A numerical study on the role of atmospheric forcing on mixed layer depth variability in the Bay of Bengal using a regional ocean model     

Dandapat  Sumit  Chakraborty  Arun  Kuttippurath  Jayanarayanan  Bhagawati  Chirantan  Sen  Radharani 《Ocean Dynamics》2021,71(10):963-979

Ocean Dynamics - This study investigates the role of driving atmospheric forces [winds, net heat flux, and evaporation–precipitation (E–P)] and the possible mechanisms on the mixed...  相似文献   

The sudden stratospheric warming and chemical ozone loss in the Antarctic winter 2019: comparison with the winters of 1988 and 2002     

Roy  R.  Kuttippurath  J.  Lefèvre  F.  Raj  S.  Kumar  P. 《Theoretical and Applied Climatology》2022,149(1-2):119-130

Theoretical and Applied Climatology - Sudden stratospheric warmings (SSWs) are associated with rapid rise in temperature in a short period of time in the polar vortex and reversal of the zonal...  相似文献   

Interannual variability and characteristics of the East India Coastal Current associated with Indian Ocean Dipole events using a high resolution regional ocean model     

Sumit Dandapat  Arun Chakraborty  Jayanarayanan Kuttippurath 《Ocean Dynamics》2018,68(10):1321-1334

The characteristics and variability of the East India Coastal Current (EICC), the western boundary current in the Bay of Bengal (BoB) during the Indian Ocean Dipole (IOD) years between 2006 and 2012 have been investigated using the high-resolution Regional Ocean Modeling System (ROMS). The evolution of temperature, mixed layer depth (MLD), and seasonal basin scale circulation in the upper ocean simulated by the model agrees well with the observations. The EICC in BoB is characterized by a seasonal reversal flow: the poleward EICC during February?May and the equatorward EICC during August?December. A long-term simulation from 2006 to 2012 suggest that the circulation pattern, boundary current structure, and transport in the western BoB are completely different in positive and negative IOD years. As IOD is mainly phase-locked to the seasonal cycle with most significant influence in the Borel autumn, the equatorward EICC is affected during the IOD years. It is found that the strength of this EICC is ~?5 Sv in October 2010 and a weaker EICC dominated by the presence of eddies is observed in October 2006. We also quantified the local and remote forcing effects on the variability of EICC and found that the seasonal coastal Kelvin waves (KWs) play a dominant role in the development of the EICC. During positive IOD year 2006, due the absence of second downwelling KW, the EICC is completely disorganized and dominated by the eddies, whereas in the negative IOD year 2010, the strong second downwelling KW plays a key role in developing organized and stable EICC in the western BoB.  相似文献   

Genesis and simultaneous occurrences of the super cyclone Kyarr and extremely severe cyclone Maha in the Arabian Sea in October 2019     

Akhila  R. S.  Kuttippurath  J.  Rahul  R.  Chakraborty  A. 《Natural Hazards》2022,110(2):1133-1152

Natural Hazards - Waterlogging and sunlight shortage are important factors that significantly deteriorate the yield and quality of wheat. The objective of this study was to evaluate the effects of...  相似文献   

A coupled model analyses on the interaction between oceanic eddies and tropical cyclones over the Bay of Bengal     

Anandh  Thanka Swamy  Das  Bijan Kumar  Kuttippurath  J.  Chakraborty  Arun 《Ocean Dynamics》2020,70(3):327-337

Ocean Dynamics - The Bay of Bengal (BOB) region of Indian Ocean is affected by numerous tropical cyclones during pre- and post-monsoon seasons when various eddies are generated in the central and...  相似文献   

Aircraft measurements and model simulations of stratospheric ozone and N2O: implications for chemistry and transport processes in the models     

Jayanarayanan Kuttippurath  Armin Kleinböhl  Holger Bremer  Harry Küllmann  Justus Notholt  Björn-Martin Sinnhuber  Wuhu Feng  Martyn Chipperfield 《Journal of Atmospheric Chemistry》2010,66(1-2):41-64

Airborne measurements of stratospheric ozone and N₂O from the SCIAMACHY (Scanning Imaging Absorption Spectrometer) Validation and Utilization Experiment (SCIA-VALUE) are presented. The campaign was conducted in September 2002 and February–March 2003. The Airborne Submillimeter Radiometer (ASUR) observed stratospheric constituents like O₃ and N₂O, among others, spanning a latitude from 5°S to 80°N during the survey. The tropical ozone source regions show high ozone volume mixing ratios (VMRs) of around 11 ppmv at 33 km altitude, and the altitude of the maximum VMR increases from the tropics to the Arctic. The N₂O VMRs show the largest value of 325 ppbv in the lower stratosphere, indicating their tropospheric origin, and they decrease with increasing altitude and latitude due to photolysis. The sub-tropical and polar mixing barriers are well represented in the N₂O measurements. The most striking seasonal difference found in the measurements is the large polar descent in February–March. The observed features are interpreted with the help of SLIMCAT and Bremen Chemical Transport Model (CTMB) simulations. The SLIMCAT simulations are in good agreement with the measured O₃ and N₂O values, where the differences are within 1 ppmv for O₃ and 15 ppbv for N₂O. However, the CTMB simulations underestimate the tropical middle stratospheric O₃ (1–1.5 ppmv) and the tropical lower stratospheric N₂O (15–30 ppbv) measurements. A detailed analysis with various measurements and model simulations suggests that the biases in the CTMB simulations are related to its parameterised chemistry schemes.  相似文献   

Significant changes in the ENSO-monsoon relationship and associated circulation features on multidecadal timescale     

Seetha  C. J.  Varikoden  Hamza  Babu  C. A.  Kuttippurath  J. 《Climate Dynamics》2020,54(3):1491-1506

Climate Dynamics - We observe significant changes in the ENSO–Indian summer monsoon rainfall (ISMR) relationship in past three multidecadal epochs (early epoch: 1931–1960, middle epoch:...  相似文献