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Brownie Lake

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509: 501:(the maximum distance the wind can travel across the water). When the wind no longer mixed oxygenated surface water with the bottom waters of Brown Lake, sedimentary iron became soluble and was mobilized into the anoxic bottom water at a concentration several hundred times greater than the surface water, increasing the relative density of the bottom water and beginning a positive feedback system in which other ions such as sodium and chloride could also accumulate, further minimizing the probability that wind energy would be sufficient to mix surface water into the increasingly dense bottom water. The onset of 355: 45: 29: 52: 477:
The land surrounding Brownie Lake was purchased by William McNair shortly after the land west of the Mississippi River was opened for white settlement in 1857. McNair named the lake "Brownie", after a nickname of his daughter, Agnes McNair. It was formerly called "Hillside Harbor". Brownie Lake was
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In the winter, the Chain of Lakes Ski Trail extends for 1 km from the tunnel to Cedar Lake, across the lake and up the western side of the basin, connecting up with the Theodore Wirth Park trails. Trails are maintained through a partnership of the Minneapolis Park and Recreation Board and the
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In 1867 the St. Paul & Pacific Railroad Company built a railroad track across the southern end of Brownie Lake. In 1883 James J. Hill took over the St. Paul & Pacific Railroad and expanded the track into a double track mainline that connected the wheat fields west of the Mississippi to the
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Within Brownie Lake Park, a 1.4-mile single track mountain biking trail loops along the western slope of the Brownie Lake basin. This trail connects to the Glenwood Loop and the Southwest Wirth loop, and all trails are maintained by Minnesota Off-Road Cyclists. This was the first "Black Diamond"
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Phytoplankton predominate over zooplankton in Brownie Lake. In recent monitoring (2012), Cryptomonads (Cryptophyta) were most abundant in winter. Chrysophyte populations peaked in April, while Dinoflagellates (Pyrrhophyta) and green algae (Chlorophyta) both peaked in June. The summer was then
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Open water plants in Brownie Lake include yellow and white water lilies, coontail, pondweeds, and lesser duckweed. The aquatic invasive species Eurasian watermilfoil and curly-leaf pondweed are also present. The surrounding area is composed of altered forest/woodland, prairie, and dry-mesic
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A distinguishing feature of Brownie Lake is the high concentrations of dissolved iron (Fe), which have historically been between 1–2 mmol/L in the bottom part of the lake, and still exceed 1 mmol/L today. From 1950 until the 1990s, an industrial cooling outlet from what was the
493:(1913), and Cedar Lake and Brownie Lake (1916). The hydraulic connections reduced the lake level of Brownie Lake by 2 to 3 meters, which drew Brownie Lake down into its steep-sided local catchment, significantly reducing its surface area, and increasing shelter from wind.  993:
Myrbo, Amy; Murphy, Marylee; Stanley, Valerie (2011). "The Minneapolis Chain of Lakes by bicycle: Glacial history, human modifications, and paleolimnology of an urban natural environment". In Miller, James D.; Hudak, George J.; Wittkop, Chad; McLaughlin, Patrick I. (eds.).
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was pumped into Bassett Creek, which then entered Brownie. Concerns about elevated phosphate from the rivers being transferred into the Minneapolis city lakes resulted in the dismantling of the program in the 1990s. Brownie receives stormwater inputs from Minneapolis and
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Office Building with average total iron concentrations of 7 ÎĽmol/L was discharged into Brownie Lake at a rate of 50,000 gallons per day. Therefore, surface concentrations of dissolved iron were higher in the 1970s (~ 2 ÎĽmol/L) than they are today (< 1 ÎĽmol/L).
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Lambrecht, Nicholas; Katsev, Sergei; Wittkop, Chad; Hall, Steven J.; Sheik, Cody S.; Picard, Aude; Fakhraee, Mojtaba; Swanner, Elizabeth D. (January 2020). "Biogeochemical and physical controls on methane fluxes from two ferruginous meromictic lakes".
