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Coastal Sea Level Response to the Tropical Cyclonic Forcing in the North Indian Ocean’ by Mehta Et Al
16 April 2014 To The Editor Ocean Science Sub: Reply to the comments of reviewer#2 on ’Coastal sea level response to the tropical cyclonic forcing in the north Indian Ocean’ by Mehta et al. (OSD). Sir, Kindly find the reply to the comments of reviewer#2 on the manuscript submitted by Mehra et al. (OSD) entitled "Coastal sea level response to the tropical cyclonic forcing in the north Indian Ocean". Thanks & regards Prakash Mehra NIO, Goa, India Interactive comment on “Coastal sea level response to the tropical cyclonic forcing in the north Indian Ocean” by P. Mehra et al. Anonymous Referee #2 Received and published: 22 March 2014 Reviewer's comment: This paper describes and analyses the coastal sea level response to two storm events at the end of 2011 in the north Indian Ocean. The authors use the sea level and atmospheric observations at 9 locations along the Indian coast and perform a classical but robust analysis (spectral analyses and multi-linear regression). Although there are no new findings, it gives a fair idea of the causes of the sea level variation in response to these strong atmospheric events. The Figures, Tables and References are clear and support well the present text. It is also interesting to have an analysis done at large scale and on both sides of the Indian Subcontinent (Arabian Sea and Bay of Bengal). The scientific quality of the paper is good but in my opinion the presentation of the results is poor and makes the paper hard to read and the purpose of the authors difficult to follow. -
Analysis of Average Rainfall Super Cyclone by Using Double Integration Technique
International Journal of Scientific Research in ___________________________ Research Paper . Mathematical and Statistical Sciences Volume-7, Issue-2, pp.82-85, April (2020) E-ISSN: 2348-4519 DOI: https://doi.org/10.26438/ijsrmss/v7i2.8285 Analysis of Average Rainfall Super Cyclone by using Double Integration Technique A. Tiwari1, Y. K. Rajoria2*, R. Boadh3, R. Singh4 1,2,3,4 Department of Mathematics, KR Mangalam University, Gurugram, Haryana, India *Corresponding Author: [email protected] Tel.: +91 9897108103 Available online at: www.isroset.org Received: 06/Mar/2020, Accepted: 10/Apr/2020, Online: 30/Apr/2020 Abstract— Cyclones are highly calamitous weather phenomena initiating harm to the life and physical organization in tropical seafaring countries. Cyclones form over whole-hearted tropical oceans and change to the land under the act of routing forces. India's eastern coastline is one of the most violent wind inclined regions on the planet. Despite the fact that the coastline of Orisha has been just about 17% of the Indian eastern coastline, yet Orisha has been influenced by about 35% of all cyclonic and serious cyclonic tempests that have crossed the eastern coastline and related tempest floods that have been regularly immersing huge areas along the coasts. A Cyclone is an enormous scale air mass that turns around a solid focal point of low climatic weight caused due to low atmospheric pressure over oceans resulting in rainfall in the coastal regions. The results of this study indicate that the double integration technique has good potential for calculating the average rainfall during the super cyclone. Keywords—Tempests, Tropical Cyclone, Super Cyclone, Rainfall, Double IntegrationTechinque I. -
Study Report on Gaja Cyclone 2018 Study Report on Gaja Cyclone 2018
