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Studies of Two Important Stability Indices of Earth’s Atmosphere Determined by using the COSMIC GPS Radio Occultation Technique

Affiliations

  • Department of Physics, Yogi Vemana University, Kadapa - 516003, Andhra Pradesh, India
  • Shri Vishnu Engineering College for Women, Bhimavaram - 534202, Andhra Pradesh, India
  • Department of Electronics and Communication Engineering, LBR College of Engineering, Mylavaram - 521230, Andhra Pradesh, India

Abstract


Objectives: To study the seasonal variations of two important atmosphere stability indices, i.e. Convective Available Potential Energy (CAPE) and Convective Inhibition (CIN) for the selected years, i.e. from 2007 to 2012 using the COSMIC (Constellation Observing System for Meteorology, Ionosphere, and Climate) Radio occultation (RO) technique. Methods/Analysis: We used the COSMIC RO technique as we consider that it provides more accurate, all-weather, round the-clock and global coverage of the lower atmosphere and ionosphere constituents with unprecedented resolutions. Further, we used the lower atmosphere database provided by the COSMIC RO technique in order to study the above two parameters (CAPE & CIN). Findings: It was found that, for the very first time, the consistency of wavy nature in CAPE seasonal trends which are confined to northern and southern hemispheres alternatively. The wavelike nature in CAPE trends seems to be following Inter- Tropical Convergence Zone (ITCZ) movement and, in such case, the CAPE trends may be useful to ascertain the ITCZ movements during different seasons of a year and the CAPE magnitude shows higher values over land than oceanic regions, which confirms the consistency of their calculations. In this regard, the trends of both CAPE and CIN have shown a close bimodal distribution. Applications/Improvement: As a result, we find better correlations of both CAPE and CIN computed through the atmospheric data measured with the COSMIC RO and collocated Radiosonde technique when the profile data are reaching to the near-surface of the Earth.

Keywords

Convective Available Potential Energy (CAPE), Convective Inhibition (CIN), GPS RO Technique, ITCZ.

