Index number là gì

SOI

The Southern Oscillation Index (SOI) is a standardized index based on the observed sea màn chơi pressure differences between Tahiti & Darwin, Australia. The SOI is one measure of the large-scale fluctuations in air pressure occurring between the western và eastern tropical Pacific (i.e., the state of the Southern Oscillation) during El Niño & La Niña episodes. In general, smoothed time series of the SOI correspond very well with changes in ocean temperatures across the eastern tropical Pacific.

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The negative sầu phase of the SOI represents below-normal air pressure at Tahiti và above-normal air pressure at Darwin. Prolonged periods of negative sầu (positive) SOI values coincide with abnormally warm (cold) ocean waters across the eastern tropical Pacific typical of El Niño (La Niña) episodes. The methodology used to lớn calculate SOI is available below. More information can be found at the Climate Prediction Center SOI page.

Place mouse on axis and left-click lớn pan; wheel up/down for zoom in/out (or shift key+left-click).

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Source: https://www.cpc.ncep.theartinpixels.com.gov/data/indices/soi

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Expvà Data Table

DateSOI
195101+1.5
195102+0.9
195103-0.1
195104-0.3
195105-0.7
195106+0.2
195107-1.0
195108-0.2
195109-1.1
195110-1.0
195111-0.8
195112-0.7
195201-0.9
195202-0.6
195203+0.5
195204-0.2
195205+0.8
195206+0.7
195207+0.5
195208+0.1
195209-0.2
195210+0.4
1952110.0
195212-1.2
195301+0.3
195302-0.5
195303-0.2
195304+0.2
195305-1.7
195306+0.1
195307-0.0
195308-1.2
195309-1.2
195310+0.1
195311-0.3
195312-0.5
195401+0.7
195402-0.3
195403+0.3
195404+0.6
195405+0.5
195406+0.1
195407+0.4
195408+1.1
195409+0.2
195410+0.3
195411+0.1
195412+1.4
195501-0.5
195502+1.9
195503+0.6
195504-0.1
195505+1.0
195506+1.3
195507+1.6
195508+1.5
195509+1.3
195510+1.5
195511+1.2
195512+1.0
195601+1.3
195602+1.6
195603+1.3
195604+0.9
195605+1.4
195606+1.1
195607+1.1
195608+1.2
195609+0.1
195610+1.8
195611+0.2
195612+1.1
195701+0.6
195702-0.1
195703+0.2
195704+0.2
195705-0.7
195706+0.2
195707+0.2
195708-0.5
195709-0.9
1957100.0
195711-1.0
195712-0.3
195801-1.9
195802-0.5
195803+0.3
195804+0.4
195805-0.5
195806+0.3
195807+0.4
195808+0.9
195809-0.3
195810+0.1
195811-0.4
195812-0.6
195901-0.9
195902-1.4
195903+1.3
195904+0.4
195905+0.5
195906-0.1
195907-0.3
195908-0.1
1959090.0
195910+0.5
195911+0.9
195912+0.9
196001+0.1
196002+0.1
196003+1.0
196004+0.8
196005+0.5
196006+0.1
196007+0.5
196008+0.8
196009+0.7
196010+0.1
196011+0.5
196012+0.8
196101-0.3
196102+0.9
196103-1.8
