Abstract
Diurnal variation of tropical convection and kinematic and thermodynamic conditions was investigated for different large-scale environments of the convectively active and inactive periods by using satellite observations and surface measurements during the Intensive Observation Period (IOP) of the Tropical Ocean Global Atmosphere/Coupled Ocean-Atmosphere Response Experiment (TOGA/COARE). During the convectively active period, the features of nocturnal convection appear in vertical profiles of convergence, vertical velocity, heat source, and moisture sink. The specific humidity increases remarkably in the middle troposphere at dawn. On the other hand, the altitude of maximum convergence and that of the upward motion is lower during the convectively inactive period. The specific humidity peaks in the lower troposphere in the daytime and decreases in the middle troposphere. Spectral analyses of the time series of the infrared (IR) brightness temperature (TBB) and amounts of rainfall suggest multiscale temporal variation with a prominent diurnal cycle over land and oceanic regions such as the Intensive Flux Array (IFA) and the South Pacific Convergence Zone (SPCZ). Over land, the daily maximum of deep convection associated with cloud top temperature less than 208 K appears at midnight due to the daytime radiative heating and the sea-land breeze. Over the ocean, convection usually tends to occur at dawn for the convectively active period while in the afternoon during the inactive period. Comparing the diurnal variation of convection with large-scale variables, the authors inferred that moisture in the middle troposphere contributes mostly to the development of nocturnal convection over the ocean during the convectively active period.
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Albright, M. D., E. E. Recker, R. J. Reed, and R. Dang, 1985: The diurnal variation of deep convection and inferred precipitation in the central tropical Pacific during January-February 1979.Mon. Wea. Rev.,113, 1663–1680.
Augustine, J. A., 1984: The diurnal variation of large-scale inferred rainfall over the tropical Pacific Ocean during August 1979.Mon. Wea. Rev.,112, 1745–1751.
Brown, R. G., and C. Zhang, 1997: Variability of midtropospheric moisture and its effect on cloud-top height distribution during TOGA COARE.J. Atmos. Sci.,54, 2760–2774.
Chang, A. T. C., L. S. Chiu, and G. Yang, 1995: Diurnal cycle of oceanic precipitation from SSM/I data.Mon. Wea. Rev.,123, 3371–3380.
Chen, S. S., and R. A. Houze Jr., 1997: Diurnal variation and life-cycle of deep convective systems over the tropical Pacific warm pool.Quart. J. Roy. Meteor. Soc.,123B 357–388.
Chen, S. S., R. A. Houze Jr., and B. E. Mapes, 1996: Multiscale variability of deep convection in relation to largescale circulation in TOGA COARE.J. Atmos. Sci.,53, 1380–1409.
Gray, W. M., and R. W. Jacobson, 1977: Diurnal variation of deep cumulus convection.Mon. Wea. Rev.,105, 1171–1188.
Gruber, A., 1976: An estimate of the daily variation of cloudiness over the GATE A/B area.Mon. Wea. Rev.,104, 1036–1039.
Hall, T. J., and T. H. Vonder Haar, 1999: The diurnal cycle of West Pacific deep convection and its relation to the spatial and temporal variation of tropical MCSs.J. Atmos. Sci.,56, 3401–3415.
Hendon, H. H., and K. Woodberry, 1993: The diurnal cycle of tropical convection.J. Geophys. Res.,98, 16623–16637.
Imaoka, K., and R. W. Spencer, 2000: Diurnal variation of precipitation over the tropical oceans observed by TRMM/TMI combined with SSM/I.J. Climate,13, 4149–4158.
Janowiak, J. E., P. A. Arkin, and M. Morrissey, 1994: An examination of the diurnal cycle in oceanic tropical rainfall using satellite and in situ data.Mon. Wea. Rev.,122, 2296–2311.
Johnson, R. H., 1984: Partitioning tropical heat and moisture budgets into cumulus and mesoscale components: Implications for cumulus parameterization.Mon. Wea. Rev.,112, 1590–1601.
Johnson, R. H., and D. L. Priegnitz, 1981: Winter monsoon convection in the vicinity of North Borneo. Part II: Effects on large-scale fields.Mon. Wea. Rev.,109, 1619–1632.
Kiladis, G. N., G. A. Meehl, and K. M. Weickmann, 1994: Large-scale circulation associated with westerly wind bursts and deep convection over the western equatorial Pacific.J. Geophys. Res.,99, 18527–18544.
Lin, X., and R. H. Johnson, 1996a: Kinematic and thermodynamic characteristics of the flow over the western Pacific warm pool during TOGA COARE.J. Atmos. Sci.,53, 695–715.
Lin, X., and R. H. Johnson, 1996b: Heating, moistening, and rainfall over the western Pacific warm pool during TOGA COARE.J. Atmos. Sci.,53, 3367–3383.