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References


  • Blanchard DO. Assessing the Vertical Distribution of Convective Available Potential Energy. Weather Forecast. 1988; 13:870–77.
  • Showalter AK. A stability index for thunderstorm forecasting. Bulletin of American Meteorological Society. 1953; 34(3):250–52.
  • Galway JG. The lifted index as a predictor of latent instability. Bulletin of American Meterological Society. 1956; 37:528–29.
  • Moncrieff MW, Miller MJ. The dynamics and simulation of tropical cumulonimbus and squall lines. Quarterly Journal of Royal Meteorological Society. 1976; 102(432):373–94.
  • Romero R, Gaya M, Doswell tCA. European climatology of severe convective storm environmental parameters: a test for significant tornado events. Atmospheric Research. 2007; 83(2-4):389–404.
  • Brooks HE, Lee JW, Craven JP. The spatial distribution of severe thunderstorm and tornado environments from global reanalysis data. Atmospheric Research. 2003; 67–68:73–94.
  • Brooks HE, Anderson AR, Riemann K, Ebbers I, Flachs H. Climatological aspects of convective parameters from the NCAR/NCEP reanalysis. Atmospheric Research. 2007; 83(2-4):294–305.
  • Romero R, Gaya M, Doswell CA. European climatology of severe convective storm environmental parameters, a test for significant tornado events. Atmospheric Research. 2007; 83(2-4):389–404.
  • Riemann K, Fraedrich K, Lunkeit F. Global climatology of Convective Available Potential Energy (CAPE) and Convective Inhibition (CIN) in ERA-40 reanalysis. Atmospheric Research. 2009; 93(1-3):534–45.
  • Gettelman A. Multidecadal trends in tropical convective available potential energy. Journal of Geophysical Research. 2002; 107(21):1–8.
  • Williams E, Renno N. An analysis of the conditional instability of the tropical atmosphere. Monthly Weather Review. 1993; 121:21–36.
  • DeMott CA, Randall DA. Observed variations of tropical convective available potential energy. Journal of Geophysical Research. 2004; 109(2):1–11.
  • Dhaka SK, Panwar V, Sapra R, Bhatnagar R. Large scale variation in observed convective available potential energy (CAPE) over Chennai, Kolkata, and Delhi using radiosonde. In Proceedings of the Eleventh International Workshop on Technical and Scientific Aspects of MST Radar. 2007; 720–23.
  • Dhaka SK, Sapra R, Panwar V, Goel A, Bhatnagar R, Kaur M, Mandal TK, Jain AR, Chun HY. 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. 2010; 62:319–31.
  • Ratnam M V, Durga Santhi Y, Rajeevan M, Rao SVB. Diurnal variability of stability indices observed using radiosonde observations over a tropical station: Comparison with microwave radiometer measurements.Atmospheric Research. 2013; 124:21–33.
  • Chan PW. Performance and application of a multi wavelength, ground-based microwave radiometer in intense convective weather. Meteorology Zeitschrift. 2009; 18(3):253–65.
  • Cimini D, Campos E, Ware R, Albers S, Giuliani G, Oreamuno, Paul JJ, Steve E K, Stewart C, Westwater Ed. Thermodynamic Atmospheric Profiling During the Winter Olympics using Ground-Based Microwave Radiometry. IEEE transactions on Geoscience and Remote Sensing. 2011; 49(12):4959–69.
  • Cimini D, Pierdicca N, Pichelli E, Ferretti R, Mattioli V, Bonafoni S, Montopoli M, Perissin D. On the accuracy of integrated water vapor observations and the potential for mitigating electromagnetic path delay error in In SAR. Atmos Meas Tech Discuss. 2012; 5:1015–30.
  • Gutzler DS. Climatic variability of temperature and humidity over the tropical western Pacific. Geophysical Research Letters. 1992; 19(15):1595–8.
  • Gutzler DS. Low-frequency ocean-atmosphere variability across the tropical western Pacific. Journal of Atmosheric Sciences. 1996; 53(19):2773–85.
  • Gaffen DJ, Santer BD, Boyle JS, Christy JR, Graham N, Ross R. Multidecadal changes in the vertical temperature structure of the tropical atmosphere. Science. 2000; 287(5456):1242–45.
  • De Mott CA, Randall DA. Observed variations of tropical convective available potential energy. J Geophysical Research. 2004; 109(2):1–14.
  • Anthes RA, Bernhardt PA, Chen Y, Cucurull L, Dymond KF, Ector D, Healy SB, Ho SP, Hunt DC, Kuo YH, Liu H, Manning K, Mccormick C, Meehan TK, Randel WJ, Rocken C, Schreiner WS, Sokolovskiy SV, Syndergaard S, Thompson DC, Trenberth KE, Wee TK, Yen NL, Zeng Z. The COSMIC/FORMOSAT-3 Mission: Early Results. Bulletin of American Meteorological Society. 2008; 89:313–33.
