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Intertropical Convergence Zone

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570: 419: 584: 45: 227: 287: 381:, to find oneself becalmed in this region in a hot and muggy climate could mean death when wind was the only effective way to propel ships across the ocean. Calm periods within the doldrums could strand ships for days or weeks. Even today, leisure and competitive sailors attempt to cross the zone as quickly as possible as the erratic weather and wind patterns may cause unexpected delays. 327: 218:
can be decoupled over the continents. The equatorial precipitation over land is not simply a response to just the surface convergence. Rather, it is modulated by a number of regional features such as local atmospheric jets and waves, proximity to the oceans, terrain-induced convective systems, moisture recycling, and spatiotemporal variability of land cover and albedo.
206: 400:. The aircraft crashed with no survivors while flying through a series of large ITCZ thunderstorms, and ice forming rapidly on airspeed sensors was the precipitating cause for a cascade of human errors which ultimately doomed the flight. Most aircraft flying these routes are able to avoid the larger 294:
Variation in the location of the intertropical convergence zone drastically affects rainfall in many equatorial nations, resulting in the wet and dry seasons of the tropics rather than the cold and warm seasons of higher latitudes. Longer term changes in the intertropical convergence zone can result
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is better defined, the seasonal cycle is more subtle, as the convection is constrained by the distribution of ocean temperatures. Sometimes, a double ITCZ forms, with one located north and another south of the Equator, one of which is usually stronger than the other. When this occurs, a narrow ridge
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The ITCZ is commonly defined as an equatorial zone where the trade winds converge. Rainfall seasonality is traditionally attributed to the north–south migration of the ITCZ, which follows the sun. Although this is largely valid over the equatorial oceans, the ITCZ and the region of maximum rainfall
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may become stronger and more concentrated at the center of the ITCZ in response to a globally warming climate, resulting in sharpened contrasts in precipitation between the ITCZ core (where precipitation would be amplified) and its edges (where precipitation would be suppressed).
524:(CMIP6) have shown greater agreement over some regional shifts of the ITCZ in response to anthropogenic climate change, including a northward displacement over the Indian Ocean and eastern Africa and a southward displacement over the eastern Pacific and Atlantic oceans. 454:
during the late-Holocene towards its current position. The ITCZ has also undergone periods of contraction and expansion within the last millennium. A southward shift of the ITCZ commencing after the 1950s and continuing into the 1980s may have been associated with
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The location of the ITCZ gradually varies with the seasons, roughly corresponding with the location of the thermal equator. As the heat capacity of the oceans is greater than air over land, migration is more prominent over land. Over the oceans, where the
520:(CMIP5) did not show a consistent global displacement of the ITCZ under anthropogenic climate change. In contrast, most of the same simulations show narrowing and intensification under the same prescribed conditions. However, simulations in 503:
Less certain are the regional and global shifts in ITCZ position as a result of climate change, with paleoclimate data and model simulations highlighting contrasts stemming from asymmetries in forcing from aerosols, voclanic activity, and
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suggest that the ITCZ over the Pacific has narrowed and intensified since at least 1979, in agreement with data collected by satellites and in-situ precipitation measurements. The drier ITCZ fringes are also associated with an increase in
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within the last 100 ka, a southward shift of the ITCZ coincided with the intensification of the Northern Hemisphere Hadley cell coincident with weakening of the Southern Hemisphere Hadley cell. The ITCZ shifted north during the
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Within the ITCZ the average winds are slight, unlike the zones north and south of the equator where the trade winds feed. As trans-equator sea voyages became more common, sailors in the eighteenth century named this belt of calm
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in the gradient in temperature between the Northern and Southern hemispheres. These fluctuations in ITCZ positioning had robust effects on climate; for instance, displacement of the ITCZ may have led to
176:. For instance, when the ITCZ is situated north of the Equator, the southeast trade wind changes to a southwest wind as it crosses the Equator. The ITCZ is formed by vertical motion largely appearing as 496:. This change in the ITCZ is also reflected by increasing salinity within the Atlantic and Pacific underlying the ITCZ fringes and decreasing salinity underlying central belt of the ITCZ. The 365:
within this zone more possible. Surges of higher pressure from high latitudes can enhance tropical disturbances along its axis. In the north Atlantic and the northeastern Pacific oceans,
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along the leading edge of the equatorial air. There appears to be a 15 to 25-day cycle in thunderstorm activity along the ITCZ, which is roughly half the wavelength of the
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activity of thunderstorms driven by solar heating, which effectively draw air in; these are the trade winds. The ITCZ is effectively a tracer of the ascending branch of the
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Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change
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Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change
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Climate Change 2021: The Physical Science Basis. Contribution of Working Group I to the Sixth Assessment Report of the Intergovernmental Panel on Climate Change
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Seasonal variability of the Intertropical Convergence Zone (ITCZ), Congo air boundary (CAB), tropical rainbelt, and surface winds over Africa (adapted from
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move along the axis of the ITCZ causing an increase in thunderstorm activity, and clusters of thunderstorms can develop under weak vertical wind shear.
