Abstract
Using the method of Thorpe analysis, the TKE (turbulence kinematic energy) dissipation rate (ɛ) and turbulence diffusivity (K) were derived from the RS (radiosounding) measurements in the tropical oceanic upper troposphere. The measurements were performed four times per day during two intense observation periods (May 5–25, and June 5–25) on the Kexue #1 scientific observation ship of SCSMEX (South China Sea Monsoon EXperiment) in 1998. There are three new features obtained from our analysis. First, the responses of ɛ and K to the onset of monsoon are negligible over the ocean at least for the data used here. Second, the temporal variations of ɛ and K are in a similar manner and exhibit strong diurnal variations. The diurnal variations achieve their maxima in the morning (08 LT) and early afternoon (14 LT), and achieve their minima in the evening (20 LT) and early morning hours (02 LT). The diurnal variations of turbulence parameters (ɛ and K) and their responses to the onset of monsoon are entirely different from those derived over land at similar latitudes. Finally, although the correlations between the variations of ɛ and MCSs (mesoscale convective systems), which were derived from TRMM (tropical rainfall measuring mission) satellite, are not very well in only few days, the diurnal variations of ɛ averaged over May and June are strongly correlated with the diurnal variations of MCSs with correlation factors of 0.79 and 0.94, respectively. This indicates that the turbulence and its diurnal variations over the tropic oceanic upper stratosphere region are highly related to the MCSs.
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Holton J R, Peter H H, McIntyre M E, et al. Stratosphere-troposphere exchange. Rev Geophys, 1995, 33: 403–439
Fritts D C, Alexander M J. Gravity wave dynamics and effects in the middle atmosphere. Rev Geophys, 2003, 41: 1003, doi:10.1029/2001RG000106
Zhang S D, Yi F, Huang C M, et al. High vertical resolution analyses of gravity waves and turbulence at a midlatitude station. J Geophys Res, 2012, 117: D02103, doi:10.1029/2011JD016587
Yao M, Cheng Y. Cloud simulations in response to turbulence parameterizations in the GISS Model E GCM. J Climat, 2012, 25: 144963–144974
Rao N D, Rao T N, Ratnam M V, et al. Diurnal and seasonal variability of turbulence parameters observed with Indian MST Radar. Radio Sci, 2001a, 36: 1439–1457
Rao N D, Ratnam M V, Rao T N, et al. Seasonal variation of vertical eddy diffusivity in the troposphere, lower stratosphere and mesosphere over a tropical station. Ann Geophys, 2001b, 19: 975–984
Nath D, Ratnam M V, Patra A K, et al. Turbulence characteristics over tropical station Gadanki (13.5°N, 79.2°E) estimated using high-resolution GPS radiosonde data. J Geophys Res, 2010, 115: D07102, doi:10.1029/2009 JD012347
Kalapureddy M C R, Kumar K K, Sivakumar V, et al. Diurnal and seasonal variability of TKE dissipation rate in the ABL over a tropical station using UHF wind profiler. J Atmos Sol-Terr Phys, 2007, 69: 419–430
Fujiwara M, Yamamoto M K, Hashiguchi H, et al. Turbulence at the tropopause due to breaking Kelvin waves observed by the Equatorial Atmosphere Radar. Geophys Res Lett, 2003, 30: 1171, doi:10.1029/2002GL016278
Alappattu D P, Kunhikrishnan K. First observations of turbulence parameters in the troposphere over the Bay of Bengal and the Arabian Sea using radiosonde. J Geophys Res, 2010, 115: D06105, doi: 10.1029/2009JD012916
Kiladis G N, Wheeler M C, Haertel P T, et al. Convectively coupled equatorial waves. Rev Geophys, 2009, 47: RG2003, doi:10.1029/2008RG000266
