#----------------------------------------------------------------------- # World Data Center for Paleoclimatology, Boulder # and # NOAA Paleoclimatology Program #----------------------------------------------------------------------- # NOTE: Please cite Publication, and Online_Resource and date accessed when using these data. If there is no publication information, please cite Investigators, Title, and Online_Resource and date accessed. # # Online_Resource: hurricane.ncdc.noaa.gov/pls/paleox/f?p=519:1:::::P1_STUDY_ID:15894 # Online_Resource: ftp://ftp.ncdc.noaa.gov/pub/data/paleo/speleothem/africa/wassenburg2013-mg-sr.txt # # Original_Source_URL: # # Description/Documentation lines begin with # # Data lines have no # # # Archive: speleothem #-------------------- # Contribution_Date # Date: 2013-11-27 #-------------------- # Title # Study_Name: Moroccan speleothem and treering records suggest a variable positive state of the North Atlantic Oscillation during the Medieval Warm Period #-------------------- # Investigators # Investigators: Wassenburg,J.A.;Immenhauser,A.;Richter,D.K.;Niedermayr,A.;Riechelmann, S.;Fietzke,J.;Scholz,D.;Jochum,K.P.;Fohlmeister,J.;Schröder-Ritzrau,A.;Sabaoui,A.;Riechelmann,D.F.C.;Schneider,L.;Esper,J.; #-------------------- # Description_and_Notes # Keywords: trace metals, drought, hydrology, precipitation, North Atlantic Oscillation, Medieval Climate Anomaly, speleothem, prior calcite precipitation, aragonite, trace elements #-------------------- # Publication # Authors: J.A. Wassenburg, A. Immenhauser,D. K. Richter, A. Niedermayr, S. Riechelmann, J. Fietzke, D. Scholz, K. P. Jochum, J. Fohlmeister, A. Schröder-Ritzrau, A.Sabaoui,D.F.C. Riechelmann,L.Schneider,J.Esper # Published_Date_or_Year: 2013 # Published_Title: Moroccan speleothem and tree ring records suggest a variable positive state of the North Atlantic Oscillation during the Medieval Warm Period. # Journal_Name: Earth and Planetary Science Letters # Volume: 375 # Edition: # Issue: # Pages: 291-302 # Report_Number: # DOI: http://dx.doi.org/10.1016/j.epsl.2013.05.048 # Publication_Place: # Publisher: # ISBN: # Online_Resource: http://www.blogs.uni-mainz.de/fb09climatology/files/2012/03/Wassenburg_2013_EPSL.pdf # Other_Reference_Details: # Full_Citation: # Abstract: We present a magnesium (Mg) and strontium (Sr) record from an aragonitic speleothem(Grotte de Piste, Morocco, 34‬ºN; 04ºW) providing a reconstruction of effective rainfall from 619-1962 AD. The corresponding drip site was monitored over two years for drip water Mg/Ca and Sr/Ca ratios. Results show evidence for prior aragonite precipitation, which can explain negative correlations between speleothem Mg and Sr concentrations. The data shown here have important climate implications concerning the evolution of the North Atlantic Oscillation (NAO). A comparison of the stalagmite data from Grotte de Piste with an updated tree ring based drought reconstruction from Morocco and other NAO related proxy records confirms that the medieval warm period (MWP) was dominated by NAO+ conditions. The stalagmite record and multiple proxy records from the Iberian Peninsula, however, suggest that considerable rainfall variability occurred during the MWP. This implies that the NAO has been more variable during the MWP than formerly suggested. #------------------ # Funding_Agency # Funding_Agency_Name: # Grant: #------------------ # Site_Information # Site_Name: Grotte de Piste # Location: Africa # Region: Middle Atlas # Country: Morocco # Northernmost_Latitude: 34.0 # Southernmost_Latitude: 34.0 # Easternmost_Longitude: -4.0 # Westernmost_Longitude: -4.0 # Elevation: 1260 #------------------ # Data_Collection # Collection_Name: GP5 # Earliest_Year: 748 # Most_Recent_Year: 1962 # Time_Unit: calendar years AD # Core_Length: 78 cm # Notes: #------------------ # Species: #------------------ # Chronology: #---------------- # Variables # Short_name What,Material,Error,Units, Seasonality,Archive,Details,Method,Data_type age_AD Age,,,calendar years AD,,,,,N Mg25aragoniteppm Mg25,aragonite,,ppm,,speleothem,,,N Sr86aragoniteppm Sr26,aragonite,,ppm,,speleothem,,,N #---------------- # Data # Missing_Values: # # Data line format - tab-delimited text, variable short name as header age_AD Mg25aragoniteppm Sr86aragoniteppm 1962 64 419 1957 83 435 1953 58 410 1948 123 439 1944 76 409 1940 83 389 1936 74 394 1931 71 411 1927 82 321 1925 85 381 1922 70 454 1918 77 473 1915 91 397 1911 78 438 1907 112 441 1903 90 398 1898 93 355 1893 125 382 1888 114 436 1884 96 453 1879 84 387 1875 88 384 1870 73 449 1866 79 480 1861 69 487 1856 65 420 1852 99 434 1847 78 427 1842 83 424 1838 118 366 1833 76 399 1828 74 448 1823 79 437 1819 78 470 1814 82 454 1809 88 512 1804 70 479 1799 54 445 1795 60 459 1790 92 454 1784 61 476 1780 62 501 1775 58 479 1770 60 504 1765 104 520 1760 85 438 1755 45 514 1750 90 418 1745 85 416 1743 74 476 1734 66 479 1732 59 470 1728 43 465 1722 84 389 1717 60 456 1713 43 441 1708 78 407 1705 72 458 1700 86 476 1695 85 512 1689 57 474 1684 73 443 1679 68 444 1673 85 482 1668 66 461 1663 77 421 1658 78 411 1652 76 441 1647 123 474 1642 51 469 1637 93 440 1632 65 442 1626 76 453 1621 80 442 1616 84 466 1611 103 450 1606 91 489 1602 87 472 1596 82 443 1591 78 420 1585 115 430 1580 91 468 1575 72 457 1570 91 444 1564 59 402 1559 119 395 1554 158 477 1549 119 449 1544 126 477 1538 122 436 1533 99 451 1528 88 403 1523 104 442 1518 94 458 1512 66 465 1507 85 454 1502 97 494 1497 97 461 1493 114 527 1488 111 506 1483 99 511 1477 110 448 1472 105 466 1467 97 464 1465 110 404 1460 71 454 1454 105 443 1449 114 489 1444 129 446 1439 106 464 1433 138 379 1428 103 420 1423 90 348 1418 110 423 1412 95 397 1407 117 374 1402 98 342 1397 114 401 1391 424 1386 137 373 1381 82 365 1375 103 337 1370 95 347 1365 100 402 1359 60 424 1353 56 478 1348 76 443 1342 61 461 1336 63 460 1330 49 453 1325 55 432 1319 56 428 1313 76 363 1308 95 395 1302 87 403 1297 71 438 1292 80 417 1286 84 342 1281 101 331 1275 97 339 1269 99 305 1263 115 307 1257 164 392 1252 101 367 1246 129 390 1241 107 385 1236 102 397 1229 105 358 1222 93 382 1209 90 354 1195 123 349 1183 83 360 1174 122 347 1166 88 375 1157 116 387 1149 109 380 1147 79 359 1140 75 384 1133 54 413 1125 90 450 1119 62 418 1112 77 434 1105 99 412 1099 88 458 1092 93 431 1085 98 377 1078 126 356 1073 137 475 1064 102 409 1057 90 388 1050 87 339 1043 109 330 1037 92 355 1030 92 386 1023 95 425 1016 73 422 1009 87 417 1003 114 295 997 74 325 989 65 449 984 90 394 982 66 477 978 77 389 972 56 428 961 70 452 943 70 452 897 95 413 882 77 397 854 57 405 837 60 423 834 50 415 815 51 513 799 48 514 788 62 536 767 46 535 748 61 501