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Eyring, Veronika; Gillett, Nathan P.; et al. (2021). "Human Influence on the Climate System". In Masson-Delmotte, Valerie; Zhai, Panmao (eds.).
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The ITCZ moves farther away from the equator during the Northern summer than the Southern one due to the North-heavy arrangement of the continents.
242:(SPCZ) is a reverse-oriented, or west-northwest to east-southeast aligned, trough extending from the west Pacific warm pool southeastwards towards 168:, they move northwestward from the southeast. When the ITCZ is positioned north or south of the Equator, these directions change according to the 246:. It lies just south of the equator during the Southern Hemisphere warm season, but can be more extratropical in nature, especially east of the 210: 706: 521: 517: 1041: 258:. The southern ITCZ in the southeast Pacific and southern Atlantic, known as the SITCZ, occurs during the Southern Hemisphere fall between 357:. As the ITCZ migrates to tropical and subtropical latitudes and even beyond during the respective hemisphere's summer season, increasing 271: 1107:; Peterson, Larry C.; Röhl, Ursula (17 August 2001). "Southward Migration of the Intertropical Convergence Zone Through the Holocene". 500:
indicated "medium agreement" from studies regarding the strengthening and tightening of the ITCZ due to anthropogenic climate change.
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Northeasterly Cold Surges and Near-Equatorial Disturbances over the Winter MONEX Area during December 1974. Part I: Synoptic Aspects.
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as one of its six requirements, and the ITCZ fills this role as it is a zone of wind change and speed, otherwise known as horizontal
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In some cases, the ITCZ may become narrow, especially when it moves away from the equator; the ITCZ can then be interpreted as a
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with modification). This schematic shows that the ITCZ and the region of maximum rainfall can be decoupled over the continents.
1324: 250:. It is considered the largest and most important piece of the ITCZ, and has the least dependence upon heating from a nearby 239: 307: 1334: 1329: 1319: 1277: 1166: 497: 489: 278:
due to upwelling off the South American continent disappears, which causes this convergence zone to vanish as well.
1243: 1242:; et al. (2021). "Human Influence on the Climate System". In Masson-Delmotte, Valerie; Zhai, Panmao (eds.). 1206: 1178: 393: 38: 1081: 542:(1798) and also provide a metaphor for the initial state of boredom and indifference of Milo, the child hero of 1037: 646: 156:
The ITCZ appears as a band of clouds, usually thunderstorms, that encircle the globe near the Equator. In the
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Vertical air velocity at 500 hPa, July average. Ascent (negative values) is concentrated close to the
1120: 884: 837: 554: 434: 274:(ENSO) patterns. When ENSO reaches its warm phase, otherwise known as El Niño, the tongue of lowered 1287: 583: 505: 267: 263: 173: 165: 157: 44: 1144: 1034: 989: 957: 908: 259: 828:
Nicholson, Sharon E. (February 2018). "The ITCZ and the Seasonal Cycle over Equatorial Africa".