Ciesielski P E, Johnson R H. Contrasting characteristics of convection over the northern and southern South China Sea during SCSMEX. Mon Wea Rev, 2006, 133: 131–148
Ding Y, Li C, Liu Y. Overview of the South China Sea during SCSMEX field experiment in 1998. Adv Atmos Sci, 2004, 21: 255–276
Ding Y, Li C, He J, et al. South China Sea Monsoon Experiment (SCSMEX) and the east Asian monsoon. Acta Meteor Sin, 2006, 20: 159–190
Lau K M, Ding Y, Wang J, et al. A report of the field operations and early results of the South China Sea Monsoon Experiment (SCSMEX). Bull Amer Meteor Soc, 2000, 81: 1261–1270
Johnson R H, Ciesielski P E. Characteristics of the 1998 summer monsoon onset over the northern South China Sea during SCSMEX. J Meteor Sol Japan, 2002, 133: 131–148
Chen W J, Li C C. Oceanic rain rate retrievals using TRMM microwave imager multi-channel brightness temperatures during the 1998 SCSMEX. Terr Atmos Ocean Sci, 2000, 11: 765–788
Huffman G J, Adler R F, Rudolf B, et al. Global precipitation estimates based on a technique for combining satellite-based estimates, rain gauge analysis, and NWP model precipitation information. J Climate, 1995, 8: 1284–1295
Huffman G J. Estimates of root-mean-square random error for finite samples of estimated precipitation. J Appl Meteor, 1997, 36: 1191–1201
Huffman G J, Adler R F, Arkin P, et al. The global precipitation climatology project (GPCP) combined precipitation dataset. Bull Amer Meteor Soc, 1997, 78: 5–20
Thorpe S A. Turbulence and mixing in a Scottish Loch. Philos Trans Roy Soc London, 1977, 286A: 125–181
Thorpe S A. The Turbulent Ocean. Cambridge: Cambridge University Press, 2005. 439
Clayson C A, Kantha L. On turbulence and mixing in the free atmosphere inferred from high-resolution soundings. J Atmos Ocean Technol, 2008, 25: 833–852
Ferron B, Mercier H, Speer K, et al. Mixing in the Romanche Fracture Zone. J Phys Oceanogr, 1998, 28: 1929–1945
Wilson R, Luce H, Dalaudier F. Turbulence patch identification in potential density or temperature profiles. J Atmos Oceanic Technol, 2010, 27: 977–993
Wilson R, Dalaudier F, Luce H. Can one detect small-scale turbulence from standard meteorological radiosondes. Atmos Meas Tech, 2011, 4: 795–804
Gavrilov N M, Luce H, Crochet M, et al. Turbulence parameter estimations from high-resolution balloon temperature measurements of the MUTSI-2000 campaign. Ann Geophys, 2005, 23: 2401–2413
Kantha L, Hocking W. Dissipation rates of turbulence kinetic energy in the free atmosphere: MST radar and radiosondes. J Atmos Sol-Terr Phys, 2011, 73: 1043–1051
Gargett A, Garner T. Determining Thorpe scales from ship-lowered CTD density profiles. J Atmos Ocean Technol, 2008, 25: 1657–1670
Luce H, Fuka S, Dalandier F, et al. Strong mixing events observed near the tropopause with the MU radar and high-resolution balloon techniques. J Atmos Sci, 2002, 59: 2885–2896
Fukao S, Yamanaka M, Ao N, et al. Seasonal variability of vertical eddy diffusivity in the middle atmosphere: 1. Three-year observations by the middle and upper atmosphere radar. J Geophys Res, 1994, 99: 18973–18987
Bergman J W, Salby M L. Equatorial wave activity derived from fluctuations in observed convection. J Atmos Sci, 1994, 51: 3791–3806
Karoly D J, Roff G L, Reeder M J. Gravity wave activity associated with tropical convection detected in TOGA COARE sounding data. Geophys Res Lett, 1996, 23: 261–264
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Liu, X., Xu, J. & Yuan, W. Diurnal variations of turbulence parameters over the tropical oceanic upper troposphere during SCSMEX. Sci. China Technol. Sci. 57, 351–359 (2014). https://doi.org/10.1007/s11431-013-5445-5
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DOI: https://doi.org/10.1007/s11431-013-5445-5