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between 16,500 and 13,900 cal yr BP. These deposits include a mixture of sediments derived from both northwest- and northeast-sourced glacial ice, with northeast-sourced sediments containing a greater abundance of iron-rich rocks from the
343:, which were filled with sediments during the Last Glacial Maximum. These buried valleys have little surface expression, but are associated with clusters of lakes, and locally influenced the course of modern rivers and streams. 220:. There are no natural inflows to Brownie Lake, but it receives storm sewer runoff from six locations around the lake. Water flows out through a canal connecting Brownie to Cedar Lake, which is hydrologically connected to 555:
Motor boats are not permitted on Brownie Lake. A canoe/kayak rack is stationed near the dirt boat ramp at the northwest end of the lake, and rack spaces can be rented from the Minneapolis Park and Recreation Board.
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Chlorobium masyuteum". This organism is photosynthetic, and uses sunlight energy to convert dissolved iron into rust. The epithet "masyuteum" was derived from the Dakota phrase mas’yúte, meaning “eats iron”.
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It is most likely that Brownie Lake became meromictic as a result of the significant decrease in the ability of wind to impart energy to the surface of the lake, both due to sheltering and reduced maximum
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Brownie Lake lies on the edge of a buried bedrock valley filled with as much as 300 feet of glacial debris. The buried valleys in the Twin Cities region likely represent river incision from previous
1219: 208:, which means there are two layers of water in the lake with differing physical and chemical conditions, and which do not intermix in spring and fall as occurs in most lakes in the northern 486:
flour mills of Minneapolis. The expansion of the railroad embankment in 1883 filled in the southwestern arm of Brownie Lake, and reduced the surface area of Brownie Lake by 34%.
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Tracey, B.; Lee, N.; Card, V. (1996). "Sediment indicators of meromixis: comparison of laminations, diatoms, and sediment chemistry in Brownie Lake, Minneapolis, USA".
256:, which then sink and dissolve, releasing phosphate. Some of the phosphate inputs are likely anthropogenic. A pumping station was created in 1957 to pump water from 1283: 300:
lakes, including Brownie Lake. While lake lowering initiated the onset of meromixis (see History), road salt pollution stabilizes the lake against intermixing.
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diffusing out of the anoxic portion of the lake by reaction with oxygen. A new species of bacteria was discovered from Brownie Lake in 2021 and named
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Total phosphate concentrations in Brownie Lake can reach 46 ÎĽmol/L. In 2014, Brownie had total phosphorus levels considered eutrophic by the
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ions in the surface and bottom waters from the 1970s to 2010s was caused by the use of road salt in de-icing. Sodium and chloride are
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The lake's surface area was further decreased by 56% between 1913 and 1917 after channels were constructed to connect Cedar Lake and
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The uplands immediately surrounding Brownie Lake are composed of a mixture of sands, gravels, and glacial tills deposited during the
1107:""Candidatus Chlorobium masyuteum," a Novel Photoferrotrophic Green Sulfur Bacterium Enriched From a Ferruginous Meromictic Lake" 1105:
Lambrecht, Nicholas; Stevenson, Zackry; Sheik, Cody S.; Pronschinske, Matthew A.; Tong, Hui; Swanner, Elizabeth D. (2021).
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Novotny, Eric V.; Murphy, Dan; Stefan, Heinz G. (November 2008). "Increase of urban lake salinity by road deicing salt".
544:, runs north-south along Cedar Lake Parkway, just to the east and elevated above Brownie Lake. This path is part of the 521: 173: 1291: 297: 1322: 165: 1363: 612: 266: 248:. Because it is meromictic with abundant dissolved iron, phosphate can be shuttled out of surface waters through 260:
into Brownie Lake in order to maintain the desired water levels in the Chain of Lakes. In 1966, water from the
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Lambrecht, Nicholas; Wittkop, Chad; Katsev, Sergei; Fakhraee, Mojtaba; Swanner, Elizabeth D. (October 2018).
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dominated by cyanobacteria (Cyanophyta), with an increase in Cryptomonad (Cryptophyta) abundance by October.