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NOAA. National Ocean Atmospheric Administration's National Weather Service website, 01/07/20.
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because of its monotonous windless weather, is the area where the northeast and the southeast
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In 2009, thunderstorms along the Intertropical Convergence Zone played a role in the loss of
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Gonzalez, Alex O.; Ganguly, Indrani; McGraw, Marie C.; Larson, James G. (2022-02-15).
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though its specific position varies seasonally. When it lies near the geographic
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outward of those areas, particularly over land within the mid-latitudes and the
437:, the position and intensity of the ITCZ varied in prehistoric times along with 378: 286: 181: 161: 96: 326: 137:), but after the recognition in the 1940s and the 1950s of the significance of 565: 493: 451: 354: 177: 953: 944: 927: 926:
Ganguly, Indrani; Gonzalez, Alex O.; Karnauskas, Kristopher B. (2023-10-20).
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The ITCZ is visible as a band of clouds encircling Earth near the Equator.
1214:. Cambridge, United Kingdom: Cambridge University Press. pp. 423–551 1186:. Cambridge, United Kingdom: Cambridge University Press. pp. 287–422 642: 447: 422: 205: 675:. Vol. 8 (11th ed.). Cambridge University Press. p. 386. 509: 460: 296: 142: 112: 104: 129:
The ITCZ was originally identified from the 1920s to the 1940s as the
763:"Inter Tropical Convergence Zone (ITCZ) - SKYbrary Aviation Safety" 429:
have been used as a paleoclimate proxy to infer shifts in the ITCZ.
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move in a southwestward direction from the northeast, while in the
417: 397: 325: 285: 225: 204: 1169:; et al. (2021). "Changing State of the Climate System". In 873:"Rapid Dynamical Evolution of ITCZ Events over the East Pacific" 741: 664: 121:(a usage that is more common in Australia and parts of Asia). 68: 197:
of high pressure forms between the two convergence zones.
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Duane E. Waliser and Catherine Gautier, November 1993:
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Tropical Cyclone Formation/Structure/Motion Studies.
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American Association for the Advancement of Science
467:; a northward rebound began subsequently following 793:"Climate of Western and Central Equatorial Africa" 694: 318:because of the calm, stagnant, or inactive winds. 988:Semyon A. Grodsky; James A. Carton (2003-02-15). 