Ms. Trinah Wati Profile

Trinah Wati

at BMKG

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Proceedings Article | 24 December 2019 Paper

Verification of radar and gauge precipitation data in Ciliwung watershed

Trinah Wati, . Fatkhuroyan, . Apip, Endang D. Arinio, Yanuar Pribadi

Proceedings Volume 11372, 113720M (2019) https://doi.org/10.1117/12.2540949

KEYWORDS: Radar, Meteorology, Satellites, Ranging, Error analysis, Meteorological satellites, Floods, Modeling, Spatial resolution, Hydrology

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The estimation of precipitation using weather satellite is beneficial to measure global rainfall with high temporal and spatial resolution. The understanding of accuracies and limitations of precipitation satellite data is essential to study by verifying the satellite estimation with the observation data from rain gauges. The aim of this study is to verify the radar and rain gauges rainfall data in rainy season (December 2013 to March 2014), which consist three approaches namely point-to-grid, area-weighted and grid-to-grid for daily interval in Ciliwung watershed and point-to-grid for hourly interval in Darmaga and Pondok Betung stations. The verification methods consist of two namely continuous verification statistics and categorical verification statistics. The result of continuous verification statictic shows the highest correlation is point-to-grid and the variability of errors are from 0 to 45.76 according to magnitude of MAE. The radar rainfall are underestimated to observation with ME negatives. The categorical verification statistics shows that accuracies of those three approaches have the average of 0.44 and biases below 1.5. The correlations in hourly interval with point-to-grid approach in Pondok Betung and Darmaga are lower than daily interval, while the accuracies are higher. The application of remote sensing such as radar technology, satellite precipitation estimation feasible to detail rainfall data in a watershed, especially in locations which observation stations are not available.

Proceedings Article | 24 December 2019 Paper

Evaluation of the WRF applied on urban heat islands coupled to Noah-MP land surface models over Jakarta

* Fatkhuroyan, Jaka A. I. Paski, Rezky Yunita, Trinah Wati, Erwin Makmur

Proceedings Volume 11372, 113720T (2019) https://doi.org/10.1117/12.2542744

KEYWORDS: Performance modeling, Spatial resolution, Skin, Temperature metrology

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Jakarta area with high built-up areas and CO₂ emission cause urban heat island (UHI). The characteristics of UHI, such as temperature and wind must be known in order to overcome UHI problems. In this study, urban heat islands in Jakarta is simulated using Weather Research and Forecasting (WRF) model coupled with Noah-MP Land surface model. The aim of the study is to evaluate the WRF-urban modeling system’s performance. The method used is by conducting Building Effect Parameterization (BEP) scheme experiments in WRF simulation with high spatial resolution (1 km horizontal grid spacing) then compare to observation data during vernal equinox day (day without a shadow) on 14th – 16th March 2018 and 8th - 10th Oct 2018 over Jakarta metropolitan area. The results show that the correlation of near-surface air temperature and wind speed in March is better than in October, while the wind direction has a better correlation in October. Concerning the urban areas, Central and west Jakarta has the highest temperature area on March 15 th ,2018, with the highest temperature was 32.7°C at Kemayoran. Meanwhile, only west Jakarta area has the highest temperature (>32°C) on October 9th 2018, with the highest temperature was 32.16°C at Cengkareng.

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