196104+0.8
196105+0.3
196106+0.1
196107+0.2
196108+0.2
196109+0.1
196110-0.3
196111+0.5
196112+1.5
196201+2.0
196202-0.3
196203+0.1
196204+0.2
196205+1.1
196206+0.7
196207+0.1
196208+0.6
196209+0.4
196210+1.0
196211+0.3
196212+0.2
196301+1.0
196302+0.6
196303+1.1
196304+0.8
196305+0.4
196306-0.5
196307-0.1
1963080.0
196309-0.6
196310-1.2
196311-0.8
196312-1.2
196401-0.4
1964020.0
196403+1.1
196404+1.1
196405+0.2
196406+0.8
196407+0.6
196408+1.5
196409+1.3
196410+1.3
196411+0.2
196412-0.3
196501-0.4
196502+0.4
196503+0.8
196504-0.5
196505+0.2
196506-0.6
196507-1.8
196508-0.7
196509-1.3
196510-0.9
196511-1.5
196512+0.2
196601-1.3
196602-0.2
196603-0.9
196604-0.2
196605-0.4
196606+0.3
196607+0.1
196608+0.6
196609-0.2
196610-0.1
196611-0.0
196612-0.3
196701+1.7
196702+1.7
196703+1.2
196704-0.0
196705-0.0
196706+0.6
196707+0.2
196708+0.7
196709+0.5
196710+0.1
196711-0.4
196712-0.6
196801+0.5
196802+1.3
196803+0.1
1968040.0
196805+1.2
196806+1.1
196807+0.7
196808+0.3
196809-0.3
196810-0.1
196811-0.3
196812+0.2
196901-1.5
196902-0.5
196903+0.4
196904-0.4
196905-0.2
196906+0.2
196907-0.5
196908-0.1
196909-1.0
196910-0.9
196911-0.1
196912+0.4
197001-1.1
197002-1.0
197003+0.6
197004-0.1
197005+0.4
197006+1.0
197007-0.4
197008+0.6
197009+1.2
197010+1.0
197011+1.6
197012+1.9
197101+0.4
197102+2.0
197103+2.3
197104+1.7
197105+0.9
197106+0.4
197107+0.2
197108+1.5
197109+1.4
197110+1.7
197111+0.5
197112+0.3
197201+0.5
197202+1.1
197203+0.6
197204-0.1
197205-1.6
197206-0.5
197207-1.4
197208-0.5
197209-1.4
197210-0.9
197211-0.3
197212-1.3
197301-0.3
197302-1.4
197303+0.7
197304+0.1
197305+0.4
197306+1.1
197307+0.6
197308+1.3
197309+1.2
197310+0.8
197311+2.6
197312+1.8
197401+2.4
197402+2.1
197403+2.4
197404+0.9
197405+1.0
197406+0.4
197407+1.1
197408+0.8
197409+1.1
197410+0.9
197411-0.1
197412+0.2
197501-0.5
197502+0.8
197503+1.6
197504+1.2
197505+0.6
197506+1.3
197507+1.9
197508+2.0
197509+2.1
197510+1.7
197511+1.2
197512+2.1
197601+1.4
197602+1.7
197603+1.7
197604+0.3
197605+0.4
197606+0.3
197607-0.9
197608-0.8
197609-1.1
197610+0.4
197611+0.7
197612-0.3
197701-0.4
197702+1.2
197703-0.5
197704-0.4
197705-0.5
197706-0.9
197707-1.1
197708-0.8
197709-0.8
197710-1.0
197711-1.3
197712-1.1
197801-0.3
197802-2.7
197803-0.2
197804-0.3
197805+1.4
197806+0.7
197807+0.6
197808+0.4
197809+0.1
197810-0.4
197811-0.0
197812-0.1
197901-0.4
197902+1.0
197903+0.1
197904-0.1
197905+0.5
197906+0.6
197907+1.3
197908-0.2
197909+0.1
197910-0.1
197911-0.4
197912-0.7
198001+0.4
198002+0.3
198003-0.4
198004-0.6
198005-0.0
198006-0.0
198007-0.0
198008+0.4
198009-0.5
1980100.0
198011-0.3
198012-0.1
198101+0.4
198102-0.2
198103-1.3
198104-0.1
198105+0.8
198106+1.2