463:in the Northern Hemisphere based on results from 111:. Where the ITCZ is drawn into and merges with a 254:during the summer than any other portion of the 30:"The Calms" redirects here. For other uses, see 830:Bulletin of the American Meteorological Society 797:Oxford Research Encyclopedia of Climate Science 598:Asymmetry of the Intertropical Convergence Zone 37:"Doldrums" redirects here. For other uses, see 976:Movement of the South Pacific convergence zone 115:circulation, it is sometimes referred to as a 1296:"A Satellite-derived Climatology of the ITCZ" 522:Coupled Model Intercomparison Project Phase 6 518:Coupled Model Intercomparison Project Phase 5 342:in the Intertropical Convergence Zone. (2010) 184:and is wet. The dry descending branch is the 8: 414:Effects of climate change on the water cycle 338:in the eastern Pacific and the precursor to 514:Atlantic meridional overturning circulation 390:Rio de Janeiro–Galeão International Airport 234:; descent (positive values) is more diffuse 1233: 1231: 1229: 1056:C.-P. Chang, J.E. Erickson, and K.M. Lau. 943: 516:. The climate simulations run as part of 450:but migrated south following changes in 43: 634: 995:. University of Maryland, College Park 805:10.1093/acrefore/9780190228620.013.511 532:The doldrums are notably described in 425:concentrations in sediment within the 99:converge. It encircles Earth near the 1238:Douville, Hervé; Raghavan, Krishnan; 738:JetStream - Online School for Weather 7: 786: 784: 782: 552:. It is also cited in the 1939 book 388:, which crashed while flying from 322:Role in tropical cyclone formation 25: 734:"Inter-Tropical Convergence Zone" 721:Atmosphere, weather, and climate. 546:'s classic 1961 children's novel 270:longitude during cool or neutral 697:Atmosphere, weather, and climate 582: 568: 61: 539:The Rime of the Ancient Mariner 18:Inter-Tropical Convergence Zone 240:South Pacific convergence zone 222:South Pacific convergence zone 147:Intertropical Convergence Zone 54:Intertropical Convergence Zone 1: 299:or flooding in nearby areas. 145:weather production, the term 1278:University of South Carolina 791:Dezfuli, Amin (2017-03-29). 498:IPCC Sixth Assessment Report 272:El Niño–Southern Oscillation 490:outgoing longwave radiation 266:of the equator east of the 87:), known by sailors as the 1351: 1044:November 29, 2007, at the 974:E. Linacre and B. Geerts. 411: 36: 29: 1283:"A Shifting Band of Rain" 1040:Retrieved on 2006-11-26. 439:changes in global climate 408:Effects of climate change 394:Charles de Gaulle Airport 308:Madden–Julian oscillation 201:ITCZ over oceans vs. land 39:Doldrums (disambiguation) 27:Meteorological phenomenon 1171:Masson-Delmotte, Valerie 1070:"What are the doldrums?" 1060:Retrieved on 2007-04-26. 1038:Office of Naval Research 978:Retrieved on 2006-11-26. 945:10.1175/JCLI-D-22-0849.1 897:10.1175/JCLI-D-21-0216.1 850:10.1175/bams-d-16-0287.1 647:National Weather Service 404:cells without incident. 276:sea surface temperatures 1133:10.1126/science.1059725 1082:"Q & A Turbulences" 1016:. Prentice Hall, 1994. 672:Encyclopædia Britannica 534:Samuel Taylor Coleridge 361:makes the formation of 349:depends upon low-level 248:International Date Line 1177:; et al. (eds.). 485:Atmospheric reanalyses 480:Atmospheric convection 430: 343: 291: 235: 214: 139:wind field convergence 109:near-equatorial trough 49: 1325:Geography terminology 1103:; Hughen, Konrad A.; 701:. London: Routledge. 576:Earth sciences portal 549:The Phantom Tollbooth 421: 386:Air France Flight 447 347:Tropical cyclogenesis 329: 289: 229: 208: 47: 32:Calm (disambiguation) 1335:Tropical meteorology 1330:Nautical terminology 1320:Atmospheric dynamics 555:Wind, Sand and Stars 474:drought in the Sahel 435:paleoclimate proxies 153:) was then applied. 