-Rabinovitz, Consistent vertical and horizontal resolution, Mon. Weather Rev., 117, 2575-2583, 1989.
    • (1989) Mon. Weather Rev. , vol.117 , pp. 2575-2583
    • Lindzen, R.S.1    Fox-Rabinovitz, M.2
  • 25
    • 0000107799 scopus 로고
    • Description of global-scale circulation cells in the tropics with a 40-50 day period
    • Madden, R. A., and P. R. Julian, Description of global-scale circulation cells in the tropics with a 40-50 day period, J. Atmos. Sci., 29, 1109-1123, 1972.
    • (1972) J. Atmos. Sci. , vol.29 , pp. 1109-1123
    • Madden, R.A.1    Julian, P.R.2
  • 26
    • 0028571920 scopus 로고
    • Observations of the 40-50-day tropical oscillation - A review
    • Madden, R. A., and P. R. Julian, Observations of the 40-50-day tropical oscillation - A review, Mon. Weather Rev., 122, 814-837, 1994.
    • (1994) Mon. Weather Rev. , vol.122 , pp. 814-837
    • Madden, R.A.1    Julian, P.R.2
  • 27
    • 0002239315 scopus 로고
    • Quasi-geostrophic motions in the equatorial area
    • Matsuno, T., Quasi-geostrophic motions in the equatorial area, J. Meteorol. Soc. Jpn., 44, 25-43, 1966.
    • (1966) J. Meteorol. Soc. Jpn. , vol.44 , pp. 25-43
    • Matsuno, T.1
  • 28
    • 0000959924 scopus 로고
    • The effect of orographically excited gravity wave drag on the general circulation of the lower stratosphere and troposphere
    • McFarlane, N. A., The effect of orographically excited gravity wave drag on the general circulation of the lower stratosphere and troposphere, J. Atmos. Sci., 44, 1775-1800, 1987.
    • (1987) J. Atmos. Sci. , vol.44 , pp. 1775-1800
    • McFarlane, N.A.1
  • 29
    • 0021644028 scopus 로고
    • Average ozone profiles for 1979 from the Nimbus 7 SBUV instrument
    • McPeters, R. D., D. F. Heath, and P. K. Bhartia, Average ozone profiles for 1979 from the Nimbus 7 SBUV instrument, J. Geophys. Res., 89, 5199-5214, 1984.
    • (1984) J. Geophys. Res. , vol.89 , pp. 5199-5214
    • McPeters, R.D.1    Heath, D.F.2    Bhartia, P.K.3
  • 30
    • 0000265493 scopus 로고
    • A hierarchy of turbulence closure models for planetary boundary layers
    • Mellor, G. L., and T. Yamada, A hierarchy of turbulence closure models for planetary boundary layers, J. Atmos. Sci., 31, 1791-1806, 1974.
    • (1974) J. Atmos. Sci. , vol.31 , pp. 1791-1806
    • Mellor, G.L.1    Yamada, T.2
  • 32
    • 0033793784 scopus 로고    scopus 로고
    • Intraseasonal variations of water vapor in the tropical upper troposphere and tropopause region
    • Mote, P. W., H. L. Clark, T. J. Dunkerton, R. S. Harwood, and H. C. Pumphrey, Intraseasonal variations of water vapor in the tropical upper troposphere and tropopause region, J. Geophys. Res., 105, 17,457-17,470, 2000.
    • (2000) J. Geophys. Res. , vol.105
    • Mote, P.W.1    Clark, H.L.2    Dunkerton, T.J.3    Harwood, R.S.4    Pumphrey, H.C.5
  • 33
    • 0032529786 scopus 로고    scopus 로고
    • The first simulation of an ozone QBO in a general circulation model
    • Nagashima, T., M. Takahashi, and F. Hasebe, The first simulation of an ozone QBO in a general circulation model, Geophys. Res. Lett., 25, 3131-3134, 1998.
    • (1998) Geophys. Res. Lett. , vol.25 , pp. 3131-3134
    • Nagashima, T.1    Takahashi, M.2    Hasebe, F.3
  • 35
    • 84988279073 scopus 로고
    • Tropical super clusters within intraseasonal variations over the western Pacific
    • Nakazawa, T., Tropical super clusters within intraseasonal variations over the western Pacific, J. Meteorol. Soc. Jpn., 66, 823-839, 1988.
    • (1988) J. Meteorol. Soc. Jpn. , vol.66 , pp. 823-839
    • Nakazawa, T.1
  • 37
    • 21344432867 scopus 로고
    • Eastward-moving disturbance near the tropopause along the equator during the TOGA COARE IOP
    • Nishi, N., and A. Sumi, Eastward-moving disturbance near the tropopause along the equator during the TOGA COARE IOP, J. Meteorol. Soc. Jpn., 73, 321-337, 1995.