Liu, G. S., J. A. Curry, and R. S. Sheu, 1995: Classification of clouds over the western equatorial Pacific Ocean using combined infrared and microwave satellite data.J. Geophys. Res.,100, 13811–13826.
Lucas, C. E., and E. J. Zipser, 2000: Environmental variability during TOGA COARE.J. Atmos. Sci.,57, 2333–2350.
Mapes, B. E., and R. A. Houze Jr., 1993: Cloud clusters and superclusters over the oceanic warm pool.Mon. Wea. Rev.,121, 1398–1415.
Mapes, B. E., T. T. Waner, M. Xu, and A. J. Negri, 2003: Diurnal patterns of rainfall in northwestern South America. Part I: Observations and context.Mon. Wea. Rev.,131, 799–812.
McGarry, M. M., and R. J. Reed, 1978: Diurnal variations in convective activity and precipitation during phases III and II of GATE.Mon. Wea. Rev.,106, 101–112.
Miller, R. A., and W. M. Frank, 1993: Radiative forcing of simulated tropical cloud clusters.Mon. Wea. Rev.,121, 482–498.
Murakami, M., 1983: Analysis of the deep convective activity over the western Pacific and Southeast Asia. Part I: Diurnal variation.J. Meteor. Soc. Japan,61, 60–76.
Nakazawa, T., 1988: Tropical super clusters within intraseasonal variations over the western Pacific.J. Meteor. Soc. Japan,66, 823–839.
Nesbitt, S. W., and E. J. Zipser, 2003: The diurnal cycle of rainfall and convective intensity according to three years of TRMM measurements.J. Climate,16, 1456–1475.
Reeves, R. W., C. F. Ropelewski, and M. D. Hudlow, 1979: Relationship between large-scale motion and convective precipitation during GATE.Mon. Wea. Rev.,107, 1154–1168.
Ridout, J. A., 2002: Sensitivity of tropical Pacific convection to dry layers at midto upper levels: Simulation and parameterization tests.J. Atmos. Sci.,59, 3362–3381.
Short, D. A., and J. M. Wallace, 1980: Satellite inferred morning to evening cloudiness changes.Mon. Wea. Rev.,108, 1160–1169.
Short, D. A., P. A. Kucera, B. S. Ferrier, J. C. Gerlach, S. A. Rutledge, and O. W. Thiele, 1997: Shipboard radar rainfall patterns within the TOGA COARE IFA.Bull. Amer. Meteor. Soc.,78, 2817–2836.
Sui, C. -H., and K. -M. Lau, 1992: Multiscale phenomena in the tropical atmosphere over the western Pacific.Mon. Wea. Rev.,120, 407–430.
Sui, C. -H., K. -M. Lau, Y. Takayabu, and D. Short, 1997: Diurnal variations in tropical oceanic cumulus convection during TOGA COARE.J. Atmos. Sci.,54, 639–655.
Sui, C. -H., X. Li, and K.-M. Lau, 1998: Radiativeconvective processes in simulated diurnal variations of tropical oceanic convection.J. Atmos. Sci.,55, 2345–2357.
Takayabu, Y. N., and T. Nitta, 1993: 3–5 day-period disturbances coupled with convection over the tropical Pacific Ocean.J. Meteor. Soc. Japan,71, 221–246.
Tao, W. -K., S. Lang, J. Simpson, C. -H. Sui, B. Ferrier, and M.-D. Chou, 1996: Mechanisms of cloudradiation interaction in the Tropics and mid-latitudes.J. Atmos. Sci.,53, 2624–2651.
Torrence, C., and G. P. Compo, 1998: A practical guide to wavelet analysis.Bull. Amer. Meteor. Soc.,79, 61–78.
Weng, H., and K. -M. Lau, 1994: Wavelets, period doubling, and time-frequency localization with application to organization of convection over the tropical western Pacific.J. Atmos. Sci.,51, 2523–2541.
Yanai, M., S. Esbensen, and J. H. Chu, 1973: Determination of bulk properties of tropical cloud clusters from large-scale heat and moisture budgets.J. Atmos. Sci.,30, 611–627.
Yang, S., and E. A. Smith, 1999: Moisture budget analysis of TOGA-COARE area using SSM/I retrieved latent heating and large scale Q2 estimates.J. Atmos. Oceanic Technol.,16, 633–655.
Yang, S., and E. A. Smith, 2000: Vertical structure and transient behavior of convective-stratiform heating in TOGA-COARE from combined satellite-sounding analysis.J. Appl. Meteor.,39, 1491–1513.
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Byon, JY., Lim, GH. Diurnal variation of tropical convection during TOGA COARE IOP. Adv. Atmos. Sci. 22, 685–702 (2005). https://doi.org/10.1007/BF02918712
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DOI: https://doi.org/10.1007/BF02918712