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The Effect of the Difference in Intensity and Track of Tropical Cyclone on Significant Wave Height and Wave Direction in the Southeast Indian Ocean

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The Effect of the Difference in Intensity and Track of Tropical Cyclone on Significant Wave Height and Wave Direction in the Southeast Indian Ocean Hindawi e Scientific World Journal Volume 2021, Article ID 5492048, 11 pages https://doi.org/10.1155/2021/5492048 Research Article The Effect of the Difference in Intensity and Track of Tropical Cyclone on Significant Wave Height and Wave Direction in the Southeast Indian Ocean Yosafat Donni Haryanto ,1 Nelly Florida Riama,2 Dendi Rona Purnama ,1 and Aurel Dwiyana Sigalingging1 1Department of Meteorology, School of Meteorology Climatology and Geophysics (STMKG), Jl. Perhubungan 1 No. 5, Pondok Aren, Tangerang Selatan 15221, Indonesia 2Center of Research and Development, Indonesian Agency for Meteorology Climatology and Geophysics (BMKG), Jl. Angkasa Pura 1, Kemayoran 10720, Indonesia Correspondence should be addressed to Yosafat Donni Haryanto; [email protected] Received 10 July 2020; Revised 2 February 2021; Accepted 22 February 2021; Published 3 March 2021 Academic Editor: Patrick C. McGuire Copyright © 2021 Yosafat Donni Haryanto et al. *is is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. *is study aims to analyze the effect of the differences in intensity and track of tropical cyclones upon significant wave heights and direction of ocean waves in the southeast Indian Ocean. We used the tropical cyclone data from Japan Aerospace Exploration Agency (JAXA) starting from December 1997 to November 2017. *e significant wave height and wave direction data are reanalysis data from Copernicus Marine Environment Monitoring Service (CMEMS), and the mean sea level pressure, surface wind speed, and wind direction data are reanalysis data from European Center for Medium-Range Weather Forecasts (ECMWF) from December 1997 to November 2017. *e results show that the significant wave height increases with the increasing intensity of tropical cyclones. Meanwhile, the direction of the waves is influenced by the presence of tropical cyclones when tropical cyclones enter the categories of 3, 4, and 5. Tropical cyclones that move far from land tend to have higher significant wave height and wider affected areas compared to tropical cyclones that move near the mainland following the coastline 1. Introduction cyclones in the Australian region can be found around intertropical convergence zone (ITCZ) areas. McBride and *e tropical cyclones in the Indian Ocean and the Western Keenan estimate that about 85% of cyclones in Australia Australia ocean have been formed in an average of 10 times have their origin near the ITCZ [2]. Because the ITCZ is per year [1]. *e climatology of tropical cyclones in the located near the Indonesian Maritime Continent or into the Australian region shows that the entire northern part of the north of the Australian continent for most of the tropical Australian coastline is vulnerable to the destructive effects of cyclone season, most tropical cyclones in the southeast tropical cyclones. A more complete climatology of tropical Indian Ocean are near the coast of Western Australia. cyclone events can be found in McBride and Keenan [2] and McBride and Keenan found that about half of all cyclones in Holland [3]. *ere are two main areas of cyclogenesis, their study are formed within 300 km of land [2]. namely, the western region above the eastern Indian Ocean Most tropical cyclones are formed at latitudes 10°–20° and the Timor Sea close to the Indonesian territory and the from the equator (65%) [4]. Tropical cyclones are influenced eastern region above the Coral Sea. Tropical cyclones near by the Coriolis force. *e Coriolis force vanishes at the the west coast of Australia tend to be stronger than cyclones equator, and the tropical cyclone does not cross the equator. near the east coast of Australia [3]. *e onset of most tropical However, tropical cyclones can have an indirect impact on 2 *e Scientific World Journal the surrounding area, such as storm surges. *erefore, in- Based on cyclone reports from BoM (Bureau of Mete- formation related to high waves caused by tropical cyclones orology), examples of tropical cyclones that reach category 5 is very important considering the importance of the ocean as (severe tropical cyclone) are the tropical cyclones Glenda one of the vital transportation routes. (27–31 March 2006) and Frederic (25 March‒1 April 1999). According to Zakir et al. [5], tropical regions that receive *e tropical cyclone Glenda caused various damages, such as solar radiation all year round make tropical oceans warm fallen trees, flooding, and storm tide of about 5.8 meters. and form a low-pressure system, and it can make a tropical Meanwhile, the tropical cyclone Frederic was not recorded cyclone if the wind speed near the center is 34 knots or more as cause damage due to its position far from the coastline. (63 km/h). A vortex can develop into a tropical cyclone if Both tropical cyclones have a unique track and are different supported by several parameters. Gray