Abstract
Relationship of outgoing long-wave radiation (OLR) with convective available potential energy (CAPE) and temperature at the 100-hPa pressure level is examined using daily radiosonde data for a period 1980–2006 over Delhi (28.3°N, 77.1°E) and Kolkata (22.3°N, 88.2°E), and during 1989–2005 over Cochin (10°N, 77°E) and Trivandrum (8.5°N, 77.0°E), India. Correlation coefficient (R xy) between monthly OLR and CAPE shows a significant (~ − 0.45) anti-correlation at Delhi and Kolkata suggesting low OLR associated with high convective activity during summer (seasonal variation). Though, no significant correlation was found between OLR and CAPE at Cochin and Trivandrum (low latitude region); analysis of OLR and temperature (at 100-hPa) association suggests that low OLR peaks appear corresponding to low temperature at Delhi (R xy~ 0.30) and Kolkata (R xy ~ 0.25) during summer. However, R xy between OLR and temperature becomes opposite as we move towards low latitudes (~8°–10°N) due to strong solar cycle influence. Large scale components mainly ENSO and quasi-biennial oscillaton (QBO) that contributed to the 100-hPa temperature variability were also analyzed, which showed that ENSO variance is larger by a factor of two in comparison to QBO over Indian region. ENSO warm conditions cause warming at 100-hPa over Delhi and Darwin. However, due to strong QBO and solar signals in the equatorial region, ENSO signal seems less effective. QBO, ENSO, and solar cycle contribution in temperature are found location-dependent (latitudinal variability) responding in consonance with shifting in convective activity regime during El Niño, seasonal variability in the tropical easterly jet, and the solar irradiance.
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References
Baldwin M P, Gray L J, Dunkerton T J, Hamilton K, Haynes P H, Randel W J, Holton J R, Alexander M J, Hirota I, Horinouchi T, Jones D B A, Kinnersley J S, Marquardt C, Sato K and Takahasi M 2001 The Quasi-Biennial Oscillation; Rev. Geophys. 39 179–229.
Bell G D and Halpert M S 1998 Climate assessment for 1997; Bull. Amer. Meteorol. Soc. 79(5) S1–S50.
Chun H-Y, Goh J-S, Song I-S and Riccardulli L 2007 Latitudinal variations of the convective sources and propagation condition of Inertia-gravity waves in the tropics; J. Atmos. Sci. 64 1603–1616.
Dhaka S K, Sapra R, Panwar V, Goel A, Bhatnagar R, Kaur M, Mandal T K, Jain A R and Chun H-Y 2010 Influence of large-scale variations in convective available potential energy (CAPE) and solar cycle over temperature in the tropopause region at Delhi (28.3°N, 77.1°E), Kolkata (22.3°N, 88.2°E), Cochin (10°N, 77°E) and Trivandrum (8.5°N, 77.0°E) using radiosonde during 1980–2005; Earth Planets Space 62 319–331.
Dunkerton T J 1997 The role of gravity waves in the quasi-biennial oscillation; J. Geophys. Res. 102(D22) 26,053–26,076.
Dunkerton T J and Delisi D P 1985 Climatology of the equatorial lower stratosphere; J. Atmos. Sci. 42 376–396.
Gage K and Reid G 1987 Longitudinal variations in tropical tropopause properties in relation to tropical convection and ENSO events; J. Geophys. Res. 92 14,197– 14,203.
Gettelman A, Seidel D J, Wheeler M C and Ross R J 2002 Multidecadal trends in tropical convective available potential energy; J. Geophys. Res. 107(D21) 4606.
Gray L J, Phipps S J, Dunkerton T J, Baldwin M P, Drysdale E F and Allen M R 2001 A data study of the influence of the equatorial upper stratosphere on northern-hemisphere stratospheric sudden warmings; Quart. J. Roy. Meteorol. Soc. 127 1985–2003.
Holton J R, Curry J H and Payle J A 2003 Inter Tropical Convergence Zone; Encyclopedia of Atmospheric Science 6 2325–2334.
Jain A R, Panwar V, Mandal T K, Rao V R, Goel A, Gautam R, Das S S and Dhaka S K 2010 Mesoscale convection system and occurrence of extreme low tropopause observations over Asian summer monsoon region; Ann. Geophys. 28 927–940.
Jain A R, Panwar V, Johny C J, Mandal T K, Rao V R, Gautam R and Dhaka S K 2011 Occurrence of extremely low cold point tropopause temperature during Summer monsoon season: ARMEX campaign and CHAMP/COSMIC satellite observations; J. Geophys. Res. 116 D03102, doi: 10.1029/2010JD014340.
Mc Bridge J L and Frank W M 1999 Relationship between stability and monsoon convection; J. Atmos. Sci. 56 24–56.
Naujokat B 1986 An update of the observed quasi-biennial oscillation of the stratospheric winds over the tropics; J. Atmos. Sci. 43 1873–1877.
Pascoe C L, Gray L J, Crooks S A, Juckes M N and Baldwin M P 2005 The quasi-biennial oscillation: Analysis using ERA-40 data; J. Geophys. Res. 110 D08105, doi:10.1029/2004JD004941.
Randel W J, Wu F, Swinbank R, Nash J and O’Neill A 1999 Global QBO circulation derived from UKMO stratospheric analyses; J. Atmos. Sci. 56 457– 474.
Randel W J, Wu Fei and Gaffen D J 2000 Interannual variability of the tropical tropopause derived from radiosonde data and NCEP reanalyses; J. Geophys. Res. 105(D12) 15,509–15,523.
Randel W J, Wu F, Vömel H, Nedoluha G E and Forster P 2006 Decreases in stratospheric water vapor after 2001: Links to changes in the tropical tropopause and the Brewer-Dobson circulation; J. Geophys. Res. 111 D12312, doi:10.1029/2005JD006744.
Reid G and Gage K 1985 Interannual variations in the height of the tropical tropopause; J. Geophys. Res. 90 5629–5635.
Roy Bhowmik S K, Roy S S and Kundu P K 2008 Analysis of large-scale conditions associated with convection over the Indian region; Int. J. Clim. 28 797–821.
Solomon S, Karen H Rosenlof, Robert W Portmann, John S Daniel, Sean M Davis, Todd J Sanford and Gian-Kasper Plattner 2010 Contributions of stratospheric water vapor to decadal changes in the rate of global warming; Science 327 1219–1223.
Williams E R and Renno N O 1993 An analysis of the conditional instability of the tropical atmosphere; Mon. Weather Rev. 121 21–36.
Yulaeva E and Wallace J M 1994 The signature of ENSO in global temperature and precipitation fields derived from the microwave sounding unit; J. Climate 7 1719– 1736.
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SAPRA, R., DHAKA, S.K., PANWAR, V. et al. Long-term variations in outgoing long-wave radiation (OLR), convective available potential energy (CAPE) and temperature in the tropopause region over India. J Earth Syst Sci 120, 807–823 (2011). https://doi.org/10.1007/s12040-011-0113-2
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DOI: https://doi.org/10.1007/s12040-011-0113-2