TY - JOUR
T1 - A Method for Diagnosing the Secondary Circulation with Saturated Moist Entropy Structure in a Mature Tropical Cyclone
AU - Huang, Yiwu
AU - Duan, Yihong
AU - Chan, Johnny C. L.
AU - Bao, Xuwei
PY - 2019/8
Y1 - 2019/8
N2 - Under the adiabatic, axisymmetric and steady assumption, a relationship between the saturated moist entropy structure and the secondary circulation in a tropical cyclone (TC) is derived from the continuity equation. It is found that the isentropic surfaces coincide with the streamlines, and the streamfunction can be expressed with saturated moist entropy. The secondary circulation and the saturated moist entropy structure depend on each other. Thus, a method for diagnosing the secondary circulation with the structure of saturated moist entropy is proposed. The method is verified with a simulated intense ideal-ized TC with a highly axisymmetric structure. The diagnosed secondary circulation reproduces well the moist inflow in the boundary layer and the moist updraft in the eyewall. This method facilitates secondary circulation diagnosis in theoretical or mature TCs that satisfy the adiabatic, axisymmetric and steady approximations.
AB - Under the adiabatic, axisymmetric and steady assumption, a relationship between the saturated moist entropy structure and the secondary circulation in a tropical cyclone (TC) is derived from the continuity equation. It is found that the isentropic surfaces coincide with the streamlines, and the streamfunction can be expressed with saturated moist entropy. The secondary circulation and the saturated moist entropy structure depend on each other. Thus, a method for diagnosing the secondary circulation with the structure of saturated moist entropy is proposed. The method is verified with a simulated intense ideal-ized TC with a highly axisymmetric structure. The diagnosed secondary circulation reproduces well the moist inflow in the boundary layer and the moist updraft in the eyewall. This method facilitates secondary circulation diagnosis in theoretical or mature TCs that satisfy the adiabatic, axisymmetric and steady approximations.
KW - diagnosis method
KW - saturated moist entropy structure
KW - secondary circulation
KW - tropical cyclone
UR - http://www.scopus.com/inward/record.url?scp=85068765202&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85068765202&origin=recordpage
U2 - 10.1007/s00376-019-9054-5
DO - 10.1007/s00376-019-9054-5
M3 - RGC 21 - Publication in refereed journal
SN - 0256-1530
VL - 36
SP - 804
EP - 810
JO - Advances in Atmospheric Sciences
JF - Advances in Atmospheric Sciences
IS - 8
ER -