Study of an Extremely Severe Cyclonic Storm “Fani” over Bay of Bengal using regional NCUM modeling system: A case study

Routray, Aurobinda; Lodh, Abhishek; Dutta, Devajyoti; George, John P.

doi:10.1016/j.jhydrol.2020.125357

Cited by 17 publications

(10 citation statements)

References 62 publications

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“…Furthermore, Routray et al. (2020) indicated that a large‐scale moisture import from the equatorial Indian Ocean facilitated the intensification of an extremely severe TC, Fani (2019), over the Bay of Bengal during the pre‐monsoon season. These studies of TCs over the WNP and the Bay of Bengal share a common conclusion: the moisture transport from distant tropical oceans plays a significant role in strengthening TC intensity over the relatively cool midlatitude ocean.…”

Section: Introductionmentioning

confidence: 99%

Active Role of Sea Surface Temperature Changes Over the Kuroshio in the Development of Distant Tropical Cyclones in Boreal Fall

Fujiwara

Kawamura

2021

JGR Atmospheres

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This study examined the active role of sea surface temperature (SST) changes over the Kuroshio in the development of distant tropical cyclones (TCs) approaching Japan in October, using a cloud‐resolving model. We designed a real SST experiment and SST sensitivity runs by adding and subtracting SST anomalies equivalent to a spread of year‐to‐year October‐mean Kuroshio's SST changes. Under a synoptic environment that low‐level northeasterlies prevailed over the Kuroshio, systematic differences in TC intensity between the real and modified SST runs were simulated despite the developing TCs being far away from the modified SST areas. In the warm (cool) SST runs, active (inactive) moisture import from the Kuroshio increased (decreased) the equivalent potential temperature within the planetary boundary layer (PBL) in the inner core, thereby enhancing (weakening) the latent eyewall heating and the associated secondary circulation. The differences in the secondary circulation led to those in the inward advection of absolute angular momentum in the PBL, affecting a vortex spin‐up in the inner core. We also found that the surface heat and moisture supply from the Kuroshio facilitated the warming and moistening processes of midlatitude air parcels traveling over the underlying current, causing further reinforcement of the moisture import into the distant TC. These thermodynamic processes were more and less apparent in the warm and cool SST runs, respectively. Since the synoptic environment in this study often arises in boreal fall, the Kuroshio's SST warming in recent decades may influence the intensities of TCs approaching Japan in fall.

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Section: Introductionmentioning

confidence: 99%

Active Role of Sea Surface Temperature Changes Over the Kuroshio in the Development of Distant Tropical Cyclones in Boreal Fall

Fujiwara

Kawamura

2021

JGR Atmospheres

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“…As a result of the increased moisture connected with the system, a moisture conveyor belt (MCB) formed over the region. This shows that a large-scale movement of moisture from the ocean into the cyclonic system's interior region via MCB increased the TC's severity (Routray et al 2020). The formation of MCB plays an active role in bringing moisture from distant oceans into the inner core of the system, resulting in enhanced latent heating and storm intensi cation.…”

Section: Storm Historymentioning

confidence: 92%

Observational Study of Nisarg Cyclone Winds using Phased Array Doppler Sodar at Atigre, Kolhapur, India

Pawar

Dharmaraj

Nade³

et al. 2021

Preprint

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One of the most important parameters in meteorology is the mean wind profile in the tropical cyclone boundary layer. The signature of the Nisarg cyclone is reported in the Phased Array Doppler Sound Detection and Ranging (SODAR) data installed at the Center for Space and Atmospheric Science (CSAS), Sanjay Ghodawat University, Kolhapur (16.74° N, 74.37° E; near India's western coast). The vertical profile of wind speed and wind direction measured from the sodar system clearly reveals the signature of Nisarg cyclone during 2- 3 June 2020. Our analysis revealed that, the maximum mean wind speed was 17 m/s on 3rd June 2020 at 10:00 IST. It also shows the change in the wind direction from southwest to southeast on 2nd June 2020 and 3rd June 2020. Daily high-resolution reanalysis in the domain, 0-25°N, 65-110°E, during the period from 31st May-5th June 2020 shown the variation in atmospheric pressure of the Nisarg cyclone from 1000 to 1008 hPa, sea surface tremperature (SST) between 30 and 31°C, outgoing longwave radiation (OLR) varied between 100 and 240 Wm−2, wind speed between 3 and 15 m/s and low values of vertical wind shear (VWS) was observed to the north of the track Nisarg. These findings could aid in better understanding and forecasting in this region. The present results are initial measurements of sodar system.