Study Report on Gaja Cyclone 2018 Study Report on Gaja Cyclone 2018 A publication of: National Disaster Management Authority Ministry of Home Affairs Government of India NDMA Bhawan A-1, Safdarjung Enclave New Delhi - 110029 September 2019 Study Report on Gaja Cyclone 2018 National Disaster Management Authority Ministry of Home Affairs Government of India Table of Content Sl No. Subject Page Number Foreword vii Acknowledgement ix Executive Summary xi Chapter 1 Introduction 1 Chapter 2 Cyclone Gaja 13 Chapter 3 Preparedness 19 Chapter 4 Impact of the Cyclone Gaja 33 Chapter 5 Response 37 Chapter 6 Analysis of Cyclone Gaja 43 Chapter 7 Best Practices 51 Chapter 8 Lessons Learnt & Recommendations 55 References 59 jk"Vªh; vkink izca/u izkf/dj.k National Disaster Management Authority Hkkjr ljdkj Government of India FOREWORD In India, tropical cyclones are one of the common hydro-meteorological hazards. Owing to its long coastline, high density of population and large number of urban centers along the coast, tropical cyclones over the time are having a greater impact on the community and damage the infrastructure. Secondly, the climate change is warming up oceans to increase both the intensity and frequency of cyclones. Hence, it is important to garner all the information and critically assess the impact and manangement of the cyclones. Cyclone Gaja was one of the major cyclones to hit the Tamil Nadu coast in November 2018. It lfeft a devastating tale of destruction on the cyclone path damaging houses, critical infrastructure for essential services, uprooting trees, affecting livelihoods etc in its trail. However, the loss of life was limited. -
Chasing the Cyclone
Chasing the Cyclone MRUTYUNJAY MOHAPATRA DIRECTOR GENERAL OF METEOROLOGY INDIA METEOROLOGICAL DEPARTMENT NEW DELHI-110003 [email protected] 2 A Few Facts about Tropical Cyclones(TCs) During 1970-2019, 33% of hydromet. disasters are caused by TCs. One out of three events that killed most people globally is TC. Seven out of ten disasters that caused biggest economic losses in the world from 1970-2019 are TCs. It is the key interest of 85 WMO Members prone to TCs Casualties of 300,000 in Bangladesh in 1970 is still ranked as the biggest casualties for the last five decades due to TC; Cyclone Monitoring, forecasting and warning services deals with application of all available modern technologies into operational services. Cyclone Hazard Analysis Cyclone Hazard Prone Districts Based on Frequency Intensity Wind strength PMP PMSS Mohapatra (2015), JESS Cyclone A low pressure system, where the wind rotates in anticlockwise (clockwise) direction in northern (southern) hemisphere with a minimum sustained wind speed of 34 knots (62 kmph) World Meteorological Organization’s official definition : A tropical cyclone (hurricane, typhoon) is a synoptic scale (100 km) , . non-frontal (no sharp gradient of temperature) disturbance, . over tropical or subtropical waters , . with organized convection, and definite cyclonic surface wind circulation. WESTERN PACIFIC TYPHOONS AUSTRALIA WILLY-WILLIES MEXICO CORDONAZO PHILIPPINES BAGIOUS Named after a city ‘BAGUIO’which experienced a rain fall of 116.8 cm in 24 hrs in July, 1911 INDIAN SEAS CYCLONES Derived from Greek word ‘CYCLOS’ – Coil of a Snake ATLANTIC & HURRICANES Derived from ‘HURACON’ - God of Evil (central EASTERN PACIFIC American ancient aborigines call God of Evil as HURACON Eye Tropical cyclone Eye-wall Horizontal : 100-1000km Vertical :10-15 km Wind speed : UP to 300 km / hr Average storm speed : About 300 km / day EYE: Central part, is known as eye. -
Press Release-5
Government of India Earth System Science Organisation Ministry of Earth Sciences India Meteorological Department Earth System Science Organisation PRESS RELEASE-5 Time of issue: 1330 hours IST Dated: 28-10-2019 Sub: (a) Super Cyclonic Storm over eastcentral Arabian Sea to weaken gradually from 28th evening and (b) development of fresh low pressure area over Equatorial Indian Ocean to the south of Sri Lanka (a) Super Cyclonic Storm over eastcentral Arabian Sea to weaken gradually from 28th evening Yesterday’s Super Cyclonic Storm “KYARR” (pronounced as KYARR) over eastcentral Arabian Sea moved west-northwestwards and lay centered near latitude 18.2°N and longitude 65.0°E over eastcentral Arabian Sea, about 830 km west-southwest of Mumbai (Maharashtra), 1160 km east-northeast of Salalah (Oman) and 690 km east-southeast of Masirah (Oman). It is very likely to move west-northwestwards till 30th October re-curve west- southwestwards thereafter and move towards Gulf of Aden off south Oman-Yemen coasts during subsequent 3 days. It is very likely to maintain the intensity of a Super Cyclonic Storm till 28th October evening and weaken gradually thereafter. Forecast track and intensity are given in the following table: Date/Time(IST) Position Maximum sustained Category of cyclonic disturbance (Lat. 0N/ long. surface 0E) wind speed (Kmph) 28.10.19/0830 18.2/65.0 230-240 gusting to 265 Super Cyclonic Storm 28.10.19/1130 18.4/64.8 220-230 gusting to 255 Super Cyclonic Storm 28.10.19/1730 18.6/64.3 210-220 gusting to 240 Extremely Severe Cyclonic Storm -