1288:Scientific American 1125:2001Sci...293.1304H 889:2022JCli...35.1197G 842:2018BAMS...99..337N 691:Chorley, Richard J. 687:Barry, Roger Graham 268:140th meridian west 166:Southern Hemisphere 158:Northern Hemisphere 131:Intertropical Front 107:, it is called the 1274:The ITCZ in Africa 932:Journal of Climate 877:Journal of Climate 506:orbital variations 431: 344: 292: 282:Effects on weather 236: 215: 50: 1105:Sigman, Daniel M. 1033:Patrick A. Harr. 767:www.skybrary.aero 708:978-0-415-07760-6 363:tropical cyclones 16:(Redirected from 1342: 1261: 1260: 1258: 1256: 1250: 1235: 1224: 1223: 1221: 1219: 1213: 1202: 1196: 1195: 1193: 1191: 1185: 1167:Thorne, Peter W. 1163:Gulev, Sergey K. 1159: 1153: 1152: 1097: 1091: 1079: 1073: 1067: 1061: 1054: 1048: 1031: 1025: 1014:Weather Analysis 1010: 1004: 1003: 1001: 1000: 994: 985: 979: 972: 966: 965: 947: 938:(aop): 129–143. 923: 917: 916: 883:(4): 1197–1213. 868: 862: 861: 825: 819: 818: 788: 777: 776: 774: 773: 759: 753: 752: 750: 749: 730: 724: 723: 700: 683: 677: 676: 668: 666:"Doldrums"  657: 651: 650: 639: 603:Chemical equator 592: 587: 586: 578: 573: 572: 571: 244:French Polynesia 194:convergence zone 174:Earth's rotation 80: 75: 74: 71: 70: 67: 21: 1350: 1349: 1345: 1344: 1343: 1341: 1340: 1339: 1310: 1309: 1270: 1265: 1264: 1254: 1252: 1248: 1237: 1236: 1227: 1217: 1215: 1211: 1204: 1203: 1199: 1189: 1187: 1183: 1161: 1160: 1156: 1101:Haug, Gerald H. 1099: 1098: 1094: 1080: 1076: 1068: 1064: 1055: 1051: 1046:Wayback Machine 1032: 1028: 1011: 1007: 998: 996: 992: 987: 986: 982: 973: 969: 925: 924: 920: 870: 869: 865: 827: 826: 822: 815: 790: 789: 780: 771: 769: 761: 760: 756: 747: 745: 732: 731: 727: 709: 685: 684: 680: 659: 658: 654: 641: 640: 636: 631: 623:Roaring Forties 613:Horse latitudes 588: 581: 574: 569: 567: 564: 530: 457:cooling induced 443:Heinrich events 416: 410: 375: 324: 284: 224: 203: 186:horse latitudes 170:Coriolis effect 127: 101:thermal equator 78: 64: 60: 42: 35: 28: 23: 22: 15: 12: 11: 5: 1348: 1346: 1338: 1337: 1332: 1327: 1322: 1312: 1311: 1308: 1307: 1292: 1280: 1269: 1268:External links 1266: 1263: 1262: 1240:Renwick, James 1225: 1197: 1154: 1092: 1090:(1 June 2009). 1074: 1062: 1049: 1026: 1005: 980: 967: 918: 863: 836:(2): 337–348. 820: 813: 778: 754: 725: 707: 678: 663:, ed. (1911). 661:Chisholm, Hugh 652: 633: 632: 630: 627: 626: 625: 620: 615: 610: 608:Monsoon trough 605: 600: 594: 593: 590:Weather portal 579: 563: 560: 529: 526: 476:in the 1980s. 469:forced changes 465:climate models 409: 406: 374: 371: 367:tropical waves 359:Coriolis force 340:Hurricane Alex 323: 320: 283: 280: 256:monsoon trough 223: 220: 202: 199: 126: 123: 118:monsoon trough 26: 24: 14: 13: 10: 9: 6: 4: 3: 2: 1347: 1336: 1333: 1331: 1328: 1326: 1323: 1321: 1318: 1317: 1315: 1305: 1301: 1297: 1293: 1290: 1289: 1284: 1281: 1279: 1275: 1272: 1271: 1267: 1247: 1246: 1241: 1234: 1232: 1230: 1226: 1210: 1209: 1201: 1198: 1182: 1181: 1176: 1172: 1168: 1164: 1158: 1155: 1150: 1146: 1142: 1138: 1134: 1130: 1126: 1122: 1119:: 1304–1308. 