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“…In this paper, the full flexibility of the RCS-IND1 framework is demonstrated for two of the cases assessed by Saxby et al (2021), namely Cyclone Fani (April 2019; pre-monsoon, e.g. Routray et al, 2020;Zhao et al, 2020;Singh et al, 2021) and Cyclone Titli (October 2018; post-monsoon, e.g. Mahala et al, 2019;Maneesha et al, 2021).…”

Section: Rcs-ind1 Performance and The Impact Of Couplingmentioning

confidence: 99%

The Regional Coupled Suite (RCS-IND1): application of a flexible regional coupled modelling framework to the Indian region at kilometre scale

et al. 2022

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Abstract. A new regional coupled modelling framework is introduced – the Regional Coupled Suite (RCS). This provides a flexible research capability with which to study the interactions between atmosphere, land, ocean, and wave processes resolved at kilometre scale, and the effect of environmental feedbacks on the evolution and impacts of multi-hazard weather events. A configuration of the RCS focussed on the Indian region, termed RCS-IND1, is introduced. RCS-IND1 includes a regional configuration of the Unified Model (UM) atmosphere, directly coupled to the JULES land surface model, on a grid with horizontal spacing of 4.4 km, enabling convection to be explicitly simulated. These are coupled through OASIS3-MCT libraries to 2.2 km grid NEMO ocean and WAVEWATCH III wave model configurations. To examine a potential approach to reduce computation cost and simplify ocean initialization, the RCS includes an alternative approach to couple the atmosphere to a lower resolution Multi-Column K-Profile Parameterization (KPP) for the ocean. Through development of a flexible modelling framework, a variety of fully and partially coupled experiments can be defined, along with traceable uncoupled simulations and options to use external input forcing in place of missing coupled components. This offers a wide scope to researchers designing sensitivity and case study assessments. Case study results are presented and assessed to demonstrate the application of RCS-IND1 to simulate two tropical cyclone cases which developed in the Bay of Bengal, namely Titli in October 2018 and Fani in April 2019. Results show realistic cyclone simulations, and that coupling can improve the cyclone track and produces more realistic intensification than uncoupled simulations for Titli but prevents sufficient intensification for Fani. Atmosphere-only UM regional simulations omit the influence of frictional heating on the boundary layer to prevent cyclone over-intensification. However, it is shown that this term can improve coupled simulations, enabling a more rigorous treatment of the near-surface energy budget to be represented. For these cases, a 1D mixed layer scheme shows similar first-order SST cooling and feedback on the cyclones to a 3D ocean. Nevertheless, the 3D ocean generally shows stronger localized cooling than the 1D ocean. Coupling with the waves has limited feedback on the atmosphere for these cases. Priorities for future model development are discussed.

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Study of an Extremely Severe Cyclonic Storm “Fani” over Bay of Bengal using regional NCUM modeling system: A case study

Cited by 17 publications

References 62 publications

Active Role of Sea Surface Temperature Changes Over the Kuroshio in the Development of Distant Tropical Cyclones in Boreal Fall

Active Role of Sea Surface Temperature Changes Over the Kuroshio in the Development of Distant Tropical Cyclones in Boreal Fall

Observational Study of Nisarg Cyclone Winds using Phased Array Doppler Sodar at Atigre, Kolhapur, India

The Regional Coupled Suite (RCS-IND1): application of a flexible regional coupled modelling framework to the Indian region at kilometre scale

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