  • Brahmanandam PS, Chu YH, Liu J. Observations of equatorial Kelvin wave modes in FORMOSAT-3/COSMIC GPS RO temperature profiles. Terrestial, Atmospheric and Ocean Science. 2010 ;(5):817–27.
  • Anthes RA. Exploring Earth’s atmosphere with radio occultation: contributions to weather, climate and space weather. Atmospheric Measurement Techniques. 2011; 4:1077–103.
  • Prasad Rao Anisetty SKAV, Brahmanandam PS, Uma G, Babu NA, Huang CY, Kumar AG, Ram TS, Wang HL, Chu YH. Planetray-scale wave structures in Earth’s atmosphere using COSMIC observations. Journal of Meteorological Research. 2014; 28(22):281–95.
  • Kishore P, Namboothiri SP, Jiang JH. Global temperature estimates in the troposphere and stratosphere: A validation study of COSMIC/FORMOSAT-3 measurements. Atmospheric Chemistry and Physics. 2009; 9(3):897–908.
  • Sabzevari AA, Miri GR. Studying Temperature Component Variations in Relation with the Increase of the Atmosphere Carbon Dioxide in Fars Province, Iran. Indian Journal of Science and Technology. 2012 Sep; 5(9):3281–87.
  • Healy S, Eyre J. Retrieving temperature, water vapor and surface pressure information from refractive-index profiles derived by radio occultation: A simulation study. Journal of Royal Meteorlogical Society. 2000; 126(566):1661–83.
  • Healy SB, Eyre JR. Retrieving temperature, water vapor and surface pressure information from refractive-index profiles derived by radio occultation, A simulation study. Journal of Royal Meteorlogical Society. 2000; 126(566):1661–83.
  • Gurbanov G, Kornblueh L. Principles of variational assimilation of GNSS radio occultation data. Max Planck Institute for Meteorology: Germany, 2003.
  • Ross RJ, Elliott WP. Tropopsheric water vapour climatology and trends over North America. Journal of Climate. 1994; 9(3):3561–74.
  • Ao CO, Hajj GA, Meehan TK, Dong D, Iijima BA, Mannucci AJ, Kursinski ER. Rising and setting GPS occultations by use of open-loop tracking. Journal of Geophysical Research. 2009; 114 pp.
  • Mariappan S, Sasibhusana Rao G, Ravindra Babu S. Enhancing GPS Receiver Tracking Loop Performance in Multipath Environment using an Adaptive Filter Algorithm. Indian Journal of Science and Technology. 2014 Nov; 7(S7):156–64.
  • Babu NA, Nee JB, Kumar KK. Seasonal and diurnal variation of convective available potential energy (CAPE) using COSMIC/FORMOSAT-3 observations over the tropics. Journal of Geophysical Research. 2010; 115(4):1–8 36. Das PK. The Monsoons, National Book Trust: New Delhi. 1991; 254 pp.
  • Asnani GC. Tropical Meteorology. Indian Institute of Tropical Meteorology. 1993; 1(1):1202.
  • Emanuel KA, Neelin J, Bretherton C. On large scale circulations in convecting atmospheres Q. Journal of Royal Meteorological Society. 1994; 120(519):1111–43.
  • Dhaka SK, Takahashi M, Kawatani Y, Shibagaki Y, Fukao S. Observations of deep convective updrafts in tropical convection and their role in the generation of gravity waves. Journal of Meteorological Society of Japan. 2003; 81(5):1185–99.
  • Dhaka SK, Yamamoto MK, Shibagaki Y, Hashiguchi H, Yamamoto M, Fukao S. Convection-induced gravity waves observed by the Equatorial Atmosphere Radar (0.2◦S, 100.32◦E) in Indonesia. Geophysical Research Letters. 2005; 32(9):14–820.
  • Dhaka SK, Yamamoto MK, Shibagaki Y, Hashiguchi H, Fukao S, Chun HY. Equatorial Atmosphere Radar observations of short vertical wavelength gravity waves in the upper troposphere and lower stratosphere region induced by localized convection. Geophysical Research Letters. 2006; 33(19):1–7.
  • Donovan MF. The Identification and Verification of Hazardous Convective Cells over Oceans using Visible and Infrared Satellite Observations. Journal of Applied Meteorology Climatology. 2007; 47:164–84.
  • Glickman TS. Glossary of Meteorology. Second Edition. American Meteorological Society: Boston, MA. 2000; 855 pp.
  • Hernandez MK, Kuo Y-H, Douglas CH, Rachel H. Utilizing radio occultation soundings to estimate convective potentials over ocean.12th Conference on IOAS-AOLS. 2007; 1–16.
  • Doswell CA, Rasmussen E. The effect of neglecting the virtual temperature correction on CAPE calculations. Weather and Forecasting. 1994; 9:625–29.
  • Blanchard DO. Assessing the Vertical Distribution of Convective Available Potential Energy. Weather Forecasting. 1988; 13:870–77.

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