Longxi, China 1000 Year Decadal Hydrological Indices ----------------------------------------------------------------------- World Data Center for Paleoclimatology, Boulder and NOAA Paleoclimatology Program ----------------------------------------------------------------------- NOTE: PLEASE CITE ORIGINAL REFERENCE WHEN USING THIS DATA!!!!! NAME OF DATA SET: Longxi, China 1000 Year Decadal Hydrological Indices LAST UPDATE: 10/2009 (Original receipt by WDC Paleo) CONTRIBUTOR: Liangcheng Tan, Institute of Earth Environment, Chinese Academy of Sciences. IGBP PAGES/WDCA CONTRIBUTION SERIES NUMBER: 2009-115 WDC PALEO CONTRIBUTION SERIES CITATION: Tan, L., et al. 2009. Longxi, China 1000 Year Decadal Hydrological Indices. IGBP PAGES/World Data Center for Paleoclimatology Data Contribution Series # 2009-115. NOAA/NCDC Paleoclimatology Program, Boulder CO, USA. ORIGINAL REFERENCE: Tan, L., Y. Cai, L. Yi, Z. An, and L. Ai. 2008. Precipitation variations of Longxi, northeast margin of Tibetan Plateau since AD 960 and their relationship with solar activity. Climate of the Past, Vol. 4, pp. 19-28. www.clim-past.net/4/19/2008/ ABSTRACT: The precipitation variations of Longxi area, northeast margin of the Tibetan Plateau since AD 960 are reconstructed from Chinese historical documentary records. These records show that since AD 960, the precipitation of Longxi decreased and reached the lowest level at the end of the 17th and the 18th centuries. After this period, the precipitation gradually increased. The three short wet periods of Longxi in the last millennium were: from the end of the 10th century to the early years of the 11th century, from the end of the 12th century to the early years of the 13th century and during the first half of the 20th century. The precipitation variations coincide well with variations of the Northern Hemisphere temperature and the atmospheric 14C concentration, as well as the averaged 10Be concentration and the reconstructed solar modulation record which show that solar activity may be an important driving force of the precipitation variations of Longxi on multi-decadal to centennial scales during the last millennium. Solar activity controls the motion of the north edge of the Asian summer monsoon by affecting the Asia summer monsoon intensity, the East Asian winter monsoon intensity and the locations of westerlies, thus further dominating precipitation variations of Longxi. Synchronous variations of Longxi precipitation and Northern Hemisphere temperature may also be ascribed to the same control of solar activity. ADDITIONAL REFERENCE: Zhang, D.E. 1983. The method for reconstruction of climate series for the last 500 years and its reliability, in: Collected Papers of Meteorological Science and Technology (4), edited by: Central Meteorological Bureau, Meteorological Press, Beijing, China, 17-26. (in Chinese). GEOGRAPHIC REGION: Central China PERIOD OF RECORD: 960 - 1990 AD FUNDING SOURCES: National Basic Research Program of China grant 2004CB720206; National Science Foundation of China grants 40403001 and 40531003; State Key Laboratory of Loess and Quaternary Geology of China grant SKLLQG 0615. DESCRIPTION: Drought/Flood (D/F) indices for Longxi, China, based on Chinese historical documentary records. Longxi is located on the northeast margin of the Tibetan Plateau, ~35šN, 104.6šE. Drought/Flood (D/F) indices are a 5-level classification system based on the time of occurrence, the affected area and the degree of drought and flood in spring, summer or autumn (Zhang, 1983). Detailed standards are as follows: (1) Wet, heavy rain lasting a long time or occurring over a large area; (2) Mildly wet, sustaining rain in spring or autumn that does not cause disaster or heavy rain break just in a local area; (3) Fitting climate that gives rise to a big harvest year, or describes as rainy (dry) in spring but dry (rainy) in autumn; (4) Mildly dry, seasonal drought within a month that does not cause disaster or severe drought just in a local area; (5) Dry, severe drought that lasts several months, spans two seasons or occurs in a large area (Zhang, 1983). See Tan et al. (2008) for modifications to the traditional 5-level classification system used in this study, and for decadal averaging methodology. DATA: Longxi Drought/Flood (D/F) indices Column 1: YearAD Column 2: 10-year Average D/F index YearAD 10-year Average D/F index 960 0 970 0 980 990 -1 1000 -0.5 1010 -1 1020 0.5 1030 0.5 1040 1050 -0.5 1060 0 1070 0.5 1080 0.5 1090 -0.5 1100 0 1110 1120 0 1130 0.5 1140 1 1150 -1 1160 0.5 1170 0.5 1180 0.5 1190 -1 1200 -0.5 1210 0.5 1220 -0.5 1230 1240 0.5 1250 1260 0.5 1270 0 1280 1 1290 1 1300 0.5 1310 -1 1320 0 1330 0.5 1340 1350 0.5 1360 1370 0.5 1380 1390 0.5 1400 1 1410 -1 1420 1 1430 1 1440 0 1450 0.5 1460 1 1470 -1 1480 1 1490 0.5 1500 0.5 1510 1 1520 1 1530 0 1540 1 1550 -1 1560 0.5 1570 -0.5 1580 1 1590 0.5 1600 0.5 1610 0.5 1620 1 1630 1 1640 1 1650 -0.5 1660 1 1670 -0.5 1680 0.5 1690 1 1700 1 1710 1 1720 1 1730 1 1740 1 1750 1 1760 0.5 1770 1 1780 0 1790 1 1800 1 1810 1 1820 0 1830 1 1840 1 1850 0.5 1860 1 1870 1 1880 -1 1890 1 1900 0.5 1910 1 1920 1 1930 -1 1940 -1 1950 1 1960 0 1970 -0.5 1980 0 1990 1