A Comparative Study Between Regional Atmospheric Model Simulations Coupled and Uncoupled to a Regional Ocean Model of the Indian Summer Monsoon

Jayasankar, C. B.; Misra, Vasubandhu; Karmakar, Nirupam

doi:10.1029/2022ea002733

Cited by 3 publications

(1 citation statement)

References 96 publications

(142 reference statements)

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“…Both the URSM and CRSM have been forced at the lateral boundaries with integrations of the Community Climate System Model version 4 (CCSM4; Gent et al, 2011), which was part of the Coupled Model Intercomparison Project version 5 (CMIP5; Taylor et al, 2012). It has been shown that the CCSM4 model that participated in CMIP5 was one of the five top-ranked models in simulating the present-day global climate (Sheffield et al, 2013) and is widely used for dynamical downscaling over various regions Jayasankar et al, 2023). The atmospheric component of the RCM is forced at 6-h intervals while the oceanic component of the RCM is forced at monthly intervals with the boundary conditions provided by the corresponding components of CCSM4.…”

Section: Model Detailsmentioning

confidence: 99%

Heat waves in Florida and their future from high‐resolution regional climate model integrations

Beasley,

Misra,

Jayasankar

et al. 2023

Intl Journal of Climatology

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This study examines the simulation of the heatwave events over Florida from the integration of two regional climate models (RCMs) at comparatively high resolution (at 10 km grid spacing) for two decades of the current climate (1986–2005) followed by their projection in the mid‐21st century (2041–2060). The two RCMs are coupled ocean–atmosphere (CRSM) and atmosphere only (URSM), which are forced at the lateral boundaries by the corresponding simulation of the Community Climate System Model v4 (CCSM4) for both the atmosphere and the ocean. The analysis reveals a reasonable simulation of the frequency, intensity and characteristic kinematic and thermodynamic features of the heatwave events over Florida from both the RCMs with the differences between URSM and CRSM being insignificant. The future projections (2041–2060) are presented only for URSM since the projected differences from CRSM were insignificant. We found the projected change of higher frequency ranging between 20 to over 50% increase relative to the late 20th‐century frequency of heatwave events. Similarly, the projections suggest a broadening of the season of their occurrence by over 2 months. These projected changes are associated with a projected increase in the mean surface temperature, a slight increase of surface humidity but with a mean reduction of surface relative humidity, and a westward dislocation of the North Atlantic Subtropical High.

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Section: Model Detailsmentioning

confidence: 99%

Heat waves in Florida and their future from high‐resolution regional climate model integrations

Beasley,

Misra,

Jayasankar

et al. 2023

Intl Journal of Climatology

Self Cite

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Projected Changes in Diurnal Temperature Range Over India Using a Coupled Ocean–Atmosphere Regional Climate Model

Jayasankar,

Misra

2024

Intl Journal of Climatology

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This study investigates the projected changes in the diurnal temperature range (DTR) over India and explains its considerable spatial heterogeneity from a 20‐km resolution coupled regional climate model (RSM‐ROMS) integration. The RSM‐ROMS is driven at the lateral boundaries by the Community Climate System Model version 4 (CCSM4) model. Observations reveal spatial heterogeneity in DTR trends with significant declining trends at many grid points interspersed with areas of either increasing or insignificant trends of DTR during each of the four seasons. The present‐day simulations from RSM‐ROMS show reasonable skill in simulating the daily maximum temperature (Tmax) and minimum temperature (Tmin) over India. Our results show a significant decrease in DTR over the Gangetic Plains in boreal winter and fall seasons and over southeastern India during boreal summer in the projected mid‐21st century climate under the RCP 8.5 emission scenario. The future reduction in DTR over Region‐1 (over Bihar and the eastern regions of Uttar Pradesh) during December–February (−0.86°C) and over Region‐3 (over the rain shadow regions of Peninsular India) during June–September (−0.49°C) is attributed to large changes in surface radiative fluxes, with some of the decrease in downward short wave flux attributed to an increase in high cloud cover at the time of Tmax while there is a considerable increase in downward longwave flux in the mid‐21st century climate. The enthalpy fluxes at the time of Tmax also act to reduce the rate of its warming. As a result, the warming rate of Tmax is less compared with the corresponding warming rate of Tmin, which leads to a reduction of the DTR in some regions that display a significant reduction in future climate. In contrast, Region‐2 (over Rajasthan) and Region‐4 (over northeast India) exhibit insignificant DTR changes in the mid‐21st century climate for lack of asymmetrical changes in Tmin and Tmax.

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The regional coupled ocean-atmosphere model simulation over Eastern Tropical Africa

Misra,

Jayasankar

2025

Dynamics of Atmospheres and Oceans

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A Comparative Study Between Regional Atmospheric Model Simulations Coupled and Uncoupled to a Regional Ocean Model of the Indian Summer Monsoon

Cited by 3 publications

References 96 publications

Heat waves in Florida and their future from high‐resolution regional climate model integrations

Heat waves in Florida and their future from high‐resolution regional climate model integrations

Projected Changes in Diurnal Temperature Range Over India Using a Coupled Ocean–Atmosphere Regional Climate Model

The regional coupled ocean-atmosphere model simulation over Eastern Tropical Africa

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