Abstract
In this observational/diagnostic study, we illustrate the time history of some important parameters of the surface energy balance during the life cycle of a single monsoon season. This chronology of the surface energy balance portrays the differential equilibrium state from the preonset phase to the withdrawal phase. This includes an analysis of the time history of base variables such as soil moisture, ground temperature, cloud cover, precipitation and humidity. This is followed by an analysis of the components of the surface energy balance where we note subtle changes in the overall balances as we proceed from one epoch of the monsoon to the next. Of interest here is the transition sequence: preonset, onset, break, revival, break, revival and withdrawal during the year 2001. Computations are all illustrated for a box over central India where the coastal effects were small, data coverage was not sparse and where the semi-arid land mass changes drastically to a lush green area. This region exhibited large changes in the components of surface energy balance. The principal results pertain to what balances the difference among the incoming short wave radiation (at the earth’s surface) and the long wave radiation exhibited by the ground. That difference is balanced by a dominant sensible heat flux and the reflected short wave radiation in the preonset stage. A sudden change in the Bowen ratio going from>1 to <1 is noted soon after the onset of monsoon. Thereafter the latent heat flux from the land surface takes an important role and the sensible heat flux acquires a diminishing role. We also examine the subtle changes that occur in the components of surface energy balance between the break and the active phases. The break phases are seen to be quite different from the preonset phases. This study is aimed to illustrate the major importance of moisture and clouds in the radiative transfer computations that are central to the surface energy balance during each epoch. These sensitivities (of moisture and clouds) have major consequences for weather and climate forecasts
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References
Chen T C, Ren-Yow Tzeng and Ming-Cheng Yen 1988 Development and Life Cycle of the Indian Monsoon: Effect of the 30–50 Day Oscillation;Mon. Wea. Rev. 116 2183–2199.
Fels S B and Schwarzkopf M D 1975 The simplified exchange approximation: A new method for radiative transfer calculations;J. Atmos. Sci. 37 2265–2297.
Godbole R V 1977 The composite structure of the monsoon depression;Tellus 29 25–40.
Harshvardhan, Randall D A, Corsetti T G and Dazlich D A 1989 Earth radiation budget and cloudiness simulation with a general circulation model;J. Atmos. Sci. 46 1922–1942.
Kalnay Eet al 1996 “The NCEP/NCAR 40-year reanalysis project”;Bull. Amer. Meteor. Soc. 77 437–471.
Kistler R and Coauthors 2001 The NCEP/NCAR 50-year reanalysis: Monthly means CD-ROM and documentation.Bull. Amer. Meteor. Soc. 82 247–268.
Krishnamurti T N 1979 Compendium of Meteorology;WMO-No. 364, Geneva, Switzerland, WMO, 404–407 and 184–185.
Krishnamurti T N, Pan H, Chang C B, Polshay J and Odally W 1979 Numerical Weather Prediction for GATE;Quart. J. Roy. Meteor. Soc. 105 979–1010.
Kummerow C D, Barnes W, Kozu T, Shiue J and Simpson J 1998 The Tropical Rainfall Measuring Mission (TRMM) Sensor Package;J. Atmos. Ocean. Tech. 15(3) 809–817.
Lacis A A and Hansen J E 1974 A parameterization for the absorption of solar radiation in the Earth’s atmosphere;J. Atmos. Sci. 31 118–133.
Miyakoda K and Sirutis J 1986 Manual of the E-physics. [Available from Geophysical Fluid Dynamics Laboratory, Princeton University, P.O. Box 308, Princeton, NJ 08542.]
Pan H-L and Mahrt L 1987 Interaction between soil hydrology and boundary layer developments;Boundary Layer Meteor. 38 185–202.
Roberts R E, Selby J A and Biberman L M 1976 Infrared continuum absorption by atmospheric water vapor in the 8–12 micron window;Appl. Optics. 15 2085–2090.
Rodgers C D 1968 Some extension and applications of the new random model for molecular band transmission;Quart. J. Roy. Meteor. Soc. 94 99–102.
Sasamori T, London J and Hoyt D V 1972 Radiation budget of the Southern Hemisphere, in Meteorology of the Southern Hemisphere, Meteorological Monographs;American Meteorological Society 35 9–22.
Schwarzkopf M D and Fels S B 1985 Improvements to the algorithm for computing CO2 transmissivities and cooling rates;J. Geophys. Res. 90 10,541–10,550.
Schwarzkopf M D and Fels S B 1991 The simplified exchange method revisited: An accurate, rapid method for computation of infrared cooling rates and fluxes;J. Geophys. Res. 96 9075–9096.
Simon B and Joshi P C 1994 Determination of moisture changes prior to the onset of south-west monsoon over Kerala using NOAA TOVS satellite data;Meteor. Atmos. Phys. 53 223–231.
Thapliyal V, Majumdar A B and Krishnan V 2002 Weather in India-Monsoon Season (June to September 2001);Mausam 53 381–416.
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Krishnamurti, T.N., Biswas, M.K. Transitions in the surface energy balance during the life cycle of a monsoon season. J Earth Syst Sci 115, 185–201 (2006). https://doi.org/10.1007/BF02702033
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DOI: https://doi.org/10.1007/BF02702033