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separates the top layer of the lake, which contains dissolved oxygen, from the bottom layer, which is
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The land west of Brownie Lake, which had been a part of Theodore Wirth Park, was sold in 1952 to the
328: 324: 237: 998:. GSA Field Guides. Vol. 24. Boulder, CO: The Geological Society of America. pp. 425–437. 754: 732:
The paucity of blue-green algae in meromictic Brownie Lake: iron limitation or heavy-metal toxicity
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Brownie Lake is encircled by a packed dirt walking path. An additional paved multi-use path, the
529: 525: 288:(NaCl). Minnesota began using salt to de-ice roads in 1950. Past stormwater inputs from nearby 1189: 1146: 1128: 1087: 1079: 1007: 975: 823: 815: 691: 498: 490: 399: 261: 221: 181: 1039: 212:. It is one of two meromictic bodies of water in Minneapolis, the other being Spring Lake. A 1181: 1136: 1118: 1071: 999: 807: 681: 662:"Geochemical Characterization of Two Ferruginous Meromictic Lakes in the Upper Midwest, USA" 541: 33:
The view looking south over Brownie Lake, with Cedar Lake in the background in October 2019
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Archean to Anthropocene: Field Guides to the Geology of the Mid-Continent of North America
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The geology of Minneapolis in the vicinity of Brownie Lake generally consists of lower
289: 209: 944:(Map). County Atlas. Hennepin County: Minnesota Geological Survey. § C-45, Part A 916:(Map). County Atlas. Hennepin County: Minnesota Geological Survey. § C-45, Part A 888:(Map). County Atlas. Hennepin County: Minnesota Geological Survey. § C-45, Part A 857:(Map). County Atlas. Hennepin County: Minnesota Geological Survey. § C-45, Part A 346:
A bicycle guide to the Geology of the Chain of Lakes includes a stop at Brownie Lake.
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were likely a direct source of salt. Road salt has been linked to enhanced chemical
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Minneapolis Park & Recreation Board Environmental Stewardship (February 2017).
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relocated employees from this site in 2015, and put the property on the market.
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Loppet Foundation. Trail passes are available from the Loppet Foundation.
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City of Minneapolis GIS Water Quality Model, 2019. Barr Engineering.
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alluvium and wetland sediments are also found adjacent to the lake.
1257:(Map). Minneapolis Park and Recreation Board. 2006. Archived from 507: 353: 974:. Saint Paul, MN: Minnesota Geological Survey. pp. 515–547. 192:). It is within Brownie Lake Park, and administered by the 478:
then acquired by the expansion of the Glenwood Park, now
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reports a number of fish taxa in Brownie Lake including
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carbonates and clastic rocks overlain by unconsolidated
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Theodore Wirth Park & Chain of Lakes Ski Trail Map
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in the anoxic bottom waters, which produce methane (CH