Cyclone Nivar - Important Facts
Cyclone Nivar - Important Facts Cyclone Nivar is a ‘severe cyclonic storm’ that is expected to hit the southeastern coast of India on midnight of 25th November 2020. Cyclones and other natural disasters that affect India and the world are important topics for the UPSC exam. It is important for both the geography and the disaster management topics in the UPSC syllabus. Cyclone Nivar The India Meteorological Department (IMD) has stated that the severe cyclone Nivar will intensify into a ‘very severe cyclonic storm’ and make landfall between Mamallapuram (in Tamil Nadu, around 56 km from Chennai) and Karaikal in Puducherry, on 25th November at midnight or early hours of the 26th of November. • The Tamil Nadu and Puducherry coasts are experiencing heavy rains and strong winds due to the impending cyclone. Many parts of the metropolitan city of Chennai have been flooded due to the heavy rainfall. • The winds that the cyclone brings could be between 120 and 130 km per hour, with gusts of up to 145 km per hour. • Officials had stated they would release water from the Chembarambakkam reservoir near Chennai due to the heavy rain received in the wake of Nivar. • People living in low-lying areas have been evacuated. • The Indian Army has sent teams and rescue boats to the affected areas for assistance in the aftermath of the landfall. • Thousands of people have been evacuated as a precautionary measure. • Trains and flights have been cancelled owing to the cyclone. • Experts say that after landfall, the cyclone may take up to six hours to weaken. -
Coastal Sea Level Response to the Tropical Cyclonic Forcing in the North
Discussion Paper | Discussion Paper | Discussion Paper | Discussion Paper | Ocean Sci. Discuss., 11, 575–611, 2014 Open Access www.ocean-sci-discuss.net/11/575/2014/ Ocean Science doi:10.5194/osd-11-575-2014 Discussions © Author(s) 2014. CC Attribution 3.0 License. This discussion paper is/has been under review for the journal Ocean Science (OS). Please refer to the corresponding final paper in OS if available. Coastal sea level response to the tropical cyclonic forcing in the north Indian Ocean P. Mehra1, S. Mohan1, P. Vethamony1, K. Vijaykumar1, T. M. Balakrishnan Nair2, Y. Agarvadekar1, K. Jyoti1, K. Sudheesh1, R. Luis1, S. Lobo1, and B. Harmalkar1 1CSIR-National Institute of Oceanography (NIO), Goa, India 2Indian National Centre for Ocean Information Services (INCOIS), Hyderabad, Goa, India Received: 13 December 2013 – Accepted: 27 January 2014 – Published: 20 February 2014 Correspondence to: P. Mehra ([email protected]) Published by Copernicus Publications on behalf of the European Geosciences Union. 575 Discussion Paper | Discussion Paper | Discussion Paper | Discussion Paper | Abstract The study examines the observed storm-generated sea-level variation due to deep depression (Event-E1) in the Arabian Sea from 26 November–1 December 2011 and a cyclonic storm “THANE” (Event-E2) over the Bay of Bengal during 25–31 Decem- 5 ber 2011. The sea-level and surface meteorological measurements collected during these extreme events exhibit strong synoptic disturbances leading to storm surge up to 43 cm on the west coast and 29 cm on the east coast of India due to E1 and E2. E1 generated sea level oscillations at the measuring stations on the west coast (Ratnagiri, Verem and Karwar) and east coast (Mandapam and Tuticorin) of India with significant 10 energy bands centered at periods of 92, 43 and 23 min. -
IJRAR Research Journal
