JAMSTEC > JAMSTEC研究者総覧 > Jayanthi Venkata Ratnam

JAMSTEC研究者総覧

  • Jayanthi Venkata Ratnam
  • ベンカタ ラトナム ジャヤンティ
所属
付加価値情報創生部門 アプリケーションラボ 気候変動予測情報創生グループ
キャリア
主任研究員

プロフィール

専門

研究業績

査読有り(JAMSTECでの成果)

  • J.V. Ratnam, Takeshi Doi, Swadhin Behera. Improving austral summer precipitation forecasts of SINTEX‐F2 coupled ocean-atmosphere general circulation model over southern Africa by simple bias correction techniques. Atmospheric Science Letters, 2019, 20, 3, doi: 10.1002/asl.885
  • J.V. Ratnam, Takeshi Doi, Willem A. Landman, Swadhin K. Behera. Seasonal forecasting of onset of summer rains over South Africa. Journal of Applied Meteorology and Climatology, 2018, 57, 12, p. 2697-2711, doi: 10.1175/JAMC-D-18-0067.1
  • Behera, S. K., Y. Morioka, T. Ikeda, T. Doi, J. Ratnam, M. Nonaka, A. Tsuzuki, C. Imai, Y. Kim, M. Hashizume, S. Iwami, P. Kruger, R. Maharaj, N. Sweijd and N. Minakawa. Malaria incidences in South Africa linked to a climate mode in southwestern Indian Ocean. Environmental Development, 2018, 27, p. 47-57, doi: 10.1016/j.envdev.2018.07.002
  • Swadhin K. Behera, J. V. Ratnam. Quasi-asymmetric response of the Indian summer monsoon rainfall to opposite phases of the IOD. Scientific Reports, 2018, 8, doi: 10.1038/s41598-017-18396-6
  • J. V. Ratnam, Swadhin K. Behera, R. Krishnan, Takeshi Doi, Satyaban B. Ratna. Sensitivity of Indian summer monsoon simulation to physical parameterization schemes in the WRF model. CLIMATE RESEARCH, 2017, 74, 1, p. 43-66, doi: https://doi.org/10.3354/cr01484
  • Satyaban B. Ratna, J.V. Ratnam, Swadhin K. Behera, Annalisa Cherchib, Wanqiu Wangc, Toshio Yamagata. The unusual wet summer (July) of 2014 in Southern Europe. Atmospheric Research, 2017, 189, p. 61-68, doi: http://dx.doi.org/10.1016/j.atmosres.2017.01.017
  • J.V.Ratnam, Takeshi Doi and Swadhin K. Behera. Dynamical downscaling of SINTEX-F2v CGCM seasonal retrospective austral summer forecasts over Australia. Journal of Climate, 2017, doi: http://dx.doi.org/10.1175/JCLI-D-16-0585.1
  • Satyaban B. Ratna, J. V. Ratnam, S. K. Behera, Fredolin T. Tangang, T. Yamagata. Validation of the WRF regional climate model over the subregions of Southeast Asia: climatology and interannual variability. Climate Research, 2016, doi: doi: 10.3354/cr01445
  • J. V. Ratnam, Swadhin K. Behera, H. Annamalai, Satyaban B. Ratna, M. Rajeevan & Toshio Yamagata. ENSO's far reaching connection to Indian cold waves. Scientific Reports, 2016, 6, 37657, doi: 10.1038/srep37657
  • J.V.Ratnam, Swadhin K. Behera, Satyaban B Ratna, M. Rajeevan and Toshio Yamagata. Anatomy of Indian heatwaves. Scientific Reports, 2016, 6, 24395, doi: 10.1038/srep24395
  • J.V.Ratnam, Swadhin K. Behera, Takeshi Doi, Satyaban B. Ratna and Willem A. Landman. Improvements to the WRF seasonal hindcasts over South Africa by bias correcting the driving SINTEX-F2v CGCM fields. Journal of Climate, 2016, doi: http://dx.doi.org/10.1175/JCLI-D-15-0435.1
  • J. V. Ratnam, Yushi Morioka, Swadhin K. Behera, Toshio Yamagata. A model study of regional air-sea interaction in the austral summer precipitation over southern Africa. Journal of Geophysical Research Atmospheres, 2015, doi: 10.1002/2014JD022154