151: 143: 135: 131: 123: 84: 69: 21: 284:throughout the lake, signifying a source from the 172:. It is the northernmost lake in the Minneapolis 85: 938:Plate 6–Bedrock Topography and Depth to Bedrock 666:Journal of Geophysical Research: Biogeosciences 8: 1321:(Map). The Loppet Foundation. Archived from 512:The Prudential office west of Brownie Lake, 252:onto iron oxide minerals that form at the 18: 1140: 1122: 1036:Minnesota Department of Natural Resources 972:Geology of Minnesota: A Centennial Volume 685: 368:Minnesota Department of Natural Resources 246:Minnesota Pollution Control Agency (MPCA) 569: 755:"Theodore Wirth Regional Park History" 1288:Minneapolis Park and Recreation Board 1213: 1211: 970:. In Sims, P.K.; Morey, G.B. (eds.). 961: 959: 762:Minneapolis Park and Recreation Board 725: 599: 597: 595: 593: 552:trail in Minneapolis, built in 2016. 194:Minneapolis Park and Recreation Board 127:Minneapolis Park and Recreation Board 7: 874: 872: 843: 841: 839: 837: 749: 747: 745: 743: 741: 723: 721: 719: 717: 715: 713: 711: 709: 707: 705: 655: 653: 651: 649: 647: 645: 635: 633: 591: 589: 587: 585: 583: 581: 579: 577: 575: 573: 51: 1251:Grand Rounds National Scenic Byway 546:Grand Rounds National Scenic Byway 230:Minnehaha Creek Watershed District 14: 1218:Kumar, Kavita (August 13, 2015). 968:"Quaternary History of Minnesota" 792:Science of the Total Environment 452:; natural gas). A population of 168:, and within the city limits of 50: 43: 27: 882:Plate 4–Quaternary Stratigraphy 812:10.1016/j.scitotenv.2008.07.037 771:from the original on 2015-04-26 734:(PhD). University of Minnesota. 150: 142: 134: 228:. Brownie Lake is part of the 1: 606:"Water resources report 2015" 513: 441:Brownie Lake is inhabited by 68: 879:Berthold, Angela J. (2018). 848:Berthold, Angela J. (2018). 522:Prudential Insurance Company 935:Reltzer, Andrew J. (2018). 907:Reltzer, Andrew J. (2018). 358:Brownie Lake at shore level 1380: 166:Hennepin County, Minnesota 1166:Journal of Paleolimnology 1124:10.3389/fmicb.2021.695260 1111:Frontiers in Microbiology 966:Wright, H.E. Jr. (1972). 851:Plate 3–Surficial Geology 505:likely occurred by 1925. 38: 26: 139:18 acres (0.073 km) 910:Plate 2–Bedrock Geology 536:Recreational facilities 155:49.9 feet (15.2 m) 517: 359: 147:20.3 feet (6.2 m) 1004:10.1130/2011.0024(20) 511: 357: 108:44.96750°N 93.32444°W 1359:Parks in Minneapolis 1354:Lakes of Minneapolis 1328:on November 10, 2019 1042:on December 10, 2019 730:Swain, E.B. (1984). 687:10.1029/2018JG004587 334:Lake Superior region 329:Laurentide Ice Sheet 325:Last Glacial Maximum 1284:"Brownie Lake Park" 1230:on October 23, 2019 1178:1996JPall..15..129T 804:2008ScTEn.406..131N 678:2018JGRG..123.3403L 618:on October 23, 2019 480:Theodore Wirth Park 316:glacial sediments. 113:44.96750; -93.32444 104: /  1294:on October 6, 2019 1186:10.1007/BF00196776 530:Target Corporation 526:Target Corporation 518: 360: 204:Brownie Lake is a 1076:10.1111/gbi.12365 1013:978-0-8137-0024-3 672:(10): 3403–3422. 524:. It was sold to 491:Lake of the Isles 400:tiger muskellunge 363:forest/woodland. 