    • (1995) J. Meteorol. Soc. Jpn. , vol.73 , pp. 321-337
    • Nishi, N.1    Sumi, A.2
  • 38
    • 0027839644 scopus 로고
    • Dynamics and energy balance of the Hadley circulation and the tropical precipitation zone: Significance of the distribution of evaporation
    • Numaguti, A., Dynamics and energy balance of the Hadley circulation and the tropical precipitation zone: Significance of the distribution of evaporation, J. Atmos. Sci., 50, 1874-1887, 1993.
    • (1993) J. Atmos. Sci. , vol.50 , pp. 1874-1887
    • Numaguti, A.1
  • 39
    • 0033608152 scopus 로고    scopus 로고
    • Origin and recycling processes of precipitating water over the Eurasian continent: Experiments using an atmospheric general circulation model
    • Numaguti, A., Origin and recycling processes of precipitating water over the Eurasian continent: Experiments using an atmospheric general circulation model, J. Geophys. Res., 104, 1957-1972, 1999.
    • (1999) J. Geophys. Res. , vol.104 , pp. 1957-1972
    • Numaguti, A.1
  • 41
    • 84981583957 scopus 로고
    • Equatorial Kelvin waves at 100 millibars
    • Parker, D. E., Equatorial Kelvin waves at 100 millibars, Q. J. R. Meteorol. Soc., 99, 116-129, 1973.
    • (1973) Q. J. R. Meteorol. Soc. , vol.99 , pp. 116-129
    • Parker, D.E.1
  • 42
    • 0029501018 scopus 로고
    • The role of monsoon convection in the dehydration of the lower tropical stratosphere
    • Potter, B. E., and J. R. Holton, The role of monsoon convection in the dehydration of the lower tropical stratosphere, J. Atmos. Sci., 52, 1034-1050, 1995.
    • (1995) J. Atmos. Sci. , vol.52 , pp. 1034-1050
    • Potter, B.E.1    Holton, J.R.2
  • 43
    • 0034353378 scopus 로고    scopus 로고
    • A "stratospheric drain" over the maritime continent
    • Sherwood, S. C., A "stratospheric drain" over the maritime continent, Geophys. Res. Lett., 27, 677-680, 2000.
    • (2000) Geophys. Res. Lett. , vol.27 , pp. 677-680
    • Sherwood, S.C.1
  • 44
    • 85006687235 scopus 로고
    • Annual, quasi-biennial, and El Niño-Southern Oscillation (ENSO) time-scale variations in equatorial total ozone
    • Shiotani, M., Annual, quasi-biennial, and El Niño-Southern Oscillation (ENSO) time-scale variations in equatorial total ozone, J. Geophys. Res., 97, 7625-7633, 1992.
    • (1992) J. Geophys. Res. , vol.97 , pp. 7625-7633
    • Shiotani, M.1
  • 45
    • 0028573086 scopus 로고
    • Stratospheric ozone variations in the equatorial region as seen in Stratospheric Aerosol and Gas Experiment data
    • Shiotani, M., and F. Hasebe, Stratospheric ozone variations in the equatorial region as seen in Stratospheric Aerosol and Gas Experiment data, J. Geophys. Res., 99, 14,575-14,584, 1994.
    • (1994) J. Geophys. Res. , vol.99
    • Shiotani, M.1    Hasebe, F.2
  • 46
    • 0029752985 scopus 로고    scopus 로고
    • Simulation of the stratospheric quasi-biennial oscillation using a general circulation model
    • Takahashi, M., Simulation of the stratospheric quasi-biennial oscillation using a general circulation model, Geophys. Res. Lett., 23, 661-664, 1996.
    • (1996) Geophys. Res. Lett. , vol.23 , pp. 661-664
    • Takahashi, M.1
  • 47
    • 0033134291 scopus 로고    scopus 로고
    • Simulation of the quasi-biennial oscillation in a general circulation model
    • Takahashi, M., Simulation of the quasi-biennial oscillation in a general circulation model, Geophys. Res. Lett., 26, 1307-1310, 1999.
    • (1999) Geophys. Res. Lett. , vol.26 , pp. 1307-1310
    • Takahashi, M.1
  • 48
    • 0038867416 scopus 로고    scopus 로고
    • Equatorial waves in a general circulation model simulating a quasi-biennial-oscillation
    • Takahashi, M., N. Zhao, and T. Kumakura, Equatorial waves in a general circulation model simulating a quasi-biennial-oscillation, J. Meteorol. Soc. Jpn., 75, 529-540, 1997.
    • (1997) J. Meteorol. Soc. Jpn. , vol.75 , pp. 529-540
    • Takahashi, M.1    Zhao, N.2    Kumakura, T.3
  • 49
    • 0028552163 scopus 로고
    • Radiosonde observations of equatorial atmosphere dynamics over Indonesia, 1, Equatorial waves and diurnal tides
    • Tsuda, T., Y. Murayama, H. Wiryosumarto, S. W. B. Harijono, and S. Kato, Radiosonde observations of equatorial atmosphere dynamics over Indonesia, 1, Equatorial waves and diurnal tides, J. Geophys. Res., 99, 10,491-10,505, 1994.