1118: 1114: 1110: 1106: 1102: 1096: 1093: 1089: 1088: 1083: 1078: 1075: 1071: 1066: 1063: 1059: 1053: 1050: 1047: 1043: 1039: 1036: 1030: 1027: 1023: 1022:0-13-501149-3 1019: 1015: 1009: 1006: 991: 984: 981: 977: 971: 968: 963: 959: 955: 951: 946: 941: 937: 933: 929: 922: 919: 914: 910: 906: 902: 898: 894: 890: 886: 882: 878: 874: 867: 864: 859: 855: 851: 847: 843: 839: 835: 831: 824: 821: 816: 814:9780190228620 810: 806: 802: 798: 794: 787: 785: 783: 779: 768: 764: 758: 755: 743: 739: 735: 729: 726: 722: 718: 714: 710: 704: 699: 698: 692: 688: 682: 679: 674: 673: 667: 662: 656: 653: 648: 644: 638: 635: 628: 624: 621: 619: 616: 614: 611: 609: 606: 604: 601: 599: 596: 595: 591: 585: 580: 577: 566: 561: 559: 557: 556: 551: 550: 545: 544:Norton Juster 541: 540: 535: 528:In literature 527: 525: 523: 519: 515: 511: 507: 501: 499: 495: 491: 486: 481: 477: 475: 470: 466: 462: 458: 453: 449: 444: 440: 436: 428: 427:Cariaco Basin 424: 420: 415: 407: 405: 403: 399: 395: 391: 387: 382: 380: 372: 370: 368: 364: 360: 356: 352: 348: 341: 337: 333: 328: 321: 319: 317: 311: 309: 305: 300: 298: 288: 281: 279: 277: 273: 269: 265: 261: 257: 253: 249: 245: 241: 233: 232:solar equator 228: 221: 219: 212: 207: 200: 198: 195: 189: 187: 183: 179: 175: 171: 167: 163: 159: 154: 152: 148: 144: 140: 136: 132: 124: 122: 120: 119: 114: 110: 106: 102: 98: 94: 90: 86: 82: 81: 73: 59: 55: 46: 40: 33: 19: 1306:, 2162–2174. 1303: 1299: 1291:(March 2011) 1286: 1253:. 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During 433:Based on 351:vorticity 264:10° south 252:land mass 113:monsoonal 1276:via the 1149:24591761 1141:11509727 1115:(5533). 1042:Archived 693:(1992). 562:See also 536:'s poem 512:and the 510:monsoons 461:aerosols 423:Titanium 297:droughts 143:tropical 89:doldrums 1121:Bibcode 1109:Science 885:Bibcode 838:Bibcode 377:In the 373:Hazards 310:(MJO). 105:Equator 91:or the 1147:  1139:  1020:  960:  952:  911:  903:  856:  811:  715:  705:  643:"ITCZ" 160:, the 1249:(PDF) 1212:(PDF) 1184:(PDF) 1145:S2CID 993:(PDF) 958:S2CID 909:S2CID 398:Paris 396:near 336:Darby 332:Celia 304:front 93:calms 83:, or 1257:2023 1220:2023 1192:2023 1137:PMID 1018:ISBN 950:ISSN 901:ISSN 854:ISSN 809:ISBN 742:NOAA 713:OCLC 703:ISBN 334:and 262:and 238:The 151:ITCZ 79:ITCH 58:ITCZ 52:The 1129:doi 1113:293 940:doi 893:doi 846:doi 801:doi 459:by 392:to 141:in 135:ITF 85:ICZ 1316:: 1302:, 1298:. 1285:, 1228:^ 1173:; 1165:; 1143:. 1135:. 1127:. 1111:. 1084:. 956:. 948:. 936:-1 934:. 930:. 907:. 899:. 891:. 881:35 879:. 875:. 852:. 844:. 834:99 832:. 807:. 799:. 795:. 781:^ 765:. 740:. 736:. 719:. 711:. 689:; 669:. 645:. 558:. 260:3° 188:. 69:tʃ 1304:6 1259:. 1222:. 1194:. 1151:. 1131:: 1123:: 1024:. 1002:. 964:. 942:: 915:. 895:: 887:: 860:. 848:: 840:: 817:. 803:: 775:. 751:. 649:. 149:( 133:( 72:/ 66:ɪ 63:/ 56:( 41:. 34:. 20:)

Index

Inter-Tropical Convergence Zone
Calm (disambiguation)
Doldrums (disambiguation)

/ɪ/
ITCH
trade winds
thermal equator
Equator
monsoonal
monsoon trough
wind field convergence
tropical
Northern Hemisphere
trade winds
Southern Hemisphere
Coriolis effect
Earth's rotation
convective
Hadley cell
horse latitudes
convergence zone

Dezfuli 2017

solar equator
South Pacific convergence zone
French Polynesia
International Date Line
land mass

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