divides these pa- from each other. With the difference in cyclone track, we rameters into 2 categories [6]. want to analyze the effect of the differences in intensity and track of tropical cyclones on the significant wave height and (1) *ermal parameters include ocean thermal energy wave direction, especially in the southeast Indian Ocean. with sea temperatures >26°C to a depth of 60 meters, the difference in equivalent potential temperature between the surface layers with 500 hPa is more than 2. Materials and Methods 10°C, and the presence of wet air in the intermediate layer (>70% at the 700–500 hPa layers) *e research area is the southeast Indian Ocean, which is (2) Dynamic parameters include strong vorticity in the limited to coordinates of 5°S–30°S and 90°E–130°E. *is lower layer, weak vertical wind shear, and Coriolis region has the most number of tropical cyclones in the world parameter at latitude >3° [1]. *is area is directly adjacent to the Indonesian Maritime Continent, and in the east, it is bordered by the Australian Wirjohamidjojo and Sugarin [7] classified tropical cy- continent (Figure 1). clones based on the wind speed around them. *ey dis- Information related to tropical cyclone Frederic on tinguish three classes, namely, tropical depression (22–33 March 25–April 1, 1999, and tropical cyclone Glenda on knots), tropical storm (34–63 knots), and tropical cyclone March 27–31, 2006, existing in the form of a report con- (>64 knots). Meanwhile, the Bureau of Meteorology has a taining the tropical cyclone position, track, and impacts, tropical cyclone scale which is divided into 5 categories [8]. were obtained from austrliasevereweather.com. Other than *e significant wave height (SWH) was first introduced that, the tropical cyclone data were collected from December by Sverdrup and Munk as the average of the highest 1997 to November 2017. *is information was used to see one-third (33%) of waves (measured from trough to crest) the climatological conditions of tropical cyclones in the [9]. SWH is one of the important parameters for the sta- southeast Indian Ocean. Data were taken in the form of date tistical distribution of ocean waves. *e most common of occurrence, maximum wind speed, duration, and track of waves are lower in height than SWH, but waves close to tropical cyclones obtained from Japan Aerospace Explora- double this height can be expected to occur. tion Agency (JAXA). *e direction of the wave is the direction from which the *e data of significant wave height and mean wave wave approaches [10]. Waves typically propagate from the direction are obtained from the Copernicus Marine Envi- center of a storm. Some waves will move in the same di- ronment Monitoring Service (CMEMS) with a spatial res- rection as the storm, and these will likely grow bigger. Others olution of 0.2 × 0.2° and a temporal resolution of 3 hours. will head off in the opposite direction, and these will likely *is reanalysis data were taken from December 1997 to lose energy over time and fade away. November 2017. *e research about tropical cyclone tracks was per- Surface wind and mean sea level pressure reanalysis data formed by several researchers in different areas. Ramsay were obtained from the European Center for Medium- et al. [11] reported clustering tropical cyclone tracks in the Range Weather Forecasts(ECMWF) ERA-Interim. *e southern hemisphere and divided them into 7 clusters. temporal resolution is 6 hours, and the spatial resolution is Meanwhile, in the north Indian Ocean region, the tropical 0.125 × 0.125°. cyclone tracks were divided into 6 clusters by Paliwal and *e method used in this research is a descriptive method Patwardhan [12]. In the Northwest Pacific Ocean region, in the form of the case study of tropical cyclones. *is re- Camargo et al. distinguished 7 clusters of tropical cyclone search begins by identifying the tropical cyclones that were tracks [13]. chosen to be studied, namely, the tropical cyclone Frederic *e presence of tropical cyclones also influences sig- and the tropical cyclone Glenda. Furthermore, reanalysis nificant wave height in the surrounding area. Meanwhile, data were collected from CMEMS, ECMWF ERA-Interim, research on the effects of the tropical cyclone Pabuk by and tropical cyclones data from JAXA for 20 years in the Siregar et al. shows that there is a potential for high waves to research area. reach 4.5 meters to the north of Anambas Ocean and 7.0 After all the data have been collected, the next step is to meters northeast of Natuna Ocean [14]. Tropical cyclones run the data in OpenGrADS application to produce 4 affect maximum wave height also in the coastal waters of products, namely (1) climatological conditions for signifi- south Java [15]. cant wave height and wave direction, (2) significant wave *e Scientific World Journal 3 90°0′E 95°0′E 100°0′E 105°0′E 110°0′E 115°0′E 120°0′E 125°0′E 130°0′E S S ′ ′ 10°0 10°0 S S ′ ′ 15°0 15°0 S S ′ ′ 20°0 20°0 S S ′ ′ 25°0 25°0 90°0′E 95°0′E 100°0′E 105°0′E 110°0′E 115°0′E 120°0′E 125°0′E 130°0′E N Scale 1: 20.000.000 WE STMKG 0 250 500 1.000 1.500 2.000 2020 S Kilometers Land Ocean Figure 1: Map of the research area in the southeast Indian Ocean.
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