    • (1994) J. Geophys. Res. , vol.99
    • Tsuda, T.1    Murayama, Y.2    Wiryosumarto, H.3    Harijono, S.W.B.4    Kato, S.5
  • 50
    • 17344378704 scopus 로고    scopus 로고
    • Comment on "A reexamination of the 'stratospheric fountain' hypothesis" by A. E. Dessler
    • Vömel, H., and S. J. Oltmans, Comment on "A reexamination of the 'stratospheric fountain' hypothesis" by A. E. Dessler, Geophys. Res. Lett., 26, 2737-2738, 1999.
    • (1999) Geophys. Res. Lett. , vol.26 , pp. 2737-2738
    • Vömel, H.1    Oltmans, S.J.2
  • 51
    • 0029515492 scopus 로고
    • New evidence for the stratospheric dehydration mechanism in the equatorial Pacific
    • Vömel, H., S. J. Oltmans, D. Kley, and P. J. Crutzen, New evidence for the stratospheric dehydration mechanism in the equatorial Pacific, Geophys. Res. Lett., 22, 3235-3238, 1995.
    • (1995) Geophys. Res. Lett. , vol.22 , pp. 3235-3238
    • Vömel, H.1    Oltmans, S.J.2    Kley, D.3    Crutzen, P.J.4
  • 52
    • 0000410048 scopus 로고
    • Observational evidence of Kelvin waves in the tropical stratosphere
    • Wallace, J. M., and V. E. Kousky, Observational evidence of Kelvin waves in the tropical stratosphere, J. Atmos. Sci., 25, 900-907, 1968.
    • (1968) J. Atmos. Sci. , vol.25 , pp. 900-907
    • Wallace, J.M.1    Kousky, V.E.2
  • 53
    • 0030731405 scopus 로고    scopus 로고
    • A model for the boreal summer intraseasonal oscillation
    • Wang, B., and X. Xie, A model for the boreal summer intraseasonal oscillation, J. Atmos. Sci., 54, 72-86, 1997.
    • (1997) J. Atmos. Sci. , vol.54 , pp. 72-86
    • Wang, B.1    Xie, X.2
  • 54
    • 0030368905 scopus 로고    scopus 로고
    • A 6-year climatology of cloud occurrence frequency from Stratospheric Aerosol and Gas Experiment II observations (1985-1990)
    • Wang, P.-H., P. Minnis, M. P. McCormick, G. S. Kent, and K. M. Skeens, A 6-year climatology of cloud occurrence frequency from Stratospheric Aerosol and Gas Experiment II observations (1985-1990), J. Geophys. Res., 101, 29,407-29,429, 1996.
    • (1996) J. Geophys. Res. , vol.101
    • Wang, P.-H.1    Minnis, P.2    McCormick, M.P.3    Kent, G.S.4    Skeens, K.M.5
  • 55
    • 0033077602 scopus 로고    scopus 로고
    • Convectively coupled equatorial waves: Analysis of clouds and temperature in the wavenumber-frequency domain
    • Wheeler, M., and G. N. Kiladis, Convectively coupled equatorial waves: Analysis of clouds and temperature in the wavenumber-frequency domain, J. Atmos. Sci., 56, 374-399, 1999.
    • (1999) J. Atmos. Sci. , vol.56 , pp. 374-399
    • Wheeler, M.1    Kiladis, G.N.2
  • 56
    • 0034162615 scopus 로고    scopus 로고
    • Large-scale dynamical fields associated with convectively coupled equatorial waves
    • Wheeler, M., G. N. Kiladis, and P. J. Webster, Large-scale dynamical fields associated with convectively coupled equatorial waves, J. Atmos. Sci., 57, 613-640, 2000.
    • (2000) J. Atmos. Sci. , vol.57 , pp. 613-640
    • Wheeler, M.1    Kiladis, G.N.2    Webster, P.J.3
  • 57
    • 0032173149 scopus 로고    scopus 로고
    • Laminar cirrus observed near the tropical tropopause by LITE
    • Winker, D. M., and C. R. Trepte, Laminar cirrus observed near the tropical tropopause by LITE, Geophys. Res. Lett., 25, 3351-3354, 1998.
    • (1998) Geophys. Res. Lett. , vol.25 , pp. 3351-3354
    • Winker, D.M.1    Trepte, C.R.2
  • 58
    • 0030430633 scopus 로고    scopus 로고
    • Zonal asymmetries in Southern Hemisphere column ozone: Implications of biomass burning
    • Ziemke, J. R., S. Chandra, A. M. Thompson, and D. P. McNamara, Zonal asymmetries in Southern Hemisphere column ozone: Implications of biomass burning, J. Geophys. Res., 101, 14,421-14,427, 1996.
    • (1996) J. Geophys. Res. , vol.101
    • Ziemke, J.R.1    Chandra, S.2    Thompson, A.M.3    McNamara, D.P.4


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