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1、Kinetic Energy Budgets during the Rapid Intensification ofTyphoon Rammasun(2014)Xin QUAN and Xiaofan LI*Key Laboratory of Geoscience Big Data and Deep Resource of Zhejiang Province,School of Earth Sciences,Zhejiang University,Hangzhou,Zhejiang 310027,China(Received 8 March 2022;revised 23 May 2022;a
2、ccepted 30 May 2022)ABSTRACTIn this study,Typhoon Rammasun (2014)was simulated using the Weather Research and Forecasting model toexamine the kinetic energy during rapid intensification(RI).Budget analyses revealed that in the inner area of the typhoon,the conversion from symmetric divergent kinetic
3、 energy associated with the collocation of strong cyclonic circulation andinward flow led to an increase in the symmetric rotational kinetic energy in the lower troposphere.The increase in thesymmetric rotational kinetic energy in the mid and upper troposphere resulted from the upward transport of s
4、ymmetricrotational kinetic energy from the lower troposphere.In the outer area,both typhoon and Earths rotation played equallyimportant roles in the conversion from symmetric divergent kinetic energy to symmetric rotational kinetic energy in thelower troposphere.The decrease in the symmetric rotatio
5、nal kinetic energy in the upper troposphere was caused by theconversion to asymmetric rotational kinetic energy through the collocation of symmetric tangential rotational winds and theradial advection of asymmetric tangential rotational winds by radial environmental winds.Key words:Typhoon Rammasun(
6、2014),rapid intensification,kinetic energy budget,symmetric and asymmetric winds,divergent and rotational circulations,environmental flowsCitation:Quan,X.,and X.F.Li,2023:Kinetic energy budgets during the rapid intensification of Typhoon Rammasun(2014).Adv.Atmos.Sci.,40(1),7894,https:/doi.org/10.100
7、7/s00376-022-2060-z.Article Highlights:The symmetric rotational kinetic energy in the troposphere increases during the rapid intensification of TyphoonRammasun.The increase in the lower troposphere results from the conversion of symmetric divergent kinetic energy via therotational-and divergent-flow
8、 interaction.The increase in the upper troposphere is due to transport of symmetric rotational kinetic energy from the lowertroposphere by strong upward motions.1.IntroductionTyphoons may experience a rapid intensification(RI)period before landfall,which often leads to large economiclosses and death
9、s in the coastal areas.For example,the maxi-mum wind speed in the super Typhoon Rammasun(2014),which is analyzed in this study,increased from 40 m s1 to60 m s1 within 24 h before landfall at Hainan,China on 18July2014,causing a huge economic loss of over 26 billionChinese Yuan and approximately 30 d
10、eaths.To effectivelyreduce the damage caused by typhoons,accurate typhoonforecasting is required to facilitate informed governmentaldecisions before landfall.When compared to the significantimprovement in the track forecasts of tropical cyclones(TC)in recent decades,improvement in TC intensity forec
11、astshave shown relatively slower progress (Elsberry et al.,2007;Rappaport et al.,2009;DeMaria et al.,2014).The inten-sity forecasts mainly rely on numerical model guidance;how-ever,improvement of numerical predictions requires an in-depth understanding of the physical processes associatedwith the in
12、tensity change.Primary physical processes and fac-tors associated with TC intensity change include environmen-tal effects(DeMaria et al.,1993;Zeng et al.,2010;Feng etal.,2014),inner core dynamics(Montgomery and Kallen-bach,1997;Wang,2002;Miyamoto and Takemi,2015;Chen,2016;Chen et al.,2019),underlyin
13、g surface forcing(Yang et al.,2008;Cheng et al.,2012;Cheng and Wu,*Corresponding author:Xiaofan LIEmail:xiaofanlizju.eduADVANCES IN ATMOSPHERIC SCIENCES,VOL.40,JANUARY 2023,7894 Original Paper Institute of Atmospheric Physics/Chinese Academy of Sciences,and Science Press and Springer-Verlag GmbH Ger
14、many,part of Springer Nature 20232020),and convection and latent heat release(Kanada andWada,2015;Li et al.,2016).Many studies have contributed to enhancing the under-standing of dynamic processes associated with the RI ofTCs.The RI of Hurricane Opal(1995)was caused by themean vertical advection and
15、 mean vorticity flux terms(Pers-ing et al.,2002).The RI of TC Dora(2007)was related tothe superposition of potential vorticity structure of thetrough with strong deformation(Leroux et al.,2013).TheRI of Typhoon Man-yi (2013)was associated with theenhanced mesovortex under the condition of reduced st
16、aticstability (Wada,2015).The RI of Typhoon Megi (2010)resulted from strengthened rotational circulations in the midand upper troposphere through the transport of vorticity(Chang and Wu,2017).The RI of Typhoon Vicente(2012)was largely affected by an upper-tropospheric “inverted”trough(Shieh et al.,2
17、013).The analysis of the asymmetricimpacts at multiple scales during RI found that the changesin asymmetric circulations were associated with the baroclinicconversion from available potential to kinetic energies,andthe conversion between asymmetric kinetic energies(Pras-anth et al.,2020).Budgets of
18、tangential wind,vorticity,and kineticenergy have been analyzed to examine dynamic processesassociated with the RI in previous studies.The RI ofVicente was related to mean radial flux of absolute mean verti-cal vorticity and vertical advection of the azimuthal mean tan-gential wind by the azimuthal m
19、ean vertical motion in theazimuthal mean tangential wind budget(Chen et al.,2017),and to tilting of the horizontal vorticity and upward vorticityadvection in the mean vorticity budget of circular area(Chen et al.,2018).The positive tendency of the TC kineticenergy associated with the RI of Typhoon H
20、ato (2017)resulted mainly from the conversion of kinetic energy oflarge-scale circulations in the barotropic eddy kineticenergy equation(Zhang et al.,2019).Previous studies have focused on the analyses of RImechanisms using analyses that have been carried out in theinner core of the tropical cyclone
21、 where maximum windsare located.In the current case study of Typhoon Rammasun(2014),kinetic energy budgets in outer area during RI arealso examined in addition to the analyses in the inner region.The questions that are discussed in this study are:How dokinetic energies during RI change vertically an
22、d horizon-tally?What dynamic processes control the kinetic energychanges in inner and outer areas and in the lower,middle,and upper troposphere during RI?The paper is organized as follows.An overview ofsuper Typhoon Rammasun(2014)is presented,the modelsimulation design is introduced,and a comparison
23、 betweenobservations and simulations is presented in section 2.Thevertical structures of kinetic energy budgets are analyzed insection 3,and the dominant dynamic terms in kinetic energybudgets are discussed in-depth through partitioned analysisin section 4.Lastly,a summary is given in section 5.2.Ov
24、erview of Typhoon Rammasun (2014),model design,and kinetic energy budgetsTyphoon Rammasun(2014)originated in the northwestPacific Ocean at 1400 Local Standard Time(LST;LST=UTC+8)on 12 July 2014 and moved westward,developinginto a severe typhoon.The first landfall was made on thesouthern Luzon Island
25、 of the Philippines at 1700 LST on 15July.Rammasun(2014)weakened to a typhoon followinglanding,continued to move northwestward after 1400 LSTon 17 July,and subsequently began to strengthen rapidly.Itdeveloped into a super typhoon at 1000 LST on 18 July andlanded at Wenchang,Hainan,China at 1400 LST.
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