© 2020 IJRAR June 2020, Volume 7, Issue 2 www.ijrar.org (E-ISSN 2348-1269, P- ISSN 2349-5138) KOLKATA GREENS, POST ‘AMPHAN’ SUPATRA SEN Associate Professor Department of Botany Asutosh College, Kolkata, INDIA Abstract : Amphan, a tropical super cyclone ravaged coastal Bengal, Orissa and parts of Bangladesh on 20th May 2020. Kolkata along with coastal parts of West Bengal were the worst affected with lakhs rendered homeless and shelterless, huge agricultural and crop loss and thousands of trees damaged, destroyed and uprooted. With over 5000 trees lost or damaged out of approximately five lakhs in Kolkata alone, the task of green restoration seems is challenging, but essential. Post Amphan minus the large tree cover, Kolkata and surroundings will inevitably face drastic rise in pollution levels. As Kolkata rebuilds its green cover, it must ensure flawless urban planning, efficient and scientific tree management and accurate species selection. IndexTerms - Amphan, urban greening, biodiversity restoration, urban biodiversity I. INTRODUCTION Amphan, a tropical super cyclone ravaged coastal Bengal, Orissa and parts of Bangladesh on 20th May 2020. North and South 24 Parganas and East Midnapore districts of West Bengal were the worst affected with lakhs rendered homeless and shelterless, huge agricultural and crop loss, thousands of trees damaged, destroyed and uprooted and other accompanying damages and losses much beyond immediate comprehension and repair. Ironically the super cyclone hit the states and its inhabitants (flora and fauna included) on 20th May, 2020 just a couple of days before the International Day of Biological Diversity (celebrated on 22nd May, every year). Kolkata with less than 2% green cover has been one of the worst affected in terms of tree loss along with the mangrove dominated Biosphere Reserve Sunderban. -
Very Severe Cyclone Yaas to Hit North Odisha Coast
Brewing worry: The Indian Coast Guard guiding fishermen in view of cyclone Yaas. * PTI Very severe cyclone Yaas to hit north Odisha coast PM reviews preparations; landfall likely on May 26 evening shiv sahay singh coasts from the evening of in offshore activities. He Kolkata May 24. “It would gradually spoke about the need to en- The depression over east- increase further becoming sure that time duration of central Bay of Bengal is very 90-100 gusting to 110 kmph outages of power supply and likely to move in a north- from 26th morning and in- communication network are northwest direction and in- crease thereafter becoming minimum and are restored tensify into a cyclonic storm. 155-165 kmph gusting to 185 swiftly,” the Prime Minister’s The system Yaas is expected kmph at the time of landfall Office said in a statement af- to cross the coast in north till 26th afternoon,“ a special ter a review meeting to over- Odisha-West Bengal bet- bulletin issued by the IMD see the preparedness with ween Paradip and the Sagar late on Sunday evening said. senior officials. islands by the evening of The weather office has is- May 26 as a very severe cy- PM holds review meet sued an orange warning of clonic storm. Prime Minister Narendra extremely heavy rainfall at Officials at the Regional Modi on Sunday directed se- isolated places over Jhar- Meteorological Centre in nior officers to work in close gram, Medinipur, North & Kolkata on Sunday issued coordination with the States south 24 Parganas, Howrah, warnings that squally winds to ensure safe evacuation of Hooghly, Kolkata in West of 40-50 kmph gusting to 60 people from high-risk areas. -
NUMERICAL SIMULATION of TROPICAL CYCLONES and STORM SURGES in the ARABIANSEA Mohsen Soltanpour, K
36th International Conference on Coastal Engineering K. N. Toosi University of Technology Waseda University Tehran University NUMERICAL SIMULATION OF TROPICAL CYCLONES AND STORM SURGES IN THE ARABIANSEA Mohsen Soltanpour, K. N. Toosi University of Technology Zahra Ranji, K. N. Toosi University of Technology Tomoya Shibayama, Waseda University Sarmad Ghader, University of Tehran Shinsaku Nishizaki, Waseda University Study Area Motivation Numerical Simulation Conclusion 1/19 20 Cyclones and Depressions Study Area 15 Motivation 10 Numerical 5 Simulation Frequency of occurence (percent) ofoccurence Frequency 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Conclusion 30 Sever Cyclonic Storms 25 20 2/19 15 10 5 Frequency of occurence (percent) ofoccurence Frequency 0 Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Target Study Area Motivation Gonu, 2007 Cyclones Ashobaa, 2015 Numerical Simulation Conclusion 3/19 Study Area Field Measurements (Gonu) Motivation Chabahar Bay Numerical Simulation Conclusion 4/19 Study Area Motivation Numerical More severe Simulation cyclonic storms since 2000 Conclusion 6/19 Time History of Maximum Wind Speed during Cyclone Modelling Study Area Atmosphere Framework Model (WRF) Motivation Numerical Simulation WAVE Model Current vector Ocean Circulation Conclusion (SWAN, SWAVE) Radiation Stress Model (FVCOM) Boundary Boundary condition condition 7/19 Global Global Wave Model Tide Model (WWIII) (TPXO 8) Study Area Motivation Numerical WRF domain Simulation Conclusion 8/19 FVCOM, SWAVE, SWAN domain WRF Model Study -
Chlorophyll-A, SST and Particulate Organic Carbon in Response to the Cyclone Amphan in the Bay of Bengal
J. Earth Syst. Sci. (2021) 130:157 Ó Indian Academy of Sciences https://doi.org/10.1007/s12040-021-01668-1 (0123456789().,-volV)(0123456789().,-volV) Chlorophyll-a, SST and particulate organic carbon in response to the cyclone Amphan in the Bay of Bengal 1, 2 1 MD RONY GOLDER * ,MD SHAHIN HOSSAIN SHUVA ,MUHAMMAD ABDUR ROUF , 2 3 MOHAMMAD MUSLEM UDDIN ,SAYEDA KAMRUNNAHAR BRISTY and 1 JOYANTA BIR 1Fisheries and Marine Resource Technology Discipline, Khulna University, Khulna 9208, Bangladesh. 2Department of Oceanography, University of Chittagong, Chittagong 4331, Bangladesh. 3Development Studies Discipline, Khulna University, Khulna 9208, Bangladesh. *Corresponding author. e-mail: [email protected] MS received 11 November 2020; revised 20 April 2021; accepted 24 April 2021 This study aims to explore the variation of Chlorophyll-a (Chl-a), particulate organic carbon (POC) and sea surface temperature (SST) before (pre-cyclone) and after (post-cyclone) the cyclone Amphan in the Bay of Bengal (BoB). Moderate Resolution Imaging Spectroradiometer (MODIS) Aqua satellite level-3 data were used to assess the variability of the mentioned parameters. Chl-a concentration was observed to be significantly (t = À3.16, df & 18.03, p = 0.005) high (peak 2.30 mg/m3) during the post-cyclone period compared to the pre-cyclone (0.19 mg/m3). Similarly, POC concentration was significantly (t = 3.41, df & 18.06, p = 0.003) high (peak 464 mg/m3) during the post-cyclone compared to the pre-cyclone (59.40 mg/m3). Comparatively, high SST was observed during the pre-cyclone period and decreases drastically with a significant difference (t = 14, df = 33, p = 1.951e-15) after the post-cyclone period. -
“Amphan” Into a Super Cyclone?
Preprints (www.preprints.org) | NOT PEER-REVIEWED | Posted: 3 July 2020 doi:10.20944/preprints202007.0033.v1 Did COVID-19 lockdown brew “Amphan” into a super cyclone? V. Vinoj* and D. Swain School of Earth, Ocean and Climate Sciences Indian Institute of Technology Bhubaneswar *Email: [email protected] The world witnessed one of the largest lockdowns in the history of mankind ever, spread over months in an attempt to contain the contact spreading of the novel coronavirus induced COVID-19. As billions around the world stood witness to the staggered lockdown measures, a storm brewed up in the urns of the rather hot Bay of Bengal (BoB) in the Indian Ocean realm. When Thailand proposed the name “Amphan” (pronounced as “Um-pun” meaning ‘the sky’), way back in 2004, little did they realize that it was the christening of the 1st super cyclone (Category-5 hurricane) of the century in this region and the strongest on the globe this year. At the peak, Amphan clocked wind speeds of 168 mph (Joint Typhoon Warning Center) with the pressure drop to 925 h.Pa. What started as a depression in the southeast BoB at 00 UTC on 16th May 2020 developed into a Super Cyclone in less than 48 hours and finally made landfall in the evening hours of 20th May 2020 through the Sundarbans between West Bengal and Bangladesh. Did the impact of the COVID-19 induced lockdown drive an otherwise typical pre-monsoon tropical depression into a super cyclone? Global Warming and Tropical Cyclones Tropical cyclones are primarily fueled by the heat released by the oceans.