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A comparison between WRF-simulated and observed surface meteorological variables across varying land cover and urbanization in south-central India

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Abstract

Changes in land use and land cover (LULC) and urbanization affect the regional energy balance. Accurate estimation of the earth's surface skin temperature and surface thermodynamic variables (temperature, T and relative humidity, RH) is essential to understand regional climate change better. The present study examined the agreeability between the Weather Research and Forecasting (WRF) model simulated surface skin temperature (TSK) and the Moderate Resolution Imaging Spectroradiometer (MODIS) satellite-derived land surface temperature (LST) over heterogeneous LULC (built-up, crop land, forest cover, and barren land) in south-central India. Model performance metrics were computed for daytime and nighttime surface temperatures in January, May, and July 2021, representing winter, summer, and monsoon seasons. Further, the study compared the WRF-simulated near-surface (2 m from surface) T and RH with the observed hourly data from 20 locations in south-central India representing Tier-I, Tier-II, and Tier-III cities (high to low urbanization) to understand the effect of urbanization. Results indicate an overall high correlation (r > 0.9) between WRF-TSK and MODIS-LST. Nighttime correlations (r > 0.55) are relatively good enough for crop and forest land-use group than daytime simulations. In general, the correlation between TSK and LST is relatively poor for barren and built-up land-use groups during all three seasons (for both daytime and nighttime). Similarly, the WRF-simulated T and RH also differ considerably from the observed data in high and moderately dense urban locations, and the seasonal biases are predominant, especially during summer and winter. The WRF-simulated surface variables are a reasonable alternative in the absence of satellite-observed or surface-measured data in better understanding the environmental processes. However, the trends in the surface meteorological variables needs to be interpreted by duly considering the impact of land use and urbanization.

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Data availability

The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.

Abbreviations

CPCB:

Central pollution control board

DEM:

Digital elevation model

GEE:

Google earth engine

LST:

Land surface temperature

LULC:

Land use and land cover

MODIS:

Moderate resolution imaging spectroradiometer

PBL:

Planetary boundary layer

RH-2m:

Near-surface relative humidity at 2 m height

RMSE:

Root mean square error

T-2m:

Near-surface air temperature at 2 m height

TSK:

Surface skin temperature

UCI:

Urban cool island

UCM:

Urban canopy model

UHI:

Urban heat island

WPS:

WRF pre-processing system

WRF:

Weather research and forecasting model

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Acknowledgements

The author acknowledges the data providers NCEP FNL, CPCB, and GEE. The Knowledge Resources Center (KRC) of CSIR National Environmental Engineering Research Institute (NEERI) is helpful in checking the similarity of the manuscript — CSIR-NEERI/KRC/2022/MAY/CTMD/3. The author is grateful to Ms. Arya and Ms. Astha for downloading the CPCB meteorological data.

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Correspondence to Rakesh Kadaverugu.

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Communicated by: H. Babaie

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Kadaverugu, R. A comparison between WRF-simulated and observed surface meteorological variables across varying land cover and urbanization in south-central India. Earth Sci Inform 16, 147–163 (2023). https://doi.org/10.1007/s12145-022-00927-z

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  • DOI: https://doi.org/10.1007/s12145-022-00927-z

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