262:Mississippi River 222:Lake of the Isles 182:Lake of the Isles 159: 158: 16:Lake in Minnesota 1371: 1364:Meromictic lakes 1338: 1337: 1335: 1333: 1327: 1320: 1310: 1304: 1303: 1301: 1299: 1290:. Archived from 1280: 1274: 1273: 1271: 1269: 1263: 1256: 1246: 1240: 1239: 1237: 1235: 1226:. Archived from 1215: 1206: 1205: 1161: 1155: 1154: 1144: 1126: 1102: 1096: 1095: 1058: 1052: 1051: 1049: 1047: 1038:. Archived from 1024: 1018: 1017: 990: 984: 983: 963: 954: 953: 951: 949: 943: 932: 926: 925: 923: 921: 915: 904: 898: 897: 895: 893: 887: 876: 867: 866: 864: 862: 856: 845: 832: 831: 787: 781: 780: 778: 776: 770: 759: 751: 736: 735: 727: 700: 699: 689: 657: 640: 637: 628: 627: 625: 623: 617: 610: 601: 542:Cedar Lake Trail 515: 456:bacteria at the 119: 118: 116: 115: 114: 109: 105: 102: 101: 100: 97: 87: 54: 53: 47: 31: 19: 1379: 1378: 1374: 1373: 1372: 1370: 1369: 1368: 1344: 1343: 1342: 1341: 1331: 1329: 1325: 1318: 1312: 1311: 1307: 1297: 1295: 1282: 1281: 1277: 1267: 1265: 1264:on July 6, 2017 1261: 1254: 1248: 1247: 1243: 1233: 1231: 1217: 1216: 1209: 1163: 1162: 1158: 1104: 1103: 1099: 1060: 1059: 1055: 1045: 1043: 1026: 1025: 1021: 1014: 992: 991: 987: 965: 964: 957: 947: 945: 941: 934: 933: 929: 919: 917: 913: 906: 905: 901: 891: 889: 885: 878: 877: 870: 860: 858: 854: 847: 846: 835: 789: 788: 784: 774: 772: 768: 757: 753: 752: 739: 729: 728: 703: 659: 658: 643: 638: 631: 621: 619: 615: 608: 603: 602: 571: 566: 538: 475: 451: 408:yellow bullhead 388:largemouth bass 352: 350:Natural history 306: 206:meromictic lake 202: 176:(Brownie Lake, 124:Managing agency 112: 110: 106: 103: 98: 95: 93: 91: 90: 65: 64: 63: 62: 61: 60: 59: 55: 34: 17: 12: 11: 5: 1377: 1375: 1367: 1366: 1361: 1356: 1346: 1345: 1340: 1339: 1305: 1275: 1241: 1207: 1172:(2): 129–132. 1156: 1097: 1053: 1028:"Brownie Lake" 1019: 1012: 985: 955: 927: 899: 868: 833: 798:(1): 131–144. 782: 737: 701: 641: 629: 568: 567: 565: 562: 537: 534: 474: 471: 454:methanotrophic 449: 428:fathead minnow 372:black bullhead 351: 348: 305: 302: 294:stratification 290:Interstate 394 267:St. Louis Park 210:temperate zone 201: 198: 174:Chain of Lakes 157: 156: 153: 149: 148: 145: 141: 140: 137: 133: 132: 129: 128: 125: 121: 120: 88: 82: 81: 71: 67: 66: 57: 56: 49: 48: 42: 41: 40: 39: 36: 35: 32: 24: 23: 15: 13: 10: 9: 6: 4: 3: 2: 1376: 1365: 1362: 1360: 1357: 1355: 1352: 1351: 1349: 1324: 1317: 1316: 1309: 1306: 1293: 1289: 1285: 1279: 1276: 1260: 1253: 1252: 1245: 1242: 1229: 1225: 1221: 1214: 1212: 1208: 1203: 1199: 1195: 1191: 1187: 1183: 1179: 1175: 1171: 1167: 1160: 1157: 1152: 1148: 1143: 1138: 1134: 1130: 1125: 1120: 1116: 1112: 1108: 1101: 1098: 1093: 1089: 1085: 1081: 1077: 1073: 1069: 1065: 1057: 1054: 1041: 1037: 1033: 1029: 1023: 1020: 1015: 1009: 1005: 1001: 997: 989: 986: 981: 977: 973: 969: 962: 960: 956: 940: 939: 931: 928: 912: 911: 903: 900: 884: 883: 875: 873: 869: 853: 852: 844: 842: 840: 838: 834: 829: 825: 821: 817: 813: 809: 805: 801: 797: 793: 786: 783: 767: 763: 756: 750: 748: 746: 744: 742: 738: 733: 726: 724: 722: 720: 718: 716: 714: 712: 710: 708: 706: 702: 697: 693: 688: 683: 679: 675: 671: 667: 663: 656: 654: 652: 650: 648: 646: 642: 636: 634: 630: 614: 607: 600: 598: 596: 594: 592: 590: 588: 586: 584: 582: 580: 578: 576: 574: 570: 563: 561: 557: 553: 549: 547: 543: 535: 533: 531: 527: 523: 510: 506: 504: 500: 494: 492: 487: 483: 481: 472: 470: 467: 463: 459: 455: 447: 444: 439: 435: 433: 432:golden shiner 429: 425: 421: 417: 413: 409: 405: 401: 397: 393: 392:northern pike 389: 385: 381: 377: 376:black crappie 373: 369: 364: 356: 349: 347: 344: 342: 341:interglacials 337: 335: 330: 326: 321: 319: 315: 311: 303: 301: 299: 295: 291: 287: 283: 279: 275: 270: 268: 263: 259: 258:Bassett Creek 255: 251: 247: 242: 239: 233: 231: 227: 223: 219: 215: 211: 207: 199: 197: 195: 191: 187: 183: 179: 175: 171: 167: 164:is a lake in 163: 154: 146: 144:Average depth 138: 130: 126: 122: 117: 89: 83: 79: 75: 72: 46: 37: 30: 25: 20: 1332:November 10, 1330:. 