198107+0.8
198108+0.7
198109+0.3
198110-0.4
198111+0.2
198112+0.5
198201+1.2
198202+0.3
198203+0.6
198204+0.1
198205-0.3
198206-1.0
198207-1.5
198208-1.7
198209-1.7
198210-1.7
198211-2.6
198212-2.2
198301-3.5
198302-3.6
198303-2.4
198304-0.9
198305+0.6
1983060.0
198307-0.6
198308+0.1
198309+0.9
198310+0.4
198311-0.1
1983120.0
198401+0.2
198402+0.9
198403-0.2
198404+0.3
198405+0.2
198406-0.3
198407+0.2
198408+0.4
198409+0.1
198410-0.3
198411+0.3
198412-0.1
198501-0.3
198502+1.2
198503+0.8
198504+1.2
198505+0.4
198506-0.4
198507-0.1
198508+1.0
1985090.0
198510-0.4
198511-0.2
198512+0.2
198601+1.0
198602-1.0
198603+0.5
198604+0.3
198605-0.2
198606+1.0
198607+0.3
198608-0.4
198609-0.5
198610+0.6
198611-1.2
198612-1.4
198701-0.7
198702-1.2
198703-1.3
198704-1.4
198705-1.3
198706-1.1
198707-1.4
198708-0.9
198709-1.0
198710-0.4
198711-0.0
198712-0.5
198801-0.1
198802-0.4
198803+0.6
198804+0.1
198805+0.9
198806+0.1
198807+1.0
198808+1.5
198809+1.8
198810+1.4
198811+1.7
198812+1.2
198901+1.5
198902+1.2
198903+1.1
198904+1.6
198905+1.2
198906+0.7
198907+0.9
198908-0.3
198909+0.5
198910+0.8
198911-0.2
198912-0.5
199001-0.1
199002-1.8
199003-0.4
199004+0.2
199005+1.2
199006+0.3
199007+0.5
199008-0.2
199009-0.7
199010+0.3
199011-0.5
199012-0.2
199101+0.6
199102+0.3
199103-0.7
199104-0.6
199105-1.0
199106-0.1
1991070.0
199108-0.4
199109-1.5
199110-1.0
199111-0.7
199112-1.8
199201-2.9
199202-0.9
199203-2.0
199204-1.0
199205+0.3
199206-0.6
199207-0.6
199208+0.4
199209+0.1
199210-1.4
199211-0.7
199212-0.6
199301-0.9
199302-0.7
199303-0.5
199304-1.2
199305-0.3
199306-0.8
199307-0.8
199308-0.9
199309-0.7
199310-1.1
199311-0.1
199312+0.2
199401-0.1
199402+0.3
199403-0.7
199404-1.3
199405-0.7
199406-0.4
199407-1.3
199408-1.2
199409-1.6
199410-1.1
199411-0.6
199412-1.2
199501-0.4
199502-0.1
199503+0.8
199504-0.7
199505-0.4
199506+0.1
199507+0.4
199508+0.3
199509+0.3
1995100.0
1995110.0
199512-0.5
199601+1.0
199602+0.3
199603+1.1
199604+0.8
199605+0.3
199606+1.2
199607+0.7
199608+0.7
199609+0.6
199610+0.6
199611-0.1
199612+0.9
199701+0.5
199702+1.7
199703-0.4
199704-0.6
199705-1.3
199706-1.4
199707-0.8
199708-1.4
199709-1.4
199710-1.5
199711-1.2
199712-1.0
199801-2.7
199802-2.0
199803-2.4
199804-1.4
199805+0.3
199806+1.0
199807+1.2
199808+1.2
199809+1.0
199810+1.1
199811+1.0
199812+1.4
199901+1.8
199902+1.0
199903+1.3
199904+1.4
199905+0.2
199906+0.3
199907+0.5
199908+0.4
199909-0.1
199910+1.0
199911+1.0
199912+1.4
200001+0.7
200002+1.7
200003+1.3
200004+1.2
200005+0.4
200006-0.2
200007-0.2
200008+0.7
200009+0.9
200010+1.1
200011+1.8
200012+0.8
200101+1.0
200102+1.7
200103+0.9
200104+0.2
200105-0.5
200106+0.3
200107-0.2
200108-0.4
200109+0.2
200110-0.0
