Definition of Circulation Index

[Z500 (m)]
Z500 zonal mean 20N-30N:                              0-360E, 20-30N
Z500 zonal mean 30N-40N:                              0-360E, 30-40N
Z500 zonal mean 40N-50N:                              0-360E, 40-50N
Z500 zonal mean 50N-60N:                              0-360E, 50-60N

[SST (K)]
SST NINO.1+2:                                         90-80W, 10S-0
SST NINO.3:                                           150-90W, 5S-5N
SST NINO3.4:                                          170-120W, 5S-5N
SST NINO.4:                                           160E-150W, 5S-5N
SST NINO.WEST:                                        130-150E, 0-15N
SST IOBW:                                             40-100E, 20S-20N
SST Western Tropical Indian Ocean(WTIO):              50-70E, 10S-10N
SST South-eastern Tropical Indian Ocean(SETIO):       90-110E, 10S-0
SST Indian Ocean Dipole(IOD);Dipole Mode Index(DMI):  (50-70E, 10S-10N) - (90-110E, 10S-0)
SST Northwest Indian Ocean(WIO):                      40-70E, 0-20N
SST Northeast Indian Ocean(EIO):                      70-100E, 0-20N
SST Tropical Northern Atlantic(TNA):                  55-15W, 5-25N
SST Tropical Southern Atlantic(TSA):                  30W-10E, 20S-0
SST Tropical Atlantic Dipole(TAD):                    (55-15W, 5-25N) - (30W-10E, 20S-0)

[RAIN (mm/day)]
Rain IOBW:                                            40-100E, 20S-20N
Rain Northwest Indian Ocean(WIO):                     40-70E, 0-20N
Rain Northeast Indian Ocean(EIO):                     70-100E, 0-20N
Rain SAMOI:                                           (80-105E, 5-25N) + (107.5-140E, 5-20N)
Rain WNP(WNPM):                                       110-160E, 10-20N
Rain Southeast Asia Monsoon(CI2,SEAsia):              115-140E, 10-20N
Rain Maritime Continent(MC):                          110-135E, 5S-5N
Rain Date Line(DL):                                   170-190E, 5S-5N

[Temperature calculated from Thickness (K)]
Thickness(300-850hPa) 30N-50N(THICKMID,THMD):         T(300-850hPa) calculated from Thickness 0-360E, 30-50N
Thickness(300-850hPa) 30N-90N(THICKNH,THEX):          T(300-850hPa) calculated from Thickness 0-360E, 30-90N
Thickness(100-850hPa) 25S-25N(THICKTRO;THTR):         T(100-850hPa) calculated from Thickness 0-360E, 25S-25N