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Retrieved 613:the original 558: 554: 550: 539: 519: 495: 488: 484: 476: 465: 443:methanogenic 440: 436: 424:white sucker 412:yellow perch 365: 361: 345: 338: 322: 307: 272:Doubling of 271: 243: 234: 226:Bde Maka Ska 203: 190:Lake Harriet 186:Bde Maka Ska 162:Brownie Lake 161: 160: 136:Surface area 58:Brownie Lake 22:Brownie Lake 1268:November 9, 1234:October 23, 775:October 23, 622:November 4, 482:, in 1907. 466:"Candidatus 420:common carp 418:(dogfish), 396:pumpkinseed 314:Pleistocene 298:Twin Cities 170:Minneapolis 111: / 86:Coordinates 74:Minneapolis 1348:Categories 1064:Geobiology 1032:LakeFinder 564:References 458:chemocline 254:chemocline 250:adsorption 238:Prudential 214:chemocline 178:Cedar Lake 152:Max. depth 99:93°19′28″W 96:44°58′03″N 1202:129509299 1194:1573-0417 1133:1664-302X 1084:1472-4669 820:0048-9697 696:2169-8961 528:in 1994. 503:meromixis 382:, hybrid 310:Paleozoic 282:equimolar 200:Hydrology 78:Minnesota 1151:34305861 1117:: 1768. 1092:31592570 828:18762321 766:Archived 460:consume 380:bluegill 318:Holocene 278:chloride 196:(MPRB). 70:Location 1174:Bibcode 1142:8302410 800:Bibcode 674:Bibcode 473:History 462:methane 446:archaea 404:walleye 384:sunfish 327:by the 304:Geology 1200:  1192:  1149:  1139:  1131:  1090:  1082:  1010:  980:800396 978:  826:  818:  694:  430:, and 416:bowfin 286:halite 274:sodium 218:anoxic 188:, and 1326:(PDF) 1319:(PDF) 1262:(PDF) 1255:(PDF) 1198:S2CID 942:(PDF) 914:(PDF) 886:(PDF) 855:(PDF) 769:(PDF) 758:(PDF) 616:(PDF) 609:(PDF) 516:1960s 499:fetch 1334:2019 1300:2019 1270:2019 1236:2019 1190:ISSN 1147:PMID 1129:ISSN 1088:PMID 1080:ISSN 1048:2019 1008:ISBN 976:OCLC 950:2019 922:2019 894:2019 863:2018 824:PMID 816:ISSN 777:2019 692:ISSN 624:2019 366:The 276:and 224:and 80:, US 1182:doi 1137:PMC 1119:doi 1072:doi 1000:doi 808:doi 796:406 682:doi 670:123 296:in 1350:: 1286:. 1222:. 1210:^ 1196:. 1188:. 1180:. 1170:15 1168:. 1145:. 1135:. 1127:. 1115:12 1113:. 1109:. 1086:. 1078:. 1068:18 1066:. 1034:. 1030:. 1006:. 958:^ 871:^ 836:^ 822:. 814:. 806:. 794:. 764:. 760:. 740:^ 704:^ 690:. 680:. 668:. 664:. 644:^ 632:^ 572:^ 548:. 514:c. 434:. 426:, 422:, 414:, 410:, 406:, 402:, 398:, 394:, 390:, 386:, 378:, 374:, 336:. 269:. 232:. 184:, 180:, 76:, 1336:. 1302:. 1272:. 1238:. 1204:. 1184:: 1176:: 1153:. 1121:: 1094:. 1074:: 1050:. 1016:. 1002:: 982:. 952:. 924:. 896:. 865:. 830:. 810:: 802:: 779:. 698:. 684:: 676:: 626:. 450:4

Index


Brownie Lake is located in Minnesota
Minneapolis
Minnesota
44°58′03″N 93°19′28″W / 44.96750°N 93.32444°W / 44.96750; -93.32444
Hennepin County, Minnesota
Minneapolis
Chain of Lakes
Cedar Lake
Lake of the Isles
Bde Maka Ska
Lake Harriet
Minneapolis Park and Recreation Board
meromictic lake
temperate zone
chemocline
anoxic
Lake of the Isles
Bde Maka Ska
Minnehaha Creek Watershed District
Prudential
Minnesota Pollution Control Agency (MPCA)
adsorption
chemocline
Bassett Creek
Mississippi River
St. Louis Park
sodium
chloride
equimolar

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