200111+0.7
200112-0.8
200201+0.4
200202+1.1
200203-0.2
200204-0.1
200205-0.8
200206-0.2
200207-0.5
200208-1.0
200209-0.6
200210-0.4
200211-0.5
200212-1.1
200301-0.2
200302-0.7
200303-0.3
200304-0.1
200305-0.3
200306-0.6
200307+0.3
200308+0.1
200309-0.1
2003100.0
200311-0.3
200312+1.1
200401-1.3
200402+1.2
200403+0.4
200404-0.9
200405+1.0
200406-0.8
200407-0.5
200408-0.3
200409-0.3
200410-0.1
200411-0.7
200412-0.8
200501+0.3
200502-3.1
200503+0.3
200504-0.6
200505-0.8
200506+0.4
200507+0.2
200508-0.3
200509+0.4
200510+1.2
200511-0.2
200512-0.0
200601+1.7
200602+0.1
200603+1.8
200604+1.1
200605-0.5
200606-0.2
200607-0.6
200608-1.0
200609-0.6
200610-1.3
200611+0.1
200612-0.3
200701-0.8
200702-0.1
200703+0.2
200704-0.1
200705-0.1
200706+0.5
200707-0.3
200708+0.4
200709+0.2
200710+0.7
200711+0.9
200712+1.7
200801+1.8
200802+2.6
200803+1.4
200804+0.7
200805-0.1
200806+0.6
200807+0.3
200808+1.0
200809+1.2
200810+1.3
200811+1.3
200812+1.4
200901+1.1
200902+1.9
200903+0.4
200904+0.8
200905-0.1
200906+0.1
200907+0.2
200908-0.2
200909+0.3
200910-1.2
200911-0.6
200912-0.7
201001-1.1
201002-1.5
201003-0.7
201004+1.2
201005+0.9
201006+0.4
201007+1.8
201008+1.8
201009+2.2
201010+1.7
201011+1.3
201012+2.9
201101+2.3
201102+2.7
201103+2.5
201104+1.9
201105+0.4
201106+0.2
201107+1.0
201108+0.4
201109+1.0
201110+0.8
201111+1.1
201112+2.5
201201+1.1
201202+0.5
201203+0.7
201204-0.3
2012050.0
201206-0.4
201207-0.0
201208-0.2
201209+0.2
201210+0.3
201211+0.3
201212-0.6
201301-0.1
201302-0.2
201303+1.5
201304+0.2
201305+0.8
201306+1.2
201307+0.8
201308+0.2
201309+0.3
201310-0.1
201311+0.7
201312+0.1
201401+1.4
201402+0.1
201403-0.9
201404+0.8
201405+0.5
201406+0.2
201407-0.2
201408-0.7
201409-0.7
201410-0.6
201411-0.9
201412-0.6
201501-0.8
201502+0.2
201503-0.7
201504-0.0
201505-0.7
201506-0.6
201507-1.1
201508-1.4
201509-1.6
201510-1.7
201511-0.5
201512-0.6
201601-2.2
201602-2.0
201603-0.1
201604-1.2
201605+0.4
201606+0.6
201607+0.4
201608+0.7
201609+1.2
201610-0.3
201611-0.1
201612+0.3
201701+0.2
201702-0.1
201703+0.9
201704-0.2
201705+0.3
201706-0.4
201707+0.8
201708+0.5
201709+0.6
201710+0.9
201711+0.9
201712-0.1
201801+1.1
201802-0.5
201803+1.5
201804+0.5
201805+0.4
201806-0.1
201807+0.2
201808-0.3
201809-0.9
201810+0.4
201811-0.1
201812+1.0
201901-0.0
201902-1.4
201903-0.3
201904+0.1
201905-0.4
201906-0.5
201907-0.4
201908-0.1
201909-1.2
201910-0.4
201911-0.8
201912-0.6
202001+0.2
202002-0.1
202003-0.1
202004+0.2
202005+0.4
202006-0.4
202007+0.4
202008+1.1
202009+0.9
202010+0.5
202011+0.7
202012+1.8
202101+1.9
202102+1.5
202103+0.4
202104+0.3
202105+0.5

Calculation of SOI

cảnh báo the anomalies are departures from the 1981-2010 base period.