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Evaluating the performances of cloud microphysical parameterizations in WRF for the heavy rainfall event of Kerala (2018)

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Abstract

This study evaluates the performances of four different cloud microphysical parameterization (CMP) schemes of the Weather Research and Forecasting (WRF) model at 3 km horizontal resolution (lead time up to 96 h) for the Heavy Rainfall Event (HRE) over Kerala in August 2018. The goal is to identify the major drivers for rain making mechanism and evaluate the ability of CMPs to accurately simulate the event with special emphasis on rainfall. It is found that the choice of CMP has a considerable impact on the rainfall forecast characteristics and associated convection. Results are validated against the India Meteorological Department (IMD) station data and Global Precipitation Measurement (GPM) observations and found that, among the four CMP schemes, viz., Milbrandt (MIL), Thompson Aerosol Aware (TAA), WRF double-moment 6-class scheme (WDM6) and WRF single-moment 6-class scheme (WSM6); WDM6 is the best performing scheme in terms of rainfall. It is noted that mixed phase processes are dominant in this scenario and the inability (ability) of MIL and TAA (WDM6 and WSM6) to predict the frozen hydrometeors, and thus simulating the cold rain processes realistically led to large (small) errors in the rainfall forecast. The moisture convergence was prominent in the foothills of the Western Ghats and highly influential in facilitating orography driven lifting of moisture. The moisture budget results suggest that horizontal moisture flux convergence (MFC) was the major driver of convection with WDM6 predicting the peaks of MFC most consistently with the observed Tropical Rainfall Measuring Mission (TRMM) rainfall product. Additionally, from Contiguous Rain Area analysis it is also found that the WDM6 has the least volumetric error. This is to highlight that hydrometeor distributions are strongly modulated by MFC, which further impacts the latent heat generation and rainfall over the region. Overall results infer the substantial influence of CMPs on the forecast of the Heavy Rainfall Event. The findings of this study will be highly useful for operational forecasting agencies and disaster management authorities for mitigation of damages caused by this kind of severe HREs in the future.

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Source: Daily Weather Report, IMD Thiruvananthapuram. https://www.imdtvm.gov.in/index.php?option=com_content&task=view&id=21&Itemid=35

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Abbreviations

WRF:

Weather research and forecasting

HRE:

Heavy rainfall event

CMP:

Cloud microphysical parameterization

IMD:

India Meteorological Department

GPM:

Global precipitation mission

MIL:

Milbrandt scheme

TAA:

Thompson aerosol aware scheme

WDM6:

WRF Double Moment 6-class Scheme

WSM6:

WRF Single Moment 6-class Scheme

MFC:

Moisture flux convergence

TRMM:

Tropical rainfall measuring mission

HRLDAS:

High resolution land data assimilation

NWP:

Numerical weather prediction

DTC-UPP:

Development testbed center unified post processor

WRF-ARW:

Advanced research WRF

NOAA:

National Oceanic and Atmospheric Administration

NCEP:

National Center for Environmental Prediction

FSL:

Forecast System Laboratory

GDAS:

Global data assimilation system

NASA:

National Aeronautics and Space Administration

JAXA:

Japan Aerospace Exploration Agency

CC:

Correlation coefficient

RMSE:

Root mean square error

3AR:

3 Day accumulated rainfall from 13 to 15th August

ETS:

Equitable Threat Score

HSS:

Heidke Skill Score

CRA:

Contiguous rainfall area

MSE:

Mean squared error

ECMWF:

European Centre for Medium Range Weather Forecast

ERA5:

ECMWF reanalysis 5th generation

DWR:

Doppler weather RADAR

CFAD:

Contour frequency altitude diagram

w.r.t.:

With respect to

UGC:

University Grants Commission

SERB:

Science and Engineering Research Board

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Acknowledgements

The authors are grateful to the Indian Institute of Technology Bhubaneswar for providing the infrastructure to carry out this research work. The authors acknowledge the funding support from the University Grants Commission (UGC) (Grant number A18ES09002) and the Science and Engineering Research Board (SERB) (Grant number RP-193), Government of India. The authors also acknowledge NCEP for the FNL/GDAS data used as the initial and boundary condition for the simulations. The authors are also grateful to the National Aeronautics and Space Administration (NASA) Earth Data for providing the GPM Final Run observations and TRMM 3B42 3-hourly rainfall data. The figures have been created using MATLAB (www.mathworks.com), and the algorithms are available upon request to the corresponding author.

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Correspondence to Sandeep Pattnaik.

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Chakraborty, T., Pattnaik, S., Jenamani, R.K. et al. Evaluating the performances of cloud microphysical parameterizations in WRF for the heavy rainfall event of Kerala (2018). Meteorol Atmos Phys 133, 707–737 (2021). https://doi.org/10.1007/s00703-021-00776-3

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  • DOI: https://doi.org/10.1007/s00703-021-00776-3

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