  • Jaynathi Venkata Ratnam, Swadhin K. Behera, Toshio Yamagata. Role of Cross-Equatorial Waves in Maintaining Long Periods of Low Convective Activity over Southern Africa. Journal of the Atmospheric Sciences, 2015, 72, 2, p. 682-692, doi: 10.1175/JAS-D-14-0063.1
  • JAYANTHI RATNAM VENKATA , BEHERA SWADHIN K. , MASUMOTO YUKIO , YAMAGATA TOSHIO. Remote effects of El Nino and Modoki events on the Austral Summer Precipitation of Southern Africa. Journal of Climate, 2014, doi: 10.1175/JCLI-D-13-00431.1
  • Sahu Netrananda , BEHERA SWADHIN K, JAYANTHI RATNAM VENKATA, Valmir Da Silva Roberto , Parhi Pradipta , Duan Welli , Takara Kaoru , Singh R.B. , YAMAGATA TOSHIO. El Nino Modoki connection to extremely-low streamflow of the Paranaiba River in Brazil. Climate Dynamics, 2013, doi: 10.1007/s00382-013-2006-3
  • Satyaban B. Ratna, J. V. Ratnam, S. K. Behera, C. J. deW. Rautenbach, T. Ndarana, K. Takahashi, T. Yamagata. Performance assessment of three convective parameterization schemes in WRF for downscaling summer rainfall over South Africa. Climate Dynamics, 2013, 42, p. 2931-2953, doi: DOI 10.1007/s00382-013-1918-2
  • Ratna Satyaban Bishoyi , JAYANTHI RATNAM VENKATA , BEHERA SWADHIN K. , Rautenbach C.J.deW , Ndarana T. , Takahashi Keiko , YAMAGATA TOSHIO. Performance assessment of three convective parameterization schemes in WRF for downscaling summer rainfall over South Africa. Climate Dynamics, 2013, doi: 10.1007/s00382-013-1918-2
  • Yushi Morioka, Ratnam Venkata Jayanthi, Wataru Sasaki, Yukio Masumoto. Generation mechanism of the South Pacific subtropical dipole. Journal of Climate, 2013, 26, 16, p. 6033-6045, doi: 10.1175/JCLI-D-12-00648.1
  • Ratnam, J., S. Behera, S. Ratna, H. Rautenbach, C. Lennard, J. Luo, Y. Masumoto, K. Takahashi, and T. Yamagata. Dynamical downscaling of austral summer climate forecasts over southern Africa using a regional coupled model. Journal of Climate, 2013
  • Satyaban B. Ratna; Swadhin Behera; J. Venkata Ratnam; Keiko Takahashi; Toshio Yamagata. An index for tropical temperate troughs over southern Africa. Climate Dynamics, 2012, 41, 2, p. 421-441, doi: 10.1007/s00382-012-1540-8
  • Swadhin Behera, Jayanthi V. Ratnam, Yukio Masumoto, Toshio Yamagata. Origin of Extreme Summers in Europe: The Indo-Pacific Connection.. Climate Dynamics, 2012, p. 1-14, doi: 10.1007/s00382-012-1524-8
  • Ratnam, J. V., S. K. Behera, Y. Masumoto, T. Yamagata. Role of Rossby waves in the remote effects of the north Indian Ocean tropical disturbance. Monthly Weather Review, 2012, 140, 11, p. 3620-3633, doi: 10.1175/MWR-D-12-0027.1
  • J. V. Ratnam, S. K. Behera, Y. Masumoto, K. Takahashi, T. Yamagata. A simple regional coupled model experiment for summer-time climate simulation over southern Africa. Climate Dynamics, 2011, doi: DOI: 10.1007/s00382-011-1190-2
  • J. V. Ratnam, S. K. Behera, Y. Masumoto, K. Takahashi, T. Yamagata. Anomalous climatic conditions associated with the El Nino Modoki during boreal winter of 2009. Climate Dynamics, 2011, p. -011-1108-z, doi: 10.1007/s00382
  • Pacific Ocean origin for the 2009 Indian summer monsoon failure. Geophysical Research Letters, 2010, 37, L07807, doi: 10.1029/2010GL042798